The Application of Mitsubishi S7-300 PLC in Elevator Control
Abstract
The implement of PLC (Programmable Logic Controller) in elevator electric control system is presented in this paper. As many of the factories' old grinders' work has been well below the needs of modern production,it's necessary for the old conventional motor control system to have technological transformation, with PLC to replace the conventional relays.Thus it will reduce the intermediate relay, the lines are simplified and improved the reliability,which will achieve the goal of automatic control of grinder. Handle the technique along with the calculator technique, signal, control the technique network is technical to develop continuously is demanding to raise continuously with customer, the PLC measures the processed foundation in the switch up increased to imitate the quantity to handle to control to wait the function with sport.With the rapid development of microelectronics and computer technology, more programmable controller with the functions of a computer,Not only can be realized logic control, but also with the data processing, telecommunications, the Internet and other functions.Because it can be changed by software to control the process, but also has the advantages of small size, ease of maintenance and assembly, programming simple, high reliabilityfeatures, such as anti-jamming capabilities, has been widely used in various fields of industrial control.greatly promote the process of integration of machinery.
The method of logic control part of five-floor elevator is also described by providing system hardware design and program design clues. This paper include of main design method, composition, program design in this elevator control system.
Key words: PLC; elevator; logic control; program design
