S7-300 Programmable Controller Hardware and Installation
A5E00105492-01
12-1
12Glossary
12
Accumulator
The --> CPU uses the accumulator registers as intermediate memory for load,
transfer, comparison, calculation and conversion operations.
Address
The address represents the ID for a specific operand or operand range. Example:
Input I 12.1; Memory bit Word MW25; Data block DB3.
Analog module
Analog modules convert process values (e.g. temperature) into digital values, so
that they can be processed by the central processing unit, or convert digital values
into analog manipulated variables.
Automation system
An automation system in the context of SIMATIC S7 --> is a programmable logic
controller.
Backplane Bus
The serial backplane data bus supplies the power required by the modules. It is
also used by the modules for communication. The connection between the
modules is established by bus connectors.
Backup memory
This memory is used to backup memory areas of --> CPUs not equipped with a
backup battery. A configurable number of timers, counters, memories and data
bytes (retentive timers, counters, memories and data bytes) is backed up.
Bus segment
A bus segment is a self-contained section of a serial bus system. Bus segments
are interconnected using repeaters.
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