Does anyone know if there is some sort of system status bit to indicate that discrete coil has been disabled in Quantum PLC, so I can send indication to SCADA?

 

In 984 LL there is a loadable, called DISA. This will give you information regarding the forced in or outputs, if any. Ask your nearest Schneider office to provide the loadable and/or the corresponding PDF manual.

In IEC language ther is no way.

 

If you use Unity, and an EBOOL, you can get the information.

 

The way is used Concept EFB Toolkit.

 

I know it is way late to answer but:
Schneider Electric Customer Services developed
DISA EFB for Unity and Concept languages.
You may inquire at:
frank.prendergast (at) us.schneider-electric.com