X55 Customer Terminal Block; Overview - Siemens SINAMICS S120 Device Manual

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Power supply for the digital inputs

In the circuit example, the power for the digital inputs (terminals -X122 and -X132) is

supplied from the internal 24 V voltage of the Control Unit (terminal -X124).

The two groups of digital inputs (optocoupler inputs) each have a common reference

potential (reference ground M1 or M2). To close the circuit when the internal 24 V supply is

used, the reference grounds M1 / M2 are connected to internal ground (M).

If power is not supplied from the internal 24 V supply (terminal -X124), the jumper between

grounds M1 and M or M2 and M must be removed in order to avoid potential current loops.

The external ground must then be connected to terminals M1 and M2.

X55 customer terminal block

Cabinet Modules NEMA

Manual, 04/2014, A5E03586450A

Option G55, customer terminal block -X55

8.20 K90, Control Unit CU320-2 DP