Resource reallocation during interruptions
When a load of items on a job is being processed, it usually completes an operation and moves on to the next one in the routing. However, three situations can interrupt the load from being processed at an operation:
- End of a shift
- Start of a shift exception
- Start of a holiday period
Regardless of the cause, these things happen when the load is interrupted:
- Operation processing for the load stops.
- The resources that have gone off-shift become unavailable.
- All other resources allocated to the load remain allocated.
The system keeps track of each unavailable resource for the load. Once interrupted at an operation, a load must wait to resume operation processing until the system can again allocate all of the load’s needed resources.
The Reallocate option on the Resource Group (RGRP.REALLOCFG) and the Allocation status on the Resource (RESRC.ALLOCCD) allow you to control the situation of losing a resource due the conditions described above. The diagram below illustrates the combinations of the two options:
![](sfo1487326438199.png)
- Reallocate selected: The load frees the resource and tries to reallocate a resource from the same resource group. Any member of the resource group may serve as a substitute for the unavailable resource on this operation. The Scheduler does not consider the permanent/temporary state of the resource if Reallocate is selected on the resource group.
- Reallocate not selected: The load can wait until that
specific resource is available. The setting of the original resource’s
Allocation option determines whether the load reserves that resource or must
compete with other loads to reallocate it.
- Allocation=Permanent: To resume processing at the operation, the interrupted load must regain the unavailable resource. It cannot allocate any other resource, and only this load can allocate the resource. Reallocation takes place when the resource becomes available, whether reallocation of any other needed resources succeeds or fails.
- Allocation=Temporary: The interrupted load must regain the unavailable resource to resume operation processing. No other resource can substitute. The interrupted load must compete with other loads for the unavailable resource when it becomes available. The system places the load in the resource’s request queue. Reallocation occurs only when the needed resource becomes available and when the interrupted load’s request is selected.
You will usually enable the Reallocate field for groups that contain crew resource types working on different shifts, but not for machine resource types.