| # Simulate and Create Line Sequences (tiasl4200m000) Use this session to generate a sequence of assembly orders for an assembly line. The sequence of orders is generated based on the line mix created in the Assembly Control module. You can display the line mixes in the Assembly Line - Line Mix (tiasc2501m000) session. The orders that are part of the line mix are sequenced using sequencing rules. The sequencing process aims to produce the most efficient order sequence. Each time ERP LN performs a sequencing run, the cost of the outcome of the run is displayed in this session. For details of the sequencing process, refer to Line sequencing and rule types in Assembly Control. Parameters You must set several parameters, such as how many sequence runs ERP LN makes for each assembly line, in the Remix/Sequence Parameters (tiasl4110m000) session. The parameters that you define are linked to an assembly line, and are specific to your logon code. Procedure To generate line sequences, you must perform the following procedure. The procedure is an outline, and does not describe all the options available. Select options for sequencing, such as Backlog, Confirm Sequence. Select the assembly line, sequence offline dates, line segments, and pivot segment in the Sequence Selection box. Click the Generate button to generate a sequence run for your selection. The results are shown in the Sequence Quality box in terms of costs. Repeat step three until there is no significant improvement in the cost, or until you are satisfied with the results. Click the Evaluate button to print a report that shows the order sequence and the order option combinations. You can do up to 25 runs. When you click the Confirm button, ERP LN offsets the orders at line segment level and selects the Offsetting Required check box, that is displayed in the Line Segment - Line Sequence (tiasl4500m000) session, for offsetting at line station level. Furthermore, ERP LN logs all error and warning messages. The quality of each run is shown in the Sequence Quality group box. You can see the results of previous or subsequent sequencing runs if you click the Up or Down buttons. After running this session, offset the orders at line station level in the Offset Line Station Orders (tiasl4230m000) session. Note The reference date is used to determine when the content of an order is valid. The content of an order consists, among other things, of the required materials and operations. Therefore, if the offline date falls before the reference date, problems can occur, because the production is based on an order content that is not yet valid. For example, a certain feature of the product cannot yet be produced at that time, because the required machines are not yet operative. If, after you confirm a sequence, it appears that an order's offline date falls before the order's reference date, ERP LN shows a message to warn you for such situations. The current session generates two sequences: The Actual sequence, which cannot be modified in the Remix Line Mix (tiasl3220m000) session. The Generated sequence, which you can modify in the Remix Line Mix (tiasl3220m000) session. You can display the sequences generated by the current session in the Line Segment - Line Sequence (tiasl4500m000) session. Related topics Assembly control overview Line sequencing and rule types in Assembly Control Line station variants and line station orders Assembly order costing Assembly backflushing Assembly line station utilization Assembly orders Sequence Options Local Improvement If this check box is selected, ERP LN only optimizes the sequence for the segment selected in the Pivot Segment field. You can also select the Neighbor Checking check box to optimize the sequence for a segment. Neighbor Checking If this check box is selected, ERP LN takes account of the segments immediately before and after the specified segments during the optimization process. This gives rise to a sequence that is translatable to the neighbor segments, which means that the sequence changes are feasible. You can only select this check box if the Local Improvement check box is selected. If the Global Improvement check box is selected, ERP LN automatically selects the current check box. Global Improvement If this check box is selected, ERP LN optimizes the sequence for all the segments that you select in this session. Offsetting Options Backlog If this check box is selected, ERP LN takes backlog into account when it calculates offset. That means that the first order is planned at the beginning of the period you specify in this session. Actual Times If this check box is selected, and ERP LN calculates the offset, it takes into account when the last order was reported completed on the last line station of a segment. Next time you run this session to replan a line sequence, ERP LN takes the difference between planned end time and actual end time into account. Generation Options Confirm Sequence If this check box is selected, the sequence that ERP LN generates is confirmed automatically. The orders in the sequence are offset and the planning data for ASC orders, such as segment start time and segment end time, are calculated. If this check box is cleared, you can confirm the sequence when you click the Confirm button, after you select the run number of a previously generated sequence. Sequence Selection Assembly Line The assembly line that you want to sequence. Pivot Segment The segment for which you have defined parameters in the Remix/Sequence Parameters (tiasl4110m000) session and from which ERP LN starts generating sequences. If you sequence multiple segments, ERP LN sequences the pivot segment first. This segment is then copied to the other segments within the range, and the segments are then sequenced. If you selected the Global Improvement check box, this is the segment for which you defined parameters. You can switch to different parameters by entering a different pivot segment in this field. Note You must carefully select a segment that is representative of your assembly line. You can simulate line sequences for your assembly line with various different segments as the pivot segment, to see which gives the most efficient sequence. Line Segment A set of consecutive assembly-line work centers on an assembly line between two buffers. The first buffer is the beginning of the segment, the next buffer is the first part of the next segment. Sequence Date The actual offline date of new orders which are taken into account and added to the sequence in the sequencing process. ERP LN always takes previously sequenced orders into account, irrespective of the date range you specify in this field. Sequence Quality Run Number The identification number of the sequencing run. To see results of other run numbers, click the Up or Down button. Penalty Cost Theoretical costs for not meeting rules on an assembly line. Convertible Indicates whether the sequence is translatable between the different segments of the assembly line. Sequence Progress Initialize Sequence The value of this field indicates whether a sequence was initialized, by adding a new assembly order, for the selection you made in this session. Initial Penalty Cost Penalty cost of the sequence before optimization has taken place. Selected Sequence The run number of the selected run. Generate Generates the sequence. Evaluate Prints a report that shows the order sequence and the order option combinations for each segment of the selected run number. Confirm Permanently stores the order sequence of the selected run number. Parameters Starts the Remix/Sequence Parameters (tiasl4110m000) session. Messages Displays error messages and warnings. Up Click to see results of a previous run. Down Click to see results of a later run. |