Glossary - Siemens ET 200pro Operating Instructions Manual

Glossary

Aggregate current
Accumulated current of all output channels of a digital output module.
Automation system
Programmable logic controller, consisting of at least one CPU, diverse I/O modules, and HMI
devices.
Autonegotiation
Configuration protocol in the Fast Ethernet. Before the actual data transfer, the devices on
the network agree on a transfer mode that each participating device can master (100 Mbps
or 10 Mbps, full duplex or half duplex).
Backplane bus
Serial data bus used via which the interface module communicates with electronic modules
and supplies them with power. The various modules are interconnected via bus modules.
Baud rate
Data transfer speed, defines the number of transferred bits per second.
ET 200pro supports a baud rate of between 9.6 kBaud and 12 MBaud.
Bus
Shared transfer path to which all devices are connected. It has two defined ends.
In an ET 200 system, the bus is a two-wire line or fiber-optic cable.
Bus connector
Physical connection between the bus device and the bus cable.
Bus device
Device which sends, receives and amplifies data via the bus. Example: DP master,
DP slave, RS 485 repeater.
ET 200pro distributed I/O system
Operating Instructions, 03/2013, A5E00335544-08
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