PLC program monitoring system and method

A monitoring system and program technology, applied in the direction of program control, electrical program control, general control system, etc., can solve problems such as system operation disorder and affect the normal operation of industrial control systems, so as to ensure normal operation, prevent tampering by malicious elements, The effect of ensuring safety

Active Publication Date: 2020-07-17
ZHENGZHOU XINDA JIEAN INFORMATION TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The process control of PLC is achieved by collecting input signals, executing programming programs and output refreshing to drive external execution components accordingly. The correct design of PLC programs plays a vital role in the entire process control system. If mal

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  • PLC program monitoring system and method

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Embodiment Construction

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0034] It should be noted that when a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be an intervening component at the same time.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of the invention. The terms used herein in the description of the present in...

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Abstract

The invention provides a PLC program monitoring system and method, and the system comprises an input unit, a program execution unit, an output unit and a state time sequence monitoring unit of a PLC;the PLC sequentially reads the state of an input signal in a scanning mode through the input unit, and obtains an input state result after verification; the PLC scans and executes the approved programs in sequence through the program execution unit to obtain an output signal state, and transmits the output signal state to the output unit to generate an approved output state result; the state timesequence monitoring unit acquires the approved input state result and the approved output state result and generates time sequence results of the input state and the output state in sequence; and whenthe PLC scans and executes the unapproved programs in sequence, the state time sequence monitoring unit synchronously monitors the unapproved programs in the program execution unit in real time through a time sequence result by utilizing a mechanism of the state time sequence monitoring unit, and judges whether an input state result or an output state result is correct or not. According to the invention, real-time monitoring can be carried out when the PLC executes the written program.

Description

technical field [0001] The invention relates to the technical field of programmable logic controller (PLC), in particular to a PLC program monitoring system and method. Background technique [0002] PLC is a computing device used in industrial automatic control. It is widely used in various industries, ranging from household equipment to aerospace equipment. A typical PLC consists of a dedicated CPU, a memory and a set of input and output ports. It receives the signal from the sensor through the input port, and sends out the control signal through the output port to drive the external equipment connected with it. The PLC control program is placed in the memory, and the activities of the system are driven by the PLC control program. [0003] The process control of PLC is achieved by collecting input signals, executing programming programs and output refreshing to drive external execution components accordingly. The correct design of PLC programs plays a vital role in the en...

Claims

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Application Information

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IPC IPC(8): G05B19/05
CPCG05B19/058G05B2219/14006
Inventor 梁松涛穆佩红彭金辉李顶占江淋马骥
Owner ZHENGZHOU XINDA JIEAN INFORMATION TECH
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