Application of Siemens AS-i in Elevator Serial Communication

As a new type of centralized and decentralized elevator control system, serial communication has been widely used in China. Compared with the previous centralized and unified control system, each sub-controller can complete some tasks such as call, instruction, display, etc. The burden of the controller is reduced, and the efficiency of the main controller is significantly improved.

Serial communication significantly reduces the input and output points of the PLC process controller. The number of PLC points in the control cabinet will not change with the increase of floors, making it possible to standardize the control cabinet. In addition, serial communication also reduces the number of hoistway cables, makes installation, wiring and maintenance simple and convenient, greatly reduces fault points, and improves the reliability of the control system.(Siemens 6ES5955-3LF44 SIMATIC S5 , Allen Bradley 2711P-T7C22D9P PanelView , B&R X67SM2436  Motor Module, Allen Bradley 1794-AENTR Adapter)

At present, the profibus network system with master-slave structure is dominant in elevator serial communication technology. It adopts RS-485 bus, and the communication structure is command-response type. The potential danger is the use of centralized control method. Failure the entire system will be paralyzed. In addition, in the hardware system, in the production of hardware circuit boards, it is impossible for each component to be strictly accurate. Even if the aging treatment is performed before the components are used, it is not only time-consuming and troublesome, but also difficult to ensure 100% qualified, so such circuit boards are also very It is difficult to ensure the quality, and it is a hidden trouble when used in a serial system. The other is the independent communication mode of each contact, such as CAN bus, NEW LIFT and LONWORKS bus. In short, there is a problem with these serial communications that it is very inconvenient to check which layer has a problem, and each layer needs to be checked again, and the Siemens AS-I we use can solve this problem very well. Its master station can display the information of each slave station independently.

AS-i (Actuator-Sensor-Interface sensor-actuator-interface) is a network designed for the lowest level of field automation, a network of actuators and sensors used in double stations. AS-I works based on the master-slave principle. There is a master module on the central controller PLC. The sensors/actuators connected via AS-interface cables are operated as slave modules by the master module.

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