Issue
ABB drives connected to UNC-520 on BACnet MS/TP network do not update automatically; an upload needs to be performed in order for the points to be updated.
Environment
I/A Series R2 BACnet, all versions
Cause
By default, R2 sets the readPropertySupported flag to True. ABB drives do not support the Read Property Multiple feature.
Resolution
In R2, in the Properties of the BACnet device, set the readPropertySupported flag to False.