Originally a computer-assisted method for preparing material requirements planning, it was only proposed to improve the traditional inventory planning to control materials. Since the advent of the 1960s, especially with the increase of computer data computing, processing power and storage capacity, people have realized that MRP should no longer be a simple inventory management tool. After continuous practice and research, the so-called MRP2 is formed on the basis of MRP. It is a generalized MRP system, called the manufacturing energy plan. The basic idea is to realize just-in-time production according to the production plan and rationally configure the manufacturing resources. To minimize the waste of funds, equipment resources, human resources, reduce the backlog of raw materials, and reduce inventory. MRP2 has large software in the world and is also included in the "863" program in China. MRP2 is a system that integrates production, finance, sales, product technology, manufacturing process, equipment utilization, labor hours, procurement, inventory and other subsystems with computer-aided production planning, operation planning and inventory control as the center. MRP2 automatically prepares the requirements for the components, components, parts and materials that make up the product according to the composition table and inventory of the product, and formulates the production of each component according to the delivery date of the product and the production advancement standard of each component. Schedules and delivery schedules of raw materials and outsourced purchased parts, and the allocation and balance of monetary resources, equipment resources and human resources. In the case of a shortage of resources or when the order contract changes, the order of production optimization can be adjusted according to the emergency situation, and the production operation plan that meets the new situation can be re-programmed.
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