Books and notes on ERP starting from internal integration -- Chapter 1 time concept of MRP system 5th Early Stage

5.2 Early Stage

The material demand plan is a demand-oriented reverse plan based on the delivery date or completion date to calculate the start date of the work or the order release date; the time span in this period is called the "lead time", which means the number of times in advance to start the action and the countdown.

MRPIn the system, there are3Layers.

The time for signing a customer's order to deliver the goods to the customer is called "total lead time ".Total lead time", You need to control the entire process, that is, the" planning period "mentioned above ".

The process from procurement to product assembly and testing is called "accumulative lead time ".(Cumulative lead time)"Is the total time to complete the procurement and processing operations (procurement lead time and processing lead time), is the basis for setting the plan.

the production and processing cycle part of the accumulative advance period is called" pre-processing (manufacturing lead time) ", it is the benchmark for splitting the processing job time.