Siemens SIMATIC S7-1500/ET 200MP System Manual page 379

Glossary
PROFINET IO device
Distributed field device that can be assigned to one or more IO controllers (e.g. distributed I/O
system, valve terminals, frequency converters, switches).
Push-in terminal
Terminal for the tool-free connection of wires.
Reference potential
Potential from which the voltages of the circuits involved are observed and/or measured.
Restart
During a warm restart, all non-retentive bit memory is deleted and non-retentive DB contents
are reset to the initial values from load memory. Retentive bit memory and retentive DB
contents are retained. Program execution begins at the call of the first startup OB.
Retentivity
A memory area whose content is retained after power failure and after a STOP to RUN
transition is retentive. The non-retentive area bit memory area, timers and counters are reset
after a power failure and after a STOP to RUN transition. The non-retentive content of data
blocks is reset to the initial values.
Row
All the modules attached to a mounting rail.
Runtime error
Error that occurs during execution of the user program in the automation system (thus not in
the process).
SELV
Safety Extra Low Voltage = Safety extra-low voltage
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Automation system
System Manual, 01/2023, A5E03461182-AK