Glossary - Siemens 6ES7 972-4AA02-0XA0 User Manual

User´s Guide Power Rail Booster Version 12/2005

11 Glossary

Automation System
An automation system is a programmable controller consisting of at least one CPU, a
variety of input and output modules, and HMI devices.
Baud Rate
data
The baud rate is the speed at which are transmitted, and specifies the number of bits
transmitted per second (baud rate = bit rate). The Power Rail Booster can accommodate
baud rates of between 9.6 kbaud to 500 kbaud.
Bounce
Single or repeated, coincidental or reproducible disengaging or re-engaging of a
sliding contact from resp. with the contact rail.
Bus
Shared transmission path to which all nodes are connected; has two defined ends.
On the Power Rail Booster, the bus is a two-wire line or a pair of contact rails.
Bus Connector
Physical connector between bus node and bus cable.
Contact Rail
Stationary component of a control rail system.
Contact Rail System
A contact rail system consists of sliding contacts and contact rails. A contact rail system can
be used to transport power and data, the contact rail system ensuring mobile contact
between stationary and mobile components.
Distributed I/O
Distributed I/O are input/output units which are not plugged into the central controller, but are
set up at a greater distance from the CPU, e.g. ET 200M, ET 200B, ET 200X, ET 200L, ET
200S. Distributed I/O are connected to the DP master via PROFIBUS DP.
Double Rail Section
A rail section in "double" design to prevent short circuits between two contact rail segments,
which can occur when a (double) sliding contact travels over a rail section.
Double Sliding Contacts/Double Collectors
An arrangement of two primarily mechanical, independently supported sliding contacts,
which together establish contact with a high level of contact stability.
DP
Distributed I/O
DP Master
A master with behavioural characteristics to Standard EN 50170, Volume 2, PROFIBUS is
referred to as a DP master.
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