103BCommunication
10.3 PROFIBUS
S7-1200 Programmable controller
System Manual, 11/2011, A5E02486680-05
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PROFIBUS communications partners of the S7-1200
The two PROFIBUS CMs allow the S7-1200 to exchange data with the following
communications partners.
●
CM 1242-5
The CM 1242-5 (DP slave) can be the communications partner of 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
–
Programmable controllers of various vendors
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CM 1243-5
The CM 1243-5 (DP master) can be the communications partner of the following DP
V0/V1 slaves:
–
Distributed I/O SIMATIC ET200
–
S7-1200 CPUs with CM 1242-5
–
S7-200 CPUs with PROFIBUS DP module EM 277
–
SINAMICS converter
–
Drives and actuators from various vendors
–
Sensors of various vendors
–
S7-300/400 CPU with PROFIBUS interface
–
S7-300/400 CPU with PROFIBUS CP (for example CP 342-5)
–
SIMATIC PC stations with PROFIBUS CP
Types of communication with DP-V1
The following types of communication are available with DP-V1:
●
Cyclic communication (CM 1242-5 and CM 1243-5)
Both PROFIBUS modules support cyclic communication for the transfer of process data
between DP slave and DP master.
Cyclic communication is handled by the operating system of the CPU. No software blocks
are required for this. The I/O data is read or written directly from/to the process image of
the CPU.
●
Acyclic communication (CM 1243-5 only)
The DP master module also supports acyclic communication using software blocks:
–
The "RALRM" instruction is available for interrupt handling.
–
The "RDREC" and "WRREC" instructions are available for transferring configuration
and diagnostics data.