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Siemens SIMATIC Operating Instructions Manual page 171

Distributed i/o fail-safe engineering et 200pro distributed i/o system - fail-safe modules
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Safety-Related Communication
Safety-related communication is used to exchange fail-safe data.
Sensor Evaluation
There are two types of sensor evaluation:
-> 1oo1 evaluation - Sensor signal is read in once.
-> 1oo2 evaluation - Sensor signal is read in twice from the same F-module and compared
internally.
Sensors
Sensors are used for accurate detection of digital and analog signals as well as routes,
positions, velocities, rotational speeds, masses, etc.
Static Parameters
Static parameters can only be set when the CPU is in STOP mode and cannot be changed
by means of SFC (system function) while the user program is running.
Terminating Module
The ET 200pro distributed I/O device is terminated with the terminating module. If a
terminating module is not inserted, the ET 200pro is not ready for operation.
ET 200pro Distributed I/O System - Fail-Safe Modules
Operating Instructions, 05/2007, A5E00394073-02
Glossary
171
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