Meaning
Time-phased logic engines calculate component requirements and purchase schedules based on master production schedules and inventory balances. Material requirements planning translates finished product demand into actionable procurement and manufacturing orders. The system governs inventory replenishment and production scheduling across industrial manufacturing.
It stops applying when production scheduling transitions to pure kanban pull systems.
Calculation Engine
Software algorithms explode end-item demand down through complex product structures to calculate gross component requirements. Deducting on-hand stock and scheduled receipts yields net requirements, which are then grouped into planned orders based on lot-sizing rules. Transitioning from prototype production to full commercial scale requires accurate lead time data and realistic supplier delivery commitments.
Inaccurate master data causes the calculation engine to generate premature order recommendations or severe stock shortages.
Schedule Integration
Planning engines align raw material deliveries with shop floor capacity plans. Order action messages alert buyers when to release or expedite purchase orders based on changing demand forecasts.
System Limitation
Traditional planning logic assumes infinite capacity across work centers during material calculation runs. Real-world bottlenecks require planners to validate material schedules against finite capacity limitations before releasing work orders. Overlooking capacity constraints leads to excess work-in-progress inventory and extended manufacturing lead times.
