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Master Production Scheduling (MPS) – Basic Techniques http://www. pom
Master Production Scheduling (MPS) – Basic Techniques lecture session 6 MPS: Role in the MPC System MPS Defined MPS Approaches Single Level MPS Time-Phased Record Customer Order Processing Rolling through Time (Transactions)
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Manufacturing Planning and Control System
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MPS Defined Anticipated Build Schedule – a statement of production not market demand The MPS is: Stated in terms of product specifications Concerned with product mix while Sales and Operations Planning is concerned with volume The MPS is the basis for: Making customer delivery promises Utilizing plant capacity effectively Attaining the strategic objectives in the sales and operations plan Resolving trade-offs between manufacturing and marketing
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MPS Approaches Make – to – Stock Make – to – Order
Assemble – to – Order
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Single Level MPS Record Example
The Zero Manufacturing Company ships Product A from the firm's plant warehouse to satisfy East Coast demand. Currently, the sales forecast for Product A at the Murphysboro plant is 30 units per period. Product A is considered a make-to-stock item. Plant warehouse on hand inventory = 50 units Safety Stock = 10 units Lot Size = L4L Open Order for 30 units due in period 1 The master production scheduler has heard that an MRP record which uses the forecast for gross requirements and has a lead time of zero can be used for master production scheduling. Complete the following MRP record. How can this be used for master production scheduling? 1 2 3 4 5 6 Projected available balance Planned order release Q = lot for lot; LT = 0; SS = 10 Period Product A Gross requirements Scheduled receipts
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Single Level MPS Record Processing
One way viewing an MPS is as the set of planned order releases and scheduled receipts in a record such as above. The problem is that any errors in forecast will be reflected in the on-hand balance. All changes will come in the planned orders. Use of firm planned orders will reduce this instability.
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Customer Order Promising Example
The MPS planner at Murphy Motors uses MPS time-phased records for planning end item production. The planner is currently working on a schedule for the P24. The production lot size is 70 and the safety stock is 5.
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Customer Order Promising Example
Complete the MPS time-phased record for P24. Can Murphy accept the following orders? Update the MPS time-phased record for accepted orders.
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Customer Order Processing Procedure
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Customer Order Processing Procedure
The convention of the greater of forecast or orders is used in determining the projected available balance.
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Rolling Through Time – Transactions Example
The following MPS time phased record has been prepared at the start of period 1.
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Rolling Through Time – Transactions Example
The following events occurred during period 1: Actual demand during period 1 was 25 units. Marketing forecasted that 40 units would be needed for period 9. An order for 10 in period 2 was accepted. An order for 20 in period 4 was accepted. An order for 6 in period 3 was accepted. The MPS in period 1 was produced as planned.
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Rolling through Time -Transactions/ Processing
Update the record below after rolling through time. Beginning On Hand Period 1 = 20 Period 1 Actual Demand = -25 MPS Receipt Into Stock =+50 Beginning on Hand Period 2 = 45
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