Study Notes of ERP starting from internal integration -- Chapter 1 Integration of material information 4th balance between demand and supply 4.5mrp without considering capability limitations

 

4.4 balance between demand and supply

The MRP principle emphasizes the principle of "demand-based supply" and "demand-supply balance". The calculation material demand plan only calculates the demand in each time period, and does not explain the possibility of realizing these demands. Therefore, the system has practical value only when the material requirements are taken into account and the capability resources to achieve the demand are taken into account to balance supply and demand. In reality, there are uncertainties in demand and supply (capability). Therefore, when balancing demand and supply, safety stock or safety lead time are often used as a buffer.

MRPThe system's execution layer also provides feedback on the implementation of the material plan through process tracking and completion reports. By analyzing the planned Input and Output hours and actual input and output hours of each work center provided by the system, the time quota of Capacity resources and the balance of material flow are assessed./Output workload analysis and control (Input/Output Analysis and Control), And constantly modify it to bring it closer to reality.

 

4.5mrpDo you not consider capacity limitations?

In some industries, Capacity resources cannot be changed, but can be expanded by various measures. For example, enterprises can outsource services if they can't do it themselves,1The device of the shift becomes3Class. These measures are the extension of capability resources, indicating that the capability can be "unrestricted" under certain conditions.

What are the problems with Capacity resources and actual capacity requirements when the customer requires the quantity and delivery time. If there is a problem, is it possible to take measures to expand the capacity resources to achieve a balance between supply and demand, and try its best to meet the customer's needs. This isMRPThe initial loyalty of the system to the ability plan is mainly for some discrete manufacturing industries.

All said,MRPIt is not "without considering the limitations of capabilities". On the contrary, it is based on the guiding ideology of "customer satisfaction as the center". The disadvantage is thatMRPThe method to balance the processing requirements and capabilities is not fast enough, and the operations are cumbersome, so you cannot quickly answer your questions.