Siemens SINAMICS S120 Manual page 453

NOTICE
Ensuring the function of digital inputs
An open input is interpreted as "low".
To enable the digital inputs (DI) to function, terminal M1 must be connected.
This is achieved by:
1. Providing the ground reference of the digital inputs, or
2. A jumper to terminal M (Notice! This removes the electrical isolation for these digital
Note
Brief voltage interruptions
If the 24 V supply is briefly interrupted, then the digital outputs are deactivated during this
time.
Cabinet Modules
Manual, 03/2013, A5E03263538A
inputs.)
8.22 K95, Control Unit CU320-2 PN
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