ABB DCS AC 460 S100 I/O

As per ABB AC460 configuration , analog input and out put card DSAX110 A designed to give shared equal o/p when they are connected in redundant configuration. We are facing problem of full o/p from each DSAX 110A card to DSTA0001B connection unit as result we are getting double O/P to the field.

Ex: PID O/P 8 mA (25%) getting 12mA (50%) out put

Could any one share the idea what could be the reason for this?
 
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