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Communication control system

一种通信控制、通信站的技术，应用在传输系统、数字传输系统、安全通信装置等方向，能够解决兼容性不够、不能充分满足开放协议通信要求、不能充分地满足实时性和可靠性等问题

Active Publication Date: 2007-01-10
YOKOGAWA ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Industrial Ethernet (registered trademark) currently does not satisfy the real-time performance or reliability required in process control, making it difficult to provide such a communication control system
[0011] In conventional systems, it is difficult to realize open protocol communication while ensuring real-time and reliability in the following environment: (a) when such process control is used in industrial applications, through Ethernet-based ( Registered trademark) or TCP / IP (Transmission Control Protocol / Internet Protocol) standard protocol communication can not fully meet the needs of real-time and reliability
(b) When connecting to another system, or when using network devices or software widely available in the market, the compatibility of communication through a unique proprietary protocol for real-time and reliability is insufficient
This does not adequately meet the requirements of open protocol communication

Method used

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Examples

Experimental program
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Effect test

no. 1 example

[0124] figure 2 is a block diagram outputting one embodiment of the present invention. exist figure 2 In this case, the communication path 10 is double-multiplexed by the primary path 11 and the secondary path 12 . Communication path 10 is, for example, a control bus of a distributed control system.

[0125] The communication station 20 and the communication stations 31 to 3N are connected to the main path 11 and the sub path 12 .

[0126] The communication station 20 includes a unit 21 for performing communication. figure 1 The embodiments in include a single unit.

[0127] In unit 21, high priority communication section 211 performs high priority communication. The low priority communication section 212 performs low priority communication.

[0128] High-priority communication transmits process data, operating quantities, and alarms, etc. Low-priority communication performs image data transfer, file transfer, and message transfer, etc. High-priority communication tr...

no. 3 example

[0153] Figure 5 is a block diagram showing another embodiment of the present invention.

[0154] exist Figure 5 In , the communication station 40 is connected to the main path 11 and the secondary path 12 .

[0155] The high priority communication section 401 performs high priority communication by using the main path 11 .

[0156] The low priority communication section 402 performs low priority communication by using the sub path 12 .

[0157] The path diagnosis section 403 diagnoses the soundness of the main path 11 and the sub path 12 .

[0158] According to the diagnosis result of the path diagnosis section 403, the switching section 404 switches the communication path between the high-priority communication section 401 and its remote communication partner.

[0159] The restriction section 405 restricts communication by the low priority communication section 402 according to the diagnosis result of the path diagnosis section 403 . For example, the restriction sectio...

no. 4 example

[0172] Figure 6 is a block diagram showing another embodiment of the present invention. Figure 6 A specific structural example of the path diagnosis section is shown.

[0173] exist Figure 6 Among them, the path state storage section 501 stores path state information on whether the communication path originating from the local station is intact at each interface and at each remote station.

[0174] The sending part 502 receives a sending request from the high-priority communication part 401, refers to the path state information in the path state storage part 501, selects a good communication path, and sends data on the communication path.

[0175] In a case where a normal reception response is not received within a predetermined time after data transmission, transmission section 502 assumes that the communication path has failed, and reflects this information to path status information in path status storage section 501 .

[0176] The reception section 503 receives data ...

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Abstract

A communication control system is provided that performs communications satisfying a request for industrial applications and a request for open protocol communications at the same time. To this end, in the invention, a high-priority communication section performing critical communications to provide real time property and reliability, and a low-priority communication section performing communications based on an open standard protocol coexist in a same communication station.

Description

technical field [0001] The present invention relates to a communication control system used in a distributed control system and the like. Background technique [0002] Distributed control systems are used for plant operation control in a variety of fields such as petrochemical, steel, pulp, food, pharmaceutical, and electric power. [0003] figure 1 An example structure of a general distributed control system is shown. [0004] refer to figure 1 , the operation monitoring device 1 and the controller 2 are connected to the control bus 3 . The controller 2 controls the plant 4 under the monitoring of the operation monitoring device 1 . The operation monitoring device 1 is in charge of operating and monitoring the plant. The operation monitoring device 1 displays a screen to perform control operations and monitoring. Depending on the size of the plant, there are several controllers distributed in the plant. The operation monitoring device 1 and the controller 2 communica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/28H04L12/40H04L29/06H04L29/08
CPCH04L12/40143H04L12/40182H04L67/322H04L45/00H04L29/06H04L67/61H04L9/40
Inventor 出町公二江桥博道赤羽国治中岛刚幅口健二村上真之横井丰明本乡健石井昭德十河定俊
Owner YOKOGAWA ELECTRIC CORP
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