User Manual

Easy to communicate between devices
7.6 PROFIBUS
Easy Book
Manual, 03/2014, A5E02486774-AF
143
The S7-1200 is connected to a PROFIBUS network as a DP slave with the CM 1242-5
communication module. The CM 1242-5 (DP slave) module can be the communications
partner of DP V0/V1 masters. If you want to configure the module in a third-party system,
there is a GSD file available for the CM 1242-5 (DP slave) on the CD that ships with the
module and on Siemens Automation Customer Support
(http://support.automation.siemens.com/WW/llisapi.dll?func=cslib.csinfo&lang=en&objid=6G
K72425DX300XE0&caller=view) pages on the Internet.
In the figure below, the S7-1200 is a DP slave to an S7-300 controller:
The S7-1200 is connected to a PROFIBUS network as a DP master with the CM 1243-5
communication module. The CM 1243-5 (DP master) module can be the communications
partner of DP V0/V1 slaves. In the figure below, the S7-1200 is a master controlling an
ET200S DP slave:
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:
For V4.0, 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.