Siemens SIMATIC S7 FH - Safety-Related Communication

Safety Mechanisms
Fail-Safe Systems
A5E00085588-03
3-9
3.9 Safety-Related Communication
Communication Overview
The following figure shows the communication options available to an F-system:
Standard
F-Programm
F-Ablaufgruppe
F-Ablaufgruppe
F-CPU
F-SM
F-Treiber
1
5
3
4
Standard program
Standard or F-CPU
F-Programm
F-CPU
6
2
Safety Program
F-run-time group
F-run-time group
F-CPU
F-I/O
F driver
1
5
3
4
Safety Program
F-CPU
6
2
Standard program
Legend:
Safety-related
Non-safety-related
Number Communication Between And Safety-Related
1 Safety Program in F-CPU Standard program No
2 Standard program Safety Program No
3 F-run-time group (RTG) F-run-time group (RTG) Yes
4 Safety Program in F-CPU F-I/O Yes
5 Safety Program in F-CPU Safety Program in F-
CPU
Yes
6 Standard program in standard
or F-CPU
Standard program in
standard or F-CPU
No