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System error
U
User
program
W
Warm restart
CM35 Counter Module
(4) J31069-D0416-U001-A5-7618
System errors are those errors which can occur on a programmable controller
(i.e., not in the process). System errors are programming errors on the CPU
and physical defects on the modules, for example.
The user program contains all instructions and declarations, and data for
signal processing via which a system or a process can be controlled. This
program is assigned to a programmable module (e.g., CPU or FM) and can be
structured in smaller units (blocks).
When a CPU starts up (e.g., after you turn the operating mode switch from
STOP to RUN or turn the power on), organization block OB 100 (warm re-
start) is executed first before cyclic program processing begins (OB 1).
During a warm restart, the process image of the inputs is read and the STEP 7
application program is processed starting with the first command in OB 1.
Glossary
Glossary-5
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