Internal module connecting bus for site controlling computer and its realization method

A field control and communication technology, applied in the direction of instrumentation, electrical digital data processing, etc., can solve the problems of complex communication software, excessive communication program overhead, etc., and achieve the effects of convenient use, low manufacturing and use costs, and high reliability

Inactive Publication Date: 2004-09-22
同方泰德国际科技(北京)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this backup serial bus solution will bring double overhead for communication hardware interfaces and communication lines. What is more prominent is that the communication program overhead is too large, which makes the communication software complicated.

Method used

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  • Internal module connecting bus for site controlling computer and its realization method
  • Internal module connecting bus for site controlling computer and its realization method
  • Internal module connecting bus for site controlling computer and its realization method

Examples

Experimental program
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Effect test

Embodiment Construction

[0018] Such as figure 1 As shown, this embodiment takes the connection of four control modules as an example. Modules A to D are control modules in the field control machine, and each control module has software and hardware to complete corresponding tasks. The equipment communicating with the internal modules of the field control machine is composed of a hub 1, a logical operation circuit 2 and a full-duplex bus 4, and the full-duplex bus 4 is an RS422 full-duplex bus.

[0019] The hub 1 is connected to the modules A-D through a full-duplex bus 4 . The logic operation circuit 2 is formed by connecting the "NAND" gate circuit IC25 and the "NAND" gate circuit IC26 in series, and the four input ends of the "NAND" gate circuit IC25 are respectively connected with the four RS422 receivers IC3 and IC7 of the hub 1. , IC11T and IC15 are connected. The output of the "NOT" gate circuit IC26 is connected to the RS422 transmitters IC4, IC8, IC12 and IC16 of the hub 1 through a bus 3 ...

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Abstract

The present invention belongs to site bus technology in automatic system. The internal module connecting bus for site controlling computer includes full duplex bus and concentrator, and the full duplex bus is connected to the concentrator and server as the I / O port of the concentrator; the inputs of logic operation circuit are connected to the input of the concentrator separately and the output of logic operation circuit are connected to the outputs of the concentrator via a bus. The realization method includes the data exchange between the outer module and the concentrator performs in semi-duplex mode via the full duplex bus, coupling the input data from the modules to one bus by the concentrator, and sending the data of the modules via the bus.

Description

technical field [0001] The invention relates to the connection and communication of a field control module in an automation system, in particular to equipment and a realization method for communicating with an internal module of a field control machine. Background technique [0002] The field bus is used in the production site to realize the two-way serial multi-node digital communication between the microcomputerized measuring equipment, and it is widely used in the automation system of manufacturing industry, process industry and transportation and other industries. At present, the field bus usually uses a serial bus topology to realize physical connection, that is, all control units and measurement units are connected to this serial bus in the form of a bus. Although this connection method has the advantage of being simple, a failure somewhere in the bus will lead to a complete breakdown of the system, so its working reliability is poor. Especially in automation systems ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F13/38
Inventor 何国霖董世运卓明戈彦霞武芳瑛
Owner 同方泰德国际科技(北京)有限公司
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