Siemens Metro 21 M216KA Operator's Manual page 230

Distributed i/o device
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SC Analog Electronic Modules – Parameters
11.18 Wiring Unused Analog Output Modules
11-28
To avoid faults, you must wire unused channels of analog output modules as
follows:
In the case of analog output modules for voltage:
Insert a bridge between QV+ and S+ and between QV– and S– .
In the case of analog output modules for current:
No wiring is required.
ET 200L, ET 200L-SC and ET 200L-SC IM-SC Distributed I/O Device
EWA 4NEB 780 6009-02c

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