Siemens SIMATIC ET 200M Manual page 218

Glossary
Automation system
An automation system is a ³ programmable logic controller consisting of at least
one ³ CPU, various input and output modules and operator interfaces.
Backplane bus
The backplane bus is a serial data bus via which the modules communicate and
via which the necessary power is supplied to the modules. The connection
between the modules is established by bus connectors.
Baud rate
The baud rate of a data transfer is measured in bits transmitted per second
(baud rate = bit rate).
In the case of the ET 200, baud rates of 9.6 kbaud to 12 Mbaud are possible.
Bus
A common transmission line connecting all nodes. Has two defined ends.
In the case of the ET 200, the bus is a two-wire or fiber-optic cable.
Bus node
A device that can send, receive or amplify data via the bus, such as a DP
master, DP slave, RS 485 repeater or active star coupler.
Bus segment
³ Segment
Distributed I/O Device ET 200M
EWA-4NEB780600602-06
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