Siemens SIMATIC S7-1500 Equipment Manual page 51

NOTE
An open input is interpreted as "low".
So that the digital inputs will function, connect terminal M1 or M2. The alternatives are as
follows:
• Connect the coupled reference ground of the digital inputs to M1 or M2.
• Connect a jumper to terminal M and terminal M1 (or between M and M2).
This removes the electrical isolation for these digital inputs.
Pin assignment of X142 interface
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
1)
DI/DQ: Bidirectional digital input/output; M: Electronic ground
2)
B = Bidirectional; GND = Reference potential (ground)
Power supply for X142 digital inputs/outputs
If you use the X142 digital inputs/outputs partly as inputs and partly as outputs (mixed
operation), you need to supply the digital inputs over the same power supply as the SIMATIC
Drive Controller (X124 module supply).
This restriction does not apply if you operate the X142 digital inputs/outputs exclusively as
inputs or as outputs.
The X122/X132 digital inputs/outputs are not affected by this restriction.
SIMATIC Drive Controller
Equipment Manual, 11/2022, A5E46600370-AC
1)
Designation Signal type
– –
– –
DI/DQ0 B
DI/DQ1 B
M GND
DI/DQ2 B
DI/DQ3 B
M GND
DI/DQ4 B
DI/DQ5 B
M GND
DI/DQ6 B
DI/DQ7 B
M GND
4.4 Digital inputs and outputs of X122, X132 and X142
2)
Notes
Reserved
Reserved
Digital input/output 0
Digital input/output 1
Ground for digital input/output
Digital input/output 2
Digital input/output 3
Ground for digital input/output
Digital input/output 4
Digital input/output 5
Ground for digital input/output
Digital input/output 6
Digital input/output 7
Ground for digital input/output
Connecting
51