Connecting up
3.5 Digital input/output
SCALANCE M874, M876
Operating Instructions, 06/2015, C79000-G8976-C331-05
37
The digital input/output (relay contact) is a floating switch with which error/fault states can be
signaled by breaking the contact.
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 2-pin terminal block has the following assignment:
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