Partial Import Online (PIO)

If you select Import Logix Edits as Pending or Accept Program Edits when executing a PIO, the primary controller treats the PIO feature as a set of multiple test edits where, after the import is complete, you can switch between testing the edits or not.

We recommend that you do not use Finalize All Edits in Program when you import edits. If you use this option, any failure due to the import causes a failure on the new primary controller after a switchover. If the new edits cause the controller to have a major fault, both controllers experience the major fault, resulting in loss of control.

If edits exist in the primary controller due to a PIO, they are treated the same as normal test edits regarding the ‘Retain Test Edits at Switchover’ selection and Redundancy System Update.

If a PIO is in progress, the primary controller rejects any attempt to qualify.

If you initiate a PIO on a primary controller during the qualification process, the PIO is rejected.

If a switchover occurs while the PIO is still in process, a PIO to the new primary controller can fully end or fully complete. The result depends on the progress of the PIO at the time of switchover. If the PIO does not complete due to the switchover, reattempt the PIO after the system has synchronized.

Plan for test edits

Assemble edits with caution