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