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Siemens SITRANS LR120 Modbus Operating Instructions Manual
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Siemens SITRANS LR120 Modbus Operating Instructions Manual

Siemens SITRANS LR120 Modbus Operating Instructions Manual

Radar transmitters
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Edition
10/2022
Operating Instructions
SITRANS L
Radar Transmitters
SITRANS LR120 Modbus
https://www.siemens.com/processautomation

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Summary of Contents for Siemens SITRANS LR120 Modbus

  • Page 1 Edition 10/2022 Operating Instructions SITRANS L Radar Transmitters SITRANS LR120 Modbus https://www.siemens.com/processautomation...
  • Page 2 Preface Introduction Safety notes SITRANS L Description Radar Transmitters SITRANS LR120 Modbus Installing/mounting Connecting Operating Instructions Access protection Setup with smart device (Bluetooth) Operating Diagnostics and troubleshooting Service and maintenance Certificates and approvals Technical data and dimensions 10/2022 62709-76-01...
  • Page 3 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 4: Table Of Contents

    Connecting .......................... 19 Preparing the connection ..................19 Wiring plan ......................20 Access protection ........................ 21 Bluetooth radio interface ..................21 Protection of the parameterization ..............21 Setup with smart device (Bluetooth) .................. 23 SITRANS LR120 Modbus Operating Instructions, 10/2022, 62709-76-01, A5E49829030...
  • Page 5 Diagnosis data, device information (Input Register) ..........54 12.8 Function codes ....................54 12.9 Configuration of typical Modbus hosts ..............57 12.10 Dimensions ......................57 12.11 Licensing information for open source software ..........57 12.12 Trademark ......................57 SITRANS LR120 Modbus Operating Instructions, 10/2022, 62709-76-01, A5E49829030...

  • Page 6: Preface

    Take note of the Ex specific safety instructions for Ex applications. These instructions are attached as documents to each transmitter with Ex approval and are part of the operating instructions. Editing status: 2022-10-26 SITRANS LR120 Modbus Operating Instructions, 10/2022, 62709-76-01, A5E49829030...
  • Page 7 Preface SITRANS LR120 Modbus Operating Instructions, 10/2022, 62709-76-01, A5E49829030...

  • Page 8: Introduction

    Ex applications This symbol indicates special instructions for Ex applications. • List The dot set in front indicates a list with no implied sequence. SITRANS LR120 Modbus Operating Instructions, 10/2022, 62709-76-01, A5E49829030...
  • Page 9 Introduction 1.3 Symbols used Sequence of actions Numbers set in front indicate successive steps in a procedure. Disposal This symbol indicates special instructions for disposal. SITRANS LR120 Modbus Operating Instructions, 10/2022, 62709-76-01, A5E49829030...

  • Page 10: Safety Notes

    During work on and with the device, the required personal protective equipment must always be worn. Appropriate use SITRANS LR120 Modbus is a transmitter for continuous level measurement. You can find detailed information about the area of application in chapter " Product description".

  • Page 11: Radar Frequencies For Worldwide Use

    A Class 2 power supply unit has to be used for the installation in the USA and Canada. Security information Siemens provides products and solutions with industrial security functions that support the secure operation of plants, systems, machines and networks. To protect plants, systems, machines and networks against cyber threats, it is necessary to implement (and continuously maintain) a holistic, state-of-the-art industrial security concept.
  • Page 12 Use of product versions that are no longer supported, and failure to apply the latest updates may increase customer’s exposure to cyber threats. To stay informed about product updates, subscribe to the Siemens Industrial Security RSS Feed under: https://www.siemens.com/industrialsecurity...
  • Page 13 Safety notes 2.7 Security information SITRANS LR120 Modbus Operating Instructions, 10/2022, 62709-76-01, A5E49829030...

  • Page 14: Description

    Description Configuration Scope of delivery The scope of delivery encompasses: • SITRANS LR120 Modbus radar transmitter • Information sheet " Documents and software" with: • Transmitter serial number • QR code with link for direct scanning • Information sheet " Device Bluetooth and Parameter Access Codes" with: •...

  • Page 15: Principle Of Operation

    Layout of the nameplate (example) Principle of operation Application area SITRANS LR120 Modbus is a radar transmitter for non-contact, continuous level measurement. It is suitable for liquids and solids in practically all industries. SITRANS LR120 Modbus Operating Instructions, 10/2022, 62709-76-01, A5E49829030...

  • Page 16: Adjustment

    PE foam or PE foil is also used. Dispose of the packaging material via specialised recycling companies. Transport Transport must be carried out in due consideration of the notes on the transport packaging. Nonobservance of these instructions can cause damage to the device. SITRANS LR120 Modbus Operating Instructions, 10/2022, 62709-76-01, A5E49829030...

  • Page 17: Accessories

    Ambient conditions" • Relative moisture 20 … 85 % Accessories Mounting strap The mounting accessories are used for stable mounting of the device at the measuring point. The parts are available in various versions and sizes. SITRANS LR120 Modbus Operating Instructions, 10/2022, 62709-76-01, A5E49829030...

  • Page 18: Installing/Mounting

    The mounting of the device in the bracket is carried out via the supplied G1 counter nut of plastic. Take note of chapter " Mounting instructions" for the recommended distance to the wall. SITRANS LR120 Modbus Operating Instructions, 10/2022, 62709-76-01, A5E49829030...

  • Page 19: Mounting Instructions

    Mounting of the radar transmitter on round vessel tops Reference point The centre of the antenna lens is the beginning of the measuring range and at the same time the reference point for the min./max. adjustment, see following diagram: SITRANS LR120 Modbus Operating Instructions, 10/2022, 62709-76-01, A5E49829030...
  • Page 20 The antenna edge should protrude at least 5 mm (0.2 in) out of the nozzle. Figure 4.5 Recommended nozzle mounting of SITRANS LR120 Modbus If the reflective properties of the medium are good, you can mount SITRANS LR120 Modbus on nozzles longer than the antenna. The nozzle end should be smooth and burr-free, if possible also rounded.
  • Page 21 If there are agitators in the vessel, a auto false echo suppression should be carried out with the agitators in motion. This ensures that the interfering reflections from the agitators are saved with the blades in different positions. Figure 4.8 Agitators SITRANS LR120 Modbus Operating Instructions, 10/2022, 62709-76-01, A5E49829030...

  • Page 22: Measurement Setup - Flow

    • Rectangular flume thin-walled (ISO 1438) • Rectangular weir broad crown (ISO 3846) The value given takes into account the block distance. At smaller distances, the measuring accuracy is reduced, see " Technical data". SITRANS LR120 Modbus Operating Instructions, 10/2022, 62709-76-01, A5E49829030...
  • Page 23 The following examples serve as an overview for flow measurement. Rectangular overfall Overfall orifice (side view) Upstream water Tailwater Overfall orifice (view from tailwater) Figure 4.9 Flow measurement with rectangular flume: h = max. filling of the rectangular max. flume SITRANS LR120 Modbus Operating Instructions, 10/2022, 62709-76-01, A5E49829030...
  • Page 24 Installing/mounting 4.4 Measurement setup - Flow Khafagi-Venturi flume Position transmitter Venturi flume Figure 4.10 Flow measurement with Khafagi-Venturi flume: h = max. filling of the flume; B = max. tightest constriction in the flume SITRANS LR120 Modbus Operating Instructions, 10/2022, 62709-76-01, A5E49829030...
  • Page 25 Installing/mounting 4.4 Measurement setup - Flow SITRANS LR120 Modbus Operating Instructions, 10/2022, 62709-76-01, A5E49829030...

  • Page 26: Connecting

    In particular, make sure that the bus is terminated with suitable terminating resistors. Cable screening and grounding It is recommended to connect the cable screening to ground potential on the supply side. SITRANS LR120 Modbus Operating Instructions, 10/2022, 62709-76-01, A5E49829030...

  • Page 27: Wiring Plan

    Wire assignment in permanently connected connection cable Wire colour Function Polarity Brown Voltage supply Plus (+) Blue Voltage supply Minus (-) Black Modbus signal D+ Plus (+) White Modbus signal D- Minus (-) Shielding SITRANS LR120 Modbus Operating Instructions, 10/2022, 62709-76-01, A5E49829030...

  • Page 28: Access Protection

    The user PIN is also stored in the adjustment tool. However, unlike the Bluetooth PIN, it must be re-entered for each unlock. When using the adjustment app or EDD, the stored user PIN is then suggested to the user for unlocking. SITRANS LR120 Modbus Operating Instructions, 10/2022, 62709-76-01, A5E49829030...
  • Page 29 " Device Bluetooth and Parameter Access Codes". If this document is lost, the Device Access PUK can be retrieved from your personal contact person after legitimation. The storage and transmission of the user PIN is always encrypted (SHA 256 algorithm). SITRANS LR120 Modbus Operating Instructions, 10/2022, 62709-76-01, A5E49829030...

  • Page 30: Setup With Smart Device (Bluetooth)

    If an incorrect code is entered, the code can only be entered again after a delay time. This time gets longer after each incorrect entry. Connected After connection, the transmitter adjustment menu is displayed on the respective adjustment tool. SITRANS LR120 Modbus Operating Instructions, 10/2022, 62709-76-01, A5E49829030...
  • Page 31 Setup with smart device (Bluetooth) 7.1 Connecting SITRANS LR120 Modbus Operating Instructions, 10/2022, 62709-76-01, A5E49829030...

  • Page 32: Operating

    Launch the app. Devices in range will appear. Click on the device you wish to connect to. On first connection, a PIN code shipped with the device needs to be entered (see Device Bluetooth and SITRANS LR120 Modbus Operating Instructions, 10/2022, 62709-76-01, A5E49829030...
  • Page 33 Operating Parameter Access Codes sheet). Following successful PIN entry, the device cockpit will be shown. SITRANS LR120 Modbus Operating Instructions, 10/2022, 62709-76-01, A5E49829030...
  • Page 34 Operating Use the Setup/Quick Commissioning to configure the transmitter for your application type. SITRANS LR120 Modbus Operating Instructions, 10/2022, 62709-76-01, A5E49829030...
  • Page 35 Operating SITRANS LR120 Modbus Operating Instructions, 10/2022, 62709-76-01, A5E49829030...
  • Page 36 " Technical data, input variable"). Further information can be found in the document " Regulations for radar level measuring transmitters with radio licenses" on our homepage. Many diagnostic tools are supported, including the echo profile viewer: SITRANS LR120 Modbus Operating Instructions, 10/2022, 62709-76-01, A5E49829030...
  • Page 37 Operating SITRANS LR120 Modbus Operating Instructions, 10/2022, 62709-76-01, A5E49829030...

  • Page 38: Diagnostics And Troubleshooting

    The operator of the system is responsible for taking suitable measures to rectify faults. Causes of malfunction The device offers maximum reliability. Nevertheless, faults can occur during operation. These may be caused by the following, e.g.: • Transmitter • Process • Voltage supply SITRANS LR120 Modbus Operating Instructions, 10/2022, 62709-76-01, A5E49829030...

  • Page 39: Status Messages According To Ne 107

    The status messages are divided into the following categories: • Failure • Function check • Out of specification • Maintenance required and explained by pictographs: Failure - red Out of specification - yellow Function check - orange SITRANS LR120 Modbus Operating Instructions, 10/2022, 62709-76-01, A5E49829030...
  • Page 40 Send transmitter for repair F040 Limit value exceeded in signal Restart transmitter processing Error in the Send transmitter for repair electronics Hardware error F080 General software error Restart transmitter General software error SITRANS LR120 Modbus Operating Instructions, 10/2022, 62709-76-01, A5E49829030...
  • Page 41 Terminal voltage too small Check terminal voltage, increase operating voltage Impermissible operating voltage Maintenance Code Cause Rectification Text message M500 The data could not be restored during Repeat reset the reset to delivery status SITRANS LR120 Modbus Operating Instructions, 10/2022, 62709-76-01, A5E49829030...

  • Page 42: Treatment Of Measurement Errors

    If the output level is constant, the cause could also be the fault setting of the current output to " Hold value". If the level is too low, the reason could be a line resistance that is too high SITRANS LR120 Modbus Operating Instructions, 10/2022, 62709-76-01, A5E49829030...
  • Page 43 Due to strong turbulence and Carry out a auto false echo towards 100 % during foam generation during filling, the suppression filling amplitude of the level echo sinks. Measured value jumps to false signal SITRANS LR120 Modbus Operating Instructions, 10/2022, 62709-76-01, A5E49829030...
  • Page 44 Measured value jumps Varying condensation or Carry out auto false echo sporadically towards contamination on the antenna suppression or increase auto false 100 % during emptying echo suppression in the close range by editing SITRANS LR120 Modbus Operating Instructions, 10/2022, 62709-76-01, A5E49829030...
  • Page 45 Optimize installation position and transmitter orientation Reflections from the medium Select a more suitable installation surface via the vessel wall position, optimize transmitter (deflection) orientation, e.g. with a swivelling holder SITRANS LR120 Modbus Operating Instructions, 10/2022, 62709-76-01, A5E49829030...
  • Page 46 Check parameter "Material Type" around 10 … 20 % medium surface, e.g. an extraction and adapt, if necessary funnel Reflections from the medium Optimize installation position and surface via the vessel wall transmitter orientation (deflection) SITRANS LR120 Modbus Operating Instructions, 10/2022, 62709-76-01, A5E49829030...

  • Page 47: Return Procedure

    Check the item after it has been cleaned. Any devices/replacement parts returned without a decontamination declaration will be cleaned at your expense before further processing. SITRANS LR120 Modbus Operating Instructions, 10/2022, 62709-76-01, A5E49829030...

  • Page 48: Technical Support

    [https://www.siemens.com/ processinstrumentation/certificates] or on an included DVD. How to proceed if a repair is necessary If it is necessary to repair the transmitter, please contact Siemens. You find the locations on " www.siemens.com/processautomation [https://www.siemens.com/ processautomation]. SITRANS LR120 Modbus...
  • Page 49 Diagnostics and troubleshooting 9.7 How to proceed if a repair is necessary SITRANS LR120 Modbus Operating Instructions, 10/2022, 62709-76-01, A5E49829030...

  • Page 50: Service And Maintenance

    Further information about devices containing batteries can be found at: ( https:// support.industry.siemens.com/cs/document/109479891/) Note Special disposal required The device includes components that require special disposal. • Dispose of the device properly and environmentally through a local waste disposal contractor. SITRANS LR120 Modbus Operating Instructions, 10/2022, 62709-76-01, A5E49829030...
  • Page 51 Service and maintenance 10.2 Disposal SITRANS LR120 Modbus Operating Instructions, 10/2022, 62709-76-01, A5E49829030...

  • Page 52: Certificates And Approvals

    [https:// www.siemens.com/level]. 11.4 Food and pharmaceutical certificates Versions for use in the food and pharmaceutical industries are available or in preparation. You can find the respective certificates on www.siemens.com/level [https:// www.siemens.com/level]. SITRANS LR120 Modbus Operating Instructions, 10/2022, 62709-76-01, A5E49829030...

  • Page 53: Conformity

    NE 43 – Signal level for fault information from measuring transducers • NE 53 – Compatibility of field devices and display/adjustment components • NE 107 – Self-monitoring and diagnosis of field devices For further information see www.namur.de [https://www.namur.de]. SITRANS LR120 Modbus Operating Instructions, 10/2022, 62709-76-01, A5E49829030...

  • Page 54: Technical Data And Dimensions

    Technical data Note for approved transmitters Device specifications: Siemens makes every effort to ensure the accuracy of these specifications, but reserves the right to change them at any time. Device-specific approvals: The device-specific approvals are always to be found on the nameplates on the device.
  • Page 55 ±10 mm (measuring distance 0 … 0.25 m/0.8202 ft) Non-repeatability ≤ 2 mm Deviation with bulk solids The values depend to a great extent on the application. Binding specifications are thus not possible. Already included in the meas. deviation SITRANS LR120 Modbus Operating Instructions, 10/2022, 62709-76-01, A5E49829030...
  • Page 56 -40 … +80 °C (-40 … +176 °F) Process pressure -1 … 3 bar (-100 … 300 kPa/-14.5 … 43.51 psig) Bluetooth interface Bluetooth standard Bluetooth 5.0 Frequency 2.402 … 2.480 GHz Max. emitted power +2.2 dBm Max. number of participants Effective range typ. 25 m (82 ft) Depending on the local conditions SITRANS LR120 Modbus Operating Instructions, 10/2022, 62709-76-01, A5E49829030...

  • Page 57: Modbus - Overview

    Outside the specified beam angle, the energy level of the radar signal is 50% (-3 dB) less. 12.2 Modbus – Overview Modbus is a bus system for connecting a host (e.g. PLC) and several slaves (e.g. field devices). SITRANS LR120 Modbus Operating Instructions, 10/2022, 62709-76-01, A5E49829030...

  • Page 58: Communication (Holding Register)

    Byte Oder (Floating enum8 0=ABCD, 1=CDAB, – point format) 2=DCBA, 3=BADC 3200 Distance unit enum16 44=ft, 45=m, 47=in, 49=mm 3201 Temperature unit enum16 32=°C, 33=°F, 35=K °C 3401 Min.-Adjustment float32 0 … Measurement range SITRANS LR120 Modbus Operating Instructions, 10/2022, 62709-76-01, A5E49829030...

  • Page 59: Measured Values (Input Register)

    Quarternary Variable in Byte Order CDAB 1300 Status enum8 See Register 100 1302 float32 Primary Variable in Byte Order of Register 3000 1304 float32 Secondary Variable in Byte Order of Register 3000 SITRANS LR120 Modbus Operating Instructions, 10/2022, 62709-76-01, A5E49829030...
  • Page 60 Third Variable in Byte Order ABCD DCBA (Little Endian) 2108 float32 Quarternary Variable in Byte Order DCBA (Little Endian) 2200 Status enum8 See Register 100 2202 float32 Primary Variable in Byte Order BACD (Middle Endian) SITRANS LR120 Modbus Operating Instructions, 10/2022, 62709-76-01, A5E49829030...

  • Page 61: Additional Measurement Data (Input Register)

    With this command, any number (1-127) of holding registers is read out. The start register, from which the readout should start, and the number of registers are transmitted. SITRANS LR120 Modbus Operating Instructions, 10/2022, 62709-76-01, A5E49829030...
  • Page 62 Data N*2 Bytes Data Implemented function codes: Sub Function Code Name 0x00 Return Data Request 0x0B Return Message Counter With sub function codes 0x00 only one 16 bit value can be written. SITRANS LR120 Modbus Operating Instructions, 10/2022, 62709-76-01, A5E49829030...
  • Page 63 1 Byte Object ID number Number of Objects 1 Byte List of Object ID 1 Byte List of Object length 1 Byte List of Object value 1 Byte Depending on the Object ID SITRANS LR120 Modbus Operating Instructions, 10/2022, 62709-76-01, A5E49829030...

  • Page 64: Configuration Of Typical Modbus Hosts

    12.9 Configuration of typical Modbus hosts 12.9 Configuration of typical Modbus hosts SITRANS LR120 Modbus Modbus Host Voltage supply Figure 12.2 Connection of the SITRANS LR120 Modbus to Modbus Host 12.10 Dimensions Figure 12.3 Dimensions SITRANS LR120 Modbus 12.11 Licensing information for open source software Open source software components are also used in this device.
  • Page 65 Technical data and dimensions 12.12 Trademark SITRANS LR120 Modbus Operating Instructions, 10/2022, 62709-76-01, A5E49829030...
  • Page 66 For more information Process Automation https://www.siemens.com/processautomation Industry Online Support (service and support) https://support.industry.siemens.com Industry Mall https://mall.industry.siemens.com Siemens AG Measurement Intelligence Process Automation 76181, Karlsruhe Germany © 2023 Siemens AG Subject to change A5E49829030...

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