BECKHOFF BC8000 - Manual (Page 6)

Basic information
6 BC8000
Display of channel status
The integrated light-emitting diodes close to the sensor/actor indicate the
status of each channel.
The K-bus
End terminal
The K-bus is the path taken by data within the terminal row. The bus
coupler carries the K bus through all the terminals by means of six contacts
on the side walls of the terminals, and the end terminal terminates the K
bus. The user does not need to know anything about the function of the K
bus or the internal operation of terminals and bus couplers. There are
numerous software tools available which provide for convenient planning,
configuration and operation.
Power input terminals
for
Separately powered groups
Three power contacts pass the operating power to the following terminals.
You can use power input terminals to subdivide the terminal row as desired
into groups, each with a separate power supply. These power input
terminals are not taken into account for addressing the terminals, you can
insert them at any position along the terminal row.
You can install up to 64 terminals on a terminal row, including power input
terminals and the end terminal.
The principle of the bus
terminal
02 01
+ +
PE PE
WD
RX
TX
PLC
RS 485
B
E
C
K
H
O
F
F
24V 0V
0 9
8
7
6 5 4
3
2
1
0 9
8
7
6 5 4
3
2
1
K bus
End terminal
Galvanic
isolation
Potential
feed
terminal
Power
contacts
RS485
bus controller
BC 8000 Supply voltage
for the
bus controller
Additional characteristics of
the bus terminal controllers Bus terminal controllers (BC) differ from bus couplers (BK) in that, in
addition to K-bus processing, a real-time PLC task is also running. Unlike
bus couplers, the signals from the terminals are processed by the PLC
task, while the fieldbus carries the in- and outputs of the PLC task. It is
possible, however, to subdivide the terminals to that some terminals are
pre-processed by the PLC task, while others are sent directly over the
fieldbus to a supervising system.
Bus couplers for various
fieldbus systems Various bus terminal controllers can be used to couple the electronic
terminal strip with integrated PLC task quickly and easily to different
fieldbus systems. It is also possible to convert to another fieldbus system at
a later time. The bus terminal controller performs all the monitoring and
control tasks that are necessary for operation of the connected bus
terminals. The operation and configuration of the bus terminals is carried
out exclusively by the bus terminal controller. Fieldbus, K-bus and I/O level
are galvanically isolated.