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Communication control method and device for plc system

A control method and technology of a control device, applied in the direction of data exchange through path configuration, bus network, etc., can solve problems such as poor reliability

Active Publication Date: 2019-10-01
北京龙鼎源科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Embodiments of the present invention provide a communication control method and device for a PLC system to at least solve the technical problem of poor reliability of the communication control method for a PLC system in the prior art

Method used

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  • Communication control method and device for plc system
  • Communication control method and device for plc system
  • Communication control method and device for plc system

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Experimental program
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Embodiment 1

[0028] According to an embodiment of the present invention, an embodiment of a communication control method of a PLC system is provided. It should be noted that the steps shown in the flow chart of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, Also, although a logical order is shown in the flowcharts, in some cases the steps shown or described may be performed in an order different from that shown or described herein.

[0029] Fig. 2 (a) is the communication control method of a kind of PLC system according to the embodiment of the present invention, as shown in Fig. 2 (a), this method comprises the following steps:

[0030] Step S202, when a plurality of slave stations receive the request message sent by the master station through the first preset serial bus through their respective first ports, determine whether there is a slave station whose first port has not failed among the plurality of slave stations ; ...

Embodiment 2

[0052] According to an embodiment of the present invention, an embodiment of a communication control device of a PLC system is also provided, such as Figure 6 As shown, the communication control device of the PLC system includes:

[0053] The first judging unit 601 is used for judging whether there is an unavailable first port among the multiple slave stations when they receive the request message sent by the master station through the first preset serial bus through their respective first ports. The slave station that fails; the first control unit 603, if it is determined that there is a slave station that does not fail at the first port in the plurality of slave stations, then control the slave station that the first port does not fail to send to the master station through the first port Send a response message, wherein the first port is connected to the first preset serial bus; the second judging unit 605 is used to determine that there is no slave station whose first port...

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Abstract

The invention discloses a communication control method of a PLC system and an apparatus thereof. The method comprises the following steps of when a plurality of slave stations receives request messages which are sent by a main station through a first preset serial bus through respective first ports, determining whether there is the slave station whose first port has no fault in the plurality of slave stations; if there is the slave station, making the slave station whose first port has no fault send a response message to the main station through the first port; if there is no slave station, when the plurality of slave stations receives request messages which are sent by the main station through a second preset serial bus through respective second ports, determining whether there is the slave station whose second port has no fault in the plurality of slave stations; and if there is the slave station whose second port has no fault in the plurality of slave stations, making the slave station whose second port has no fault send the response message to the main station through the second port. In the prior art, reliability of the communication control method of the PLC system is poor. By using the method and the apparatus of the invention, the above technical problem is solved.

Description

technical field [0001] The invention relates to the field of automatic control, in particular to a communication control method and device for a PLC system. Background technique [0002] In the field of industrial automation, the safety PLC system usually needs to exchange data between the slave station and the control system of other manufacturers, and Modbus (a bus protocol used in the industrial field) is an open and free protocol, which is easy to understand and It is easy to implement, so it is favored by many automation manufacturers. This protocol can be used as a standard interface protocol between control systems of different manufacturers. [0003] The redundant topology method of the communication process of the existing PLC system is as follows: figure 1 As shown, the specific address, each of the two master stations has a communication interface, and each of the two slave station modules has a communication interface, the communication interface on the master s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L12/40
Inventor 王玥杨昊佐高明
Owner 北京龙鼎源科技股份有限公司