Mixed-protocol based two-stage topologic structure and field formation method thereof

Abstract

The invention relates to the technical field of field buses, and specifically provides a mixed-protocol two-stage topological structure based field bus system and a construction method thereof. The system is that a first-stage bus structure is a bus type topological structure formed by a Nic-Net main station and a Nic-Net main slave station through a first-stage bus Nic-BUS; a second-stage bus structure is a star shaped topological structure formed by a Nic-Net main slave station and a Nic-Net secondary slave station through a second-stage bus NicLink; the Nic-Net main station comprises a bus application layer, a data link layer and a physical layer; the first-stage bus NicBUS adopts time determination data link control protocol; the Nic-Net main slave station comprises a NicBUS slave station and a NicLink main station; the Nic-Net secondary slave station comprises a bus application layer, a data link layer and a physical layer; two layers of buses NicLink between the Nic-Net main slave station and the Nic-Net secondary slave station adopts the time determination data link control protocol. According to the system, the field bus has the advantages of being high in real-time response performance and high in reliability, and supporting expandability of heterogeneous field buses; the topological structure has the characteristics of being clear in layers, and combining the advantages of the bus type and star type structures.

Description

technical field [0001] The invention belongs to the technical field of field bus, and in particular relates to a two-level topological structure based on a mixed protocol and a field formation method thereof. Background technique [0002] The field bus is a network system and a control system that uses a single scattered digital and intelligent measurement and control equipment as a network node, and is connected by a digital communication bus to exchange information with each other and jointly complete the functions of the automatic control system. [0003] Fieldbus has been widely used in the field of industrial automation control since its birth. Due to different application occasions, various fieldbuses co-exist as technical standards, and interconnection and interchangeability must be overcome between different fieldbus devices to avoid problems caused by field control system integration. The current fieldbus application cases show that there is still no better solutio...

AI Technical Summary

Problems solved by technology

The key is that various fieldbus technologies currently applied do not have good scalability and compatibility with other heterogeneous fieldbus systems in order to achieve technological independence and advanced communication structures, and cannot realize their own fieldbus systems and heterogeneous The data exchange between the line fieldbus systems leads to the inconvenience of the fieldbus in the process of expansion, technology upgrade and maintenance

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