Method for avoiding modbus real-time database access conflict

A technology of access conflicts and databases, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve problems such as control failure, and achieve the effect of solving validity problems and solving access conflicts

Inactive Publication Date: 2012-10-10
周明 +1
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  • Abstract
  • Description
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Problems solved by technology

This method can effectively solve the problems of avoiding contro

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  • Method for avoiding modbus real-time database access conflict
  • Method for avoiding modbus real-time database access conflict
  • Method for avoiding modbus real-time database access conflict

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Embodiment Construction

[0051] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific illustrations.

[0052] Such as Figure 5 As shown, the modbus master station system of the multi-console involved in the method of the present invention. It includes a plurality of consoles such as a first console 510 and a second console 520 . Wherein each console (510,520) is all connected with the real-time database 531 of modbus master station 530; The inside of modbus master station 530 is also provided with the instruction buffer zone ( 532, 533). The modbus master station 530 is also connected to several modbus slave stations 540 respectively.

[0053] The specific method of the whole invention is: in the modbus master station, the update operation of the console to the database (corresponding modbus function codes are: 5, 6, 15, 16), the instructions...

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Abstract

The invention discloses a method for avoiding modbus real-time database access conflict. The method comprises the following steps of: performing update operation on a database by a console in a modbus master station, caching an instruction of the update operation in an instruction buffer area, and comparing the instruction with the previous buffer instruction. Only when the instruction is changed, the instruction is updated to the database; the instruction is stored by an instruction buffer; and in a cyclic list of the modbus master station, each update operation instruction aiming at the database has the corresponding instruction buffer, and the buffers are cleared when starting and before entering a cycle. The method can ensure that the sent instruction is accurately executed when two consoles have only one sending instruction in a multi-console modbus system, and the real-time database access conflict is solved.

Description

Technical field: [0001] The invention relates to equipment communication and data processing, in particular to a method for avoiding modbus real-time database access conflicts. Background technique: [0002] In the field of industrial control, modbus has been widely deployed and applied as a mature application protocol. It is very mature in the application of instruments, sensors, electric actuators, etc. Modbus is a request / response protocol that can be implemented on Ethernet, RS232, RS422, RS485, fiber optic, etc. lines. [0003] In field application, generally one or more modbus master stations are connected to field devices (slaves) through RS232, RS422 or RS485 asynchronous serial bus; the console is connected through Ethernet or other bus technology modbus master. On the modbus master station, there is a real-time database, and the commands issued by the console are updated to the real-time database, and the modbus master station will periodically send these comman...

Claims

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Application Information

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IPC IPC(8): G06F17/30
Inventor 周明王可中
Owner 周明
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