Connecting up
6.5 Digital input/output
SCALANCE W788-x / W748-1
Operating Instructions, 03/2022, A5E03678333-17
57
6.5
Digital input/output
A digital input/output is only available with the RJ-45 variants.
The digital output (relay contact) is a floating switch with which error/fault states can be
signaled by breaking the contact.
NOTICE
Damage due to voltage being too high or too low
The voltage at the digital input/output must not exceed 30 VDC and not fall below -30
VDC, otherwise the digital input/output will be destroyed.
The digital input/output is connected to a 4-pin plug-in terminal block with the following
pin assignment:
Pin
Signal
Function
1
DQ (output)
Relay 24 VDC / 1 A
2
1L (output)
Relay 24 VDC / 1 A
3
DI (input plus)
24 VDC
4
1M (ground)
-
6.6
Grounding
Grounding
The device has a grounding connector on the back of the device (screw M4), see position
①
in the drilling pattern (Page 41). Connect the grounding cable before you mount the
device. Refer to the information in the section Installation and removal (Page 37).
