Page 1 ___________________ SIWAREX WP251 Introduction ___________________ Safety notes ___________________ Weighing systems Description ___________________ Application planning Electronic Weighing System SIWAREX WP251 ___________________ Mounting ___________________ Connection Manual ___________________ Commissioning Scale parameters and ___________________ functions ___________________ Errors and messages ___________________ Command lists Communication with...
Page 2 Note the following: WARNING Siemens products may only be used for the applications described in the catalog and in the relevant technical documentation. If products and components from other manufacturers are used, these must be recommended or approved by Siemens. Proper transport, storage, installation, assembly, commissioning, operation and maintenance are required to ensure that the products operate safely and without any problems.
Page 3: Table Of Contents
Mounting on the SIMATIC S7-1200 ..................27 Connection ............................29 Overview ..........................29 24 V connection ........................30 Connecting the load cells ......................30 Shield connection ........................31 Connection of digital outputs (4 x DQ) ..................34 SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 4 Reading out the saved scale logs ..................55 Scale parameters and functions ......................57 Parameters and functions ...................... 57 Weighing steps........................58 8.2.1 Introduction ..........................58 8.2.2 Operating mode NAWI (non-automatic weighing instrument) - Filling ........58 SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 5 Overview ..........................79 8.5.2 Calibration digits 0, 1, 2 (calculated) ..................80 DR 5 Tare / zero memory ....................... 80 8.6.1 Overview ..........................80 8.6.2 Effective tare weight - from specification 1, 2 or 3 ..............81 SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 6 RS485 character parity ......................102 8.13.5 RS485 number of data bits ....................102 8.13.6 RS485 number of stop bits ....................103 8.13.7 RS485 Modbus address ...................... 103 8.13.8 Decimal place for Siebert indicator ..................103 SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 7 Type of controller ........................123 8.23.4 Control factor of proportional controller ................123 8.23.5 Maximum corrective action ....................123 8.23.6 Controller deadband - upper limit ..................124 8.23.7 Controller deadband - lower limit ..................124 SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 8 Current status digital input DI.0, DI.1, DI.2 and DI.3 ............144 8.28.8 DIP switch 1 and 2 ....................... 144 8.28.9 Current status digital output DQ.0, DQ.1, DQ.2 and DQ.3 ..........144 8.28.10 Refresh counter........................144 8.28.11 Current load cell signal in mV ....................145 SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 9 Data and command errors - Additional information .............. 172 9.6.5 Messages by LEDs on the module ..................177 Command lists ............................ 179 10.1 Overview ..........................179 10.2 Command lists ........................179 10.3 Command groups of the SIWAREX WP251 ................. 184 SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 10 Index ..............................219 Tables Table 6- 1 Connection of the 24 V supply ..................... 30 Table 6- 2 Load cell connections on the module ................... 31 Table 6- 3 Connection of the digital outputs ....................35 SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 11 Assignment of data record 31 ....................141 Table 8- 29 Assignment of data record 32 ....................146 Table 8- 30 Assignment of data record 34 ....................150 Table 8- 31 Assignment of data record 35 ....................151 SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 12 Scale commands ........................183 Table 10- 6 Scale commands ........................183 Table 10- 7 Command groups of the SIWAREX WP251 ................184 Table 11- 1 Memory requirements of the function block ................185 Table 11- 2 Statuses/errors when working with the function block ............... 192 Table 11- 3 Command mailbox 1: Highest priority ..................
Page 13 Image 3-1 System overview .......................... 20 Image 4-1 SIWATOOL overview ........................22 Image 4-2 SIWAREX WP251 in stand-alone operation ................23 Image 6-1 SIWAREX WP251 connection areas ................... 29 Image 6-2 Shielding in the screw gland ......................31 Image 6-3 Installation of the shield connection element (example) ..............
Page 14 CMD command mailboxes ......................189 Image 11-7 s_IO_DATA..........................191 Image 13-1 Current ranges for signal level according to Namur recommendation NE43 ......205 Image A-1 Electrostatic voltages which an operator can be subjected to ........... 216 SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 15: Introduction
Introduction Purpose of the manual This manual contains all the information required for assembling installing, wiring and commissioning the SIWAREX WP251 electronic weighing system. Basic knowledge required This manual requires basic knowledge of weighing technology. When used in the SIMATIC S7-1200, basic knowledge of the SIMATIC S7-1200 automation system and the TIA Portal are required.
Page 16 ● Information about field service, repairs, spare parts and lots more under "Services". Additional Support Please contact your local Siemens representative and offices if you have any questions about the products described in this manual and do not find the right answers.
Page 17: Safety Notes
Security messages Siemens provides automation and drive products with industrial security functions that support the secure operation of plants or machines. They are an important component in a holistic industrial security concept. With this in mind, our products undergo continuous development.
Page 18 Safety notes 2.2 Security messages machine. Products used from other manufacturers should also be taken into account here. You will find further information under: (http://www.siemens.de/industrialsecurity). SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 19: Description
Description Product overview SIWAREX WP251 is a versatile and flexible weighing module that can be used for operation as a non-automatic weighing instrument. The electronic weighing system can be used in SIMATIC S7-1200 and uses all features of a modern automation system, such as integrated communication, operator control and monitoring, the diagnostic system as well as the configuration tools in the TIA Portal.
Page 20: Scope Of Delivery
The product package consists only of the SIWAREX WP251 weighing module. Note We recommend that you use the SIWAREX WP251 configuration package for configuring the SIWAREX WP251 electronic weighing system. The configuration package is not included in the product package of the module.
Page 21: Application Planning
CPU and its cycle time. The CPU can be used to manage recipes and material parameters. These parameters and the desired set point are then transferred to WP251 via a function block, and the dosing process is started. SIWAREX WP251 automatically optimizes the shut-off points, generates statistics, and logs every dosing operation in the internal log memory, which is also accessible from the CPU and can be read by the CPU.
Page 22: Parameter Assignment With A Simatic Panel
4.2.2 Parameter assignment with a SIMATIC Panel All module parameters can be assigned and the module put into operation using a SIMATIC HMI Panel connected to the S7-1200 CPU and the SIWAREX WP251 function and data blocks. SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 23: Parameter Assignment By Means Of The Modbus Interface
The "Ready-for-Use" example application is included in the scope of delivery of the configuration package and is also available from Siemens Online Support. In addition to the function block, it contains a complete TIA HMI project for operation and commissioning of scales, which the user can edit in TIA.
Page 24 Application planning 4.2 Parameter assignment options A detailed description of the assignment of the holding registers can be found in section → Scale parameters and functions (Page 57). SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 25: Mounting
● Interferences transported by communication cables ● Interferences having an effect via process cables ● Interferences entering the system via the power supply and/or protective ground Interferences can impair the fault-free functioning of the electronic weighing system. SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 26: Coupling Mechanisms
● Always use shielded data cables. Always connect both ends of the data cable shielding to ground on a large area. ● Keep unshielded cable ends as short as possible. ● Always use metal/metalized connector housings only for shielded data cables. SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 27: Mounting On The Simatic S7-1200
The load cells, power supply and serial interfaces are connected via the screw-type connectors. Use of the WP251 in the SIMATIC TIA Portal is described in detail in section 11 of this manual: → Integration in SIMATIC S7-1200 (Page 185) SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 28 Mounting 5.3 Mounting on the SIMATIC S7-1200 SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 29: Connection
Analog output connection Ethernet interface connection ③ ⑧ Load cell connection Calibration bridge connection ④ ⑨ RS485 interface connection Mounting terminals for the calibration protection plate ⑤ Digital output connection Image 6-1 SIWAREX WP251 connection areas SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 30: Connection
(the load cells must be connected in parallel). If the distance of a load cell to the SIWAREX WP251 or the junction box is greater than the available length of the load cell connection cable, use the SIWAREX EB extension box.
Page 31: Shield Connection
We recommended that you use the cables listed in chapter → Accessory (Page 213). 4. The shield must be connected to ground directly in the vicinity of the SIWAREX WP251. The maximum distance between the SIWAREX WP251 and the load cell applies when using the recommended cables.
Page 32: Image 6-3 Installation Of The Shield Connection Element (Example)
Connection 6.4 Shield connection Image 6-3 Installation of the shield connection element (example) SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 33: Image 6-4 Connection Of Strain Gauge Load Cell With 4-Wire System
Connection 6.4 Shield connection Image 6-4 Connection of strain gauge load cell with 4-wire system SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 34: Connection Of Digital Outputs (4 X Dq)
This may damage parts of the system. Do not create a connection with the digital outputs before you know the assignment of the digital outputs. SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 35: Connection Of Digital Inputs (4 X Di)
2M. Table 6- 4 Connection of the digital inputs Labeling Function DI.0 Digital input 0 DI.1 Digital input 1 DI.2 Digital input 2 DI.3 Digital input 3 DI.2M Reference ground potential of the digital inputs SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 36: Connection Of The Analog Output (1 X Aq)
RS485 data line - for feeding in of bus signal If a SIWAREX WP251 module forms the termination of an RS485 network, insert a wire jumper between the D+‘ and T+ terminals and between the D-‘ and T- terminals for termination of the bus network.
Page 37: Connection Of Siebert Display Via Rs485
Image 6-6 Connection of Siebert display S102 The RS485 interface in DR 13 of the SIWAREX WP251 is set as follows: ● Baud rate: 9 600 bit/s ● Character parity: Even ● Number of data bits: 8 ●...
Page 38: Connection Of The Ethernet Interface
3 can no longer be edited and various service and calibration commands can no longer be executed. Table 6- 8 Activation of write protection Labeling Function P terminal for activation of write protection PR terminal for activation of write protection SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 39: Attachment Of Calibration Protection Plate
6.12 Attachment of calibration protection plate To operate SIWAREX WP251 as a calibratable electronic weighing system, the load cell connections must be protected against manipulation. To achieve this, mount the calibration protection plate included in the calibration set as shown in the following figure. Then attach the calibration protection plate to the associated terminals (see Overview (Page 29)).
Page 40 Connection 6.12 Attachment of calibration protection plate SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 41: Commissioning
Modbus TCP/IP/Modbus RTU interface. "SIWATOOL" is a component of the WP251 configuration package (see Accessories). The function block and the "Ready-for-use" example application can be downloaded for free from Siemens Online Support. Factory setting of the mode selector The module contains two DIP switches to the left of the Ethernet connector (accessible through the ventilation opening).
Page 42: Automatic Quick Calibration With Siwatool
"Stand-alone" operation (DIP 2 at bottom position) can be useful even when the module is connected to an S7-1200 CPU because SIWAREX WP251 then remains fully functional and can continue dosing and filling if the CPU stops. In other words, it can continue to be operated, for example, via a directly connected HMI device using a Modbus connection, a connected PC or the digital inputs.
Page 43: Activate Service Mode
Firstly, service mode is activated; the standard parameters are subsequently loaded using the "Load standard parameters (12)" command. The parameters must then be read from the SIWAREX in SIWATOOL using "Communication → Receive all data". SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 44: Input Of Required Parameters
3 mechanical support points. ● Characteristic value of a load cell in mV/V, or the mean value of the characteristic values if there is more than one load cell ● Rated load of a load cell SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 45: Complete Automatic Calibration
4. Remove the reference weight from the scale. → Check that the display is "0 kg" again. Should these steps not yield the expected results, the electrical connection of the load cells and the scale mechanics must be checked. SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 46: Quick Calibration With Calibration Weights And Siwatool
Therefore the complete data record must initially be received for every change to parameters within it. The desired parameter can then be edited, and the data record returned. If the data record is not received, the danger exists that SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 47: Calibration
→ The calibration weight 1 should be displayed in the weight display. ● Optional: Place the previously defined "Calibration weight 2" on the scale ● Activate the "Set Calibration Point 2" (62) command. → The calibration weight 2 should be displayed in the weight display. SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 48: Receive All Data
You can use the SIWATOOL program to commission the scale independently of the automation system. The program is included in the scope of delivery of the configuration package (see Accessories). Install the SIWATOOL program on your PC for commissioning. SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 49: Windows And Functions Of Siwatool
The desired parameter can then be edited, and the data record returned. If the data record is not received, the danger exists that different offline parameters will be sent to the scale and overwrite previously active and intentionally defined parameters. SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 50: Offline Parameter Assignment
The assignment of a new IP address to a SIWAREX module is necessary if several SIWAREX modules are present in one network. The following ports are used by SIWAREX: ● SIWATOOL port: 23006 ● MODBUS TCP/IP port: 502 ● TFTP for firmware download port: 69 SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 51: Entering A Known Siwarex Ip Address
(Page 213). Install the program "Primary Setup Tool". When started, the program can determine the Siemens devices present in the network. The MAC (Media Access Control) address can be read on the front of the SIWAREX module. Every device has an MAC address which is unique worldwide.
Page 52: Entering Parameters With Siwatool
Excel and then processed further. The commands for starting and stopping are present in the "Trace commands" group (yellow memory card icon) in SIWATOOL. All important measured values, messages and changes in status are recorded. SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 53: Firmware Update
TFTP protocol. In such cases, the respective protective mechanism must be temporarily deactivated for the duration of the update, or an alternative PC used. The latest firmware version can be found at Siemens Industry Online Support (https://support.industry.siemens.com/cs/document/109476228). Note...
Page 54 Following the transfer, the SIWAREX module must be switched off and then on again. This activates the new firmware. If the firmware file was not successfully uploaded, the following FAQ will assist you with troubleshooting: (https://support.industry.siemens.com/cs/document/109476228) SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 55: Reading Out The Saved Scale Logs
You can read the logs with SIWATOOL using the "Logs" button A new window is opened, and all logs present in the weighing module are read out using "Refresh". You can subsequently save these in EXCEL or .csv format. SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 56 Commissioning 7.5 Service with the SIWATOOL program SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 57: Scale Parameters And Functions
WP251 then switches the coarse and fine signal and doses the desired quantity to the scale or removes it from the scale (filling or removal mode). SIWAREX WP251 can also empty the scale, if required. An emptying signal is then switched. This signal is either switched based on a fixed time (emptying time) or when Limit 3 (emptying limit) is fallen below.
Page 58: Weighing Steps
3. WP251 performs zero setting or tares (based on settings in DR 25) 4. Coarse/fine dosing phase starts 5. If configured and necessary, post-dosing occurs (DR 22) 6. WP251 jumps to "Stopped" state and waits for "Continue" command (1141) by the operator SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 59: Operating Mode Nawi (Non-Automatic Weighing Instrument) - Removal
(e.g. valves). After the set point is reached, WP251 automatically logs the dosed weight in the log memory, performs a tolerance check (only in checked cycles), corrects the shut-off points of the dosing signals if necessary (only in checked cycles) and SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 60: Operating Mode Aci (Automatic Catchweighing Instruments) - Filling
3. WP251 performs zero setting or tares (based on setting in DR 25) (weighing step 1) 4. Coarse/fine dosing phase starts (weighing step 2) 5. If configured and necessary, post-dosing occurs (DR 22) (weighing step 3) 6. Dosing result is automatically checked and logged (weighing step 4) SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 61: Operating Mode Aci (Automatic Catchweighing Instruments) - Removal
9. WP251 jumps to weighing step 0 and waits for further commands or jumps directly back to step 1 (continuous operation). DR 3 Calibration parameters 8.3.1 Overview The calibration parameters (DR 3) must be checked and changed, if necessary, for each scale. SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 62: Table 8- 1 Assignment Of Data Record 3
5: "lb" (pound) 6: "T" (=short tons) 7: "TL" (= long tons) Gross identifier (Page 66) 0: "B" USHORT 1012 1: "G" Code for regulations 0: None USHORT 1013 (Page 67) 1: OIML Reserve Reserve USHORT 1014 SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 63 Automatic zero adjust- 0: Deactivated BOOL 1032 ment (Page 68) 1: Activated Subtractive / additive tare 0: Subtractive BOOL 1032 device (Page 69) 1: Additive Weight simulation allowed 0: Not enabled BOOL 1032 (Page 69) 1: Enabled SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 64 [in % of maximum weighing range] Standstill 1 - range Standstill range 1, FLOAT 9,999,9 1044 (Page 72) specification in numer- ical increments Standstill 1 - time Standstill time 1 (ms) TIME 1000 10,000 1046 (Page 72) SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 65 (Page 75) cureDisplay 0: No 1: Yes SecureDisplay interface 0: SecureDisplay USHORT 1067 (Page 75) directly at WP251 Ethernet port 1: SecureDisplay at S7-1200 Ethernet port String header version String header version UBYTE 1068 SecureDisplay SecureDisplay SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 66: Scale Name
8.3.4 Gross identifier The gross identifier specifies the letter, B (for brutto) or G (for gross) to be used in the display for a gross weight value. SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 67: Code For Regulations
If a scale has been modified and the current content is known, this value can be entered and set as the calibration weight. A larger calibration weight 1 is then specified and set. SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 68: Scale Interval
8.3.12 Automatic zero adjustment If necessary, the scales can be set semi-automatically to zero by the user by means of the "Zeroing" command. SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 69: Subtractive / Additive Tare Device
"TEST". 8.3.15 Automatic zero tracking The parameter defines whether the zero tracking (if activated) is to be active only outside the automatic dosing cycle (only in weighing step 0) or also inside the dosing cycle. SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 70: Maximum Tare Load
4% of the weighing range. Example: Maximum weight = 100 kg Negative zeroing limit (semi-automatic) = 3% → Up to 3 kg (3% of 100 kg) can be set to zero by the zero setting function. SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 71: Maximum Positive Zero Setting Limit (Semi-Automatically)
In the following situations, Standstill 1 must be present in order to perform the corresponding action: Tare, Zero setting In the following situations, Standstill 2 must be present in order to perform the corresponding action: Tolerance check, Logging SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 72: Standstill 1 - Range
The maximum waiting time for standstill 1 applies when a command is performed that is dependent on the occurrence of standstill 1. A technology message is generated if the command could not be executed during the waiting time because there is no standstill. SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 73: Standstill 2 - Range
2 is made. If the settling time is active, this is indicated in the AWI Status of the scale by a corresponding bit. SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 74: Frequency Low Pass Filter 1
10 ms. When n = 10, for example, 10 values are used to calculate the average. Every 10 ms, the oldest value is omitted from the calculation and the newest value is included in the calculation (running average). SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 75: Weighing Operating Mode
The parameter defines the line frequency of the power supply grid. A selection between 50 Hz and 60 Hz can be made. By making the correct setting, interferences caused by the power supply grid can be better suppressed. SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 76: Calibration
Load cell characteristic value Digits (approx.) at nominal load 1 mV/V 1 000 000 2 mV/V 2 000 000 4 mV/V 4 000 000 The diagram below illustrates the relationship between calibration digits and the calibration weight. SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 77: Calibration Digits And Calibration Weight
The same applies when you change a weighing module. Note Two working points are usually sufficient for determining the scales' characteristic curve. An additional working point is only required for non-linear systems. SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 78: Automatic Calibration
During initial commissioning with automatic calibration, the module must be reset using the "Load factory settings" or "Load standard parameters" command. SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 79: Dr 4 Output Of Calculated Calibration Digits
Version identifi- Current data rec- USHORT 65635 1203 ord version infor- mation Calibration Calibration digits 0 LONG 200000 1600000 1204 digits 0, 1, 2 (calculated): (calculated) calibration digits (Page 80) calculated by 'automatic calibra- tion' SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 80: Calibration Digits 0, 1, 2 (Calculated)
Modbus (bytes) write Register protec- tion Data record Contains no. of the USHORT 1214 number data record Length Data record length USHORT 1215 information Application Information about USHORT 1216 which application the DR belongs to SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 81: Effective Tare Weight - From Specification 1, 2 Or 3
The corresponding command (see command 1011) applies the current gross weight as the active tare weight. From this point on, the activated tare weight is factored into the weight calculations. The "Delete tare" command deactivates the active tare weight. SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 82: Zero By Power-On (Value When Switching On)
Table 8- 4 Assignment of data record 6 Variable Note Type Length Default Min. Max. Modbus (bytes) Register Data record number Contains no. of the USHORT 1234 data record Length Data record length USHORT 1235 information SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 83 1242 num- range+ Limit value 1 ON, limit Switch-off point for FLOAT maxi- maxi- 1244 value 2 ON, limit Limit 1 value 1 OFF, limit num- num- value 2 OFF (Page 84) range range SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 84: Limit Value 1 On, Limit Value 2 On, Limit Value 1 Off, Limit Value 2 Off
This allows both minimum and maximum value violation monitoring with hysteresis. A delay time for switch-on and switch-off can also be specified. Either the current net weight or the current gross weight can be selected as the reference value for limits 1 and SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 85: Switch-On Delay Limit 3 (Empty)
"Limit reference" setting Unlike Limit 1 and Limit 2, Limit 3 always references the gross weight of the scale. SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 86: Dr 7 Process Interfaces
(Page 90) edge 32760...32767: Transition for steps 0 to 7 (positive edge) 32769 … 65527 Com- mand (command code+32768) is triggered at a negative edge 65528...65535: Transition for steps 0 to 7 (negative edge) SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 87 32760...32767: Transition for steps 0 to 7 (positive edge) 32769 … 65527 Com- mand (command code+32768) is triggered at a negative edge 65528...65535: Transition for steps 0 to 7 (negative edge) SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 88 CPU STOP (Page 92) Substitute value for DQ 2 1314.14 following fault or SIMATIC CPU STOP Substitute value for DQ 3 1314.13 following fault or SIMATIC CPU STOP Bit 4 Reserve 1314.12 Bit 5 Reserve 1314.11 SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 89 OutDis signal is ena- or SIMATIC bled (in mA) STOP (Page 94) Trace record- 1: 10 ms USHORT 1000 1324 ing cycle 10: 100 ms (Page 94) 100: 1 s 1 000: 10 s SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 90: Assignment Of Digital Input Di.0, Di.1, Di.2, Di.3
Command code is triggered at a positive edge (0 → 1 transition) 32760...32767 Transition for steps 0 to 7 (positive edge) 32769…65527 Command code +32768: Command is triggered at a negative edge (1 → 0 transi- tion) 65528...65535 Transition for steps 0 to 7 (negative edge) SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 91: Input Filtering (Hardware Setting)
For a single component scale, three of the outputs are typically linked directly to the "Coarse signal" (function code 41), "Fine signal" (function code 42), and "Empty" (function code 43) status bits in order to directly control the corresponding dosing elements or the associated relays of SIWAREX WP251. See also Errors and messages (Page 163)
Page 92: Response Of Digital Outputs To Faults Or Simatic Stop
Value of DQ 2 following fault 0 (default) NOTICE Risk to the plant If an output is set following a fault (operating error), this can pose a risk for the plant. Ensure that the parameters are correctly set. SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 93: Analog Output Range
0 mA or 4 mA, depending on the setting. The value can be greater or less than the end value. 8.8.11 End value for the analog output This parameter defines the end value of the scaling of the analog output and thus corresponds to 20 mA. SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 94: Output Value Following Fault Or Simatic Stop
Trace storage method This parameter is used to specify the response of the trace memory. Value Response Trace recording runs as circulating memory Trace recording is stopped when memory is full and a technology message is output. SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 95: Dr 8 Date And Time
Current data record version USHORT 65635 1347 information Order No. - head- Maximum and current string UBYTE[2] 16,16 1348 length for the order number Order No. Order number of the module CHAR[16] 16 "7MH4960 1349 7MH .. -6AA01" SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 96: Dr 10 Load Cell Parameters
Table 8- 10 Assignment of data record 10 Variable Note Type Length Default Min. Max. Modbus (bytes) registers Data record number Contains no. of the data USHORT 1400 record Length Data record length infor- USHORT 1401 mation SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 97: Number Of Support Points
If anchor points are used in addition to load cells, the number of support points is equal to the total number of load cells and fixed support points. Example A tank is mounted on three load cells → Number of mechanical support points = 3 SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 98: Load Cell Characteristic Value
The load cell characteristic value is required to correctly interpret the output voltage from the load cell. When Siemens WL series load cells are used, the exact characteristic value can be read from label on the cell. If the exact characteristic value of the utilized cell(s) is not available, a rounded value can also be specified.
Page 99: Device Mac Address
8.12.4 IP address The IP address can be changed using the Primary Setup Tool, SIWATOOL or the SIMATIC function block (see section "IP address for SIWAREX (page 52)"). The factory state IP address is 192.168.0.21. SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 100: Subnet Mask
Assign the subnet mask of your network. 8.12.6 Gateway If a gateway is used between the SIWAREX WP251 and the communication partner, enter the gateway address here. If a gateway is not present, enter the IP address of the SIWAREX module.
Page 101 Decimal Decimal place for Siebert SHORT 1566 place for display Siebert indicator (Page 103) MODBUS Delay time for response with USHORT 1567 RTU frame MODBUS RTU in ms delay (RS485) Reserve 3 Reserve FLOAT 1568 SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 102: Rs485 Protocol
This parameter defines the character parity for the RS485 interface. Value Character parity 0 (default) Even 8.13.5 RS485 number of data bits This parameter defines the number of data bits for the RS485 interface. Value Data bits 1 (de- fault) SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 103: Rs485 Number Of Stop Bits
Gross process weight FLOAT Gross/net process weight FLOAT Tare process weight FLOAT Net weight x10 FLOAT Status of analog output, digital out- LONG puts and inputs (see table) NAWI Status bits (default) USHORT Refresh counter UINT SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 104: Dr 15 Preset Tare
Information about which application the DR USHORT 1580 belongs to Version Current data record version information USHORT 65635 1581 identifier Preset tare Tare preset 1 FLOAT Depends 1582 weight 1 (Page 105) specifi- cation in DR 3 SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 105: Preset Tare Weight 1
Version Current data record version USHORT 65635 1601 identifier information Weight simu- Weight value specification FLOAT Max. 1602 lation speci- (only relevant if simulation weigh- fication mode is enabled) (Page 106) range SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 106: Weight Simulation Specification
The set value must be within the range of the analog output scaling in DR 7: Start value for the analog output (Page 93) < Set value < End value for the analog output (Page 93). SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 107: Dr18 Control Digital Outputs
(only applies if output is assigned function code 64, see DR 7) Specification for digital output 3=1 → DQ.3 1620.13 output active (only applies if output is assigned function code 64, see DR 7) Reserve Reserve 1620.12 SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 108: Specification For Digital Outputs Dq.0, Dq.1, Dq.2, Dq.3
As an alternative to setting transitions via software, the digital inputs of WP251 can also be configured with transitions for the individual weighing steps. Thus, a 24 V DC signal can be used to disable or enable individual weighing steps. SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 109: Dr 20 Single Set Point
8.19.1 Overview The set point amount to be dosed is specified in the data record. Procedure ● Specify the desired set point ● Transfer DR 20 to SIWAREX WP251 Table 8- 19 Assignment of data record 20 Variable Note Type Length Max.
Page 110: Dr 21 Total Set Point
20th container, and DR 30 sets the status bit "Total set point reached". If continuous operation is switched off in the interim or an active dosing is aborted, the counter is restarted. SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 111: Dr 22 Tolerance Parameters
Contains no. of the USHORT 1644 number data record Length Data record length USHORT 1645 information Application Information on appli- USHORT 1646 cation to which DR belongs Version identifi- Current data record USHORT 65535 1647 version information SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 112 TH1 (Page 116) band 1 (inner) Tolerance limit Low limit tolerance FLOAT 1654 TL1 (Page 116) band 1 (inner) Tolerance limit Low limit tolerance FLOAT 1656 TL2 (Page 116) band 2 (outer) Reserve Reserve USHORT 1658 SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 113 If there is still a tol- erance error, the scale goes to Stop state again. This is repeated until the tolerance error is eliminated (e.g. by manually adding or removing material). SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 114 Number of not Number of cycles USHORT 1664 controlled during which WP251 weighings does not perform a (Page 117) tolerance check in AWI continuous operation (active only when the previ- ous dosing was completed with 'GOOD' tolerance). SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 115: Parameter Relation
In general, the currently valid tolerance limits in data record 31 are output in the weight unit. When function codes 2 and 3 are selected, the entered tolerance limits TH2, TH1, TL1 and TL2 are ignored because the limits are calculated automatically based on the OIML Recommendation. SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 116: Tolerance Limit Th2
This parameter defines how long (ms) the fine signal is switched on when post-dosing in pulsing mode was set as the response to a TL1 violation in the tolerance check (function code 4). The pause time of pulsing mode corresponds to the settling time before standstill 2 (DR 3). SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 117: Number Of Not Controlled Weighings
Dosings (with tolerance check) of "GOOD" class are included following "Dosing completed" in the calculated statistics. Dosings (with tolerance check) of "BAD" class are not included following "Dosing completed" in the calculated statistics. SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 118: Dr 23 Material Parameters
Shut-off correction value for com- FLOAT 1686 correction pensation of influences such as weight overpressure or underpressure (Page 121) when dosing Reserve Reserve FLOAT 1688 Reserve Reserve FLOAT 1690 Reserve Reserve USHORT 1692 Reserve Reserve USHORT 1693 SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 119: Parameter Relation
In the example, this means specifically that the coarse and final signal are switched at the start of the dosing. When 93 kg is reached, the coarse signal is shut off. When 98 kg is reached, the fine signal is shut off. The following graphic explains the relationship. SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 120: Blocking Time Coarse Signal
This parameter defines a timer that starts when the coarse signal is shut off. As long as the timer is active, WP251 does not perform a check to determine whether the fine shut-off point has been reached. SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 121: Shut-Off Correction Weight
0: No controller USHORT 1699 ler (Page 123) 1: Proportional controller Control factor of Control factor of proportional con- FLOAT > 0 1700 proportional troller controller (Page 123) (%) for proportional controller Reserve Reserve FLOAT 1702 SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 122 DR 31 and simultaneously adopted auto- matically in DR 23 Thus DR 23 is always updated with the currently adjusted shut-off points. Reserve Reserve USHORT 1719 Reserve Reserve USHORT 1720 Reserve Reserve USHORT 1721 SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 123: Parameter Relation
Depending on the "Parameter relation" setting (DR 24), the value must be specified and interpreted as a percentage of the set point (DR 20) or as an absolute weight value. SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 124: Controller Deadband - Upper Limit
1 (default) The dosing signals are shut off according to net process value 2 (with filter from DR Note Standstill 1 and 2 always reference the gross process value 1 with filter settings from DR 3. SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 125: Frequency Low Pass Filter 2
Order no. low pass filter 2 The order number of the filter defines the effect of damping. The values 2, 4, 6, 8 and 10 can be specified. The higher the selected order number, the stronger the filter acts. SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 126: Depth Average Filter
USHORT 65535 1725 information Maximum single set Specification in weight unit FLOAT 1726 point (Page 128) "Coarse" set value % value referenced to 0/4-20 FLOAT > Fine 1728 for analogue output signal (Page 128) value SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 127 1, if test stop command was received Bit 2: Dosing goes to check stop after step 2, … Bit n: Dosing goes to check stop after step n, … Reserve Reserve ULONG 1744 Reserve Reserve USHORT 1746 SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 128: Maximum Single Set Point
Example "Coarse" set value for analogue output (DR 25) = 75% Range analog output (DR 7) = 0-20 mA → When the "Coarse signal" is activated, 15 mA is output at the analog output. SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 129: Fine" Set Value For Analogue Output
The setting is made in milliseconds (ms). If the dosing cycle has not yet finished after expiration of the timer, WP251 outputs a corresponding technology message that has no further effect on the running dosing cycle. The message serves only as information for the operator. SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 130: Weighing Start Options
● Dosing is started (single dosing or continuous operation) → After weighing step 1 is complete, WP251 jumps to "Stopped" state. The "Check stop active" bit is set in the AWI Status, and the "Check stop follows" bit is reset. SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 131: Automatic Emptying
The message is purely informative. The parameter setting is made in milliseconds (ms). SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 132: Dr 28 Additional Strings For Log
1: String 1 2: String 2 3: String 3 4 String 4 Reserve Reserve USHORT 1809 Reserve Reserve FLOAT 1810 8.25.2 Strings 1, 2, 3 and 4 Four user-definable text strings with 16 characters each are available. SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 133: Sting Selection For Automatic Logging
The weight at switch-on is out- B16_3 1816 ting on not possible side the permissible initial zero- ing range 2004 Trace memory Cyclic trace recording canceled B16_4 1816 full because memory is full B16_5 1816 SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 134 2114 Maximum correc- Maximum corrective action B17_5 1817 tive action exceeded (defined in DR 24) was ex- ceeded 2115 Log error Error while reading a log entry B17_6 1817 (refresh DS 46 with Request ID = 0) SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 135: Dr 30 Process State
"Integration in SIMATIC") and can thus be directly used in the PLC program. At the Modbus end, the parameters and status information from DR 30 is always current and the registers can therefore be read immediately. SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 136: Table 8- 27 Assignment Of Data Record 30
Reserve B16_12 3004 Reserve Reserve B16_13 3004 Reserve Reserve B16_14 3004 Reserve Reserve B16_15 3004 Reserve Reserve B16_0 3005 Reserve Reserve B16_1 3005 Reserve Reserve B16_2 3005 Reserve Reserve B16_3 3005 Reserve Reserve B16_4 3005 SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 137 Dosing has been stopped B16_13 3006 stopped Check stop active Dosing in check stop B16_14 3006 Check stop follows Check stop command is- B16_15 3006 sued, check stop will occur at next check stop point SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 138 3010 process values (Page 140) Gross, net and tare Tare weight (process value) FLOAT 3012 process values (Page 140) Gross, net and tare Gross/Net weight rounded FLOAT 3014 weights (Page 140) according to DR 3 SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 139 (Page 141) Current weighing Dosing step the WP251 is USHORT 3047 step (Page 141) currently in Reserve Reserve LONG 3048 Reserve Reserve USHORT 3050 Reserve Reserve USHORT 3051 Reserve Reserve LONG 3052 Reserve Reserve FLOAT 3054 SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 140: Gross, Net And Tare Process Values
In gravimetric filling mode, the actual weight determined by the tolerance check in checked cycles is summed. For cycles without tolerance check, the set point set in DR 20 is included in the calculated sums. SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 141: Youngest Protocol-Id
Version identifier Current data record version USHORT 65535 3303 information Unfiltered digit value Unfiltered digit value LONG 3304 (Page 143) Digits filtered by F1 Filtered value after filter 1 LONG 3306 (Page 143) (DR 3) SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 142 3314 output DQ.0, DQ.1, DQ.2 and DQ.3 (Page 144) Reserve Reserve B16_12 3314 Reserve Reserve B16_13 3314 Reserve Reserve B16_14 3314 Reserve Reserve B16_15 3314 Refresh counter Refresh counter USHORT 0x0000 0xFFFF 3315 (Page 144) SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 143: Unfiltered Digit Value
The filtered digit value is the internal measured value after filtering with filters defined in DR 8.28.4 Filtered digit value 2 The filtered digit value is the internal measured value after filtering with filters defined in DR SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 144: Current Analog Output (Ma)
Measured values are re-calculated every 10 ms in the SIWAREX module. A counter is incremented by 1 each time. Once the counter reaches the value 65536, it starts again from zero. The counter can be used as a time stamp for data record DR 30. SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 145: Current Load Cell Signal In Mv
For operation with a SIMATIC CPU, the use of DR 32 is unnecessary because the error information is made available to the CPU or HMI automatically in the data block via the I/O area of the WP251. SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 146: Table 8- 29 Assignment Of Data Record 32
2002 Trace error The configured cycle for the trace Bit_2 3505 recording cannot be processed: Reading is active or buffer is full; recording is stopped SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 147 2113 Maximum emptying Emptying monitoring time expired Bit_4 3506 time exceeded 2114 Maximum corrective Maximum corrective action was Bit_5 3506 action exceeded exceeded 2115 Log error Error while reading a log entry Bit_6 3506 SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 148 See "Additional information" for Bit_11 3507 parameter DR 3 more information 7054 Parameter error DR 5 See "Additional information" for Bit_12 3507 more information 7055 Parameter error DR 6 See "Additional information" for Bit_13 3507 more information SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 149 Additional information on data and USHORT 3509 data and command errors command errors Reserve Reserve USHORT 3510 Reserve Reserve USHORT 3511 Reserve Reserve USHORT 3512 Reserve Reserve USHORT 3513 Reserve Reserve USHORT 3514 Reserve Reserve USHORT 3515 SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 150: Operating Errors, Technology Messages, Data/Command Errors
119) 8.30.2 Content of the display string The following values can be displayed: Standard display (gross/net weight) (via command 710) From DR 30 High-resolution gross/net weight (via command 701 for 5 seconds) From DR 30 SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 151: Dr 35 Securedisplay Data
Contains no. of the data record USHORT Length Data record length information USHORT Application Information about which applica- USHORT tion the DR belongs to Version identifier Current data record version in- USHORT 65635 formation SecureDisplayData UBYTE[32] SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 152: Dr 38 Min/Max Pointer
Contains no. of the USHORT 4069 data record Length Data record length USHORT 4070 information Application Information about USHORT 4071 which application the DR belongs to Version identifier Current data record USHORT 65635 4072 version information SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 153 No. of checks class Number of checked FLOAT 4097 TL2 (% of no. of weighings below TL2 weighings) as a percentage of the total number of weighings SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 154: Dr 41/42 Data Memory
Default Min. Max. Modbus (bytes) registers Data record num- Contains no. of the data USHORT 4123 record Length Data record length infor- USHORT 4124 mation Application Information about which USHORT 4125 application the DR belongs SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 155: Dr 45 Protocol Request
Table 8- 36 Assignment of data record 45 Variable Remark Type Length Default Min. Max. Modbus (bytes) register Data record num- Contains no. of the data USHORT 4300 record Length Data record length infor- USHORT 4301 mation SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 156: Protocol Id To Be Read
If the protocol ID to be read in DR 45 is 0, data record DR 46 is automatically written with the last created log. Thus, after a dosing, DR 46 can be read directly into the PLC for further processing without having to request the last log beforehand. SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 157: Dr 46 Protocol Content
String header for check- UBYTE[2] 4371 checksum Checksum Checksum of selected CHAR[4] "0000" 4372 String header for String header for date UBYTE[2] 10,10 4374 date Date, time Date CHAR[10] 10 "2012-03- 4375 (Page 159) 31" SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 158: Oldest Report Id
The 46 bytes of the log have the following structure: Designation Data type Length Gross/Net UBYTE SEMICOLON UBYTE G/N weight calibratable UBYTE SEMICOLON UBYTE Weight unit UBYTE SEMICOLON UBYTE Tare sign UBYTE SEMICOLON UBYTE Tare UBYTE SEMICOLON UBYTE SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 159: Date, Time
4402 String header for selected String header UBYTE[2] 4406 logbook ID ID of the selected logbook ID of the selected logbook CHAR[8] "0" 99999999 4407 entry entry String header for device String header UBYTE[2] 4411 SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 160: Dr 48 Date And Time 2 (For Modbus)
Current data record version USHORT 65635 4503 identifier information Year Year USHORT 2012 2012 2010 4504 Month Month USHORT 4505 Day in month USHORT 4506 Hour Hour USHORT 4507 Minute Minute USHORT 4508 Second Second USHORT 4509 SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 161 Scale parameters and functions 8.38 DR 48 date and time 2 (for Modbus) Variable Note Type Length Default Min. Max. Modbus (bytes) registers Millisecond Millisecond USHORT 4510 Day of the Day of the week USHORT 4511 week SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 162 Scale parameters and functions 8.38 DR 48 date and time 2 (for Modbus) SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 163: Errors And Messages
A command error occurs when the module cannot execute the issued command in its current operating state. For most data/command errors, SIWAREX WP251 outputs additional information for the error. This includes further details about the error and is described in detail in the error list in this section.
Page 164: Evaluating Errors/Messages With The Help Of Siwatool
Contact SIWAREX Support if the error recurs. Reserve Reserve Reserve 1003 Checksum error (parame- 1003 The checksum of the parameters no longer matches. Remedy: Load factory ters) settings. Contact SIWAREX Support if the error recurs. SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 165: Technology Messages
Check the scale mechanics for strong fluctuations / disturbances that prevent standstill. 2002 Trace error 2002 The set recording rate for trace function cannot be processed. Set a slower recording rate (section "Trace recording cycle (page 91)") SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 166 2113 Maximum emptying time 2113 The maximum emptying time configured in DR 25 was exceeded exceeded during emptying. Remedy: Check the scale mechanics (for possible soiling). Adjust the maximum emptying time in DR 25, if necessary. SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 167: Data And Command Errors
Commands from the Service commands group could not be exe- error cuted. Additional information contains details. 4510 , because service mode is not active 4511 , because write protection active 4507 , because dosing active 4512 , because enable missing SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 168 , because fine weight, trailing weight and set point are incompati- 4546 , because dosing would cause overfilling 4547 , because configured emptying implausible 4548 , because no check stop points defined 4549 , because scale is already empty SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 169 , because resolution not permitted 4613 , because OIML and 3000d requirements violated 7054 Parameter error DR 5 7054 Additional information indicates an implausible parameter in DR 5 Parameter Parameter ID of the affected parameter in DR 5 SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 170 Additional information indicates an implausible parameter in DR parameters DR 15 - DR 19 15 - DR 19 Parameter Parameter ID of the affected parameter in DR 15-19 4530 , because weight is outside the permissible tare weight range SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 171 Parameter ID of the affected parameter in DR 28 Reserve Reserve Reserve Reserve 7072 Parameter error DR 7072 Additional information indicates an implausible parameter in DR Parameter Parameter ID of the affected parameter in DR 45 Reserve SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 172: Data And Command Errors - Additional Information
3282 Grid frequency 3283 Tare maximum 3288 Max. waiting time for standstill 1 3316 Weight simulation allowed 3322 Weight unit 3323 Initial zeroing 3329 Initial zeroing if tared 3330 Negative zeroing limit (initial zeroing) 3332 SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 173 State of digital outputs on error or CPU-Stop 3144 State of analog output on error or CPU-Stop 3144 End value analog output 3152 Filter digital input 3162 Range analog output 3245 Source for analog output 3272 SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 174 Transition Step 1 3979 Transition Step 2 3980 Transition Step 3 3981 Transition Step 4 3982 Transition Step 5 3983 Transition Step 6 3984 Transition Step 7 3985 Single set point 2012 Total set point 3914 SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 175 Minimum automatic tare weight 2281 "Fine" set value for analogue output 2461 "Coarse" set value for analogue output 2462 Maximum weighing time 2518 Number of weighings without automatic taring/zero 2763 setting Maximum automatic tare weight 3917 String 1 SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 176 Errors and messages 9.6 Operating errors Parameter Data record Parameter ID String 2 String 3 String 4 Sting selection for automatic logging 2306 SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 177: Messages By Leds On The Module
Not used LED 12 Not used LED 13 Not used LED 14 Not used LED 15 Not used LED 16 Analog output active Analog output faulty Flashing Line 2 LED 1 LINK LAN connection exists SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 178 RS485 communication active LED 12 Not used LED 13 DQ.0 Digital output 0 active LED 14 DQ.1 Digital output 1 active LED 15 DQ.2 Digital output 2 active LED 16 DQ.3 Digital output 3 active SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 179: Command Lists
● by the Operator Panel via the controller to the SIWAREX module ● by the Operator Panel directly to the SIWAREX module ● by SIWATOOL directly to the SIWAREX module ● by the digital inputs after corresponding assignment in data record DR 7 SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 180: Table 10- 1 Service Commands
3 and 4 and is thus immediately active following execution of the com- mand. The scale must be empty when the command is executed. The accuracy of a scale that is automatically calibrated depends heavily on the mechanical setup! SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 181: Table 10- 2 Protocol Commands, Statistics, Logbook
Display standard gross/net weight display on the main display (DR 34) and the SecureDisplay. Display single set point Display currently set point setting from DR 20 on the main display (DR 34) and the SecureDisplay for 5 seconds. SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 182 Shows the SecureDisplay on the HMI with the small- est zoom factor (see DisplayCali.xml). Display serial number Display serial number of SIWAREX WP251 in the main display and the SecureDisplay for 5 seconds. Display Firmware Version Display firmware version and checksums of SIWAREX WP251 in the main display (serial number only) and the SecureDisplay for 5 seconds.
Page 183: Table 10- 5 Scale Commands
The command can be issued only in weighing step 0. The "Emptying signal" bit is then set to TRUE and a linked digital output, if any, is set. The command is used to clean the scale or to open it manually for ser- vice. SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 184: Command Groups Of The Siwarex Wp251
Command lists 10.3 Command groups of the SIWAREX WP251 1127 Manual emptying The command can be issued only in weighing step 0. The "Emptying signal" bit is then set to FALSE and a linked digital output, if any, is reset.
Page 185: Communication With Simatic S7-1200
11.1.1 General information A SIWAREX WP251 occupies 32 bytes each in the input and output I/O areas of the CPU. The maximum number of SIWAREX WP251 weighing modules is defined as follows: ● S7-1212 CPU → Up to a maximum of two WP251 weighing modules ●...
Page 186: Creating The Hardware Configuration
11.1 Integration in SIMATIC S7-1200 11.1.2 Creating the hardware configuration Starting with TIA Portal V14, the SIWAREX WP251 is integrated in the standard hardware profile as an S7-1200 technology module. For TIA Portal V13 SP1, an HSP can be downloaded for the integration.
Page 187: Image 11-3 Start Address Of The Module
Image 11-3 Start address of the module Image 11-4 Hardware identifier Diagnostic interrupts can be optionally enabled or deactivated in the module properties. SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 188: Calling Of Function Block
● Start address SIWAREX WP251: 68 (see → Creating the hardware configuration (Page 186)) ● HW ID SIWAREX WP251: 271 (see → Creating the hardware configuration (Page 186)) ● Instance data block number of SIWAREX WP251 function block: DB 251 The function block can be integrated at the desired position in the user program using drag and drop.
Page 189: Working With The Function Block
2 or 1 for processing of the respective command. Note Cyclic triggering of the CMD1 command mailbox makes it impossible to send commands in mailbox 2 or 3. SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 190 The new calibration weight is now present in the SIWAREX and can be used. Service mode for the module should subsequently be switched off again using command "2". This procedure for reading and writing data records is identical for all data records. SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 191: I/O Interface Of Function Block
Process value according to setting in data record 14 in DWORD format (default=NAWI Status bits according to data record 30) AWI Status AWI Status bits according to data record 30 OPERATION_ERRORS Operating errors according to the "Messages" section SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 192: Error Codes Of Function Block
Command was sent although StartUp is still TRUE bo_WrongFW Data record version does not match the firmware bo_InvalidCMD An invalid command code was sent bo_DataOperationError Synchronous data operation error has occurred bo_StartUp Startup synchronization of module running SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 193: Communication Via Modbus
Modbus RTU or the Ethernet interface with Modbus TCP/IP. It is possible to use both interfaces for the communication. Note The SIWAREX WP251 is intended for operation in secure (closed) networks and does not have any protection against unauthorized data traffic. The following chapters describe the specifications for handling communication. The following functions can be executed: ●...
Page 194: Data Record Concept
(Page 57) describes the data records, variables and functions, including the register addresses. The data records are always checked as complete data packets for plausibility. For this reason, you must follow a specific procedure to change individual parameters. SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 195: Command Mailboxes
If you wish to read the registers from the data records DR 3 to DR 29, you must first export these as a complete data record to the internal output buffer. All Modbus registers of the individual parameters can be found in chapter → Scale parameters and functions (Page 57). SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 196: Writing Registers
(from the area of data/operator errors). You can find all further command numbers in chapter → Command lists (Page 179). In addition, an online document is available for working with SIWAREX WP251 and Modbus → Modbus communication of WP251 (http://support.automation.siemens.com).
Page 197: Operation Requiring Official Calibration
The SIWAREX SecureDisplay software serves as the legal trade main display of the scale. The software must be installed on the HMI prior to the verification. You can find a complete description of the software installation in the "SIWAREX SecureDisplay" information in Siemens Industry Online Support at (https://support.industry.siemens.com/cs/ww/de/view/109477602). SIWAREX WP251...
Page 198: Parameterization Of The Scale
1 of 4" and on the following 4 pages. If the write protection of the calibration parameters is activated (jumper between the connection points P-PR), a "lock symbol" is displayed next to each protected parameter. You can use the "Calibration check" submenu during the verification. SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 199 Display last logbook entry SecureDisplay are retained in the logbook. It is not possible Display previous logbook entry to download the firmware following verification of the scale Display next logbook entry with the jumper for write protection inserted. SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 200: Checking Of Parameters Relevant To The Device
2. Check of the firmware ID of the SIWAREX WP251 evaluation electronics The firmware ID of the SIWAREX WP251 evaluation electronics must agree with the requirements in the EC type approval. The currently valid version can be called on the SecureDisplay.
Page 201 Only the software downloads for the legal trade display SecureDisplay are retained in the logbook. It is no longer possible to download the firmware for the SIWAREX WP251 evaluation electronics following verification of the scale with the jumper for write protection inserted.
Page 202 The telegram address (No. 01) must be set on the Siebert display S102. Checking is carried out in accordance with the specifications in the Instruction Manual "Siebert series S102 - digital displays for Siemens Siwarex". SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 203: Technical Specifications
Resolution • (d=e) Error percent- • age pi 0.5 µV/e Step voltage • Accuracy delivery state typ. 0.1% v.E. Sampling rate 100 Hz Input signal resolution ± 4 000 000 Measuring range ± 4 mV/V SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 204 Max. output current 24 mA Error signal (if configured (FW)) 22 mA Max. load 600 Ω Temperature coefficient range ≤ ± 25 ppm/K v. E. Temperature coefficient zero point typ. ± 0.3 μA/K Linearity error ≤ 0.05% SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 205 15 V DC at 2.5 mA Logical signal level 0 (max) 5 V DC at 1.0 mA Sampling rate (FW) 10 ms Filtering 0.2, 0.4, 0.8, 1.6, 3.2, 6.4 and 12.8 ms Electrical isolation 500 V DC SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 206: Table 13- 10 Technical Specifications
Cat-5e UTP cable • (unshielded) max. 100 m Cat-5e SF/UTP • cable (shielded) Dimensions and weights Table 13- 10 Technical specifications: Dimensions W x H x D 70 x 100 x 75 mm Weight 300 g SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 207: Electrical, Emc And Climatic Requirements
IEC 61010-1 IEC 61131-2; UL 508 CSA C22.2 No.142 Protection class IEC 61140 Module is operated with protective extra- low voltage. The protective conductor connection serves only a functional earth to dissi- pate interference currents SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 208: Table 13- 13 Requirements: Interference Emission In Industrial Area In Accordance With En 61000-6-4
0.15 ... 0.5 MHz: 53 dB (μA) … 43 dB (μA) Q • 40 dB (μA) – 30 dB (μA) M • 0.5 ... 30 MHz: 43 dB (μA) / 30 dB (μA) M • SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 209: Table 13- 14 Requirements: Interference Immunity In Industrial Area In Accordance With En 61000-6-2
0.15 to 80 MHz EN 61326 OIML R 76 Not applicable for shielded cables and symmetrical ports * An external protection element has to be installed to meet the requirement (e.g.: Blitzductor VT AD24V, Dehn&Söhne) SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 210: Table 13- 15 Operating Conditions In Accordance With Iec 60721
Implement appropriate measures (e.g.: use in 8MC cabinets) to prevent radio interference. Ambient conditions The use of SIWAREX WP251 is intended under the following conditions in SIMATIC S7- 1200. Additionally observe the operating conditions of the S7-1200 system. Table 13- 15 Operating conditions in accordance with IEC 60721...
Page 211: Approvals
For applications in hazardous areas, read the safety information in the document "Product information "Use of SIWAREX modules in a Zone 2 Hazardous Area". (https://support.industry.siemens.com/cs/?lc=en-DE)"! Note The current approvals for SIWAREX WP251 can be found on the module rating plate. → CE approvals → cULus approval → Ex approval...
Page 212 Technical specifications 13.3 Approvals SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 213: Accessory
This contains the SIMATIC S7 block for operation with SIMATIC S7-1200 and a project for a KTP 700 Basic Key Touch Panel. Manuals in several languages • SIWAREX WP251 manual in various languages Free download from the Internet at: SIWAREX WP251 manuals (http://support.automa...
Page 214 Ex interface (Ex-I), for fixed laying Occasional bending is possible, • blue PVC insulating sheath, approx. 10.8 mm outer diameter For ambient temperature -20 to +70 °C • DIN rail grounding terminals for load cell cable 6ES5728-8MA11 SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 215: Esd Guidelines
Anyone who is not connected to the electrical potential of their surroundings can be electrostatically charged. The figure below shows the maximum electrostatic voltage which may build up on a person coming into contact with the materials indicated. These values correspond to IEC 801-2 specifications. SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 216 In this way, the discharged energy can not affect the sensitive devices. Discharge your body before you start taking any measurements on a module. Do so by touching grounded metallic parts. Always use grounded measuring instruments. SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 217: List Of Abbreviations
Preset tare (predefined tare weight with manual taring) Random access memory Programmable logic controller STEP 7 Programming device software for SIMATIC S7 Automatic weighing instrument Tare weight Technology module Touch Panel (SIMATIC) Universal Data Type (S7) Write protection Load cell(s) Numerical range SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 218 List of abbreviations B.1 List of abbreviations SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 219: Index
SIMATIC HMI panel, 22 Parameters of a data record, 57 Precautions, 216 Factory setting, 57 Function block, 185 Functions, 21 Quick calibration, 43 Guidelines ESD guidelines, 215 Safety information, 17 Scope of delivery, 20, 213 Service, 16 SIWAREX WP251 Manual, 12/2015, A5E37203357A...
Page 220 Index Shield connection element, 32 SIWATOOL V7, 42 Support, 16 System overview, 19 Technical specifications, 203 SIWAREX WP251 Manual, 12/2015, A5E37203357A...

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