Glossary
S7-300 Automation System Module data
Glossary-2 Manual, 08/2006, A5E00105505-04
Bus
A transfer medium that interconnects several nodes. Data may be transferred in serial or
parallel mode, using electrical or fiber-optic conductors.
Bus segment
Self-contained part of a bus system. Bus segments are coupled by means of → Repeater.
CiR
Plant changes in RUN (Configuration in RUN)
Common mode voltage (CMV)
The voltage common to all terminals of a group, measured between this group and any
reference point (usually ground potential.)
Communications processor
Programmable S7 communications module, used for networking, PtP coupling, for example.
Compensating box
Can be used for temperature measurements using thermocouples connected to analog input
modules. Represents a compensation circuit used to compensate temperature fluctuation at
the → Reference junction.
Configuring
Refers to the selection and assembly of automation system components, or to software
installation and adaptation to a specific process (by programming the modules, for example.)
CP
→ Communications processor
CPU
Central Processing Unit of the → Automation System. A CPU stores and executes the user
program. It contains the operating system, memory, processing unit and communications
interfaces.
Cumulative current
Cumulative current of all output channels of a digital output module.
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