Method for executing program of PLC in single step

Abstract

It is a single-step programmable logic controller program method, which is to control the programmable logic controller to run the single order of the program to let the user remove mistakes according to program. It is mainly to adjust the programmable controller into single step operation mode and to receive the operation orders and run the single order and then immediately force the stop and wait next order and then continue. So, the user can remove mistakes from the programmable logic controller.

Description

technical field [0001] The invention relates to a method for single-step program execution, which is applied to a programmable logic controller. Background technique [0002] Programmable logic controller (programmable logic controller, PLC) is a powerful tool for process control. Today, most of the work of factory program automation is performed by programmable logic controllers. It is basically like a system specially designed for process control. The user writes the program into the storage module through the computer software, writer and human-machine interface provided by the manufacturer, and then the central processing unit of the programmable logic controller follows the control logic (controllogic) defined in the program to monitor It also processes input signals from devices such as buttons, sensors or limit switches, and sends output signals to external loads after logical judgment, such as relays, indicator lights, and electric machinery. Sometimes, the output si...

AI Technical Summary

Problems solved by technology

[0004] However, general programmable logic controllers can only be executed in units of "programs", that is, when users are only allowed to execute programs, they can be executed from beginning to end. It consists of three instructions: load, output, and move. When you want to execute this program, you can only choose "not execute" or "execute three instructions continuously from the beginning". Therefore, after the initial stage of the program is completed, the program must be updated. When debugging, there will be certain difficulties, and once the program is quite large and contains a lot of instructions, it is very difficult for users to debug in a continuous execution mode, and it is also quite easy to cause omissions

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