A multi-master station token scheduling device, communication method and system based on modbus bus
A dispatching device and communication method technology, applied in the field of gateways, can solve problems such as inability to achieve non-disturbance, limitation of the number of access interfaces, and influence of bus communication data, so as to improve reliability and maintainability, realize device fault isolation, The effect of improving usability
Active Publication Date: 2022-03-01
MINGDU ZHIYUN (ZHEJIANG) TECH CO LTD
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[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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[0028] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the following will clearly and completely describe the technical solutions of the embodiments of the present invention in conjunction with the drawings of the embodiments of the present invention. Apparently, the described embodiments are some, not all, embodiments of the present invention. Based on the described embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
[0029] In the present invention, unless otherwise clearly specified and limited, terms such as "installation", "connection", "connection" and "fixation" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection , or integrally connected; it may be mechanically connected or electrically connected;...
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The invention discloses a multi-master station token scheduling device based on MODBUS bus, which has a first interface, a second interface and a controller, the first interface is connected with the master station, and the second interface is connected with the slave station through the bus Connected with other token scheduling devices, the controller stores a first address information configuration table and a second address information configuration table, the first address information configuration table includes slave station parameters, its own protocol address and a fixed broadcast address, The second address information configuration table includes the own protocol addresses of the remaining token scheduling devices; the controller is configured to sequentially obtain the control right of the MODBUS bus through a preset token rotation method and connect to the corresponding master station for communication. Through the token scheduling mechanism of the multi-master token scheduling device, the MODBUS bus multi-master communication is realized.
Description
technical field [0001] The invention relates to the technical field of gateways, in particular to a MODBUS bus-based multi-master station token scheduling device, communication method and system. Background technique [0002] MODBUS-RTU bus is one of the world's most popular general industrial standard protocols in the industrial field, and it 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 intelligent instruments, etc. 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 carry out digital communication on a MODBUS-RTU bus. This master-slave communication protocol of MODBUS-RTU bus determines that at any time Only one master station can exist for data acquisition. At present, in the actual application of the MODBUS-RTU bus, there are mor...
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IPC IPC(8): H04L12/40H04L12/417H04L41/06
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