Siemens SIMATIC ET 200SP System Manual page 309

M-switch
Each fail-safe digital output of ET 200SP 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.
Node
Device that can send, receive or amplify data via the bus, e.g. IO device via PROFINET IO.
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).
Overload release
Overcurrent release that provides protection against overload.
Parameter assignment
Parameter assignment is the transfer of parameters from the IO controller/DP master to the
IO device/DP slave.
Passivation
If an → F-I/O module 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 module are passivated. The F-I/O module
signals the detected faults to the → F-CPU.
When passivating channels at F-I/O with inputs, the → F-System provides fail-safe values for
the → safety program instead of the process values pending at the fail-safe inputs.
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.
PELV
Protective Extra Low Voltage
Performance Level
Performance Level (PL) in accordance with ISO 13849-1 or EN ISO 13849-1
Potential group
Group of I/O modules that are jointly supplied with voltage.
Distributed I/O system
System Manual, 09/2019, A5E03576849-AJ
(current sinking). The load is connected between the P-
x
Glossary
(current
x
309