SIMOCODE pro - Fail-Safe Digital Modules
Manual, 11/2017, NEB631679702000/RS-AA/002
39
General remarks
Safety chain
A safety chain generally consists of the Sense, Evaluate and Deactivate functions.
Detecting a safety requirement, e.g.:
● By a safe trip signal, triggered by a fail-safe hardware output signal
● By a tripped emergency stop actuator
● By a trip signal transmitted by a fail-safe controller (F-CPU) via PROFIsafe.
The detection of a safety requirement and the safe initiation of the response, e.g. safety-
related tripping of the enabling circuits of the fail-safe DM-F Local or DM-F PROFIsafe digital
module.
The response to an emergency or a risk event, e.g. by deactivating dangerous actuators.
The fail-safe digital modules play an active part in evaluation and deactivation within this
safety chain.
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