A single-controller master-slave network bus controller online switching method

Abstract

The invention discloses an online switching method of a master-slave network bus controller of a single controller. The method comprises the following steps: a current bus controller Ctrlorcurrent sends a controller switching request message to a slave station Ctrlorcandidate; the Ctrlorcandidate replies a controller switching request response message to the Ctrlorcurrent, and switches itself to the bus controller after waiting for tdelay 1; the Ctrlorcurrent switches itself to the slave station after receiving the switching request response message; the Ctrlorcandidate sends switching completion message to the Ctrlorcurrent that has switched to the slave station, reads a reply message of the Ctrlorcurrent after waiting for tdelay 2, if a reply mark is effective, the switch is success, and otherwise, the Ctrlorcandidate switches itself to the slave station again; the Ctrlorcurrent receives the switching completion message of the bus controller sent by the Ctrlorcandidate within a Tswtich time, resets the reply mark and waits for the extraction of the bus controller, and if the Ctrlorcurrent does not receives the switching completion message, the Ctrlorcurrent switches itself to the bus controller again, 1 is added to the switching times, and the switching process is repeated; and a bus fault is alarmed in the case of failure after repeating for N times, and the switching process is ended. The online switching method is simple, feasible, stable and reliable.

Description

technical field [0001] The invention relates to an online switching method of a single-controller master-slave network bus controller, which can be used to solve the problem of bus dynamic switching during operation of a distributed system adopting a master-slave bus architecture. Background technique [0002] With the development and popularization of module design and distributed technology, the method of using bus to build system solutions has become more and more common. Large-scale industrial equipment control systems, multi-point deployment intelligent monitoring systems, and aerospace fields will be used. bus. Bus technology can be divided into star bus, daisy chain bus, and ring bus according to the topology. According to the distribution of bus control rights, it can be divided into master-slave bus, arbitration bus, peer-to-peer bus, etc. Among them, the master-slave bus is widely used in systems with high stability requirements. [0003] In a system with a maste...

AI Technical Summary

Problems solved by technology

And this process is usually not fault-tolerant, such as communication, controller site attribute switching process, etc. may cause unsuccessful switching

When switching fails, it usually results in no controller on the bus, and the bus is silent. In this case, because there is no information transmission on the bus, the designer cannot further diagnose the fault state of the system.

A further solution is to increase the reliability of communication through backup transmission, but this solution cannot solve the situation of site switching failure, so it does not avoid the problem of bus silence

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