Communication
11.3 PROFIBUS
S7-1200 Programmable controller
System Manual, V4.2, 09/2016, A5E02486680-AK
969
If a CM 1242-5 and a CM 1243-5 are installed together, an S7-1200 can perform as both a
slave of a higher-level DP master system and a master of a lower-level DP slave system,
simultaneously:
As of V3.0, you can configure a maximum of three PROFIBUS CMs per station, in which
there can be any combination of DP master or DP slave CMs. DP masters in a V3.0 or
greater CPU firmware implementation can each control a maximum of 32 slaves.
The configuration data of the PROFIBUS CMs is stored on the local CPU. This allows simple
replacement of these communications modules when necessary.
To use PROFIBUS with S7-1200 V4.0 or later CPUs, you must upgrade the PROFIBUS
Master CM firmware to at least V1.3.
date the PROFIBUS CM firmware to the latest version available
http://support.automation.siemens.com/WW/view/en/42131407). You can perform a
firmware update by any of these methods:
Using the online and diagnostic tools of STEP 7 (Page 1318)
Using a SIMATIC memory card (Page 148)
Using the Web server "Module Information" standard Web page (Page 1023)
Using the SIMATIC Automation Tool
(https://support.industry.siemens.com/cs/ww/en/view/98161300)
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