Interfaces & connections
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Mounting and Installation, Technical Description, T 811 065 en
3.6.5
BX-IM4 input module connection
The BX-IM4 has 4 primary inputs for polling potential-free contacts. These inputs monitor the lines for creeping wire breakage
and short-circuit. The “monitored” or “unmonitored” operation mode is separately planned for each input; further, each input
can be programmed inverted.
More information about the BX-IM4 can be found in the data sheet T 131 462.
Monitored inputs
GND
SHLD
SHLD
GND
L1
L2
X2
IN4+
IN3+
IN2+
IN1+
IN4-
IN3-
IN2-
IN1-
X1
BX-IM4
1
1
Input 3
Input 1
Input 4
Input 2
Input 4
input 1
max. 30 m
180
Ω
1
8
0
Ω
180
Ω
1
8
0
Ω
S
H
L
D
S
H
L
D
L
1
L
2
G
N
D
G
N
D
Fig. 23 BX-IM4, monitored inputs
Unmonitored inputs
GND
SHLD
SHLD
GND
L1
L2
X2
IN4+
IN3+
IN2+
IN1+
IN4-
IN3-
IN2-
IN1-
X1
BX-IM4
1
1
Input 3
Input 1
Input 4
Input2
Input 4
Input 1
max. 30 m
S
H
L
D
S
H
L
D
L
1
L
2
G
N
D
G
N
D
Fig. 24 BX-IM4, unmonitored inputs
