Product Overview
Fail-Safe Systems
1-4 A5E00085588-03
1.2 Basic Configuration Variants
This section describes the two basic configuration variants of F-Systems:
• Fail-safe S7 F System
• Fail-safe, fault-tolerant S7 FH System
S7 F System
The S7 F System is a fail-safe automation system consisting of at least the
following components:
• An F-capable CPU module such as CPU 417-4 H that can run a fail-safe (F)
user program
• One or more fail-safe inputs/outputs (F-I/Os) in a distributed I/O device
(redundancy optional)
The following figure shows the hardware and software components of an F
System.
You can expand the configuration with standard S7-400 and S7-300
modules.
Programmable controller
S
ET 200M distributed I/O device
Fail-
(optionally redundant)
ET 200M distributed I/O device
Standard modules
(optionally redundant)
Operator Station
(system visualization)
Programming device
ET 200S distributed I/O device
Standard modules
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