BECKHOFF BK3000 - Manual (Page 12)

Basic information
12 BK3xxx/LC3100
Mechanical construction
The Beckhoff bus terminal system is remarkable for its compact
construction and high degree of modularity. When you design the
installation you will need to plan for one bus coupler and some number of
bus terminals. The dimensions of the bus couplers do not depend on the
fieldbus system. If you use large plugs, for example like some of the bus
plugs used for the Profibus, they may protrude above the overall height of
the cabinet.
Dimensions of a bus
coupler
02 01
+ +
S S
A B
00 X0
LC3100
Beckhoff
21
02 02 01 01
+ + + +
PE PE PE PE
RUN
BF
DIA
PROFIBUS
B
E
C
K
H
O
F
F
24V 24V 0V 0V
0 9
8
7
6 5 4
3
2
1
0 9
8
7
6 5 4
3
2
1
BK
3
00
0
1
0
0
9
4
47 12
The overall width of the construction is the width of the bus coupler,
including the bus end terminal, plus the width of the installed bus terminals.
The bus terminals are 12 mm or 24 mm wide, depending on their function.
The LC3100 has a width of 21 mm and the terminals then follow, as on the
coupler.
Depending on the gauge of cables used the overall height of 68
mm may be overstepped by about 5 mm to 10 mm by the cables at the
front.
Assembly and connections
Maximum number of
terminals
It takes only a slight pressure to latch the bus coupler and the various bus
terminals onto a supporting 35mm C rail and a locking mechanism then
prevents the individual housings from being removed. You can remove
them without effort if you first release the latching mechanism by pulling the
orange tab. You should carry out work on the bus terminals and the bus
coupler only while they are switched off: if you plug or unplug components
while the power is on you may briefly provoke some undefined state (and,
for instance, reset the bus coupler).
You can attach up to 64 bus terminals in series on the right-hand side of
the bus coupler. When you assemble the components, make sure that you
mount the housings so that each slot comes together with the
corresponding key. You cannot make any functional connections merely by
pushing the housings together along the supporting track. When they are
correctly mounted there should be no appreciable gap between the
adjacent housings.
The right-hand side of a bus coupler is mechanically similar to a bus
terminal. There are eight connections on the top which can be used to