Siemens SIMATIC ET 200AL System Manual page 135

I/O modules
All modules that can be operated with a CPU or an interface module.
Identification data
Information that is saved in modules and that supports the user in checking the plant
configuration and locating hardware changes.
Interface module
Module in the distributed I/O system. The interface module connects the distributed
I/O system via a field bus with the CPU (I/O) controller and prepared the data for the/from the
I/O modules.
Module fault
Module faults can be external faults (e.g. missing load voltage) or internal faults
(e.g. processor failure). Internal faults always require module replacement.
Monitoring time
→ PROFIsafe monitoring time
M-switch
Each fail-safe digital output of ET 200AL F-modules consists of a P-switch DO-P
sourcing) and an M-switch DO-M
switch and M-switch. The two switches are always activated so that voltage is applied to the
load.
Nonequivalent sensor
A nonequivalent → sensor is a two-way switch that is connected to two inputs of an → F-I/O
(via 2 channels) in → fail-safe systems (for → 1oo2 evaluation of sensor signals).
Parameter assignment
Parameter assignment is the transfer of parameters from the IO controller to the IO device.
Distributed I/O system
System Manual, 08/2021, A5E31861578-AJ
(current sinking). The load is connected between the P-
x
Glossary
(current
x
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