Siemens SIMATIC S7 System Manual page 18

Overview of Fail-safe Systems
1.3 Fail-safe Systems in SIMATIC S7
Use of S7 F/FH Systems
S7 F/FH Systems fail-safe systems are used primarily in process engineering and
instrumentation and control applications in which a safe state can be attained by disabling
the fail-safe outputs.
Integration options for S7 F Systems and
S7 FH Systems in process automation systems using PCS 7 are shown below.
Figure 1-2
1-6
PC
ET 200S
ET 200M
ET 200eco
Use of S7 F/FH Systems
PC
S7-400H
PC
• • •
ET 200S
ET 200M
ET 200M
Safety Engineering in SIMATIC S7
System Manual, 04/2006, A5E00109529-05
PC