Communications Modules Profibus; Connecting To Profibus; Communications Services Of The Profibus Cms - Siemens SIMATIC S7 System Manual

103BCommunication
10.3 PROFIBUS
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
● CM 1243-5
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
● 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.
444
Operates as DP slave
Operates as DP master class 1
and
S7-1200 Programmable controller
System Manual, 11/2011, A5E02486680-05