Radio frequency identification (RFID) appeared in 1940. Firstly, it is applied to the army and some organizations with special requirements for identification system. Because of its high operating costs and lack of relevant technical standards, it was not immediately applied to the commercial field until 1980. In this paper, the data acquisition system of RFlD is combined with MES (manufacturing rlng execution system) and WMS (warehouse management system) to optimize the logistics process of manufacturing industry. The basic structure of logistics management information system in the whole process from purchase to sales is given, and the basic business operation process of RFID application is designed to realize the automatic collection of data in the process.
2、 Logistics management information system based on RFID
The logistics management information system based on RFID can help manufacturing industry realize real-time tracking of various resources. Timely complete the supply of production materials and the adjustment of production rhythm. So as to improve the tracking, positioning and management level of resources, and improve the automation level and overall efficiency of manufacturing industry. Its hardware consists of electronic tag, RFlD reader, RFID middleware, management system server and management system workstation.
Electronic label: it is divided into active electronic label, passive electronic label and semi-automatic electronic label. The active tag has a power supply and can be dormant outside the range of the reader. Enter the scope of the reader to be activated. It can also send signals without interruption, and the operation range is 20 meters to 100 meters: the passive electronic tag uses modulation scattering mode to transmit data. It has to modulate its own signal using the carrier of the reader, operating in a range of a few inches to 30 feet.
RFID Reader: divided into fixed reader and portable reader. Fixed reader is the most commonly used, due to the requirements of volume, power, power consumption and so on. The fixed installation is mainly used for the access control of warehouse and workshop to confirm the quantity and batch number of incoming goods. In addition, it is applied in the workshop to monitor the material consumption of each workshop in real time. Portable reader is a powerful supplement to fixed reader. It can meet the requirements of field operation, close range, mobile identification and low energy consumption. It is mainly used to determine the location and daily inventory. UWB reader belongs to fixed reader. It is mainly used to locate and track the internal equipment in the warehouse.
At present, the main manufacturers of RFID middleware platform are LBM, Microsoft, Oracle, sap, sun, etc. RFID middleware mainly includes two levels of functions. The first level is to provide services for the latter two levels to improve the performance and efficacy of RFID on the Internet. The second level is responsible for the communication with RFID hardware devices, filtering and sorting the data provided by RFID reader.
3、 Application of manufacturing logistics management information system based on RFID
The advantages of RFID in manufacturing logistics information system are mainly reflected in two aspects. Firstly, RFID can play a huge role in manufacturing logistics, which can automatically identify the location and status of materials, semi-finished products and finished products in each link of manufacturing logistics. And send these information to MES quickly and accurately. secondly. Improve the accuracy of information collection of manufacturing logistics information system. Simplify the process of stock in and stock out. Timely understand the inventory status of goods to ensure that the inventory of goods is more accurate and rapid.
RFID can monitor the identification and tracking of goods in real time. MES can optimize the management of the whole production process from the production order to the product completion through the transmission of information. When there are real-time events in the factory, MES can timely respond to these events, report them, and use the current accurate data to constrain and deal with them. MES takes process mathematical model as the core, connects real-time database or non real-time relational database, monitors, diagnoses and controls the production process in real time, completes unit integration and system optimization, and balances materials at the production process level (not the management level). Arrange production plan, implement scheduling, production scheduling and optimization. MES focuses on dynamic management. Need to collect a large number of real-time data in the production process, according to the site changes to adjust. And RFID just can quickly and accurately complete a large number of real-time data collection. Therefore, we can use the combination of RFID and MES to control each production link in real time. Ensure smooth production. Through the fixed reader installed in each workshop, the consumption of materials in each workshop is read in real time, and the data is transmitted to the database. MES monitors the data in real time according to the data. To give instructions to each workshop location. Scheduling. When the material in each workshop is reduced to the preset critical point, MES will issue the replenishment instruction to WMS. The warehouse can supply the workshop according to the instruction. Thus greatly improve the manufacturing logistics management information system information, automation. And it can monitor the material situation of each workshop in real time. To achieve the rhythm control of the whole production process and improve the overall efficiency.
RFID can improve the warehouse operation ability and simplify the process. Suppose that all suppliers adopt RFID technology. And the containers or pallets of goods have RFID tags. Then we can use RFlD to confirm the in out information in three aspects: the receiving and in out flow chart, the picking and out flow chart. Daily inventory check; Real time monitoring of warehouse equipment.
(1) The RFID access control system is used for the confirmation of the in and out information. The fixed reader and the handheld reader are used together. The handheld reader is used to read the location and pallet information. Fixed reader to realize the confirmation of cargo information and pallet information. The application of the two kinds of readers can not only realize the recognition of multiple targets in motion. Improve the efficiency of warehousing. It can also monitor the status of goods and pallet containers.
(2) Daily inventory check. A handheld reader is used. Through reading the label on standardized and unit packaging. To complete the daily inventory can not only save labor costs, but also improve the accuracy and efficiency of inventory.
(3) The real-time monitoring of warehouse equipment adopts UWB reader. The location and current status of the equipment in the warehouse can be determined by UWB reader. It is convenient for the selection of location and transportation tool route after the goods enter the warehouse. It can also improve the efficiency of warehousing. And reduce the operation cost of the equipment.
4、 Conclusion and development prospect
In this paper, RFID and manufacturing logistics management information system are combined to complete the data collection and sorting of MES and WMS. It improves the material supply and warehouse management process of the traditional manufacturing industry, and realizes the real-time monitoring and tracking of the logistics information, so as to reduce the cost and improve the production efficiency at the same time. Bring significant benefits to the manufacturing industry.
Editor in charge: CT