Talk about the application in the subway of Access Control System
A summary
With network technical development and extensive application, the development of the Access Control System is changed into the remote based on Internet, network control pattern by the traditional master slaver mode intellectual Access Control System mode too. Entrance guard's supervising system controls the supervisory function to develop to collect computer technology from the simplex entrance guard, the large-scale entrance guard's total management systems of communication technology, automatic recognition technology, mechanical engineering and safety management.
The microelectronics of Tsing-Hua University introduces the high frequency tube discrete device bare chip, has already made sure 9G alpha cut frequency subway Access Control System is a large-scale Access Control System, it have more than control point number, the intersection of data and the intersection of traffic and large, the intersection of data and the intersection of transmission distance and far, the intersection of linkage and apparatus more the intersection of safety performance and the intersection of person who expect much and characteristic.
Make an introduction to composition and function of the Access Control System in the subway below.
The compositions of 2 subways of Access Control Systems
The Access Control System of the subway forms and is formed by four major parts: First, systematic communication network; Second, the supervising system of entrance guard at central level; Third, one grade of entrance guard's supervising systems of station; Fourth, one grade of entrance guard's apparatuses of scene. Have formed the management mode of level control of the two-step management three in operation.
The Access Control System of the subway regards station as the unit, one grade of entrance guard's system work of station of the control room of the station Stand and prohibit the apparatus to manage the inner apparatus door of the station in unison. The station entrance guard's system management work station of every station uploads the data information of every site to the Access Control System at central level through the optical-fibre communications network. The Access Control System at central level is managed the a full range of Access Control System in unison.
2.1 systematic communication networks
The systematic communication network is formed by two parts, first, the key network of all fronts. Namely every site Access Control System work station is carried on the a full range of communication by the network link of optic fibre; Second, one grade of networks of station. Station grades of network adopt the intersection of field bus and way all on-the-spot entrance guard's apparatus connection in the station.
A full range of backbone network on 2.1.1
It is based on technology of industrial Ethernet that what the transmissive backbone network of entrance guard's system data is adopted is. Industrial Ethernet is the product that technology of Ethernet extended in the control network, the agreement group includes the Ethernet physical layers of the physical layer, Ethernet MAC, network interconnection agreement IP of the network layer, transmission control protocol TCP and subscriber data agreement UDP on the transport layer of the link layer,etc., the following picture 1 of contrasting the relation of industrial Ethernet and OSI interconnection reference model is shown. Physical layer and link layer of industrial Ethernet adopt IEEE802.3 standard.
The Access Control System of the subway is through carrying on data communication on the basis of industrial Ethernet, the intersection of system management and work station, entrance guard of station, can pass the intersection of technical grade and gigas of the intersection of optic fibre and switchboard a full range of Fibernet at being direct, the communication speed reaches 10M or 100M, the system any Access Control System work station of station can carry on data interchange with the server inside TCP/IP or IPX agreement and customer directly, share all resources of the whole system in real time. It features: Data transmission, exchanging, sharing and remote access are easy, convenient, data processing is fast, movements are sharp in speed of response.
One grade of entrance guard's system networks of station on 2.1.2
It was field bus way that entrance guard's system network adopted at the station, hang many entrance guard network control units on RS485 field bus respectively, carry on data communication through ATM way, the information of all apparatuses is connected with work station of the station through the converter that RS485 transfers to RS232. Characteristic communication from far, RS485 field bus valid communication 1200 in distance in case of not relaying; Each RS485 mouth of entrance guard's network control unit, can bring up the control device apparatus of many entrance guards. One grade of Access Control Systems includes the Access Control System of grade of every station and controls the Access Control System of grade of central office at the station.
2.2 supervising systems of entrance guard at central level
The Access Control System at central level is the data information of processing centrally the subordinate Access Control System, namely the next grade of one grade of Access Control Systems carries on operation management through the building of system pair control centre of entrance guard at central level, every station.
The master apparatus has central entrance guard's management server, work station of management, server of the data, data library software, entrance guard's system management function software and switchboard.
Management server of the Access Control System on 2.2.1
The main function of management server of the Access Control System is to monitor every station door status, failure message and store the history record.
Work station of system management at central level on 2.2.2
The work station of system management at central level is a management control centre of the Access Control System, realize it to every station (area) All inner entrance guard's terminal control of the system, the satisfaction system operates, functions such as authorizing, apparatus monitoring and controlling, network management, database administration, maintenance management, and the machine format centralized collection of system, counting, keeping, inquiring,etc..
2.2.3 Library software of data
Database data with certain form, sure standard, according to certain data organization requirement, a series of framed data files, according to the definite access path, realize the call to data resources. The commonly used database is SQLServer, Oracle, Sybase.
2.2.4 Technical grade switchboard
The technical grade switchboard of Access Control System at central level supports network management functions. Can manage information flowrate and monitor, analyze; Can distribute bandwidth, priority and control the access to netwoks in order to employ the data flow; Can pass VLAN (the fictitious local area network) Technological ruggedization network management and online security, control needless data broadcasting.
2.2.5 Entrance guard's system management function software
Entrance guard's system management software is because of the operating platform of the Windows, stable operation is in operating systems such as WINDOWS2000, WINDOWSNT, WINDOWSXP,etc..
The main function is as follows:
Control device supervisory function: Control one grade of running status of work station of station, collect one grade of status data of running of work station of station, setting-up, backup, clearance of the database; Entrance guard card authorize supervisory function set up the intersection of station and systematic the intersection of operation and parameter, assign operation command and set up systematic operational mode, get each station; Can remove entrance guard's state of the station under the exigent condition.
The supervisory function of the card: Hairpin, card-withdrawing, reporting the loss of the card.
Record the supervisory function: Carry on real-time recording, history record to operating information, warning message; Unless it carry on trouble inquire whether and analyze, can't can report form edit by oneself,can also day, week such as automatic generation, moon, annual report form; Carry on record and memory of the archive materials.
The network monitors the supervisory function: Have monitoring to system and network online, selfdiagnosis, self-healing and repairing the function online, and displayable network load situation.
