20 key knowledge answers about access control systems

0 Preface

A spare part is a part used to replace a faulty part when repairing a faulty device. Spare parts are an important material basis for equipment maintenance. Timely spare parts supply can shorten equipment maintenance time and reduce downtime loss. Supplying high quality spare parts can ensure maintenance quality and maintenance cycle and improve equipment reliability. In order to timely repair and maintain the equipment, it is necessary to ensure that there are enough spare parts as the basis, and the spare parts management will directly affect the equipment integrity and life cycle costs. Excessive spare parts storage will cause a backlog, affecting the company's liquidity turnover, increasing product costs, and increasing the warehouse area and storage costs; if the spare parts reserve is too small and the supply is not timely, it will bring risks and increase downtime, so that the enterprise Production activities and economic benefits suffered losses. Therefore, the rational management of spare parts is of great significance to improve the efficiency of equipment and reduce the cost of enterprises.

Modern enterprise spare parts involve a large number of products. In order to gain an advantage in the fierce competition, it is necessary to put forward higher requirements for spare parts management: improve the accuracy of spare parts inquiry, improve the quality of inventory operations, improve inventory safety, and improve spare parts access. Library efficiency, these should be done in spare parts management. However, there are two main types of spare parts management available in most units. The first is the combination of artificial memory and cards. Mainly used in enterprises with few spare parts, this method is not only time-consuming and laborious, but also easy to make mistakes, which makes the spare parts management inefficient and brings great losses to the enterprise. Secondly, by implementing modern warehouse management system, using bar code technology as warehouse The method of synchronizing the flow of goods and the flow of information in management, and the bar code has the advantages of low cost, efficient sorting of spare parts and information of many items. However, with the continuous improvement of information requirements of enterprises, the shortcomings of bar code technology are gradually manifested: information can not be changed, storage capacity is small, reading information is inconvenient, etc., which brings inconvenience to fast and effective data collection, but also to the later Data analysis adds to the difficulty.

1 Introduction to RFID technology

Radio Frequency Identification (RFID) is a non-contact automatic identification technology that uses a radio frequency signal to achieve contactless information transmission through spatial coupling (alternating magnetic field or electromagnetic field), and achieves the identification target through the transmitted information. technology. RFID technology first appeared in the British Air Force's Identity System (Identificat-ion Frlend and Foe, IFF) during World War II. Since its inception, RFID technology has been widely used in industrial and commercial automation, transportation control, logistics warehouse management and other fields with its unique advantages. The introduction of RFID technology into the spare parts management system can meet the requirements of enterprise information, automation and modernization of spare parts management, realize the visualization of spare parts status, make spare parts management more effective for the normal work of equipment, and also improve the utilization of warehouse resources.

1.1 Introduction to RFID composition and principle

The RFID system generally consists of four parts: an electronic tag (Tag) consisting of a coupling element and a chip attached to the object for identifying the target, each tag having a unique electronic code (EPC); a reader (Reader): reading Devices that take (and sometimes write) tag information into handheld and fixed types; Antenna: transmit RF signals between tags and readers; data analysis and processing systems for data analysis and processing. In a specific application, the composition of the system will vary depending on the application purpose and environment. The working principle of RFID: When the tag enters the magnetic field, if it receives the special RF signal from the reader, it can send out the product information stored in the chip by the energy obtained by the induced current, ie passive tag or passive tag (Passive) Tag), or actively send a signal active tag or active tag (Active Tag) of a certain frequency, the reader reads the information and decodes it, and sends it to the background information processing system for data processing, which completes the work of the RFID system. process.

1.2 RFID technology features

RFID technology has many advantages not found in bar code technology.

(1) The reading speed is fast and the distance is long. The RFID reader can simultaneously read multiple RFID tags and also enable remote reading. Barcode technology can only scan one barcode at a time in a specific environment;

(2) Being able to accurately mark a single item. An electronic tag can uniquely distinguish a single item from other items. Each bar code technology can only indicate that one type of item cannot track a single item.

(3) Small size and many shapes. RFID is not limited in size and shape in reading, but can be miniaturized and diversified as needed;

(4) Excellent physical properties. It can store permanent data, the data can be dynamically updated, repeated use, long service life, high and low temperature resistance, and can adapt to various working environments, especially harsh environments such as oil, dust and radiation;

(5) It has penetrating and barrier-free reading ability. In the case of being covered, it can penetrate penetrating communication through non-metallic non-transparent materials such as paper, wood and plastic. Barcode technology must be able to read barcodes at close range without blocking.

(6) The memory capacity is large. With the development of memory carriers, the capacity of RFID has been expanding. The maximum capacity of the barcode can only store 3,000 characters;

(7) High security. Since RFID carries electronic information, its data content is protected by a password, making it difficult to be forged.

It is precisely because of these advantages of RFID technology that it has extensive research and application prospects in spare parts management.

2 RFID design and application in spare parts management

Because the electronic tag has the characteristics of read/write direction independence, non-destructiveness, long-distance reading, and simultaneous reading of multiple items, it can greatly improve the record collection speed of spare parts information and reduce the human error rate, so it is widely used. Inventory management.

The spare parts management system uses the platform design idea. The underlying fixed and handheld readers collect spare parts information and display the basic information of the spare parts on the terminal in real time. The middle layer collects single or multiple devices through the wireless network and the wired network. The data is transferred to the database for data update and the change of spare parts is displayed on the user terminal; the top information comprehensive management system performs data analysis and processing, and the user can comprehensively utilize the collected information. The system has the characteristics of modularization, integration and standardization, which is easy to maintain, monitor and easy to manage. The spare parts management system using RFID technology can more accurately quantify the overall situation of spare parts in the spare parts management to achieve visual effects. Spare parts can be tracked through the information management platform, whether in the storage of spare parts or in the outbound. Figure 1 is a block diagram of the RFID-based spare parts management system based on the actual requirements of a unit's spare parts management.

2.1 System Implementation

The system is based on the B/S architecture and is open. The client terminal environment is simple, and the upgrade and deployment are simple. It is easy to integrate with other systems and has strict and fine data permission control. Adopting the industry-leading J2EE architecture, it is open and flexible. Client applications can be deployed on different operating systems and hardware platforms according to different requirements, so that software and hardware platforms can be smoothly upgraded when requirements are deepened. The system shields the differences between databases based on middleware technology, and supports mainstream databases such as Oracle to meet the needs of different users. The system is implemented with Oracle 10g database management software and Java technology, which is easy to deploy and implement, and is convenient for future function expansion. According to the design principle, the overall design method is based on the in-depth analysis of the enterprise requirements, and the division of the business structure of the system is obtained. On the basis of the business architecture, the application domain and the application group are reasonably divided, and the application of each terminal is formed according to the specific needs of different users. Mode, then data architecture and technical architecture design, software function module development. Finally, the software function modules are extracted and combined to form a spare parts management system.

2.2 Data Management

Mainly complete database maintenance, including spare parts catalog, management personnel, warehouse settings, spare parts storage standards, handset information, suppliers, users and other basic settings, mainly to add, delete, update and other operations.

2.3 Data query

The query statistics mainly carry out accurate or fuzzy inquiry on common data such as spare parts inventory, ledger, inventory detailed account, spare parts consumption, spare parts supplier, material increase voucher, material consumption voucher, spare parts and storage and storage.

2.4 Daily management

The main application of RFID technology, in accordance with the spare parts supporting system, to achieve the inventory management of spare parts into the warehouse, out of the library, disk storage, cargo space. The main tasks are divided into functional modules, including: spare parts storage management, spare parts delivery management, and spare parts library management.

(1) Storage management. Management of spare parts from unsealing, registration, and generation of tags to the process of loading shelves. The spare parts library storage operation management process is shown in Figure 2.

(2) Outbound management. Realize the management of spare parts from the outbound order confirmation, location query, distribution and delivery process. The operation management process is shown in Figure 3.

(3) Library management. The library library can be completed, the library library details are generated, and the library database result analysis is performed according to the disk library list information. The disk library is mainly realized by the way that the handheld machine traverses the inventory warehouse, and the operation management process is as shown in FIG. 4 .

2.5 Data Analysis

Mainly complete the analysis of the main parameters such as spare parts consumption statistics, spare parts inventory statistics, spare parts backlog statistics, spare parts funding statistics, etc., and output them in the form of spreadsheets, and form statistical forms according to user requirements.

2.6 Assistant decision making

It mainly assists in the modeling and analysis of the statistical results of spare parts over the years, the comparison of the advantages and disadvantages of related spare parts, and the analysis of the spare parts inventory limit, including technical check, fault diagnosis, performance evaluation, test data analysis, fault law analysis, spare parts consumption analysis, etc. Provide a theoretical basis for spare parts ordering. At the same time, it also has an alarm prompt function, which can remind the spare parts maintenance, minimum inventory, life and so on.

2.7 System Management

Mainly complete user permission settings, data backup, data recovery and system help.

3 Conclusion

This paper elaborates on the design of spare parts management system based on RFID technology, discusses the convenience of RFID technology in the spare parts management system, and describes the whole workflow of the system and the design of spare parts management data analysis. With the continuous development of RFID technology and the gradual reduction of the price of electronic labels, its technical advantages and use value will inevitably change the face of spare parts management, bringing new opportunities and challenges to spare parts management.