Allen-Bradley · Logix 5000 Advanced Process Control and Drives
The PATT instruction cannot take ownership of the equipment phase because it is currently in an unscheduled or inhibited state, or the task containing the equipment phase is inhibited.
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Verify the scheduling and inhibition status of the equipment phase — ensure it is scheduled and not in an inhibited state.
Check the status of the controller task containing the equipment phase — confirm the task itself is enabled and not inhibited.