System Configuration - Siemens SIMATIC S7 F Manual

Safety
Example:
A safety function is implemented with an S7 FH System. The CPUs and F-SMs
involved in the safety function are listed in the table below. These CPUs and F-
SMs are used in a redundant configuration. Their proof test interval is 10 years.
The F-SMs are in safety mode for SIL 3. Operation is in high demand mode:
CPUs, F SMs and Safety-
Related Communication
Equipment Involved in the
Safety Function.
F-capable CPU
SM 326; DO 10 x DC 24V/2A;
with diagnostic interrupt
6ES7 326-2BF00-0AB0
SM 326; DI 24 x DC 24V; with
diagnostic interrupt
6ES7 326-1BK00-0AB0
Safety-related communication
Total
7.3

System Configuration

The limits for the system configuration of the S7 F/FH System are set mainly by the
CPU used. You can find the relevant values in the technical specifications of the
CPU in /3/, Chapter 5.
You will find any restrictions that apply to the S7 FH System in the readme file in
the "S7 H Systems" optional package.
In Appendix A you will find the certified hardware and software components of an
F-system in the form of check lists.
Fail-Safe Systems
A5E00085588-03
Number Redundancy
1 Yes
1 Yes
2 Yes
Probability of a
Hazardous Failure
per Hour
1,42E-09
1,59E-10
2,28E-12
1,00E-09
2,58E-09
7-7