PLC (programmed logic controller)-based redundancy system implementation method

An implementation method and technology of redundant system, applied in the field of PLC-based redundant system implementation, can solve the problems of high system cost, no further system research on the redundancy performance of soft redundant system, etc., and achieve low system cost and automatic failure. The effect of identification and positioning, and high system reliability

Inactive Publication Date: 2012-08-15
SHANDONG COMP SCI CENTNAT SUPERCOMP CENT IN JINAN
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Problems solved by technology

At present, soft redundant systems have been widely used in industrial control fields such as metallurgy, transportation, electric power, chemical industry, water pollution, etc., but there is no further systematic research on the redundancy performance of soft redundant systems; hard redundant systems The redundant structure is that all important components are redundantly configured, so the reliability is high, but the disadvantage is that the cost of building the system is also high

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  • PLC (programmed logic controller)-based redundancy system implementation method
  • PLC (programmed logic controller)-based redundancy system implementation method

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Embodiment Construction

[0015] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0016] Such as figure 1 Shown, PLC-based redundant system realization method of the present invention may further comprise the steps:

[0017] First, at least two CPUs with different address codes and at least two I / O modules with different address codes are connected through the CAN bus, that is to say, the data states of all CPUs are automatically synchronized.

[0018] Then start to power on. After power on, each CPU collects data normally, and periodically sends the broadcast frame of the collected data. The principle of priority is adopted, that is, if there are multiple CPUs in the same system, the priority of the module with the smaller address code is higher, as Main CPU; if the CPU receives the broadcast frame of data collected by other CPUs, it compares whether the address of the other party is smaller than the address of the local machine. ...

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Abstract

The invention discloses a PLC (programmed logic controller)-based redundancy system implementation method, wherein the method comprises the following steps: a. at least two CPUs (central processing unit) with different address codes and at least two I/O (input/output) modules with different address codes are connected through a CAN (controller area network) bus; b. after electrification is performed, a main CPU is determined after electrification, and other CPUs are spare CPUs; and c. the main CPU receives data from the I/O modules and sends a broadcast frame, and the spare CPUs only monitor the broadcast frame sent by the main CPU on the CAN bus. The PLC-based redundancy system implementation method provided by the invention has the beneficial effects that according to the invention, redundancy configuration is not required to be adopted for all important components in a PLC system, the system redundancy property can achieve or be close to that of a hardware redundancy PLC system, thus the cost of hardware is saved; the main and auxiliary switching is smooth; automatic fault recognition and positioning can be carried out, and the fault module switching supports hot plug; and the system has high reliability, is easy to implement and is low in cost.

Description

technical field [0001] The invention relates to a PLC-based redundant system realization method. Background technique [0002] A large number of PLCs are used as controllers in industrial automation systems. PLCs are relatively mature and independent controllers. Compared with dedicated controllers, they improve system reliability and reduce the difficulty of system development. However, with the The increase in the complexity of the automation system and the development of technology have put forward further requirements for the reliability of the system. In many fields with strict reliability requirements, a single PLC system can no longer meet the requirements, so the redundant system of PLC is becoming more and more important. [0003] At present, there are many ways to classify redundancy, and there are two main ways of PLC redundancy: soft redundancy and hard redundancy. At present, soft redundant systems have been widely used in industrial control fields such as me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B9/03
Inventor 郝凤琦程广河罗旋孟庆龙韩路跃孙祥李娟
Owner SHANDONG COMP SCI CENTNAT SUPERCOMP CENT IN JINAN
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