1. System Overview
1.1. System Background
Global commercial competition of the 21st century is not only the individual contend of technology, cost and management etc, but also is comprehensive competition of the global supply chain in the balance. It is essential for the enterprise to improve their production efficiency and reduce their operating cost.
The problems found quickly in the warehouse management can be improved, designed and establish a complete set of warehouse management flow, so storage turnover rate can be enhanced, the occupancy of working capital can be reduced, the freeze assets can be changed into cash, and the cost caused by warehouse elimination can be decreased.
Business retails titans of the multinationals make considerable investment on the supply chain strategy, program, operation management, distribution centre planning, warehouse planning etc. and utilizing the state of the art technology to build up the rapid and efficient operation system.
Using RFID technology managing the warehousing of goods, identify the pallets, simplify the operational flow and improve the working efficiency, so that it can relieve the labor intensity of workers.
1.2. Situation and Analysis
Existing warehouse management systems always use bar code technology, or manually write warehousing management documents etc. But bar code is easy to copy and non-moisture proof, as well as the complexity of manual writing, which can easily cause human loss and other problems. Human-based warehouse management is inefficient, and it is time-consuming and exhausting to sort goods, search goods and check the inventory, so that there are the defects in the warehouse management.
Using RFID technology manage intelligently warehouse solution, firstly each items should be attached RFID tag, RFID fixed reader installed at the sides of passway will identify tag data to judge the operating flow, such as check-in, check-out, transfer, allocation, inventory etc.. Tag data can be automatically captured via RFID reader , which will guarantee the data inputting rate of every step and accuracy, ensure company timely/accurately know the real data of storage, and realize high-efficient goods seeking and real-time stock-taking, improve the working efficiency of warehouse management and bail out the time-consuming and exhausting, which reasonably keep and control the warehouse, so as to make the enterprise revolved efficiently. Scientific code can manage conveniently the items batch, quality guarantee period etc. Location management function can query all the current location of the inventory.
2. System Introduction
2.1. System Principle
The design of warehouse management system adopts the following three structures:
Information Acquisition Layer
Each items will be passed with rfid tag, goods can be identified by tag unique ID number and user code. Reader can capture automatically tag information, so as to realize the information acquisition function of goods.
Data Transmission Layer
Tag information captured by RFID reader will be uploaded to back-up system for analysis via related communication interfaces, such as RS-232, RS-485, Ethernet, WIFI or GPRS etc. And its communication interface also can be customized as user’s specific requirements.
Goods Management Layer
After PC terminals or background data center receive the data from reader, it will analysis these data, so as to estimate the goods entrance, exit, transfer, inventory etc. In the meanwhile, the detailed list of table will be generated correspondingly and processed in the system.
2.2 System Structure
RFID warehouse management system hardware mainly consists of RFID tag, fixed reader, handheld reader, server, personal computer etc, which can achieve the interconnection and data exchange by the network.
RFID warehouse management system software includes the supply chain management system, RFID tag issuing system and RFID tag identification acquisition system, these systems will be connected with each other and completes every flow of goods management together. Back-up database management system is the center of the whole system, RFID identification acquisition is the foundation and method of realizing management function.
2.2.1 Supply chain management system
The supply chain management system consists of database server and management terminals, which is the data
center of system and responsible to communicate with reader data, converting the data uploaded by reader and inserting into database of the supply chain management system, so that tag management information, issuing tag and capturing tag information can be saved and processed.
2.2.2 Tag issuing system
RFID tag issuing system is composed of RFID desktop reader and tag information management software, which is responsible for information writing of location tag, items tag and package tag, as well as modification, authorization and encryption of tag ID number etc. Tag information management software is embedded into the backup system to achieve the one-to-one correspondence of the supply chain system.
2.2.3 RFID tag acquisition system
RFID tag acquisition system is composed of fixed reader, handheld reader and tag. Tag information of goods can be identified automatically by fixed reader and handheld reader, which will be uploaded to backup system for analysis and sorting, so as to judge the goods check-in, check-out, allocation and maintain flow etc.
2.3 System function module
RFID warehouse management system is composed of registering card, check-out management, check-in management, allocation, stock-taking and addition functions. Check-out management system consist of outbound goods application, outbound goods identification, outbound record downloading. Check-in management system contains location distribution setting, unloading cargo identification and check-in record management.
2.4 Working Process
2.4.1 Registering and attaching tag
Each new item is affixed to the match RFID tag. The unique tag ID or user writing data can be regarded as the goods identification number, and these data can be recorded as item name, purchasing time, warehouse number, goods attribute etc. When RFID reader installed at each passway identifies tag data, all information will be captured automatically
2.4.2 Goods check-in
Firstly goods entered into the warehouse should be arranged the storage location in the system, such as items type, warehouse number, the shelves number; Secondly all goods attached RFID tags will be sent to the stockroom region, then deliver to warehouse from the passway. When passing through the passway, RFID reader will identify automatically tag information, if the tag information and quantity identified by RFID reader are right, these goods will check in; if tag information identified by reader are wrong or the quantity are less, the system will be prompted; When goods check in, the operator will put goods into the corresponding warehouse area according to the tag information and accurate system prompt, meanwhile the system will automatically update goods information( date, material, classification, quantity etc.) and generate the details list of check-in.
2.4.3 Goods check-out
• When applying check-out, the application form of outbound goods should be filled in on the personal computer.
After the stock clerk receive the outbound order, they can search the corresponding items by RFID handheld reader or query server, and put the items in the outbound area. Outbound goods attached RFID tags will be identified by RFID fixed reader installed at the passway, then load on the truck. RFID fixed reader will identify RFID tag information and check with the application form of check-out, then confirm if the goods loaded on the truck are match, if not, RFID reader will identify repeatedly or add the stock out.