Sequencing (PP-FLW)

Purpose

You can use this component for sequencing and for the takt-based scheduling of planned orders in an assembly line and repetitive environment.

Using takt-based scheduling, you can plan a large number of orders as you access the data source of Line Design. In takt-based scheduling, the system multiplies the rates or the takt times by the number of takts of the production line. No lead time scheduling via the routing is carried out. Moreover, in assembly-line production, takt-based scheduling provides a more accurate result than lead time scheduling as the materials remain for the takt time at a line segment or a takt to be processed.

Implementation considerations

You can use Sequencing for make-to-order REM (repetitive manufacturing) and for make-to-stock REM and plan planned orders with an order quantity of your choice. Sequencing is suitable for takt-oriented assembly line and repetitive manufacturing where exactly one unit of measure is produced per takt.

Integration

  • Sequencing is included in the functions of Repetitive Manufacturing.

  • You define the master data for Sequencing in Line Design . Here, you determine the takts and times for scheduling. You can also define sort buffers in the line hierarchy. Using sort buffers, you can change the sequence of the planned orders in the production line and define several line segments which you want to display graphically as visualization segments in the sequence schedule.

  • You can use Sequencing alone as your planning tool for repetitive manufacturing or you can use it in conjunction with the planning table. In the planning table, you can create planned orders and assign them to the production lines. The planned orders are then dispatched and scheduled (takt-time scheduling) in Sequencing . You can access Sequencing from the planning table to display planning results in a graphic.

Features

  • The sequence schedule displays the sequence of the orders for the finished products for a production line in graphic form. You can display the exact load of a line or of a line segment with the precise time specifications. The sequence schedule displays the orders per day on a folded time axis so that you can see as many orders as possible per day or per shift on the screen at the same time.

  • You can display the order sequence in the planning view or in the control view. In the planning view, you can monitor the order sequence over a longer period. In the control view, the system displays which orders are at which line segment at a certain time. Therefore, this view is especially useful for repetitive manufacturing with reference to sales orders.

  • You can determine the order sequence using various processes. For example, you can plan them manually or you can instruct the system to plan them automatically using a first-in-first-out process. You also have the option of using external optimization or model-mix processes via the interface (POI) or a user exit.

Note Note

You can add sort buffers to the line hierarchy in Line Design. Sort buffers split the production line into buffered sections. You can use a different planning process for each buffered section. The sequence of the materials can change in the sort buffer.

End of the note.

  • Using different rates or takt times, you have a great degree of flexibility in controlling sequencing. You define the rates and takt times in Line Design.

  • You can display information for the planned orders graphically. To do this, you must define and assign order characteristics (up to three order characteristics) in Customizing for Sequencing. For example, you can use colors to differentiate whether the availability check has already been carried out for an order or not.

Constraints

  • Sequencing is not suitable for production systems which are not based on production rates and takts or for takt-oriented production systems in which more than one unit of measure per takt is produced.

  • Sequencing is not a tool for production control as when planning the sequences, you cannot take events, such as machine breakdowns, into account.

  • Sequencing does not take the feeder lines into account in takt-based scheduling.