SIMATIC CM 1242-5
Operating Instructions, 01/2023, C79000-G8976-C245-06
9
Application and properties
1.1 Connecting the S7-1200 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
1.2 Communications services of the CM
Bus protocol
PROFIBUS communication with the S7-1200 CMs is based on the PROFIBUS DP-V1 protocol.
The supported functions are described below.
When configuring in third-party systems with the GSD file, the CM 1242-5 can also be
operated as a DP-V0 slave, refer to section Configuration (Page 27).
Possible DP masters for the DP slave CM 1242-5
With the DP slave module CM 1242-5, the S7-1200 can communicate with the following
DP-V0/V1 masters:
• SIMATIC S7-1200, S7-300, S7-400, S7-Modular Embedded Controller
• DP master modules and the distributed IO SIMATIC ET200
• SIMATIC PC stations
• SIMATIC NET IE/PB Link PN IO
• Programmable controllers of various vendors
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