Siemens Simatic M7-400 Reference Manual page 626

Glossary
Warm restart
This is a reboot after a power failure using a set of dynamic data programmed by
the user and a user program section defined in the system.
A warm restart is indicated by setting a status bit or by some other appropriate
means that can be read by the user program and indicate that the standstill of the
programmable controller, brought about by a power failure, has been detected in
RUN mode.
Wire break
Parameter in STEP 7. A wire break test is used for monitoring the connection
from the input to the encoder and from the output to the actuator. With wire
break, the module detects a flow of current at the appropriately parameterized
input/output.
Working memory
The working memory is a ³ random access memory in the ³ CPU which the
processor accesses during program execution of the user program.
Glossary-20
S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07