Conditions

An I/O connection can be lost under these conditions:

Condition

CPU

140CRP31200

Adapter Module (140CRA31200 or BMXCRA312•0)

  • Perform a hot swap.

  • Replace a module of the same type.

X

X

X

There is no remote I/O cable connection.

  

X

X

The I/O connection is closed.*

    

X

*Hot swap of the CPU results in an explicit close (lost I/O connection).

Remote Adapter Fallback

In some instances, the 140CRA31200 or BMXCRA312•0 adapter module on the remote I/O drop can lose I/O connections for a period longer than the configured hold up time. During the hold up, the adapter tries to get IP and configuration parameters from the 140CRP31200. If the adapter does not obtain those parameters, it gets these results:

  • inputs: retain last known values

  • outputs: set to fallback

NOTE: Configure the hold up time on the Control Expert Parameter tab.