Foundation field bus (FF) H1 temperature measuring device

Abstract

The invention provides a foundation fieldbus (FF) H1 temperature measuring device. The device comprises a temperature sensor, a sensor signal regulating unit, an analog-to-digital conversion unit, a microprocessor, a field bus communication controller and a media connecting unit, wherein the temperature sensor collects temperature of point testing equipment; the sensor signal regulating unit performs signal amplification and filter processing on the temperature collected by the temperature sensor, and transmits the processed signal to the analog-to-digital conversion unit; the analog-to-digital conversion unit performs analog-to-digital conversion on the signal transmitted by the sensor signal regulating unit, and transmits the converted digital signal to the microprocessor; the microprocessor performs linear processing and temperature compensation on the digital signal, and transmits the processed signal to the field bus communication controller; the field bus communication controller converts the signal transmitted by the microprocessor into FF H1 data link layer data, and transmits the data to the media connecting unit; and the media connecting unit converts the data link layer data into physical layer data, and transmits the physical layer data to the FF H1. The device performs transmission by adopting the digital signal, and has strong interference resistance, so the measured temperature is more accurate.

Description

technical field [0001] The invention relates to the field bus technology field, in particular to an FF H1 field bus temperature measuring device. Background technique [0002] Foundation Fieldbus (FF, FOUNDATION Fieldbus) is an all-digital, two-way transmission, multi-point communication, supports bus power supply, and is a communication link for connecting intelligent devices and automation systems. FF fieldbus can be regarded as a field-based local area network (LAN), used to connect various instruments, valve positioners and other intelligent devices, which itself can provide control applications to the entire network. [0003] FF H1 field bus is a low-speed bus specially used for process automation. The communication rate is 31.25Kbps. The transmission signal adopts Manchester encoding, supports bus power supply, and provides intrinsic safety. The topological structure of FF H1 field bus can adopt bus type, tree type and daisy chain type, and it can be mixed topology st...

AI Technical Summary

Problems solved by technology

The laying, inspection and maintenance of cables requires a lot of manpower, material and financial resources, and the cost of the cables themselves is quite high, even greatly exceeding the system equipment in the control room.

Secondly, the existing temperature transmitters use 4-20mA analog signals. Due to the poor anti-interference ability of analog signals, the final data is inaccurate.

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