Distributed I/O Instructions; Configuration Examples For Profibus - Siemens SIMATIC S7-1200 Manual

Easy to communicate between devices
7.6 PROFIBUS
7.6.1

Distributed I/O Instructions

The following Distributed I/O instructions can be used with PROFIBUS:
● RDREC instruction: You can read a data record with the number INDEX from a
● WRREC instruction: You can transfer a data record with the number INDEX to a DP slave
● RALRM instruction: You can receive an interrupt with all corresponding information from
● DPRD_DAT instruction: The CPU supports up to 64 bytes of consistent data. You must
● DPWR_DAT instruction: The CPU supports up to 64 bytes of consistent data. You must
● DPNRM_DG instruction: You can read the current diagnostic data of a DP slave in the
7.6.2

Configuration examples for PROFIBUS

Below, you will find examples of configurations in which the CM 1242-5 is used as a
PROFIBUS slave and the CM 1243-5 is used as a PROFIBUS master.
SIMATIC S7-1200
with CM 1242-5
Operator control &
Figure 7-1
138
component.
component defined by ID.
a DP slave component and supply this information to its output parameters.
read consistent data areas greater than 64 bytes from a DP standard slave with the
DPRD_DAT instruction.
write consistent data areas greater than 64 bytes to a DP standard slave with the
DPWR_DAT instruction.
format specified by EN 50 170 Volume 2, PROFIBUS.
PG/PC/IPC
PROFINET/
Industrial Ethernet
monitoring
Configuration example with a CM 1242-5 as PROFIBUS slave
SIMATIC S7-300
OLM
PROFIBUS
(LWL)
Operator control &
monitoring
OLM
SIMATIC S7-1200
with CM 1242-5
Manual, 11/2011, A5E02486774-04
PROFIBUS
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