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Diagnosis method for abnormal communication between PC end and PLC end of machine vision detection device

A technology of machine vision detection and diagnosis method, which is applied in the direction of program control, instruments, measuring devices, etc.

Inactive Publication Date: 2018-06-12
TIANJIN PUDA SOFTWARE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has the following problems technically: 1. The computer sends the detection result signal delay problem and the signal loss problem
3. There is a difference in the number of signals sent by the PLC counting and detection software
Once the above three situations occur, when the PLC should perform the elimination action, it does not receive the bad signal sent by the computer and cannot be eliminated normally, resulting in false detection and missed detection during the operation of the detection equipment.
In the normal production process, it will bring hidden dangers to product quality

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0015] The following describes the PC-side detection software, PLC-side coding rules, and the communication rules between PC and PLC.

[0016] PC-side detection software:

[0017] Each picture acquired by the camera is numbered, and the number cycles from 0 to 64. When the detection software starts to detect, the number is forced to 0, and then each time a picture is collected, the picture number is increased by 1; after the number reaches 64, the next The number of a picture starts from 0 again, so it goes round and round. Each numbered picture can be tested in different detection threads. When each detection thread is completed, the detection result of each picture is coded according to the following rules: the first two digits are the picture number, the last two digits For the test results, the good product is 01 and the defective product is 02. For example, if the image No. 13 is detected as unqualified, its code is 1302. Push this code into the stack from the back end acco...

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PUM

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Abstract

The invention relates to a diagnosis method for abnormal communication between a PC end and a PLC end of a machine vision detection device. The method comprises the steps that 1) the PC end cyclicallynumbers each picture of an object to be detected, wherein each picture is acquired by a camera; the PC end codes the detection result of each picture and sequentially pushes the detection results from the back end into a detection result stack; a detection result sending thread is developed; 2) the PLC end cyclically numbers each camera signal and establishes a culling time stack; and 3) automatic diagnosis of abnormal communication between the PC end and the PLC end is carried out.

Description

Technical field [0001] The invention relates to a diagnostic method for detecting abnormal operation of equipment. Background technique [0002] At present, more and more manufacturers use computer and PLC-based machine vision inspection equipment to inspect the quality of their products on industrial production lines. The PC side of this type of testing equipment is equipped with machine vision inspection software, which is responsible for analyzing the product images obtained by the camera to determine whether it is a defective product; the PLC in the equipment is mainly responsible for triggering the camera to take pictures when the product passes and controlling the defective product removal The organization sorts qualified and unqualified products. [0003] In general industrial sites, after the PC-side detection software detects defective products, it will send a level line number to the PLC through the IO card, or send the defined value to the PLC fixed address through the ...

Claims

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Application Information

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IPC IPC(8): G05B19/05G01N21/01G01N21/88
CPCG01N21/01G01N21/88G01N2021/0181G05B19/058
Inventor 于振余天洪亢君
Owner TIANJIN PUDA SOFTWARE TECH
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