UnitActiveState of virtual unit not working as per the manual

We have a redundant set of IO devices, when I use the Unit[x].UnitActiveState.Primary and Unit[x].UnitActiveState.Secondary parameters to try and see which IO device is communicating to the HMI.

When I disconnect the primary device, Unit[x].UnitActiveState.Primary changes between 1 and 0, but when I do the same to the secondary device Unit[x].UnitActiveState.Secondary stays as 0.  Any help would be appreciated.

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