The hottest elevator control system based on Sieme

Elevator control system based on Siemens PLC

Abstract: This paper first introduces several popular industrial buses, and focuses on the characteristics and implementation of Siemens as interface bus technology. Then it briefly introduces the development status of the elevator control system and the importance of the application of Siemens bus technology in the elevator control system. Then it explains in detail the application of Siemens as interface bus technology in the elevator and the realization of remote monitoring from two aspects of hardware and software. Finally, it makes a comprehensive index analysis of the development of Siemens PLC in the elevator control system

Keywords: as interface serial communication fieldbus master slave station

elevator control system based on Siemens plc

abstract:first, the paper describes several popular kings of industrial buses and deals strongly with the bus technology about Siemens as interface Secondly, it treats the development condition about elevator-control in brief and involves the importance applying Bus technology to elevator system. Thirdly, from two sides between hardware and software, it discusses the application about Siemens AS-Interface to elevator and implementation about remote-control. Finally, it analyses Elevator Control System based on SIEMENS PLC with compositive consideration.

key words:as-interface serial communica you can rest assured to know about our fieldbus primary station secondary station

1. Bus introduction

1.0 now the more general bus

in the conventional automatic control system, sensors and actuators are wired separately, and the system composed of multiple sensors and actuators needs large bundles of wires. Applying the communication bus to the measurement and control system can not only save a lot of wires, And it can improve the reliability of the system. There are generally two types of industrial buses that have been widely used. One is master-slave structure mode, such as RS485 communication. This communication bus has been widely used in industrial control, and its communication mode is command and response mode. The host sends a query signal to each sub controller regularly, and then each sub controller reports its status. This communication method is less difficult to develop, but the communication actually consumes a considerable part of the resources of the main controller. Therefore, this method does not fully play the powerful computing function of the main controller. The other is the independent communication mode of each node, such as can bus of Omron and Mitsubishi, LonWorks bus of new lift, etc. The reliability and communication rate of this kind of bus are essentially improved compared with the previous one, but the cost is relatively expensive

1.1 as interface bus

in view of the advantages and disadvantages of the two popular serial bus control modes, Siemens absorbed the advantages of the two control modes and launched as interface (remote i/o) bus technology. The as believes that there is a problem with the system setting - the interface is an actuator sensor interface bus system, which collects the scattered i/o signals through the slave station and transmits them to the AS-I master station with only two signal lines. The AS-I master station calls in sequence, and the maximum cycle time is 5ms. In case of error, the AS-I slave station node has the function of automatically closing the bus, cutting off its connection with the bus, so that other slave stations are not affected, and its fault problems can be reflected on the AS-I master station in time. Each frame of AS-I information has CRC verification and other error detection measures, which ensures the high reliability of AS-I bus. The direct communication distance of AS-I bus can be up to 100 meters, and the maximum distance extended through relay station is 300 meters. AS-I bus can be installed with 248 sensors and actuators at most

the connection between Siemens PLC host and slave station is through AS-I master station, without additional communication program. For engineers, remote i/o corresponds to the corresponding bit of image area, which conforms to their programming habits and is very convenient. Due to the application of two-wire communication, the system connection line adopts the card wire puncture structure, which greatly reduces the amount of wiring. Moreover, the unique AS-I ladder cable eliminates the possibility of wiring errors. Compared with the previous PLC control system, it can save a lot of cables and greatly reduce the installation workload

2. Elevator control system

elevator control system has experienced a considerable technological leap from relay control to PLC plus governor control. The existing products have also been formed and their performance is quite stable. The existing elevator control system is basically the structure shown in Figure 1. That is, the control center is in the roof machine room, and all signals in the hoistway and lift car are transmitted to the control center through a large number of cables in the form of point-to-point

the traditional elevator control system has the disadvantages of difficult maintenance and low efficiency due to excessive wiring, complex installation, and difficult to change and expand. Today's elevator users' requirements for elevators have not only stayed in the pursuit of basic functions such as the safety and reliability of the system, but also for the elevator's comfort, efficiency, self fault diagnosis, remote monitoring and other intellectualization and electricity. Welcome to contact us. Our company focuses on the research, production and debugging of various products' hydraulic, pneumatic and hydraulic performance test equipment. For many years, elevator debugging and maintenance simplicity have put forward higher requirements. Therefore, there is an urgent need for an efficient and reliable fieldbus technology to meet the requirements of users, and as interface bus technology is its best choice. The physical realization of AS-I bus is two-wire communication, and the wiring adopts card wire puncture structure. AS-I slave station can be easily connected to the bus, and the unique AS-I ladder cable eliminates the possibility of wiring errors

the as interface bus system of Siemens SCN PLC 2) specifies a kind of mechanical movement to realize elevator control according to the equivalent principle of damage or failure of experimental products

3. Application of as interface bus technology in elevator control system

3.0 hardware implementation

Siemens SCN PLC with as interface bus function has good performance and powerful function, and supports trigonometric function, square root, logarithmic operation and other functions; And monitoring; Support remote monitoring through modem; Fault diagnosis, single scan and forced output can be performed; Variable status table can be used, and signal status and status table can be displayed at the same time by using multiple windows that can be opened at the same time. Therefore, the elevator control system based on SCN PLC is a