103BCommunication
10.3 PROFIBUS
S7-1200 Programmable controller
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System Manual, 11/2011, A5E02486680-05
10.3.1
Communications modules PROFIBUS
10.3.1.1
Connecting to PROFIBUS
Connecting the S7-1200 to PROFIBUS DP
The S7-1200 can be connected to a PROFIBUS fieldbus system with the following
communications modules:
●
CM 1242-5
Operates as DP slave
●
CM 1243-5
Operates as DP master class 1
If a CM 1242-5 and a CM 1243-5 are installed together, an S7-1200 can perform the
following tasks simultaneously:
●
Slave of a higher-level DP master system
and
●
Master of a lower-level DP master system
10.3.1.2
Communications services of the PROFIBUS CMs
Bus protocol
The PROFIBUS CMs use the PROFIBUS DP-V1 protocol.