Siemens SIMATIC S7-400 Reference Manual page 454

Glossary
Ungrounded
Without electrical connection to ground.
Warm restart
Warm restart following a power down with a set of dynamic data programmed by the user und
a user program component specified in the system.
A warm restart is characterized by the setting of a status bit or other suitable means that can
be read by the user program and indicate that the stoppage of the automation system caused
by a power down was detected in RUN mode.
Wire break
Parameter in STEP 7. A line continuity or wire break check is used to monitor the connection
from the input to the sensor or from the output to the actuator. If a broken wire is detected, the
module senses a current flow at the input/output set in the parameter assignment.
Work memory
The work memory is a → RAM area on the → CPU that is accessed by the processor during
execution of the user program.
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S7-400 Automation System Module Data
Reference Manual, Ausgabe 11/2016, A5E00850736-08