Glossary-1
ET 200S Interface Module IM 151/CPU
A5E00058783-01
Glossary
Accumulator
The accumulators are registers in the CPU and are used as intermediate
memory for loading, transfer, comparison, calculation and conversion operations.
Address
An address is the designation for a certain address ID or address area (e.g.
input I 12.1; memory word MW 25; data block DB 3).
Aggregate Current
The sum of the currents of all the output channels of a digital output module.
Automation System
An automation system is a programmable logic controller consisting of at least
one CPU, various input and output modules and operator interfaces.
Backup Memory
The backup memory is for memory areas of the CPU without a backup battery.
A configurable number of timers, counters, memory markers and data bytes
(retentive timers, counters, memories and data bytes) is backed up.
Bus
A common transmission path connecting all nodes and having two defined ends.
In the case of the ET 200S, the bus is a two-wire or fiber-optic cable.
Chassis Ground
Chassis ground refers to all the interconnected inactive parts of a piece of
equipment that, even in the event of a fault, cannot carry voltage that is
dangerous to the touch.
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