Communication Options
3.6 Safety-Related CPU-CPU Communication
Safety Engineering in SIMATIC S7
3-16
System Manual, 04/2006, A5E00109529-05
Additional Information
For detailed information on configuring and programming
safety-related master-I-slave communication, refer to the
S7 Distributed Safety Configuring
and Programming manual.
See also
Configuring the F-I/O (Page 6-4)
3.6.3
S7 Distributed Safety: Safety-Related I-Slave-I-Slave Communication
Introduction
In S7 Distributed Safety, safety-related CPU-CPU communication between the safety
programs of the F-CPUs for I-slaves takes place in standard mode via data exchange.
Communication Overview
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Figure 3-9
S7 Distributed Safety: Safety-Related I-Slave-I-Slave Communication
I-Slave-I-Slave Communication
Safety-related communication takes place with the aid of two fail-safe application blocks: the
F_SENDDP block for sending data and the F_RCVDP block for receiving data. These blocks
are called by the user in the respective safety program of the F-CPU. They can be used to
transfer a fixed number of fail-safe data of data types BOOL and INT in a fail-safe manner.
