PLC-based touch-screen with the frequency of the elevator control
Abstract
With the rapid development of China’s economic and micro-electronics technology , computer technology and automatic control technology has been the rapid development of AC frequency converter technology has entered a new era, and their use has become an increasingly widespread. The modern high-rise building elevator as the vertical transport, and is closely related to people’s lives, with people raising their demands, the lift has been the rapid development of technology has been developed from drag to a speed regulator FM, the logic control replace the original by the PLC to control the relay.
Commonly used in the analysis of modern elevator control system,control program on the basis of the control system combined with the subject requirements of the characteristics of relatively inexpensive, In this paper, a new type of control program used a new type of control program:By the PLC controller,general-purpose inverter and the composition of rotary encoder to achieve the closed-loop speed control Lift speed regulation, parallel access volume of the corresponding PLC switches the I / 0 point to complete the lift of the logic control signal.In this paper, control system software design is divided into two aspects, on the one hand, the design of PLC software, PLC control system to achieve the switch logic processing, thus ensuring that the right elevator failure to respond to calls and handling;On the other hand is the touch screen control interface design. In this paper, Mitsubishi F940GOT-TWD own design software, to carry out the elevator control interface design, at the same time a touch screen and PLC communication design.Combined with the use of touch screen technology, making the elevator control interface even more user-friendly, pluralistic. The use of PLC and touch screen technology to control the elevator, through the rational selection and design, to improve the level of the elevator control and improve the operation of the elevator comfort, so that the lift to reach a more satisfactory control effect.
Keywords: Elevator;PLC;Touch Screen;General-purpose inverters;Optical encoder