Setup time optimization (SAP Library - Capacity Leveling (PP-CRP-LVL))

Setup time optimization

Use

With automatic dispatching with setup time optimization, you can dispatch a group of operations on the capacity planning table without leaving any gaps while minimizing the setup time at the target work centers. This dispatching procedure is especially suitable for the initial commitment of resources.

Note

This function is not available for capacity leveling in the process industry (PP-PI), that is, for capacity leveling of process orders and planned orders that refer to master recipes.

Prerequisites

You must activate Setup time optimization in the strategy profile. This automatically activates or deactivates the following functions:

Planning direction forwards	is activated
Dispatch at best time for setup	is deactivated
Dispatch at earliest point in time	is deactivated
Date entry when dispatching	is deactivated

To calculate the setup time of the operation, the function uses the value stored in the setup matrix for the transition between the predecessor of the operation and the operation itself. This value serves as the standard value for setup. It is here that you specify which standard value of the operation is used as the setup standard value.

If you do not maintain the setup matrix or if a setup transition is not specified in the setup matrix, then the setup standard value in the operation is used. In the control profile, you specify globally for all operations which standard value is to be treated as the setup standard value.

In the setup matrix, a setup transition is identified by setup states that are defined in the preceding and subsequent operations for the work center. Setup states are defined in terms of setup group categories and setup group keys. These must be maintained in the operations.

Activities

Procedure and results of setup time optimization

For every target work center, the operations to be dispatched are first of all automatically arranged in the sequence with the smallest total setup time. The system takes the initial setup state of the work center into account. It also takes account of forbidden setup transitions. Then the operations are dispatched to the work center in this sequence without any gaps and with the new setup times. The setup standard values in the operations dispatched are overwritten with the setup standard values from the setup matrix.

If you deallocate the operations again, they are given back their original setup values so long as you have not saved your planning.

Dispatching date

There are the following options for the dispatching date:

If there is already a commitment at the work center, then the operations to be dispatched are dispatched directly after the last operation at the end of the commitment without any gaps.

If there is no commitment in the evaluation period at the work center, then the operations are dispatched at today’s date.

Specification of the initial setup state of a work center

If there is no commitment at the work center in the evaluation period, then the setup state at the work center is not defined by an operation.

You can define the initial setup state by entering an Initial setup state in the strategy profile. The setup time of the first operation is calculated using the standard value saved in the setup time matrix for the transition between the initial setup state and the setup state given for the operation. If you do not specify an initial setup state in the strategy profile, the setup time of the operation is calculated using the setup standard value in the operation.