Manufacturing companies care about three issues: what to produce? How much is it produced? How to produce? The company's production plan answers the first two questions, "how to produce" is "mastered" by the process control system SFC at the production site. ERP, CRM and other systems only provide data information for the preparation of the production plan. How to change the factors in the production process to the “plan†quickly when the “plan†reaches the “production†link, there needs to be a plan between production and production. “Real-time information channelâ€, MES (Manufacturing Execution System) is the “information hub†between planning and production. The traditional production process adopted by China's manufacturing industry for many years is characterized by “top-down†production as planned. Simply speaking, it is from the planning level to the production control layer: the company formulates the production plan according to the order or market situation—the production plan arrives at the production site—organizes production—product delivery. The focus of enterprise management informationization is mostly placed at the planning level for production planning management and general affairs processing. For example, ERP is “positioned†at the upper level of the enterprise, integrating the existing production resources of the enterprise and preparing production plans. Modern consumers are no longer satisfied with mass production, and cars, home appliances, mobile phones, and computers all evoke a "personalization" trend. In order to meet these market demands, the manufacturing model of the manufacturing industry has also gradually shifted to the BTS. The BTO brings a personalized, faster response to the needs of the product or service. For a product or service provider, to achieve these two points, not only faster design tools, high-volume production to small-volume production conversion, e-commerce, but more importantly, guarantee from order-arrangement Production planning—production—control—delivery, etc., provides a smooth flow of information, communication, and feedback to all aspects of the link between the manufacturer and the customer. As far as the current situation of China's manufacturing industry is concerned, the problem of information communication between production planning and production is widespread. The simple proportional relationship between cost and quality has long been negated by modern management theory, but achieving a win-win situation in terms of cost and quality is not easy. According to the idea of ​​TQM (Total Quality Management), it is necessary to improve the quality of products without increasing production costs, that is, the entire process of production and the factors affecting production must be strictly controlled. For example, the product defect rate is an important factor reflecting the quality of the product. It may be caused by a point on the production line or by several errors. If the points on the production line cannot be effectively monitored. And information management, product quality will be affected, and, due to the high degree of automation of the production line, a single point of error may affect a batch of products, not one. ERP can quickly and efficiently arrange production plans according to orders, but can not acquire, analyze, and process various types of products and production-related information on the production site in real time. For example, a component may be out of stock, so that the plant has been shut down due to lack of material, but the management is unable to know the information from the ERP system in time, leading to delays in decision-making, thus affecting production schedule and even delivery time. On October 23, 2002, the General Administration of Quality Supervision, Inspection and Quarantine officially announced to the public the "Regulations on the Management of Defective Automobile Product Recalls (Draft)", which marked the countdown to the implementation of the automobile recall system in China; in January 2003, Shanghai officially implemented the "Shanghai Consumers". The Regulations on the Protection of Rights and Interests established the commodity recall system for the first time. How to eliminate the fault between the planning layer and the field control layer? MES has entered people's sight. MES (Manufacturing ExecuTIon System), the manufacturing execution system, is a new concept proposed by the American management community in the 1990s. It is the execution layer between the planning layer and the field operation control layer, and is mainly responsible for production management and scheduling execution. MES enhances manufacturing competitiveness by controlling all plant resources including materials, equipment, personnel, process instructions and facilities, providing a way to systematically integrate functions such as quality control, document management, production scheduling, etc. on a unified platform. . Cable Installation Machines And Tools
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MES eliminates the “fault†of information between enterprise planning and production control, enabling enterprises to truly “react in real timeâ€.
With the continuous deepening of enterprise information construction, ERP, SCM, CRM, EIP, PDM and other information management software have been accepted by many managers, and they have been widely used in enterprise management. Certain management benefits. Therefore, some people believe that the production and operation activities of ERP companies can be “macro in the palm and microscopic in the gripâ€. In fact, there is another important link that has been neglected: the above management system mainly processes and calculates the management data of the enterprise, mainly applied in planning, forecasting, analysis, etc., and the main body of the production process of the enterprise - production site management Not involved. Experts pointed out that "especially in manufacturing enterprises, the information flow 'disruption' in the process of management informationization is more obvious. The management of the production site of the enterprise is like operating in the black box, which makes many management benefits invisible." 
In the lower production control layer, the company mainly uses automated production equipment, automated testing equipment, automated logistics handling equipment to solve the production bottleneck of specific production (process), and achieve automatic control of the production site.
The benign operation of a company is to make the "plan" and "production" closely "cooperate". Mastering the changes in the production site in the shortest time is the key to ensuring a reasonable and quick correction of the plan. To this end, a “through train†is required between the planning layer and the production control layer of the enterprise, so that the planning and production site can interact in real time.
However, at present, the information transfer between the production plan and the production site derived from the ERP in the enterprise relies on “manual operationâ€, that is, the information of the production site is manually input into the upper system. Therefore, there is a fault in the flow of information between the planning layer and the process control layer at the production site.
The changes in the market environment and the continuous updating of modern production management concepts have become more and more urgent to require “elimination of faultsâ€, that is, an information management system that can grasp the status of production sites from the bottom up. It is embodied in the following aspects:
A direct problem brought about by the recall system is that when a recall occurs, the manufacturer needs to transfer all kinds of information in the process of product production from the system, such as: operation information of each process, operator, supplier information of parts, etc. . This is not available for systems such as ERP at the planning level or for on-site process control systems.
MES emphasizes control and coordination, so that modern manufacturing information systems not only have a good planning system, but also an implementation system that enables the implementation of the plan. However, in the 1990s, the company's general inventory-oriented production model did not receive attention.
In recent years, with the introduction of new production models such as JIT (Just In TIme) and BTO (Order-Oriented Production), and the higher requirements of customers and the market for product quality, MES has been rediscovered and valued. At the same time, after the fragmentation of the network economy bubble, enterprises began to realize that they should upgrade their competitiveness from the most basic production management, that is, only the data information is taken out from the product level (basic automation level), passed through the operation control level, and delivered to the management level. In order to achieve enterprise information integration through continuous information flow, enterprises can be in an invincible position in the increasingly fierce competition. Currently, MES is rapidly and widely used abroad.
The enterprise information system is a collection of information intertwined. As the most important and most basic activity in the manufacturing industry, production, its related information needs to be processed and analyzed in real time. Specifically, it collects a large amount of real-time data in the production process, and processes real-time events in a timely manner. At the same time, it maintains two-way communication capability with the planning layer and the production control layer, receives corresponding data from the upper and lower layers, and feeds back the processing results and production instructions.
From the perspective of enterprise information architecture, MES acts between the upper information management system (such as ERP, CRM) and the field control system (Shop Floor Control).
In terms of function, MES should achieve the purpose of production management and coordination, including the following major modules: order management, task dispatching, material management, work-in-process monitoring, production scheduling, quality management, equipment management, capacity balance analysis, and system. Integration (integrated interface such as ERP, SFC, etc.). 