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multi-master-station token scheduling device, communication method and system based on MODBUS

A technology for dispatching devices and communication methods, which is applied in the field of gateways, can solve problems such as inability to achieve non-disturbance, limited number of access interfaces, and inconvenient installation, so as to improve reliability and maintainability, realize device fault isolation, and reduce workload effect

Active Publication Date: 2020-06-23
MINGDU ZHIYUN (ZHEJIANG) TECH CO LTD
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, this kind of multi-master communication through the use of communication converters has the following disadvantages: each master needs to be connected to the same communication converter, and when the master is far away, it will cause inconvenient installation and difficult wiring; At the same time, each master station needs to be connected to the independent MODBUS-RTU interface on the communication converter, and the number of master stations connected is limited by the number of interfaces; adding or reducing the master station requires changing the configuration of the communication converter. This will affect the communication data of the bus, and can not achieve non-disturbance; in addition, when the communication converter fails, the entire bus will fail, and the system reliability is low

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  • multi-master-station token scheduling device, communication method and system based on MODBUS
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  • multi-master-station token scheduling device, communication method and system based on MODBUS

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Embodiment Construction

[0028] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are some, but not all, embodiments of the present invention. Based on the described embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

[0029] In the present invention, unless otherwise expressly specified and limited, the terms "installed", "connected", "connected", "fixed" and other terms should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection , or integrally connected; it can be a mechanical connection or an electrical connectio...

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Abstract

The invention discloses a multi-master station token scheduling device based on a MODBUS bus. The device comprises a first interface, a second interface and a controller, the first interface is connected with a main station; the second interface is connected with a slave station and other token scheduling devices through a bus; wherein a first address information configuration table and a second address information configuration table are stored in the controller, the first address information configuration table comprises slave station parameters, self-owned protocol addresses and fixed broadcast addresses, and the second address information configuration table comprises self-owned protocol addresses of other token scheduling devices; and the controller is configured to sequentially obtain the MODBUS bus control right through a preset token rotation mode and communicate with the corresponding main station. Through a token scheduling mechanism of the multi-master-station token scheduling device, MODBUS multi-master-station communication is realized.

Description

technical field [0001] The invention relates to the technical field of gateways, in particular to a multi-master token scheduling device, a communication method and a system based on a MODBUS bus. Background technique [0002] MODBUS-RTU bus is one of the most popular general industrial standard protocols in the world, which can be applied to various data acquisition and process monitoring. This protocol supports legacy RS-232, RS-422, RS-485 devices. Many industrial equipment, including PLC, DCS, and smart meters, are using MODBUS-RTU bus. MODBUS-RTU bus communication uses master-slave technology, that is, only one master station and multiple slave stations are allowed to perform digital communication on a MODBUS-RTU bus. The master-slave communication protocol of MODBUS-RTU bus determines that at any time Only one master station can exist for data collection. At present, in the practical application of MODBUS-RTU bus, there are more and more application requirements for...

Claims

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Application Information

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IPC IPC(8): H04L12/40H04L12/417H04L12/24
CPCH04L12/40H04L12/417H04L41/06H04L2012/40228
Inventor 聂浩林宏飞张腾飞占志良徐文卿
Owner MINGDU ZHIYUN (ZHEJIANG) TECH CO LTD
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