Configuring S7 Connections - Siemens SIMATIC PCS 7 Operating Manual

Configuring the safety program
7.3 Configuring fail-safe AS-AS communication
7.3.1

Configuring S7 connections

Configure S7 connections for safety-related AS-AS communication in exactly the same way
as for standard communication (you might need also need to set up a fault-tolerant S7
connection).
Note
You can find instructions on how to do this in the "SIMATIC Process Control System PCS 7
Compendium Part A - Configuration Guidelines".
During communication between automation systems in various subprojects, please make
sure that the S7 subnet ID is the same in each of the respective projects. This ID is involved
in the calculation of the CRC sum at the send and receive blocks and must, therefore, be the
same in each case.
You can find instructions about how to create a specified communication connection
between two multiprojects in the FAQ "How can data be sent with PCS 7 to an H-CPU which
was not created in the same multiproject?"
(https://support.industry.siemens.com/cs/ww/en/view/43033406).
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Compendium Part B - Process Safety (V8.2)
Operating Manual, 07/2016, A5E35031794-AB