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Siemens SIMATIC Operating Instructions Manual page 132

Distributed i/o fail-safe engineering et 200pro distributed i/o system - fail-safe modules
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Fail-Safe Electronic Modules
8.3 F -Switch PROFIsafe Digital Electronic Module
Safety-Related Shutdown of Standard Output Modules
Safety-related activation of standard DO module outputs is not possible. Only safety-related
shutdown is possible. The following issues must therefore be taken into consideration:
In the worst case you must consider all possible faults of the standard DO modules and the
program controlling them for which there is no direct fault detection. For example, the FM-
Switch PROFIsafe does not detect external short circuits to L+ at the standard DO module
outputs.
All faults of the standard DO modules influence the process by means of final controlling
elements.
The process status must be made known to the F-CPU by way of sensors and a suitable
safety program.
The safety program must react in a safety-related and logically suitable fashion to
unwanted or potentially dangerous states in the process using the F-Switch PROFIsafe and
fail-safe output modules.
See also
on the Internet (http://www.siemens.com/automation/support-request)
132
WARNING
ET 200pro Distributed I/O System - Fail-Safe Modules
Operating Instructions, 05/2007, A5E00394073-02
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