Process Industry, SCM ERP MES, PCS, PCS transmission, WSDL, UDDI

Process-based manufacturer is the object to be processed without interruption through the production equipment, petrochemical, metallurgy, electric power, light industry, pharmaceuticals, and environmental protection in the national economy dominated by industry, the production of the basic characteristics of a series of processing equipment that enables the raw material in making the required chemical reactions or physical changes, the final satisfactory product. Process industry in the global top 500, about 70 more than industry, accounting for 15% of its operating revenues accounted for 16.5% of total revenue (according to Fortune magazine in 1999 data). An annual output value of China's process industry companies account for 66% of annual GDP (according to China's Statistical Yearbook 1999 data), process industries, development of a direct impact on the country's economic base.   Most process-oriented enterprises is an important energy and raw materials industries, product variety and stability, producing a large quantity of, process most of the fixed, normally-stock production model. Continuous industrial production are generally accompanied by chemical changes, usually at high temperature and pressure under such harsh conditions, and its production of long continuous, stop often bring huge economic losses, enterprise automation objective is how to effectively monitor and control the production process, so that the production process in the best condition, saving raw materials, reducing energy consumption and other consumption, improve product quality product rate, and improve device lifetime. Process-oriented enterprises generally used DCS, PLC and other control system, a high degree of automation.   A Process Industry ERP / MES / PCS in three-tier structure  
ERP / MES / PCS in three-tier structure   The 20th century, late 80's, an increasingly competitive global market, process-oriented enterprises through the implementation of MRP / ERP to improve the management level of $ enhance the competitiveness of enterprises. However, corporate upper management of production planning (ERP) more and more influenced by the market, the planned adaptation problem has cropped up with the underlying process control system (PCS) gap between the contradictions become increasingly prominent. How to effectively utilize the upper and lower ERP data between the PCS and improve planning, scheduling, real-time and flexibility, has become a business concern.  
To MRP Ⅱ / ERP as the representative of the management information systems, as well as PLC, DCS as the representative of the automation technology, in the process-oriented industries has been large-scale application. Despite the promotion of these two types of systems to achieve a certain effect, but it ignores the effective cooperation between the two, resulting in a lack of effective business plan top real-time information support, the lack of optimization of the lower control link scheduling and coordination. Plan the implementation layer and the shop floor can not be a good two-way flow of information interaction, business would be difficult to real-time response. To address this problem, the U.S. advanced manufacturing research institutions (AMR) proposed a "manufacturing execution system MES" concept, MES is located in the upper program management systems and the underlying process control systems-oriented shop floor management information systems. According to the characteristics of process-oriented enterprises, combined with process control technology and management techniques, process enterprise ERP / MES / PCS general structure of three-tier architecture.  
The bottom of the control system focused on the production process equipment, in seconds (s) as the unit monitor the operational status of production equipment. Control over the entire production process. The middle layer manufacturing execution system to focus on the entire production process management, consider the overall balance of the production process, focusing on operational management of the production process, focusing on product and installment, to the minute (min) hours (h) as a unit to track the product manufacturing process. Top-level business plan system to the production and sale for dealing with objects, focusing on the ordering, delivery, cost and customer relations, so as to month, week, day unit.   In the process industry modern integrated manufacturing systems, MES plays generated from the production process control of information generated from the production process management, operation and management of information and activities from the information generated by the conversion, processing, transmission role, is to produce process control and management of information integration important bridge and link.  
ERP / MES / PCS data transmission between the MES The main features include: production scheduling, resource allocation, working hours management, document control, data acquisition, WIP tracking, quality management, equipment management, are a bridge to connect ERP and PCS. On the one hand, MES to ERP systems to provide timely preparation of data and information, on the other hand, through the PCS of the underlying data collection and analysis, to optimize and control the operation of production lines to provide a basis and guarantees to meet the business-to-real-time requirements.  
From the ERP → MES → PCS transmission of information: ERP through the MRP operations, the need for the production demand, BOM, production resources, calendar of events, processing orders, inventory status and other information processing, it will process and production scheduling, spare parts inventory, production analysis reports, material shortage of information, production optimization and other operating parameters passed to the PCS layer, PCS layer according to the data obtained for the corresponding operation.  
From the ERP → MES → PCS transmission of information: PCS receive work orders issued by MES to complete the corresponding work in the work of PCS layer while the underlying real-time feedback of information to the MES, such information includes: process progress information, equipment operating parameters, use of materials state, the workpiece clamping time, the actual working hours to complete the number of products, waste quantity, job status, job status and equipment status, etc., MES layer of information for further processing, it will work order status, resource status, working hours, information, material consumption situation, the actual production process, WIP information, scrap of information, the actual inventory status, staff allocation information fed back to the ERP system.   The flow of information to pass the three-tier system, feedback to ensure the real-time information to enable enterprises to achieve real-time production planning and scheduling, dynamic cost management possible.  
ERP / MES / PCS in Information Integration  
ERP / MES / PCS, the system development platform, the database may be heterogeneous, and in three in order to achieve information sharing and integration, the need to achieve cross-platform. W3C developed XML can be used to achieve cross-platform, XML files are text files, so that heterogeneous systems in a unified data information to define, organize and express it possible to present all the major relational database to read and generate XML data with the ability XML in various sectors has been generally supported.  
In the ERP / MES / PCS in the three-tier architecture, ERP and MES interactive information and sharing are achieved through XML. Low-level control system and MES communication using OPC (OLE for Process Control) standard. OPC using Client / Server mode of communication, OPC defines a set of used to support the process of data access, alarms, events, processes, historical data access and other functions of the COM interfaces, OPC servers on the one hand is responsible for communication with field devices, on the other will be obtained data through a standard OPC interface (OPC Server the external interface consistency) for the caller called. Manufacturing execution systems and the underlying mode of communication control system as shown in Figure. Two processes enterprise SCM /ERP/ MES / PCS Integration Framework   For the ever-changing market demands and the changing global competitive environment, in the past that the production as the core enterprise management mode is no longer adapt to the current situation, we must consider the overall operation of enterprises, the supply of raw materials, transportation, warehousing, manufacturing , product transportation, sales, customer and customer needs as a whole to treat, through the supply chain management and optimization, to achieve lower costs, improve product quality, increase production flexibility, improved customer service a competitive advantage.  
The entire supply chain, the enterprise's revenue depends not only on internal processes to accelerate operations and automation, but also on the efficiency of such enterprises will pass by its suppliers and customers, consisting of the entire supply chain systems. All nodes in the supply chain management businesses through collaboration and coordination of operations for each of the nodes of the decentralized programs are integrated into the entire supply chain plan, greatly enhance the supply chain in large market environment as a whole benefits, but also so that all enterprises were achieved with minimal cost and conversion cost of the individual to gain cost advantages. Effective supply chain management can make the upstream and downstream enterprises to minimize inventory, so that all the upstream enterprise products that can accurately. In a timely manner to reach the downstream enterprises, which not only accelerated the pace of supply chain logistics, but also reduce the inventory of each business and financial occupation. With this the overall supply chain management, optimization of its role in achieving the entire value chain, value-added.  
Through the computer network technology, the use of e-commerce will, on the composition of upstream and downstream industry as a whole system of corporate supply chain, supply chain nodes to achieve a seamless link between enterprises to form a dynamic, global network of supply chain network, through which the whole Optimization of the role of supply chain management to realize the entire value chain, value-added, genuinely enhance the core competitiveness of enterprises. Through e-commerce system enables businesses with suppliers, distributors, customers closely linked to the daily operation of the dealers, including orders, plans, bills of exchange and other timely and accurate summary to the enterprise database, at the same time through e-commerce system suppliers, agents can understand orders, shipments, through the corporate database can query the corresponding products business production and sales and inventory and so on.  
In the supply chain to achieve independence within the enterprise exchange of information between information systems need to address the following issues: the interaction of heterogeneous database access, different architecture, data exchange between applications, different companies use different communication protocols.   Web services are developed in recent years a new generation of Web technologies, V service is a set of processes and a set of protocols, through the SOAP, WSDL, UDDI 3 such components, Web services, according to service providers, service registry, service users the triangular relationship in operation. Service providers to provide services to third-party registration agencies, service broker made to suppliers of services Directory (Directory), service users need service, first search for registered directory to find a suitable supplier, and then directly with suppliers through the SOAP standard contact information to WSDL of the XML format for transmission.   Web services can be a good solution to inter-enterprise information integration problems, and compare the traditional way Web applications, Web services are loosely coupled, flexible cross-vendor, cross-platform, cross-language. Web-based services, SCM / ERP / MES / PCS information integration framework.   In the supply chain, manufacturers, suppliers, distributors, customers and can be authorized partners provide real-time information, such as inventory, pricing information, order fulfillment and so on. If dealers want to check the implementation of the orders, dealers registered through UDDI server query the WSDL description of all services and will be described in the WSDL generated SOAP request message, binding service provider, SOAP request is sent as an HTTP POST request , referred to the Web server processing. Analysis of Web server HTTP information and to find the name of the SOAP router, and then passes the request message to the specified SOAP router. SOAP Router analysis of HTTP header to identify the location of a Web service adapter, through the Web Service Adapter in turn send the request to the ERP / MES / PCS systems, the underlying control system products to the completion of real-time feedback to the top of the ERP systems, ERP The system will result returned to the Web Service Adapter. Adapter will be resulted in the adoption SOAP message, returned to the SOAP router. The final service requestor (dealer) received data contains the results of the implementation of the SOAP packets, using XML parser for XML data parsing out the required data.   3 Conclusion   Process-based industry is an important pillar of national economic development, industry, process industry how advanced process manufacturing technology, modern management techniques and advanced process control technology combined, how to business management, manufacturing process control, operation and management as a an organic whole to manage and control, in order to achieve optimal control of enterprises to optimize operation and optimization of management is process-oriented enterprises urgently need to address the problem.