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 Optimizing Subsets

Usage

You use this function in the sequence schedule to optimize a selected subset of orders that are scheduled one after another in a shift again: You do this to create an improved order sequence for these orders.

Integration

The system can only consider the following restriction categories when optimizing a subset:

  • Block Restriction

  • Equal Distribution Restriction

  • Spacing Restriction

  • K-in-M Restriction

    Note Note

    The system cannot take quantity and position restrictions into account as these restriction categories are always defined with reference to a shift or a day. These restrictions are deactivated in the Procedure Parameters dialog box when accessing the optimization algorithm.

    End of the note.

Prerequisites

  • You have called up the sequencing in change mode .

  • You have selected the required orders. You can only select orders that are scheduled one after the other; this means that there cannot be any gaps between the individual orders.

  • The orders must have the scheduling status Scheduled or Scheduled and Fixed . Fixed orders are taken into account during optimization but are no longer rescheduled.

    You cannot optimize orders that have already been released , started , or partially confirmed .

Features

The system transfers the selected orders to the optimization. The system then carries out optimization according to the procedure you defined. The optimization results are then transferred to sequence scheduling. The position of the fixed orders is retained. All relevant messages are displayed in the optimization log .

The optimization of subsets has the following advantages in contrast to the optimization of a complete shift:

  • Improved optimization results as fewer restrictions are violated for smaller order sequences.

  • Improved performance in interactive sequence scheduling as only the selected orders must be transferred to optimization in contrast to the entire order sequence of a shift or a day.

  • Shorter optimization runtime

    Caution Caution

    It is possible that some restrictions are violated by the selected orders. This can affect orders in the optimized subset as well as those that are scheduled directly before or after the subset. A subset that violates certain restrictions can negatively influence the quality of the entire order sequence in a period. A period can cover a shift of up to several days. However, this may also occur when optimizing a complete shift. Here, the orders that lie close the neighboring shifts can also violate certain restrictions.

    End of the caution.

Activities

  1. Select the planned orders to be optimized.

  2. Call up the Optimization function key and choose an optimization procedure .

    The system displays the dialog box containing the parameters for the selected procedure.

  3. Check the optimization parameters or change the proposed settings, and choose Continue .

  4. The system starts the optimization.