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PLC (programmable logic control) redundancy switching method

A technology of redundant switching and main connection, applied in the direction of program control, instrument, control/regulation system, etc. in the sequence/logic controller, it can solve the problems of real-time monitoring interruption in the production process and the inability to monitor the production status in time, and achieve the realization of The effect of switching in time

Active Publication Date: 2017-12-12
SHANXIN SOFTWARE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve that industrialized production is a continuous process. During the existing PLC redundancy switching, the implementation of the monitoring system will follow the switching of the PLC, and the implementation of the switching is to be connected with the standby CPU. This function must be by means of a dedicated network card and Software, if you use a common network card, it will cause the interruption of real-time monitoring of the production process, making it impossible to monitor the production status in time

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The application provides a method for PLC redundancy switching, characterized in that the method comprises the steps of:

[0024] Set the main connection attribute parameters for the communication protocol set in the WINCC project;

[0025] Set the parameters of the standby connection to correspond to the attribute parameters of the main connection, establish the main link, and set the parameters in the main link to be consistent with the information of the main CPU. is 1;

[0026] Write and generate executable scripts to monitor the main CPU data in real time;

[0027] When the script detects abnormal data of the main CPU during execution, it will automatically switch from the standby link to the connection with the standby CPU for real-time data communication.

[0028] The specific operation process of this application: building hardware: designed for Siemens S7 414-4H PLC hard redundant system, using TCP communication. Software installation: Install STTP7 and WINC...

Embodiment 2

[0031] The application provides a method for PLC redundancy switching, characterized in that the method comprises the steps of:

[0032] Set the main connection attribute parameters for the communication protocol set in the WINCC project;

[0033] Set the parameters of the standby connection to correspond to the attribute parameters of the main connection, establish the main link, and set the parameters in the main link to be consistent with the information of the main CPU. is 1;

[0034] Write and generate executable scripts to monitor the main CPU data in real time;

[0035] When the script detects abnormal data of the main CPU during execution, it will automatically switch from the standby link to the connection with the standby CPU for real-time data communication.

[0036] Optionally, the main connection attribute parameter includes the MAC address, rack number or connection source of the main CPU.

[0037] Optionally, after the switching to the connection of the backu...

Embodiment 3

[0041] The application provides a method for PLC redundancy switching, characterized in that the method comprises the steps of:

[0042] Set the main connection attribute parameters for the communication protocol set in the WINCC project;

[0043] Set the parameters of the standby connection to correspond to the attribute parameters of the main connection, establish the main link, and set the parameters in the main link to be consistent with the information of the main CPU. is 1;

[0044] Write and generate executable scripts to monitor the main CPU data in real time;

[0045] When the script detects abnormal data of the main CPU during execution, it will automatically switch from the standby link to the connection with the standby CPU for real-time data communication.

[0046] Optionally, the main connection property parameter includes the MAC address, rack number or connection source of the main CPU.

[0047] Optionally, after the switching to the connection of the backup...

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PUM

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Abstract

The invention relates to the technical field of automatic control, in particular to a PLC (programmable logic control) redundancy switching method. Industrial production is a continuous process. During existing PLC redundancy switching, limitations caused by a private network card and software lead to real-time monitoring interruption in a production process, so that the quality of a machined product cannot be guaranteed. The PLC redundancy switching method comprises the following steps: setting main connection attribute parameters for a protocol set in a WINCC item; setting backup connection parameters which correspond to the main connection parameters one by one; writing and generating an executable script, and monitoring main CPU (central processing unit) data; if abnormal data representing faulted communication with a main CPU are monitored, switching to real-time communication of a backup CPU. By real-time monitoring of the main connection attribute parameters, when the received data are abnormal, the main CPU is switched to the backup CPU having the same operation parameters as the main CPU so as to realize timely switching of an operation interface and guarantee successful real-time monitoring in the production process.

Description

technical field [0001] The present application relates to the technical field of automatic control, in particular to a method for PLC redundancy switching. Background technique [0002] Redundancy refers to redundant repetitive or long-winded content (including information, language, code, etc.), and usually refers to increasing the reliability of the system through multiple backups. A large number of programmable logic controllers (PLC) are used as controllers in industrial automation systems. With the development of technology, redundant systems are built to further improve the reliability of the system. At present, there are many redundant classification methods, and there are two types of PLC redundancy methods, namely soft redundancy and hard redundancy. [0003] Soft redundancy means that two CPUs start and run at the same time during system operation, but only the main CPU issues control commands during normal operation, while the backup CPU detects the status of the...

Claims

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Application Information

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IPC IPC(8): G05B19/05
CPCG05B19/058G05B2219/163
Inventor 宋婕谢书霞苗青范者峰
Owner SHANXIN SOFTWARE CO LTD