Program management module in the ERP, enterprise PMC sector-related planning staff will make relevant material requirements planning (MRP) and master production schedule (MPS), I will first describe the general process of MRP computing, ERP system, material requirements planning is through the BOM of low-level code started to operation, in operation prior to first understand the following terms MRP: low-level code, independent demand, the relevant requirements; the total demand (sales orders, sales forecasts), inventory, safety stocks, temporarily closed capacity, in-transit amount (planned in transit, purchasing in-transit, manufacturing, in-transit), the amount allocated was replaced volume, replacement rate, alternative priorities, plan inventory, the net demand for such basic concepts, its calculation formula:
Net demand = total demand - the amount of inventory safety stock quantity + - temporary income the amount - the amount of + has been assigned in-transit traffic - the amount being replaced
This is the ERP system, the calculation of material requirements planning process, if you want the results of computing an accurate, we must guarantee that the process of data accuracy, which is why many companies can not really run smoothly MRP calculated.
MPS operation process
In the ERP program modules, corporate PMC department will make the relevant Material Requirements Planning (MRP) And the master production schedule (MPS), The previous paragraph has been talked about material requirements planning (MRP), the MPS to describe the computing process, the basic use of the existing ERP are an infinite capacity scheduling method, through the lead time (procurement lead times, production lead time) + rest day operations involved in reversing MRP introduce a scheme to issue (production planning, procurement plans) the date, this is only a rough capacity requirements planning; But for enterprises, the production is basically fixed (equipment and personnel are fixed), we must also consider the capacity of our system, the plan can meet the schedule, so we have to identify each plant's total effective hours of work per day, each product in each process of the single-piece processing time, lead time, etc., the system calculate had arranged for the production of the work out of the master plan for a single consumption of man-hours, and the total effective hours of work per day compared to determine whether the ultra-short production consumption, ERP system, best to see what programs work to keep a single occupancy of these hours, only the case in order to work on the super-consumption for scheduling a single adjustment, so that our schedule is feasible, that is, small capacity planning.
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