Data management in MES of production process execu

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Abstract: Taking the process mathematical model as the core, the production process is monitored, diagnosed and controlled in real time to complete the integration of various production links and the optimization of the system. At the same time, the materials, energy, equipment, quality and data involved in the production process shall be uniformly monitored and managed. This paper comprehensively introduces the classification, provision and backup of data in the implementation of MES system. In the process of implementing ERP, it is concluded that only the effective management of the whole process of MES system data is the fundamental guarantee for the successful implementation of MES system

key words: MES system data management


MES (Manufacturing Execution System) takes the process mathematical model as the core, carries out real-time monitoring, diagnosis and control of the production process, and completes the integration of the whole production link and the optimization of the system. At the production execution level, carry out material balance, arrange production plan, implement scheduling, production scheduling and optimization. At the same time, the materials, energy, equipment, quality and data involved in the production process are monitored uniformly. In the production process, data is the key to the effective operation of the whole system

1 Classification of MES data

according to the role of MES, the data sources of MES can be divided into management information, resource information and performance information

1.1 management information

management information mainly includes scheduling information, quality management information and personnel management information

>. After the distribution is delivered to the production branch, the production branch will decompose it into daily production plan, and then the executive dispatcher will directly decompose it into the pouring plan that should be executed on duty

1.1.2 quality management information

mainly refers to measuring and analyzing the real-time data collected from the manufacturing process, and comparing it with the process specifications and quality standards in the resource information, so as to ensure that the product quality is strictly controlled and reflect those problems that need special attention because they exceed the standard to the management personnel in real time. It includes some related problems, operations and results to help managers determine the source of the problem. At the same time, it can also put forward some expert suggestions or possible schemes to correct the existing problems. After the in-depth exploration of these information, it can also include the standard process control, standard quality control, tracking and management of product testing operation

1.1.3 personnel management information

mainly refers to the status of human resources: shift, personnel structure, education and training level of employees, and tracking records of previous post operations. These are directly related to whether managers can reasonably allocate and manage human resources, optimize the allocation, and maximize the ability, technical level and potential of employees

1.2 resource information

this is a general concept. In short, it includes all digital codes, process specifications, quality standards and inspection standards of available physical objects such as personnel, machines, materials, methods and environment, and all digital information to ensure the correct development of operation activities. For example, the basic information of existing personnel, the status of materials, equipment, spare parts and accessories, the digital information of the products produced, the production technology and operation specifications of the products involved, and the environmental conditions required when producing products with environmental requirements. It is the basis of other processing. Through its induction, analysis and judgment, the MES system can obtain the evaluation results

1.3 performance information

mainly includes: process management information, maintenance management information, product tracking information and execution analysis information

1.3.1 process management information

process management information refers to the completed and ongoing production in all production processes. This includes not only the actual production performance, but also the gap between these operational performance and the scheduled plan. The special significance is that the management personnel can control the production to be carried out according to the information provided therein, and properly deal with the deviation of operation performance from the predetermined plan; In combination with the changes of previous management information and resource information, the production line shall be adjusted in time to adapt to the changes of demand or conditions and achieve the best production performance and product realization

1.3.2 maintenance management information

maintenance management information refers to the maintenance operation and standby of equipment and tools to ensure the implementation of regular maintenance or the response whenever problems occur, as well as the treatment and recovery of faults. At the same time, it also provides dispatchers with accurate real-time status of equipment and tools, so that managers can respond quickly after equipment or tools are abnormal, so as to avoid visible and invisible risks. It can also help prevent and diagnose emerging problems through accurate historical records

1.3.3 product tracking information

product tracking information refers to all status information of products in the manufacturing process and already produced. Including the material composition of the produced products (including raw material origin, chemical composition, physical characteristics, quality, etc.), batch, serial number, operation standard, process and route, specified process parameters and actual values, equipment and tools, operators, quality inspection, product destination, etc., which is conducive to obtaining accurate, true and comprehensive information in case of problems or in the analysis of production process; The product information in the manufacturing process includes previous processes and records, current production conditions, conditions and records, subsequent process trend, any previous alarm information, rework (repair) or other exceptions related to the product. Through data mining, it can be used to deal with product quality objections, timely analyze and improve production processes and parameters, and adjust production strategies or plans

1.3.4 execution analysis information

execution analysis information mainly refers to the comparison between the latest operation performance and previous operation results and written documents such as standards, specifications and contracts obtained by the system through comparison. It collects and summarizes various operation parameters from different data report functions, optimizes and compares them in the system, and finally obtains the output results that can comprehensively evaluate the past and current operation activities. Its output specifically includes: defect judgment in the operation process, analysis of reasonable allocation of equipment and tools, analysis of personnel operation status, discovery of process method errors, determination of control mode defects and other results conducive to improvement

2 the main flow direction of data in the whole MES

as shown in Figure 1, the data flow direction of MES should be the use of MES data, because with the MES system, all data can be shared, but in order to reduce unnecessary data access, reduce the working pressure of the system server and maintain the high efficiency of the system operation. We will artificially specify the direction of data transmission to control its use. The one-way transmission of data is explained in combination with the completion process of an order. If the "Deming ring" mode of quality management is used, it is easy to analyze Figure 1

2.1 plan

the production planning department shall, according to the customer contract and in combination with the production technical documents, including specifications and standards (including additional requirements if necessary) α )、 Inspection standard, equipment and tool status, raw materials and fuel status. Form a digital production plan and deliver it to the production department

2.2 execution D (do)

the production department shall organize personnel to use appropriate equipment and tools according to the plan and technical documents (specifications and standards), and carry out operation activities after reasonably configuring corresponding energy and environmental conditions, so as to ensure the realization of products within the specified time and meet the requirements of customers. Through the data acquisition equipment configured at each station of the production line, collect the real-time data of production (materials, equipment, personnel, product quality status, serial number of manufactured products), and compare whether the product realization process meets the specified technical documents in real time during the data acquisition process

2.3 check C (check)

includes two parts: ① inspection, test and measurement of physical products. Here, the inspectors complete the final judgment of the physical product according to the specified methods and procedures (digital inspection standards) and form standardized documents to prove that the product meets the customer's requirements; ② The inspection of production process includes production analysis, equipment analysis, process analysis and operation analysis of each post. Its function is to let the management, production, quality, technology and other departments use analysis and query tools to understand the production status and trend

2.4 action a (action)

refers to the processing of the above analysis results

3 data provision

the data in MES system can be divided into basic data and dynamic data. Basic data include: digitization of raw materials, fuels, energy, products and technical documents, coding of equipment, clamping tools, human resources coding, confirmation of process flow coding, information unification, etc; Dynamic data refers to the data collected and sorted by the system from L1 and L2 computers. Among them, dynamic data can be easily realized. As long as the real-time data of production is taken out from the database of process computer (mostly SQL and InTouch), or directly obtained from the on-site PLC, it can be said that the accuracy of dynamic data is completely a problem of hardware configuration, It is also relatively easy to solve (of course, it still takes a lot of time at one time in the specific programming process, especially when checking the field name of the original database and the PLC on-site measurement points), while the basic data is different. The content of the basic data is complex and the types are numerous, and the basic data can be divided into accuracy and inaccuracy, standardization and nonstandard, real-time and outdated

when collecting basic data, we must first formulate a coding rule that is scientific, applicable, perfect, scalable, universal and portable. Because in the manufacturing industry of large-scale process materials, there are hundreds of thousands of raw materials, fuels, energy, products and technical documents. If the coding rules are too simple, they are easy to repeat. If they are too complex, they will increase the difficulty of coding, and directly lead to the excessive size of the database, which will seriously affect the speed of the system after the system is online; Reasonable coding rules can make it possible for enterprises to expand the coding range of the system in the future; Reasonable coding rules can provide a portable coding system for enterprises to implement ERP; Reasonable coding rules can reduce the difficulty of coding. At the same time, necessary measures must be taken to ensure the authenticity and reliability of basic data. Qualified units can establish a corresponding organization to ensure the collection quality of basic data through systems

4 data backup and data recovery

4.1 data backup

data plus backup data is very important for any large system such as MES. However, hardware failure and software failure effectively reduce the processing difficulty of CFRP reinforced composites. Part damage, virus attack, hacker harassment, wrong operation and other unexpected reasons threaten the security of data all the time, and the system may crash and fail to work at any time. Perhaps inadvertently, valuable data and long-term accumulated information disappear. Then the only way is to back up


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