Siemens S120 Manual page 277

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Permissible voltage values at the analog input

The common-mode range must not be violated in order to avoid incorrect results of the

analog-digital conversion. This means that the analog differential voltage signals can have a

maximum offset voltage of +/- 15 V with respect to the reference potential.

A 24 V supply must be connected to terminal X124 for the digital outputs to be used.

If momentary interruptions in the voltage occur in the 24 V supply, the digital outputs are

deactivated until the interruption has been rectified.

Manual, (GH6), 04/2014, 6SL3097-4AL00-0BP4

Control Units, Control Unit Adapters and operating components

7.3 Control Unit CU310-2 PN (PROFINET)