Three-plus-one redundancy control communication bus method for triplex redundancy control system

Abstract

The invention relates to a three-plus-one redundancy control communication bus method for a triplex redundancy control system. The three-plus-one redundancy control communication bus method is characterized by including step 1, outwards extending a four-way communication interface of each of a control processor, an analog input card, an analog output card, an on-off input card and an on-off output card, and step 2, connecting the four-way communication interfaces of the control processor, the analog input card, the analog output card, the on-off input card and the on-off output card which belong to a same triplex redundancy controller group with a four-way control communication bus in a matrix mode. One control communication bus of the four-way control communication bus is a standby bus. The three-plus-one redundancy control communication bus method has the advantages that safety level of the whole control system is not reduced when a fault point exists in the control communication bus, and at most three fault points are allowed by the control communication bus of the whole system to avoid system breakdown.

Description

technical field [0001] The invention relates to a three-plus-one redundant control communication bus method for a three-redundancy control system. The design of a high-reliability data communication bus for a triple-redundancy control system with high safety requirements belongs to the technical field of automatic control instruments. Background technique [0002] So far, with the continuous development and improvement of 5C technologies - COMPUTER (computer technology), CONTROL (automatic control technology), COMMUNICATION (communication technology), CRT (display technology) and CHANGE (conversion technology), the traditional distributed control system (hereinafter referred to as DCS) or programmable control systems (hereinafter referred to as PLC) are becoming more and more mature, but most of their technologies are based on dual redundancy technology that does not require ultra-high safety, and the control communication bus also adopts dual redundancy remaining technology...

AI Technical Summary

Problems solved by technology

[0004] Since the control communication bus will be connected to quite a few communication devices (IO cards) in practical applications, and it may also be designed out of the cabinet, or even in a harsh environment with multiple sources of interference (such as being arranged with a power supply), Although most control communication buses take many measures to check the communication data packets in order to reduce the probability of interference during design, it is still impossible to avoid the failure of the frame communication, so the probability of residual data errors is greatly increased

With the development of chip semiconductor technology, the reliability and security of the central processing unit (CPU), the core component of the DPU, is getting higher and higher. Decline

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