Method for diagnosing input signal fault of PLC system using counter

A technology of input signal and signal failure, applied in general control systems, control/regulation systems, testing/monitoring control systems, etc., can solve problems such as reducing production efficiency, failing to alert operators to equipment failures, and taking long time to deal with failures. The effect of improving response speed and saving troubleshooting time

Active Publication Date: 2019-03-19
河钢数字信达(邯郸)科技有限公司
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  • Abstract
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  • Application Information

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Problems solved by technology

In practical applications, the external input signal of the PLC system often has a "jitter" fault phenomenon, that is, the frequency of the normal signal and the fault is less than 1 second, so because a scan cycle of the PLC system is generally tens of milliseconds, it can capture the signal fault and make it The control equipment stops running. However, since the data communication rate between the

Method used

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  • Method for diagnosing input signal fault of PLC system using counter
  • Method for diagnosing input signal fault of PLC system using counter

Examples

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Example Embodiment

[0016] The present invention will be further described below by means of embodiments in conjunction with the accompanying drawings.

[0017] In an embodiment, a method for using a counter to diagnose a PLC system input signal fault, the steps are as follows:

[0018] Step 1: Counter instruction description. The counting instruction CTU is an output instruction, and the counter structure is shown in Table 1:

[0019] Table 1. Counter structure

[0020] mnemonic

[0021] The CTU instruction counts up. The CTU instruction increments the counter if the up counter enable bit (.CU) is cleared when the instruction is enabled. If the command enable bit (.CU) is set, or the command is disabled, the CTU command retains its accumulated value (.ACC). The accumulated value continues to increment even after the done bit (.DN) is set. If you want to clear the accumulated value, you can use a RES instruction that references the same counter structure, or write 0 to the accumula...

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Abstract

The invention relates to a method for diagnosing an input signal fault of a PLC system by using a counter, and belongs to the technical field of automatic control. The method comprises the steps of assigning the fault diagnosis CTU counter to each input signal causing a controlled device to stop running; using a fault state of the input signal as an enable bit of the CTU counter, setting a presetvalue of the counter as 1, wherein a completion bit (.DN) of the counter is communicated with corresponding signal fault lock; determining the fault cause of the controlled device to stop running by checking the completion bit (.DN) of the fault diagnosis CTU counter and the corresponding signal fault lock. The method has the advantages that a PLC system input signal fault is diagnosed by using acounter programming program in the PLC controller, and the input signal fault can be quickly and accurately locked, thereby saving the fault processing time and improving the response speed of the fault processing.

Description

technical field [0001] The invention relates to a method for diagnosing input signal faults of a PLC system by using a counter, and belongs to the technical field of automatic control. technical background [0002] PLC controller is an electronic device specially designed for digital operation in industrial environment. It uses a memory that can be programmed to store instructions for performing operations such as logic operations, sequential operations, timing, counting, and arithmetic operations, and can control various types of devices through digital or analog inputs and outputs. machinery or production process. PLC controllers have been widely used in various industries such as steel, petroleum, chemical industry, electric power, building materials, machinery manufacturing, automobiles, textiles, transportation, environmental protection, cultural entertainment, etc. It has high reliability, strong anti-interference ability, powerful functions, Flexible, easy to learn ...

Claims

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Application Information

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IPC IPC(8): G05B23/02
CPCG05B23/0221
Inventor 王红彦王伟兵李玉杰苗贵仓李彦峰
Owner 河钢数字信达(邯郸)科技有限公司
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