Multi-master asynchronous duplex differential bus and communication method

Abstract

The invention discloses a multi-master asynchronous duplex differential bus and a communication method. Master nodes (namely master processing modules) acquire a control authority to the bus in turn and scan slave nodes (namely input / output (IO) modules), so that each master node has a chance for transmitting data to be transmitted to the corresponding slave node within determined time; each slave node can send the data to be transmitted to the bus within a determined time period, so that all the master nodes can acquire the data; the bus rate is up to 10 Mbps or even higher; the problem of contradiction between the application cost and the communication efficiency of the conventional relevant bus is solved; the multi-master asynchronous duplex differential bus can be applied to a serial backboard bus protocol of industrial control equipment, a distributed control system and a power system relaying protection and automation device, and real-time data exchange between a plurality of master nodes and a plurality of slave nodes as well as between the master nodes in a device can be realized; and the multi-master asynchronous duplex differential bus has the characteristics of multi-master communication, high speed, low cost, high reliability, high duration and good application prospect.

Description

technical field [0001] The invention relates to the technical field of power system control, in particular to a communication bus for IO data transmission of fast real-time short data and slow non-real-time long data for communication between power system relay protection and automation devices. Background technique [0002] In the fields of industrial control equipment, distributed control systems, and power system relay protection and automation devices, the main processing module needs to perform data interaction with multiple input and output modules (referred to as IO modules) to collect the data collected by the IO modules and send The IO module sends commands or data. In order to simplify the design of the control system and improve its reliability, the main processing module and the IO module are usually connected by an IO bus. However, there are often fewer main processing modules and more IO modules in power system protection and control devices. Due to cost reaso...

AI Technical Summary

Problems solved by technology

[0010] The FlexRay bus is a high-speed, deterministic, and fault-tolerant bus technology mainly used in automobiles. The FlexRay bus adopts time-division multiplexing technology, and each access node and data information are assigned a definite time slot. In the time slot, nodes can uniquely access the bus. The main processing module needs at least one pair of differential signal lines, which belongs to half-duplex asynchronous communication and supports multi-master communication. High, and the availability of options for related devices is poor, so it will take a long time for development to be accepted and used, and the practicability is not strong;

[0011] There are other buses such as Profibus, Lonworks, parallel ports, etc., but either the cost is high, or the implementation of the bus is complicated, which is not conducive to the communication development of the power control system. Moderate, high transmission rate, support multi-master communication, occupy less ports of the main processing module, better time certainty, better optional availability, strong technical continuity, strong anti-interference, simple and reliable IO data communication bus

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