Mixed redundancy programmable control system based on equipment redundancy and network redundancy

Abstract

The invention relates to the industrial automation control technology field and relates to a mixed redundancy programmable control system based on equipment redundancy and network redundancy. The mixed redundancy programmable control system comprises a main controller mixed redundancy system and a secondary controller mixed redundancy system, and four levels of redundancy, such as double-Ethernet-equipment redundancy, Ethernet equipment redundancy, double-serial-port serial network redundancy and serial equipment redundancy are included. A main controller is a controller of a double-Ethernet port, four-line mechanism realizes mixed redundancy of the main controller, two switching modes of a normal mode and a rapid mode are provided through matching of an Ethernet mode and an I/O mode, and resource synchronization realizes smooothness of role switching. A secondary controller is a double-serial-port controller, according to a mapping relation between main and secondary equipment, one block of redundancy equipment is added to the secondary equipment, so dual redundancy of a serial communication network and equipment is realized. The mixed redundancy programmable control system is advantaged in that cost is low, four-line mechanism and four levels of redundancy are employed to realize mixed redundancy, reliability is high, and different switching modes satisfy different production technology requirements.

Description

technical field [0001] The invention belongs to the technical field of industrial automation control, relates to the safety and reliability requirements of the industrial production process in this field, and particularly relates to a hybrid redundant programmable control system based on equipment redundancy and network redundancy. Background technique [0002] Redundancy technology is one of the most effective ways to improve the reliability of computer control systems. In order to achieve the unity of high reliability and low failure rate of the control system, we usually use redundancy technology in the design and application of the control system, but at the same time it also increases the complexity of the system, the difficulty of design and the cost, so Reasonable redundant design will greatly improve system reliability and reduce project output cost. [0003] According to the redundant switching mode, the redundant system is roughly divided into: ①Hard redundant mod...

AI Technical Summary

Problems solved by technology

Most of the redundant products currently on the market use hardware redundancy and require dedicated upper computer software for use. This method is more complicated to operate and requires a lot of investment. For engineers who are not familiar with redundancy technology, It increases the configuration and deployment time of the controller network, and also increases the difficulty of debugging the controller product

For soft redundancy products, soft redundancy does not require special redundancy modules or software support, and the cost is low, but it is cumbersome in terms of redundancy implementation and system maintenance, and the speed of general soft redundancy switching is slightly slower. Moreover, the reliability is poor. If the communication link is abnormal, the communication between the active device and the backup device will easily fail, resulting in the failure of the redundancy process.

At the same time, the switching speed of soft redundancy is slow, which is difficult to meet the occasions with high process requirements.

[0004] To sum up, there is currently no perfect redundancy technology that has low cost, high reliability, high speed, and can combine many characteristics such as network redundancy and equipment redundancy.

Images