Digital control system

Abstract

The invention provides a digital control system, relates to the technical field of communication, and solves technical problems of enhancement of communication capacity and communication reliability. The system comprises a back board, and multiple generable logic cards and multiple signal backward-transmission modules which are interconnected with the backboard. All the general logic cards are divided into multiple logic card sequences, wherein one of the logic card sequences is an S sequence, and other logic card sequences are T sequences. In the T sequences, each general logic card is interconnected with all the general logic cards in the same sequence in a point-to-point communication mode and interconnected with the general logic cards of the corresponding positions in other T sequences in the point-to-point communication mode. In the S sequence, all the general logic cards are interconnected in the point-to-point communication mode, and each general logic card is interconnected with the general logic cards of the corresponding positions in all the T sequences in the point-to-point communication mode. The system is great in communication capacity and communication reliability.

Description

technical field [0001] The present invention relates to communication technology, in particular to a digital control system technology. Background technique [0002] Programmable Logic Controller (PLC) has been widely used in the field of industrial control because of its reliability and scalability. Generally speaking, PLC is composed of input and output modules (I / O) and central processing unit (CPU). , send the output result to the on-site control equipment after being conditioned by the output module. With the rapid development of communication technology, the network communication capability of PLC has been greatly enhanced. It not only provides RS422 / 485 serial communication, but also provides various Ethernet interfaces, thus realizing decentralized control functions and data sharing to meet the development of modern industrial control. need. It is worth noting that the basic architecture of PLC technology (originated in the 1970s) has not changed since its incepti...

AI Technical Summary

Problems solved by technology

For this communication bus structure, there are three deficiencies: ① poor real-time performance: at a certain moment, only one input and output module can interact with the processing module; ② poor reliability: since the processing unit only communicates with the input module through this communication bus, The output module performs information interaction. When the communication bus is abnormal, the entire input and output module may be lost, and the PLC and DLC system will completely collapse; ③ Poor scalability: the communication mode of the bus is adopted, and the number of communication stations that the bus can bear Limited by bus drive capability

[0006] To sum up, the existing digital control system has the defects of poor communication capability and poor communication reliability.

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