A Realization Method of Reliable Fault-Tolerant Controller of Double Redundant Switching Value PLC Control System
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: 2017-12-12
NANJING UNIV OF SCI & TECH +1
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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 for a redundant controller with high safety and reliability, simple normal control operation, and no need to invest in high cost. Redundant Reliable Fault Tolerant Controller
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[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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The invention provides a low-cost method for realizing a reliable fault-tolerant controller of a dual-redundant switch PLC control system, which ensures continuous and reliable operation of the entire system when the main PLC controller fails. It adopts two conventional PLC controllers and a diagnosis The decision logic module constitutes a reliable fault-tolerant controller with dual redundancy. The first PLC controller is used as the main controller, and the second PLC controller is used as the backup controller. During normal operation, the main controller controls the actual operation of the controlled object , the backup controller is used as a hot standby redundant controller, and its output does not actually control the actual operation of the controlled object, but is only used to monitor the operation of the main controller; In the event of a serious failure, the second PLC controller switches to the main controller to maintain the normal operation of the controlled object; after the aforementioned serious failure of the PLC controller recovers, it cuts into the control process as the hot standby redundant controller of the current main controller , to monitor the current operation of the 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 ...
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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