Control method of programmable logic controller

Abstract

The invention relates to a control method of a programmable logic controller. The method includes a method for controlling a programmable logic controller (PLC) by configuration programming using electrical and instrumentation national standard graphic symbols. By dragging symbols in a built-in graphic symbol library of a device, a program in a paper pattern electric installation style is rapidlyconfigured, and then the graphic symbols which are completed in configuration are corresponding to switching quantity input and output ports and analog quantity input and output ports of the programmable logic controller, to realize collection and port control actions. The method enables an electrical designer to configure and program a design program in the form of an electric installation drawing, to realize control of programmable logic controller. Configuration programming is simple and intuitive, and can replace ladder diagrams, sentence tables and other tedious programming methods currently used in automation engineering, so as to reduce time cost for projects, reduce difficulty of construction technology for engineering technicians, and provide a visual and simple programming interface for later maintenance personnel to modify and add ports.

Description

technical field [0001] The invention relates to the field of automatic control, in particular to a control method of a programmable logic controller. Background technique [0002] 1. The use of existing programmable logic controllers: [0003] At present, the programmable logic controllers on the market need to use professional programming software to write programs such as ladder diagrams, statement lists, and function blocks on the computer, and then download them to the programmable logic controller after compilation to realize the control of the equipment. [0004] 2. Disadvantages of existing control programmable logic controllers: [0005] 1. The design process is complicated: as mentioned above, the programmable logic controller currently used to realize circuit control needs to go through multiple departments and multiple design processes, and then the program is written by professional programmers, and finally downloaded to the system of the programmable logic cont...

AI Technical Summary

Problems solved by technology

[0005] 1. The design process is complicated: as mentioned above, the programmable logic controller currently used to realize circuit control needs to go through multiple departments and multiple design processes, and then the program is written by professional programmers, and finally downloaded to the system of the programmable logic controller , in order to realize the control of the equipment

[0006] 2. Expensive: In a centralized control automation project, the upper computer configuration equipment, programming equipment and lower computer control equipment have become necessary equipment, and the price of the two systems accounts for a considerable part of the cost of the entire project. proportion

[0007] 3. Difficulty in troubleshooting: For some large systems with many input and output points, if the equipment fails, the programming notes or the I / O table corresponding to the port are lost, it will cause considerable difficulties for maintenance personnel to troubleshoot. Skilled operation of automation program programming and configuration is a long process that requires long-term accumulation of experience. For automation personnel, it is not possible to master and operate existing programmable logic controllers overnight.

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