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Open bus structure with multi-stage expansion structure

A technology of extended structure and bus structure, applied in the direction of bus network, data exchange through path configuration, electrical components, etc., can solve the problems of the limited number of devices carried by the DCS system and the inability to complete device data communication, etc.

Active Publication Date: 2015-07-01
CHINA NUCLEAR CONTROL SYST ENG
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Problems solved by technology

Therefore, when hundreds of field devices are connected to the system, if the communication interval of each device is 1ms, the entire system communication cycle will exceed 100ms, which means that all device data communication cannot be completed within the limited communication timing cycle. This defect directly As a result, the number of equipment carried in the DCS system is limited

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  • Open bus structure with multi-stage expansion structure
  • Open bus structure with multi-stage expansion structure
  • Open bus structure with multi-stage expansion structure

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Embodiment Construction

[0060] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0061] In order to complete the seamless bridging of heterogeneous buses in the DCS system and realize the expansion of the number of devices under strict timing management, the present invention designs an open multi-level bus system with an extended structure. The invention of the multi-level structure extended bus structure is divided into three parts: bus physical layer design, bus link layer protocol design, bus multi-functional application layer design, the specific design is summarized as follows.

[0062] 1. Invent the bus physical layer of the multi-level expansion structure, and build the system structure of the bus.

[0063] The system controller acts as a master station and the main line of the bus constitutes the first-level physical link layer. On the first-level physical link layer, there can be general slave stations of field d...

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Abstract

The invention belongs to the technical field of an industrial control fieldbus and specifically relates to an open bus structure with a multi-stage expansion structure in a DCS (Data Control System) control system. The whole structure is divided into three parts: a bus physical layer, a bus link layer protocol and a bus multifunctional application layer. Compared with the prior art, the open multi-stage bus system with the expansion structure has the obvious features as follows: under a limited time sequence period, the data communication for a large amount of equipment can be finished; the NIBUS fieldbus with the expansion structure is capable of satisfying the requirement of data inter-communication with a heterogeneous fieldbus; the whole system realizes efficient time sequence management for a large amount of equipment and seamless bridge connection for the heterogeneous fieldbus under the efficient time sequence management, and meanwhile, the data transmission can maintain time determinability feature.

Description

technical field [0001] The invention belongs to the technical field of industrial control field bus, and in particular relates to an open multi-level extended structure field bus structure used in a DCS control system. Background technique [0002] As a fourth-generation process control system, DCS includes multiple computers, multiple intelligent equipment and instruments to form a distributed control system. The data transmission within the system adopts fieldbus technology to realize centralized management and the core idea of ​​decentralized control. [0003] At present, most DCS adopt the closed form of their own private network for the control communication network, and cannot realize network interconnection and information sharing with equipment using other communication networks. The DCS system involved in the present invention refers to the field bus technology. Since the current field bus standards are different, the commonly used buses include Profibus-dp, Modbus,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L29/06H04L29/08H04L12/40
Inventor 申万义石亮李明唐意王怀敬刘瑞叶顺流曹文彬
Owner CHINA NUCLEAR CONTROL SYST ENG
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