BECKHOFF BC7300 - Manual (Page 12)

Basic Principles
BC7300 12
Dimensions of a Bus
Coupler in mm
02 02 01 01
+ + + +
PE PE PE PE
RUN
RX
TX
MODBUS
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
BC
7
30
0
1
0
0
9
4
47 12
PLC
The total width in practical cases is composed of the width of the Bus
Coupler with the bus end terminal and the width of the Bus Terminals in
use. Depending on function, the Bus Terminals are 12 or 24 mm wide. The
front wiring increases the total height of 68 mm by about 5 to 10 mm,
depending on the wire thickness.
Assembly and connection
The Bus Coupler and all the Bus Terminals can be clipped by light
pressure onto a 35 mm C-mounting rail. A locking mechanism prevents
the individual housings from being pulled off again. For removal from the
mounting rail the orange coloured tension strap releases the latching
mechanism, allowing the housing to be pulled off the rail without any force.
Work should only be carried out on the Bus Terminals and the Bus Coupler
when switched off. Pulling out and inserting under power can cause
undefined states to be temporarily caused. (A reset of the Bus Coupler, for
example).
Maximum number of
terminals Up to 64 Bus Terminals can be attached to the Bus Coupler on the right
hand side. When plugging the components together, be sure to assemble
the housings with groove and tongue against each other. A properly
working connection can not be made by pushing the housings together on
the mounting rail. When correctly assembled, no significant gap can be
seen between the attached housings.
The right hand part of the Bus Coupler can be compared to a Bus
Terminal. Eight connections on the top permit connection with solid or fine
wires. The connection is implemented with the aid of a spring device. The
spring-loaded terminal is opened with a screwdriver or rod, by exerting
gentle pressure in the opening above the terminal. The wire can be
inserted into the terminal without any force. The terminal closes
automatically when the pressure is released, holding the wire securely and
permanently.
The connection between the bus coupler and the bus terminals is
automatically realised by pushing the components together. The transfer of
the data and the supply voltage for the intelligent electronics in the Bus
Terminals is performed by the K-Bus. The supply of the field electronics is
performed for the digital Bus Terminals through the power contacts.