Glossary
Glossary-2
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03
CiR
Equipment changes in running operations (Configuration in RUN)
Common mode voltage
A voltage that is common to all inputs/outputs of a group and is measured be-
tween this group and any reference point (usually to ground).
Communication processor
Programmable module for communication tasks, such as networking, point-to-
point connection.
Comparison point
When using thermocouples on analog input modules: point of known tempera-
ture (for example, → compensating box).
Compensating box
Compensating boxes can be used for measuring temperatures with thermocou-
ples on analog input modules. The compensating box is a compensation circuit
for compensating temperature fluctuations at the → Comparison point.
Complete restart
When a CPU starts up (say, when the mode selector switch is moved from
STOP to RUN or when the mains supply is turned on), OB 100 (Restart) is pro-
cessed before cyclic programming processing (OB 1).
With a complete restart, the → Process input image is read in and the STEP 7
user program is processed, starting with the first instruction in OB1.
Configure
Select and put together different components on a programmable logic controller
and install the requisite software and adapt to the specific use (for example, by
assigning parameters to the modules).
CP
→Communications processor
CPU
The CPU (central processing unit) is a CPU module of the →programmable
logic controller that stores and runs the user program. It contains the operating
system, memory, processing unit and communication interface.
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