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ET 200pro Distributed I/O System - Fail-Safe Modules
Operating Instructions, 05/2007, A5E00394073-02
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Product Overview
1
Overview
This chapter provides information about the following topics:
●
ET 200pro distributed I/O system with fail-safe modules and its place in SIMATIC S7 fail-
safe automation systems
● Components comprising the ET 200pro distributed I/O system with fail-safe modules
● The steps you must perform, ranging from selection of the F-modules to commissioning
of ET 200S on PROFIBUS DP/PROFINET IO
1.1 ET 200pro Fail-Safe Modules
Fail-Safe Automation System
Fail-safe automation systems (F-systems) are used in systems with increased safety
requirements. F-systems are used to control processes that can achieve a safe state
immediately as a result of a shutdown. In other words, F-systems control processes where
an immediate shutdown will not endanger humans or the environment.
ET 200pro Distributed I/O System
The ET 200pro distributed I/O system is a DP slave/IO device on PROFIBUS DP/PROFINET
IO that can contain fail-safe modules in addition to ET 200pro standard modules.
You can use copper cables to assemble the PROFIBUS DP/PROFINET IO lines.
Fail-Safe Modules
The primary difference between fail-safe modules and ET 200pro standard modules is that
fail-safe modules have a two-channel internal design. The two integrated processors monitor
each other, automatically test the input and output circuits and set the F-module to a safe
state in the event of a fault. The F-CPU communicates with the fail-safe module using the
PROFIsafe safety-related bus profile.
Fail-safe digital input modules record the signal states of safety-related sensors and send
corresponding safety message frames to the F-CPU.
Fail-safe digital output modules are suitable for shutdown operations with short-circuit and
cross-circuit monitoring up to the actuator.
Fail-safe switch acquires the signal states of safety-related sensors and sends
corresponding safety message frames to the F-CPU and is suitable for connection of
frequency converters, motors, and output modules.
Fail-safe connection modules are mounted on the fail-safe electronic modules. They are
used to connect sensors and actuators.