Glossary
ET 200S Distributed I/O System - Fail-Safe Modules
214 Installation and Operating Manual, 08/2008, A5E00103686-07
M-switch
Each fail-safe digital output of the ET 200S F-modules consists of a P-switch DOx P and an
M-switch DOx M. The load is connected between the P and M-switches. To ensure voltage
is applied to the load, both switches are always activated.
Nonequivalent sensor
An exclusive OR -> sensor is a changeover switch that is wired in -> fail-safe systems (dual-
channel connection) to two inputs of a -> fail-safe I/O (for -> 1oo2 evaluation of sensor
signals).
Parameter assignment
Assigning parameters with PROFIBUS DP: Transfer of slave parameters from the DP master
to the DP slave
Assigning parameters to modules/submodules: Sets the behavior of modules/submodules
with the
STEP 7
configuration software
Passivation
If an -> F-I/O detects a fault, it switches either the affected channel or all channels to a ->
safe state; i.e. the channels of this F-I/O are passivated. The F-I/O reports the detected fault
to the -> F-CPU.
When passivating channels at F-I/O with inputs, the -> F-system returns fail-safe values
instead of the process values pending at the fail-safe inputs to the -> safety program.
When passivating channels at F-I/O with outputs, the F-system returns fail-safe values (0) to
the fail-safe outputs instead of the output values provided by the safety program.
PD
PProgramming ddevice (PD): Personal computer in special compact industrial design. A PD
is fully equipped for programming SIMATIC automation systems.
Performance Level
Performance Level (PL) to ISO 13849
Potential group
A group of electronic modules supplied by the same power module.
Prewiring
Denotes the wiring of terminal modules prior to insertion of the electronic modules.
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