Siemens SCALANCE MUM853-1 Operating Instructions Manual page 58

Connection
6.6 Digital input/output
The voltage applied to the "DI" contact is converted to a digital status by the device as follows:
Voltage
-30 to +3 V DC
+13 to +30 V DC
Digital output
The 2-pin terminal block has the following assignment:
Contact
+DO
-DO
The output is a switch that switches the signal at +DO to ‑DO.
58
Status
0
1
Assignment
Switching signal
Relay 24 V DC / 0.5 A
Ground
Operating Instructions, 03/2023, C79000-G8976-C650-05
SCALANCE MUM853-1