S7 F/Fh Systems: Safety-Related Communication Via S7 Connections - Siemens SIMATIC S7 System Manual
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3.6 Safety-Related CPU-CPU Communication
3.6.5
S7 F/FH Systems: Safety-Related Communication via S7 Connections
Introduction
In S7 F/FH Systems, safety-related CPU-CPU communication via S7 connections between
the safety programs of two F-CPUs takes place via configured S7 connections or configured
fault-tolerant S7 connections, as in standard mode.
Safety-related CPU-CPU communication is not permitted via public networks.
Communication Overview
Figure 3-11
Table 3-4
Number
Communication via S7 Connections
Safety-related communication takes place with the aid of fail-safe application blocks: the
F_SENDBO and F_SENDR blocks for sending data and the F_RCVBO and F_RCVR blocks
for receiving data. These blocks are called by the user in the relevant safety program of the
F-CPU. These fail-safe application blocks can be used to transfer a user-defined amount of
fail-safe data of data types BOOL and REAL in a fail-safe manner.
3-20
S7 F/FH Systems: Communication between F-CPUs
Safety-Related CPU-CPU Communication
Communication
From...
1
S7 FH Systems
2
S7 F/FH Systems
3
S7 F Systems
1
3
2
To...
Connection Type
S7 FH Systems
S7 connection, fault-tolerant
S7 F Systems
S7 connection, fault-tolerant
S7 F Systems
S7 connection
2
Safety Engineering in SIMATIC S7
System Manual, 04/2006, A5E00109529-05
Safety-
Related
Yes
Yes
Yes
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