Radio Frequency Identification (RFID) was introduced in 1940. It was first applied to the military and some organizations that have special requirements for identification systems. Due to its high operating costs and lack of relevant technical standards, it was not immediately applied to the commercial sector until 1980 when the technology was introduced into the commercial sector. In this paper, RFlD data acquisition system is combined with MES (Manufactu rlng Executlon System) and WMS (Warehouse Management System) to apply to all aspects of manufacturing logistics, thus optimizing its logistics process. The basic structure of the logistics management information system from procurement to sales is given. The basic business operation process of applying RFID is designed to realize the automatic collection of data in the process.
Second, RFID-based logistics management information system
The RFID-based logistics management information system can help the manufacturing industry to realize real-time tracking of various resources, and timely complete the replenishment of production materials and the adjustment of production tact. Thereby improving the level of resource tracking, positioning and management, and improving the automation level and overall efficiency of the manufacturing industry. Its hardware consists of electronic tags, RFlD readers, RFID middleware, management system servers, and management system workstations.
Electronic tags: divided into active electronic tags, passive electronic tags and semi-automatic electronic tags. The active electronic tag has a power supply that can be put to sleep outside the range of the reader. It is activated within the scope of the reader. It can also send signals without interruption. The working range is 20 meters to 100 meters: the passive electronic tag uses modulation scattering. The way the data is transmitted. It must use the carrier of the reader to modulate its own signal, with a range of operations from a few inches to 30 feet.
RFID readers: divided into fixed readers and portable readers. Fixed readers are the most commonly used, due to the requirements of volume, power supply, power consumption, etc. Fixed installation, mainly used for warehouse and workshop access control to confirm the quantity and batch number of goods in the warehouse. Also applied in the workshop , real-time monitoring of the material usage of each workshop. The portable reader is a powerful complement to the fixed reader. It can meet the requirements of field work, close range, mobile identification, low energy consumption, etc. It is mainly used for the determination of the location and the daily inventory of the UWB reader. Reader. Mainly used for locating and tracking internal equipment.
RFID middleware manufacturers currently provide RFID middleware platforms mainly include lBM, Mic rosoft, Oracle, SAP, Sun and so on. RFID middleware mainly includes two levels of functions. The first level is to provide services for improving the performance and efficiency of RFID on the Internet for the latter two levels, and the second level is responsible for communication with RFID hardware devices, reading and writing RFID. The data provided by the device is filtered and sorted.
Third, based on the application of RFID manufacturing logistics management information system
The advantages of RFID in the manufacturing logistics information system are mainly reflected in two aspects. First, 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 all aspects of production logistics. And transfer this information to the MES quickly and accurately. Secondly, improve the accuracy of the information collected by the manufacturing logistics information system. Simplify the process of entering and leaving the warehouse. Keep abreast of the status of the inventory goods and ensure that the inventory of the goods is more accurate and rapid.
1 RFID monitors cargo identification and tracking in real time. The production execution system MES can optimize the management of the entire production process from the issuance of the production order to the completion of the product through the transmission of information. When real-time events occur in the plant, the MES can react to these events in a timely manner, report them, and constrain and process them with current accurate data. MES takes process mathematical model as the core, connects real-time database or non-real-time relational database, performs real-time monitoring, diagnosis and control on production process, completes unit integration and system optimization, and performs material balance in production process layer (not management layer). Arrange production plans, implement scheduling, scheduling and optimization. MES focuses on dynamic management. It is necessary to collect a large amount of real-time data in the production process and adjust it according to the changes in the field. And RFID can quickly and accurately complete the collection of a large amount of real-time data. Therefore, we can control the production process in real time through the combination of RFID and MES to ensure the smooth production. Through the fixed readers installed in each workshop, the consumption of materials in each workshop is read in real time, and the data is transmitted to the database. The MES issues instructions to each workshop work place according to real-time monitoring of the data. When the materials in each production workshop are reduced to the preset critical point, the MES will issue a feeding instruction to the WMS. The warehouse can replenish the production workshop according to the instructions. Thereby greatly improving the informationization and automation of the manufacturing logistics management information system. And it can monitor the materials in each workshop in real time to realize the regulation of the whole production process and improve the overall efficiency.
2 RFID improves warehouse operations and streamlines processes. It is assumed that the suppliers all adopt RFID technology. And the containers or trays of the goods have RFID tags. Then we can use the RFlD application to confirm the inbound and outbound information in the three aspects of receiving, warehousing flow chart and picking and outbound process. Inventory of daily inventory; real-time monitoring of warehouse equipment.
(1) The RFID access control system is used for the confirmation of the inbound and outbound information, and the fixed reader and the handheld reader are used in combination. The handheld reader is used to read the information of the cargo space and the tray. The fixed reader is used to realize the pair. Confirmation of cargo information and pallet information. The application of the two readers not only realizes the recognition of multiple targets in motion, but also improves the efficiency of the inbound and outbound storage. It can also monitor the status of the goods and pallet containers.
(2) Inventory of daily inventory. Handheld readers are used. By performing daily inventory on standardized and unitized packaging, it can not only save labor costs, but also improve accuracy and inventory efficiency.
(3) Real-time monitoring of warehouse equipment, using UWB readers. UWB readers can determine the location and current state of the equipment in the warehouse. It is convenient to select the cargo and handling tools after the goods are put into storage. It also improves warehousing efficiency and reduces equipment operating costs.