Double-redundancy switch value PLC control system reliable fault-tolerant controller realization method

A fault-tolerant controller and control system technology, applied in the direction of electrical testing/monitoring, etc., can solve the problem of high cost, achieve high reliability, improve availability and safety reliability, and meet the needs of synchronization and coordination

Inactive Publication Date: 2016-01-27
NANJING UNIV OF SCI & TECH +1
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  • Abstract
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  • Application Information

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Problems solved by technology

If a dedicated safety redundant PLC controller is used for them, the cost is too high and it is difficult for users to accept it. Therefore, there is an urgent need fo...

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  • Double-redundancy switch value PLC control system reliable fault-tolerant controller realization method
  • Double-redundancy switch value PLC control system reliable fault-tolerant controller realization method
  • Double-redundancy switch value PLC control system reliable fault-tolerant controller realization method

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Embodiment Construction

[0039] In order to better understand the technical content of the present invention, specific embodiments are given together with the attached drawings for description as follows.

[0040]In this embodiment, according to the characteristics of the switch value control of the actual industrial process, the possible faults of the PLC controller composed of the CPU module, the power module and the switch value I / O module are divided into warning faults and serious faults, and the warning faults will not Interrupting the continuous operation of the system can be eliminated by the self-diagnosis and error correction function of the PLC itself, which can be considered as a normal situation; serious faults will cause obvious abnormal changes in the I / O signal of the controller, and the control cannot continue to operate normally. Deal with it in a timely manner. The PLC self-diagnosis module usually handles serious faults by stopping scanning, giving real-time alarms, and disconnecti...

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Abstract

The invention provides a low-cost double-redundancy switch value PLC control system reliable fault-tolerant controller realization method which ensures continuous and reliable operation of the whole system when a main PLC controller fails, and adopts two conventional PLC controllers and a diagnosis decision logic module to form a double-redundancy reliable fault-tolerant controller. The first PLC controller serves as the main controller, and the second PLC controller serves as a standby controller; during normal operation, the main controller controls actual operation action of a controlled object, and the standby controller serves as a hot-standby redundant controller and outputs actual operation action not actually controlling the controlled object and is only used for monitoring the operation of the main controller; when the first PLC controller and an I/O pathway have severe faults, the second PLC controller is switched to be the main controller to maintain the normal operation of the controlled object; and after the PLC controllers having the severe fault recovers, a control flow is switched to serve as the hot-standby redundant controller of the current main controller to monitor the operation of the current main controller.

Description

technical field [0001] The invention relates to the field of reliability design of industrial controllers, in particular to a method for realizing a reliable fault-tolerant controller of a double-redundant switch PLC control system. Background technique [0002] Existing hot standby redundant safety PLC controllers are generally designed for dedicated redundant PLCs. The technical implementation is complex and the cost is high. Usually, it takes several times the price of a non-redundant system. It is suitable for large-scale complex control systems. High reliability requirements; or by adding a dedicated synchronous redundant module, it can realize safe and reliable control of the CPU module failure of the PLC controller, and it is difficult to achieve reliable fault-tolerant control of other external switching I / O modules and control port failures. [0003] However, there are a large number of small and medium-sized switching PLC control systems based on logic control and ...

Claims

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Application Information

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IPC IPC(8): G05B23/02
Inventor 张登峰陆宝春李军张卫曹春平
Owner NANJING UNIV OF SCI & TECH
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