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Input-output terminal continuous controller based on RS485 bus

A RS485 and controller technology, applied in the field of input and output terminal connection controllers, can solve the problems of field devices connected to PLC, etc., and achieve the effects of reducing connection costs, long transmission distance, and ensuring reliability

Inactive Publication Date: 2012-05-30
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, the bus connection not only requires PLC configuration, but also requires the field device itself to support the bus protocol, and many field devices do not support a certain protocol function. Therefore, it is impossible to connect the field device to the PLC with Profibus or DeviceNet field bus.

Method used

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  • Input-output terminal continuous controller based on RS485 bus
  • Input-output terminal continuous controller based on RS485 bus
  • Input-output terminal continuous controller based on RS485 bus

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Embodiment Construction

[0038] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention will be described below in conjunction with the accompanying drawings and embodiments

[0039] figure 1 Provide a kind of structural block diagram of the input and output terminal connecting controller based on RS485 bus line for the present invention;

[0040] see figure 1 , the present invention provides an input and output terminal connection controller based on the RS485 bus, which can realize the signal communication between the programmable controller PLC100 and the field device 200 without the support of the field device to the protocol, specifically including the first A control system 300 and a second control system 400, wherein:

[0041] The first control system 300 is connected with the programmable logic controller PLC100 and the second control system 400 respectively, and is used to collect the signal output by the programmable log...

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Abstract

The invention discloses an input-output terminal continuous controller based on an RS485 bus, which comprises a first control system and a second control system, wherein the first control system is used for acquiring a signal output by a programmable logic controller (PLC), transmits the signal to the second control system through an RS485 bus, meanwhile, receives a signal which is transmitted from the second control system and output by a field device, and retransmits the signal to the PLC; the second control system is used for acquiring a signal output from the field device and transmits the signal to the first control system through the RS485 bus, meanwhile, receives a signal which is transmitted from the first control system and output by the PLC, and retransmits the signal to the field device. The invention can realize the data communication between the field device and the PLC without the support of the field device on the protocol, has the advantages of long transmission distance and reliable data transmission and can realize communication with only two cables. Thus, the invention is of great practical significance on reducing the link cost.

Description

technical field [0001] The invention relates to the technical field of programmable logic controller (PLC) control and communication, in particular to an input and output terminal connection controller based on RS485 bus. Background technique [0002] At present, in order to communicate between multiple controlled devices (i.e., field devices) in industrial sites, traditional input / output I / O devices need to connect the external endpoints of the controlled devices to the endpoints of the programmable controller PLC through wires. Make one-to-one connection, that is, directly connect each signal to the input module of the PLC through the cable, so that there are more nodes to be connected (up to 144). Therefore, this hard-wired connection method requires a lot of energy for on-site assembly and debugging, and in practical applications, due to the long distance between the two and the large number of transmission points, laying cables directly for communication will increase c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B19/418
CPCY02P90/02
Inventor 陈在平倪建云贾超王永刚董恩增
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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