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A method of PLC redundancy switching

A technology of redundant switching and main connection, applied in the direction of digital transmission system, instrument, program control, etc., can solve the problems of real-time monitoring interruption in the production process, unable to monitor the production status in time, etc., to achieve the effect of timely switching

Active Publication Date: 2019-12-03
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 present application provides a method for PLC redundancy switching, characterized in that the method includes the following steps:

[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 main connection attribute parameters, establish the main link, set the parameters in the main link to be consistent with the information of the main CPU, and at the same time, in the standby link, input the MAC address of the standby CPU, and set the rack equipment. is 1;

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

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

[0028] The specific operation process of this application: Build har...

Embodiment 2

[0031] The present application provides a method for PLC redundancy switching, characterized in that the method includes the following steps:

[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 main connection attribute parameters, establish the main link, set the parameters in the main link to be consistent with the information of the main CPU, and at the same time, in the standby link, input the MAC address of the standby CPU, and set the rack equipment. is 1;

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

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

[0036] Optionally, the main connection attribute parameter includes ...

Embodiment 3

[0041] The present application provides a method for PLC redundancy switching, characterized in that the method includes the following steps:

[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 main connection attribute parameters, establish the main link, set the parameters in the main link to be consistent with the information of the main CPU, and at the same time, in the standby link, input the MAC address of the standby CPU, and set the rack equipment. is 1;

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

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

[0046] Optionally, the main connection attribute parameter includes ...

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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 automation control, in particular to a method for redundant switching of PLCs. Background technique [0002] Redundancy refers to redundant repetitive or verbose content (including information, language, code, etc.), and usually refers to increasing the reliability of a system through multiple backups. In industrial automation systems, a large number of programmable logic controllers (PLCs) are used as controllers, and with the development of technology, redundant systems are set up to further improve the reliability of the system. At present, there are many classification methods of redundancy, and there are two types of PLC redundancy methods, namely soft redundancy and hard redundancy. [0003] Software 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 standby CPU detects the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/22
CPCG05B19/058G05B2219/163
Inventor 宋婕谢书霞苗青范者峰
Owner SHANXIN SOFTWARE CO LTD