Configurations and Help with Selection
2.4 S7 Distributed Safety or S7 F/FH Systems – Selection Guide
Safety Engineering in SIMATIC S7
System Manual, 04/2006, A5E00109529-05
2-23
Requirements Satisfied by Both S7 Distributed Safety and S7 F/FH Systems
There is no difference in the F-systems with regard to the following requirements. That is,
S7 Distributed Safety and S7 F/FH Systems are equally applicable:
•
Configuration is possible using copper or fiber-optic technology.
(Fiber-optic technology should be used in standard automation systems if large distances
are to be spanned or if the system will be subjected to strong electromagnetic
interference.)
•
Safety classes SIL2/Category 3 and SIL3/Category 4 can be achieved.
System Configuration of F-System
The limits for the system configuration of a fail-safe system are determined mainly by the
F-CPU used. The memory configuration for all applicable F-CPUs is available in the
"Memory Configuration of F-CPUs" table in "Performance Characteristics of S7 Distributed
Safety and S7 F/FH Systems". Additional values are provided in the technical specifications
for the F-CPU in the respective F-CPU manual.
You can find information about possible limitations for S7 FH Systems in the
Automation
System S7-400FH Fault-Tolerant Systems manual and in the readme file of the
S7 H Systems optional package.
See also
Performance Characteristics of S7 Distributed Safety and S7 F/FH Systems (Page 1-7)
S7 F Systems Fail-safe System (Page 2-5)
