S5-95U, SINEC L2 List of Abbreviations/Glossary
EWA 4NEB 812 6112-02
C-3
Glossary
A
Active star coupler Resource for coupling fiber optic cables
Active station When ready to send data, an active station may send data to, and
request data from, other stations on the LAN
B
Baud rate Data transmission speed expressed as the number of bits
transmitted per second (baud rate = bit rate)
Bit time unit The time taken to transmit a bit (the reciprocal of the baud rate)
Bit-serial field bus system Bus system used at the field level in integrated automation
systems; information is transmitted in bit-serial mode over the bus
cable
Broadcast Data and information sent from an active station to all active and
passive stations on the LAN
Bus Common transmission path to which all stations are connected
Bus cable Twisted-pair, shielded cable for connecting stations with each other
Bus connector Resource for the direct interconnection of stations on the LAN
Bus terminal Resource used for connecting a station to the bus cable
C
Cell level A hierarchical level in an integrated automation system: Receives
production orders from the process supervision level; this level is
generally represented by manufacturing cells, each of which is
controlled by at least one PLC
Communications processor That part of a PLC controlling message traffic over the SINEC L2
LAN parallel to the control processor
Confirmation Acknowledgement of a service request
Coordination byte Diagnostic byte for flagging error and coordination information when
sending and/or receiving data over a standard connection
Cyclic I/O (ZP) Cyclic data interchange between ZP master (generally active
station) and ZP slaves (generally passive stations)
D
Data transmission Activity on the transmission link (bus or LAN cable)
E
Explicit communications The time at which communications take place is determined by the
setting of an initiation bit in the user program
F
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