Occasionally, during setup or normal operation of the DeltaV system,
one or more channel wires can become loose and cause an open channel fault.
Open channel faults cause a switchover in Series 2 redundant DO cards. To
correct this issue:
Open DeltaV Diagnostics (click
Start → DeltaV
Operator → Diagnostics).
Select the card from the I/O subsystem in the left pane in
Diagnostics.
In the right pane, read the Status and OInteg parameter values for
all channels to determine if there is an open connection. Look for values, such
as Status = Bad – Hardware Error and OInteg = Bad, Pair Status – Possible Field
Problem.
Fix any wiring problems on the card.
In Diagnostics, right-click each card, and then select
Clear Saved Fault Information.