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Rules for wiring
• To wire the digital input/output, use a copper cable of category AWG18-16 or a cable with a
cross-section of 0.75 to 1.5 mm
• Always wire the digital input/output in pairs.
• The maximum permitted cable length is 3 m.
Position / Assignment
Example:
1
2
3
4
5
If there is an adequate switching voltage at the digital input, the digital input is active and
the "DI" LED is lit.
The voltage applied to the "DI" contact is converted to a digital status by the device as follows:
Voltage
-30 to +3 V DC
+10 to +30 V DC
The digital output is a switch that switches the signal at +DO to ‑DO.
SCALANCE MUM856-1
Operating Instructions, 02/2023, C79000-G8976-C628-05
2
.
DI-
Ground
DO-
Ground
DO+
Switching signal
DI+
Input
NC
Not connected
Status
0
1
Connecting up
5.7 Digital input/output
53
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