Siemens Simatic ET 200S Operating Instructions Manual page 317

Glossary
Aggregate current
Total of all currents of all output channels of a digital output module.
Automation system
An automation system is a programmable control system, consisting of at least one CPU,
various input and output modules as well as operating and monitoring devices.
AUX1 bus
Power modules permit you to connect any additional potential (up to 230 VAC), which you
can apply by means of the AUX(iliary) bus. You can use the AUX(iliary) bus as required:
• As a protective conductor bar
• For additional voltage when required
Backplane bus
The backplane bus is a serial data bus via which the interface module IM 151-1
communicates with the electronic modules/motor starters and supplies them with the
necessary voltage. The connection between the individual modules is established by means
of the terminal modules.
Baud rate
The Baud rate is the speed at which data is transmitted and specifies the number of bits
transmitted per second (Baud rate = bit rate).
In the case of the ET 200S, baud rates of 9.6 kBaud to 12 MBaud are possible.
Bus
A common transfer route connecting all nodes and having two defined ends.
In the case of the ET 200, the bus is a two-wire or fiber-optic cable.
Bus connector
A physical connection between the bus node and the bus line.
ET 200S
Operating Instructions, 12/2005, A5E00515771-03
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