Glossary - Siemens SIMATIC ET 200iSP Operating Instructions Manual

Glossary

ACCU
Accumulators are registers in the CPU used as buffer storage for load and transfer operations,
as well as comparison, arithmetic, and conversion operations.
Accumulated current
Total current of all 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.
Backplane bus
A serial data bus used by the interface module IM 152 to communicate with the electronic
modules. Also supplies these with the required voltage. The various modules are
interconnected by means of terminal modules.
Baud rate
The baud rate is the speed at which data is transferred. It indicates the number of bits
transferred per second (baud rate = bit rate).
Bus
Shared data transmission path to which all nodes are connected. It has two defined ends.
In an ET 200 system, the bus is a twisted-pair cable or an optical fiber cable.
Bus connector
Physical connection between the bus nodes and the bus cable.
Chassis ground
Chassis ground includes all the interconnected inactive parts of equipment that must not carry
a hazardous voltage even in the event of a fault.
Diagnostics
The detection, localization, classification, visualization and further evaluation of errors, faults
and messages.
ET 200iSP
Operating Instructions, 11/2017, A5E00247483-07
365