Requirements For Use; Configuration Limits; Project Engineering; Programming - Siemens CM 1542-5 Manual

Requirements for use

4.1

Configuration limits

When using the CM type described here, the following limits apply:
● The number of CMs 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 CM 1542-5 is supplied with the
relevant 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
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
RDREC
GETIO
CM 1542-5
Manual, 11/2014, C79000-G8976-C290-02
Instructions for PROFIBUS DP
Meaning when used with CM
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
Reading the data record of a DP slave
Reading the process image of a DP standard slave
Functions of the CM
The full functionality of the CM 1542-5 (6GK7
542 5DX00 0XE0) can be configured
4
15