I network is applied in elevator several big advantage analysis - in serial communication- programmable logic

Serial communication as a new type of elevator control system, has been widely used in home, than in the past the centralized and unified control system for each controller can complete some work such as hall, instructions, display, greatly reduce the burden of the master controller, the host controller efficiency improved significantly.serial communication significantly reduced input and output points of PLC process control. Points of PLC in control cabinet will not change with the increase of layer station, standardize control cabinet is possible. Serial communication also reduce the number of shaft cable, make simple and convenient wiring installation, maintenance, fault point decrease greatly, improve the reliability of the control system.at present in the elevator is dominant in the serial communication technology BIBUS network system of master-slave structure, it adopts RS - 485 bus, the communication structure is command response type, its potential risk is to adopt the centralized control mode, once the main contact failure of the whole system will be paralyzed. In the hardware system, the hardware circuit board production, each component could not guarantee the accuracy of the strict, even in the component before using aging treatment not only time-consuming, trouble, or hard to ensure 100% qualified, so the circuit board is difficult to ensure the quality, used in serial is the problems in the system. Another for each contact independent communication methods such as CAN bus, NEW LIFT and LONWORKS fieldbus. In all these serial communication there is a problem is the problem which layer AS soon AS possible after check up is not very convenient, need to check it again, every layer of Siemens AS - and we want to use I can very good solution to this problem. Its main can independently according to information from each station.- - - - - - i, Interface sensor - Actuators - Interface) Is designed for the lowest layer of the automation and network, is used in double location of actuators and sensors in the network. is based on the primary - From the principle of work. On the central controller PLC has a main module. Through the AS - Interface cable connected sensor/actuator as from module by manipulating the main module.- - - - - - I in the elevator concrete application AS shown in figureAS - I in the elevator of the serial communication of several major advantages:1, the save button, indicator light, layer signal cable wiringAS with PLC - Module can be directly installed in the hall I box and the axle box control disc, make the hall button, command buttons, lights, etc. , received the AS - directly I don't have to and PLC controller wires, and all these signals such AS - namely I from standing by a yellow double core cable and control the AS - contained in the cabinet I the main modules are linked together, this greatly reduces the cable wiring in the shaft.

2, saved the PLC I/O pointbecause all hall signals, instruction, lamp, floor, etc. , need not directly connected to a PLC, the PLC points is reduced greatly. 3, programming, debuggingsimple ASI and parallel I/O no difference, so the AS - I connected to the existing system just to slightly modify the control program, the whole system could know ASI internal functions and without additional software debugging.4, communication accurately and timely AS - I was a single master station system, that is, each network is only a platform for data exchange control of the master station, it order to visit each from standing and waiting for their response. 作为- - - - - - I use a fixed transmission mode, thus can satisfy the complex process control transmission or the difference between the requirements of data types.to use the fixed transmission mode, the main access to all connected with it from the station, and update all in 5 milliseconds of I/O information.5, a host can take 31 from the station, a cable to connect up to 248 I/Othe AS - each Interface from the station module can be divided into four binary components provide address, whether as an input or output. Stood fully configured for 31 from module this case, you can for as many as 124 ( 31X4） The binary components provide address, by using two-way from station module, can connect can double the number of binary component, reach up to 248 each main module. 。6, double core cable to transmit data and power supplyat the same time of data exchange, the AS - I cable for power supply (button, indicator light at the same time 30VDC） The power from the AS - I power, without the other power supply. By insulation piercing contact from stand fast connection.to use the fixed transmission mode, the main access to all connected with it from the station, and update all in 5 milliseconds of I/O information.5, a host can take 31 from the station, a cable to connect up to 248 I/Othe AS - each Interface from the station module can be divided into four binary components provide address, whether as an input or output. Stood fully configured for 31 from module this case, you can for as many as 124 ( 31X4） The binary components provide address, by using two-way from station module, can connect can double the number of binary component, reach up to 248 each main module.6, double core cable to transmit data and power supplyat the same time of data exchange, the AS - I cable for power supply (button, indicator light at the same time 30VDC） The power from the AS - I power, without the other power supply. By insulation piercing contact from stand fast connection.
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