Siemens SCALANCE W788

Connecting up
5.5 Digital input/output
SCALANCE W788-x / W748-1
Operating Instructions, 09/2017, A5E03678333-12
45
5.5
Digital input/output
A digital input/output is only available with the RJ-45 variants.
The digital input/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 (input ground)
-