Universal HART (Highway Addressable Remote Transducer) transmitting module and work method

Abstract

The invention relates to a universal HART (Highway Addressable Remote Transducer) transmitting module and a work method. After carrying out sampling for a multichannel analog and digital transducer, a multichannel signal sampling module carries out filtration and amplification and sends signals into a microprocessor module. A constant voltage / constant current excitation module receives the control signal of the microprocessor module and supplies the transducer with excitation voltage or current. After the microprocessor module calculates, processes and converts sampled signals, a HART communication module modulates and demodulates HART signals and outputs the HART signals to a HART master station, and a current output module outputs 4-20mA loop current to an upper-layer control system. The universal HART transmitting module adopts a measurement, conversion and dynamic configuration output method for multichannel measurement signals, accomplishes measurement, conversion and output for multiple process measurement values of an industrial site, and forms a bidirectional digital communication channel with the upper-layer control system. Therefore, the upper-layer control system can dynamically configure, monitor and measure the multiple process measurement channels of the site in real time.

Description

technical field [0001] The invention relates to a transmitter, in particular to a general-purpose HART transmitter module. Background technique [0002] As an industrial fieldbus standard protocol, the HART protocol has been widely used. At present, the market share of HART-type smart instruments has exceeded 50%, but about 40% of the instruments still use analog or non-standard digital protocols for output. These instruments will gradually be replaced by HART protocol or other digital bus protocols. [0003] These instruments with analog quantity or non-standard digital protocol output are mostly special varieties and specifications with small output, or some old products. In order to upgrade these products with special specifications to HART-type smart meters, it is generally necessary to customize matching electronic components or HART conversion modules. In addition, with the continuous emergence of multi-parameter composite sensors, the HART transmitter module is also...

AI Technical Summary

Problems solved by technology

[0006] The present invention aims at the problem of poor compatibility of current general-purpose HART transmitter modules, and proposes a general-purpose HART transmitter module and its working method, which adopts the method of multi-channel measurement signal measurement, conversion and dynamic configuration output, and is suitable for industrial sites. The measurement, conversion and output of multiple process measurement values ​​are completed, and a two-way digital communication channel is established with the upper monitoring system, so that the upper monitoring system can configure and monitor the multiple process measurement channels on site.

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