Collateral temperature measurement method for realizing Modbus transmission

Abstract

The invention discloses a collateral temperature measurement method for realizing Modbus transmission and relates to the field of thermometry. A Modbus main station receives a Modbus request interrupt message of a DCS (Data Communication System) distributed processing unit, the Modbus main station transmits the message to a microprocessor by virtue of a Modbus communication unit, and the microprocessor is capable of measuring channel selection and collecting and disposing AD according to the message; the processed message is transmitted to the Modbus communication unit according to the Modbus response frame demand by virtue of the microprocessor so as to be sent, and the microprocessor is exited and interrupted. Based on the Modbus transmission, the temperature is measured collaterally, one industrial instrument which uses the method can meanwhile measure the temperatures of multiple measuring control points, so that the cost of the instrument is further lowered, the wiring complexity is lowered, the operation is simplified, and the efficiency is improved.

Description

technical field [0001] The invention relates to a temperature measurement method, in particular to a parallel temperature measurement method for realizing Modbus transmission. Background technique [0002] In order to achieve the best performance of the process automation system, it is necessary to strictly control the temperature points in the process by setting multiple temperature measurement points. The traditional monitoring method uses one instrument to monitor one parameter. Therefore, the entire process automation system A large number of temperature instruments need to be installed, and a large number of transmission lines also need to be arranged. If there is a parallel temperature measurement method based on Modbus transmission, when it is applied to temperature measurement instruments, one temperature measurement instrument can be used to replace multiple traditional temperature measurement instruments, then the instrument cost and wiring complexity can be greatl...

AI Technical Summary

Problems solved by technology

[0002] In order to achieve the best performance of the process automation system, it is necessary to strictly control the temperature points in the process by setting multiple temperature measurement points. The traditional monitoring method uses one instrument to monitor one parameter. Therefore, the entire process automation system It is necessary to install a large number of temperature instruments, and also need to arrange a large number of transmission lines

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