sapPP模块介绍.ppt

Production Planning and Control Production Planning and Control Production Planning and Control Production Planning Process (1) Production Planning Process (2) Using MPS you can carefully plan important parts or bottleneck parts in a separate planning run at the highest BOM level before the planning results have an effect on all of the production levels. The central role of MRP is to monitor stocks and in particular, to automatically create procurement proposals for purchasing and production (planned orders, purchase requisitions or delivery schedules). This target is achieved by using various materials planning methods which each cover different procedures. Consumption-based planning is based on past consumption values and uses the forecast or other statistical procedures to determine future requirements. The procedures in consumption-based planning do not refer to the master production schedule. That is, the net requirements calculation is not triggered either by planned independent requirements or dependent requirement. Instead, it is triggered when stock levels fall below a predefined reorder point or by forecast requirements calculated using past consumption values. The lot-size calculation is carried out in MRP. In the net requirements calculation, the system determines material shortages for each requirement date. These shortage quantities must be covered by receipt elements. The system then calculates the quantities required for the receipts in the planning run in the procurement quantity calculation. In static lot-sizing procedures, the procurement quantity is calculated exclusively by means of the quantity specifications entered in the material master. Features The following static lot-sizing procedures are available: Lot-for-lot order quantity Fixed lot size Fixed lot size with splitting and overlapping Replenishment up to maximum stock level In period lot-sizing procedures, the system groups several requirements within a time interval together to fo