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 Mode Selection

Use

The goal of mode selection is to utilize resources that have the same mode priority evenly.

Prerequisites

  • You have chosen the option mode selection for all operations in the Mode Selection field in the heuristic settings .

  • For the system to be able to choose a mode, you must have set the Finite Scheduling indicator for the resources.

Features

If you choose the option mode selection for all operations , the system chooses a new mode for all activities.

In the process, the system takes account of the mode priorities and the available capacity. That is to say, if the resource belonging to the mode with the highest priority has no more free capacity, the system chooses the mode with the next lower priority. If, for example, the resource of mode A is fully utilized, the system checks the utilization of the resource of mode B and chooses mode B for the activity.

If two resources have the same mode priority (e.g. mode priority A), these two resources are continually filled with operations in parallel until the system comes up against the today line. In the process, it may happen that an activity overlaps somewhat into the past. Conversely, it may happen that an activity does not quite reach the today line. Only when the resources with mode priority A are fully utilized does the system check the capacity of the resource with mode priority B and schedules the operations on B.

In the case of the last priority level, all operations are scheduled extending into the past. Only when the horizon is completely filled does the system deallocate the remaining operations.

If a resource is infinite, the system schedules all operations on this resource. Resources with a lower priority are then not used at all. If, for example, the resource with mode priority B is infinite and there is another resource with priority C, the resource with priority C is not scheduled.