Product Overview; Introduction; Using Fail-Safe Signal Modules - Siemens S7-300 Installation And Operating Manual

Product overview

1.1

Introduction

In this chapter
The product overview provides information about
● the integration of fail-safe signal modules in SIMATIC S7 fail-safe automation systems
● available fail-safe signal modules
● steps to take, starting with the selection and ending with the commissioning of fail-safe
1.2

Using Fail-Safe Signal Modules

Fail-safe automation system
Fail-safe automation systems (F-systems) are used in plants which are subject to more
stringent safety standards. F-systems are used to control processes and to force the plant
into a safe state after shutdown. That is, F-systems control processes which do not pose a
risk to human beings or to the environment when shut down immediately.
Fail-safe signal modules
Compared to standard modules of the S7-300 module family, the fail-safe signal modules
differ in terms of their internal dual-channel structure. The two integrated processors monitor
each other, automatically test the I/O circuits, and force the fail-safe signal module into safe
state when a fault/error has been detected. The F-CPU communicates with the fail-safe
signal module by means of the safety-oriented PROFIsafe bus profile.
Fail-safe signal modules
Installation and Operating Manual, 01/2010, A5E00085586-10
modules.
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