BECKHOFF BC3100 - Manual (Page 7)

Basic information
BC3100 7
The PLC task continues running as an autonomous system if the exchange
of data via the field bus should temporarily fail.
The interfaces
There are six ways of making a connection to a bus terminal controller.
These interfaces are designed as plug connections and spring terminals.
The
Profibus controller
BC3100
02 01
+ +
PE PE
RUN
BF
DIA
PROFIBUS
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
00 X0
BC
31
00
Power LEDs
Bus coupler / power contacts
K-bus
Profibus
Configuration
port
Power supply bus coupler
24 V DC / GND
Input
power contacts
power contacts
x1
x10
Power supply
24 V DC on the topmost
terminals The bus terminal controllers need an operating power of 24 V DC which is
connected via the topmost spring terminals, labeled "24 V“ and "0 V“. This
power supply serves not only the electronic components of the bus
terminal controller but (via the K bus) also the bus terminals. The power
supply of the bus terminal controller circuitry and that of the K-bus
(Terminal bus) are electrically isolated from the voltage of the field level.
Power supply to the power contacts
Lower 3 terminal pairs for
power input
maximum 24 V
maximum 10 A The six lower connections with spring terminals can be used to supply
power to the peripherals. The spring terminals are connected in pairs to the
power contacts. The power supply to the power contacts has no
connection to the power supply of the bus couplers. The power input is
designed to permit voltages up to 24 V. The pair-wise arrangement and the
electrical connection between the feed terminal contacts makes it possible
to loop through the wires connecting to different terminal points. The load
on the power contact may not continuously exceed 10 A. The current
capacity between two spring terminals is the same as the capacity of the
connecting wires.
Power contacts
Spring contacts at the side On the right-hand side face of the BC3100 are three spring contacts which
are the power connections. The spring contacts are recessed in slots to
prevent them from being touched. When a bus terminal is connected, the
blade contacts on the left-hand side of the bus terminal are connected to
the spring contacts. The slot and key guides at the top and bottom of the