Communication Options
3.4 Communication between F-Runtime Groups
Safety Engineering in SIMATIC S7
System Manual, 04/2006, A5E00109529-05
3-5
Data Transfer from the Standard User Program to the Safety Program
Data from the standard user program cannot be processed in the safety program until a
validity check is performed. The user must perform additional process-specific validity
checks in the safety program to ensure that no hazardous conditions can arise.
To process data from the standard user program, safety-related F-data types must be
generated from standard data types with the aid of F_
data type_Fdata type data conversion
blocks. These blocks can be found in the
Failsafe Blocks F-library.
The F_
data type_Fdata type data conversion blocks must be called in the safety program
(CFC, F-runtime group).
3.4
3.4
Communication between F-Runtime Groups
F-Runtime Groups
S7 Distributed Safety: An F-runtime group is a logical construct made of several related
F-blocks.
S7 F/FH Systems: Runtime groups containing fail-safe blocks are called F-runtime groups.
Communication Overview
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Figure 3-3
Communication between F-Runtime groups
Communication
Communication between the F-runtime groups of a safety program is safety-related.
S7 Distributed Safety: F-runtime group communication can take place between the two
F-runtime groups of a safety program in S7 Distributed Safety. Communication takes place
via the "DB for F-runtime group communication".
S7 F/FH Systems: Fail-safe blocks in the
Fail-safe Blocks F-library are available for this
communication. These fail-safe blocks can be used to transfer a fixed number of parameters
of the same F-data type.
See also
