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Requirements for use
4.1
Configuration limits
When using the CP type described here, the following limits apply:
● The number of CPs that can be operated in a rack depends on the CPU type being used.
Note the information in the documentation of the CPU, see Guide to the documentation
(Page 7)
4.2
Project engineering
Configuration and downloading the configuration data
When the configuration data is downloaded to the CPU, the CP 1542-5 is supplied with the
configuration information. The configuration data can be downloaded to the CPU via
PROFIBUS or any PROFINET interface of the S7-1500 station.
The following version of STEP 7 is required:
STEP 7 version and additional modules
STEP 7 Professional V12 SP1
4.3
Programming
Program blocks
For communications services, there are preprogrammed program blocks (instructions)
available as the interface in your STEP 7 user program.
Table 4- 1
System blocks and sys-
tem functions
DPSYC_FR
DPNRM_DG
DP_TOPOL
WRREC
CP 1542-5
Manual, 11/2014, C79000-G8976-C326-03
Instructions for PROFIBUS DP
Meaning when used with CP
DP slaves synchronize / freeze inputs (SYNC/FREEZE instruction)
Reading the diagnostics data of a DP slave
Detecting the topology for the DP master system
Writing the data record of a DP slave
Functions of the CP
The full functionality of the CP 1542-5 (6GK7
542 5FX00 0XE0) can be configured
4
15
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