CN201514284U - Temperature sensor with HART communication module - Google Patents
Temperature sensor with HART communication module Download PDFInfo
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- CN201514284U CN201514284U CN2009202360896U CN200920236089U CN201514284U CN 201514284 U CN201514284 U CN 201514284U CN 2009202360896 U CN2009202360896 U CN 2009202360896U CN 200920236089 U CN200920236089 U CN 200920236089U CN 201514284 U CN201514284 U CN 201514284U
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Abstract
The utility model provides a temperature sensor with an HART communication module, which comprises a signal acquisition module, a processor module and an HART communication module connected with the processor module, wherein the output end of the signal acquisition module is connected to the input end of the processor module. The HART communication module comprises a D/A converter ands an HART modem. The temperature sensor with the HART communication module supports an HART communication protocol. A temperature sampling value is transmitted by a current signal with 4-20mA and a high-precision sampling value is further transmitted by HART communication, thus the utility model improves the precision and the transmission reliability of an industrial filed simulation signal.
Description
Technical field
The utility model relates to field of industrial automatic control, is applicable to industrial temperature signals collecting and control, and particularly relevant for a kind of temperature sensor that has the HART communication module.
Background technology
Traditional intelligence sensor or transmitter mainly are the variations that the simulating signal of output 1～5V or 4～20mA is described the needed simulating signals of industry spot such as voltage, temperature, pressure and distance, are subject to interference in the lower and transmission course of the precision of these signals.
Along with the widespread use of electronic technology and fast development of computer technology and field bus technique, novel digital intelligence sensor constantly develops to pinpoint accuracy, high reliability, the adaptive direction of high environment on performance.Yet, owing to analog field device can is used in a large number, and the restriction that preserved value by former investment, the renewal from analog sensor to digital intelligence sensor also needs a very long time.
The utility model content
The purpose of this utility model is to provide a kind of temperature sensor of the HART of having communication module, transmit the temperature sampling value by 4～20mA current signal, further transmit sampling with high precision numerical value, improved the precision of industry spot simulating signal and the reliability of transmission by HART communication.
The utility model proposes a kind of temperature sensor of the HART of having communication module, comprise signal acquisition module, processor module and the HART communication module that is connected with processor module.Wherein, the output terminal of signal acquisition module is connected to the input end of processor module.The HART communication module comprises D/A converter and HART modulator-demodular unit.
Further, above-mentioned signal acquisition module comprises temperature-sensing element, switch unit, signal condition unit and the A/D converting unit that connects successively.
Further, above-mentioned signal acquisition module also comprises the cold junction compensation unit, and the one end is connected in temperature-sensing element, and the other end is connected in described processor module.
Further, the said temperature sensing element is thermal resistance or thermopair.
Further, above-mentioned A/D converting unit is MX7705.
Further, the chip of above-mentioned HART modulator-demodular unit is DS8500.
The beneficial effects of the utility model are that the temperature sensor that has the HART communication module that the utility model proposes is supported HART communication protocol.Transmit the temperature sampling value by 4～20mA current signal, further transmit sampling with high precision numerical value by HART communication.Support the signals collecting of various temperature sensing element, and type that can be by man-machine interface or HART host computer Remote Selection temperature-sensing element and carry out range, the isoparametric setting of benchmark.
Description of drawings
Figure 1 shows that function block schematic diagram according to the temperature sensor of the HART of having communication module of the present utility model.
Figure 2 shows that the circuit theory diagrams of the HART communication module among Fig. 1.
Figure 3 shows that the workflow diagram of the HART communication module among Fig. 1.
Embodiment
For above-mentioned and other purpose, feature and advantage of the present utility model can be become apparent, preferred embodiment cited below particularly, and conjunction with figs. are described in detail below.
Figure 1 shows that function block schematic diagram according to the temperature sensor of the HART of having communication module of the present utility model.As shown in the figure, the temperature sensor that has the HART communication module that present embodiment provided comprises signal acquisition module 10, processor module 11, HART communication module 12 and human-machine interface module 13.
As shown in Figure 1, signal acquisition module 10 comprises temperature-sensing element 100, switch unit 101, signal condition unit 102, A/D converting unit 103 and cold junction compensation unit 104.Wherein, an end of cold junction compensation unit 104 is connected in temperature-sensing element 100, and the other end is connected in processor module 11.
In the present embodiment, temperature-sensing element 100 is supported the thermoelectric occasionally input of thermal resistance unlike signal.Further, corresponding temperature-sensing element 100 without type has corresponding signal condition unit 102.Switch unit 101 is in order to realize the switching between the different passages, and is for example different for the temperature-sensitive principle of thermal resistance and thermopair, selects different changes to send passage to amplify and conditioning to carry out different signals by analog switch.
The temperature sampling value is at last through obtaining high-precision digital signal after 103 conversions of A/D converting unit.In the present embodiment, A/D converting unit 103 is MX7705, and it is low-power consumption, binary channels, serial output analog to digital converter, comprises a sigma-delta modulator with digital filter, can reach 16 bit resolutions.MX7705 has input buffer and programmable gain amplifier (PGA) in the sheet.At dissimilar thermoelectricity occasionally thermal resistance can select different enlargement factors, within its range ability, adjust signal amplitude, improve measuring accuracy.Self calibration and system calibration function make that MX7705 can modified gain and offset error.Digital filter in the sheet provides programmable cutoff frequency and data output rate, handles the output of sigma-delta modulator.
The input end of processor module 11 connects the output terminal of signal acquisition module 10, and promptly signal acquisition module 10 outputs signal to processor module 11.In the present embodiment, processor module 11 has adopted 8 AVR microprocessor ATmega16L of high-performance, low-power consumption, and it has the In-System Programmable Flash of 16K byte, the on-chip SRAM of 1K byte, the EEPROM of 512 bytes.
Figure 2 shows that the circuit theory diagrams of the HART communication module among Fig. 1, please in the lump with reference to figure 1.HART communication module 12 comprises D/A converter 120 and HART modulator-demodular unit 121.
In the present embodiment, D/A converter 120 specifically can be AD421, is connected in processor module 11.As shown in Figure 2, ATmega16L imports AD421 by three-wire interface CLOCK, DATA and LATCH with digital signal, converts the output of 4～20mA analog current to through AD421.
AD421 is the monolithic high-performance digital to analog converter that ADI company releases, and mainly is made up of shift register, voltage adjuster, digital to analog converter and current amplifier.Voltage adjuster is adjusted to manage by amplifier, band-gap reference and external FET and is formed, and can obtain electric current from loop.Digital to analog converter adopts ∑-Δ DAC structure, and 16 digit numeric codes are converted to 4～20mA analog current.AD421 is under the control of clock signal, and shift register reads in the data on the DATA pin one by one, is converted to corresponding current signal, through three grades of filtering of capacitor C 5, C6, C7, satisfies HART signal cutoff frequency duopole low-frequency filter characteristics.The current signal of digital to analog converter output amplifies through precision amplifier, control LOOP TRN pin electric current.
In the present embodiment, the chip of HART modulator-demodular unit 121 is DS8500.This device satisfies the requirement of HART agreement physical layer specification, and integrated 1200Hz/2200HzFSK signal modulation, demodulation function have extremely low power dissipation, and because integrated digital signal processing function only needs external devices seldom.
Specifically, DS8500 receives the HART signal that is superimposed upon on 4～20mA loop.By the low-pass filter that R3 and C11 form, blocked the above high-frequency interferencing signal of 10KHzS.C10 and R4 form Hi-pass filter, have cut off the DC component on the electric current loop, make the AC signal that is superimposed upon on the electric current loop obtain separating.
If DS8500 detects the FSK frequency shift keyed signals, then the signal with 1200Hz is demodulated into " 1 ", and the 2200Hz signal is demodulated into " 0 ", and is transferred to ATmega16L by serial communication, and ATmega16L receives command frame and makes corresponding data processing.Further, DS8500 is connected in the general serial communication interface of ATmega16L, specifically, the interface signal of the general serial transceiver module UART of ATmega16L comprises that carrier wave detects OCD, HART demodulation output D_OUT, imports D_IN and ask to send RTS from the HART modulation of UART.
Subsequently, ATmega16L produces the acknowledgement frame that will beam back through data processing, the digital signal of acknowledgement frame is finished the bandpass filtering and the amplification of received signal through non-essential resistance electric capacity and DS8500 internal circuit, is modulated into the FSK frequency shift keyed signals of corresponding 1200Hz and 2200Hz.The data that modulate are handled the back by pin FSK_OUT output through inner shaping circuit, are coupled to AD421 inside by capacitor C 7, transmit on the loop that is added to then.Wherein, the clock signal of HART modulation comes from the vibration that external crystal produces.
Software design of the present utility model comprises the workflow procedure of measurement and control of temperature program and HART communication module.Wherein, the measurement and control of temperature program comprises that the collection of signal and data filtering processing, range switch and the nonlinear compensation computing.Further, the fuzzy operational method of tabling look-up has been adopted in the nonlinear compensation computing.
Figure 3 shows that the workflow diagram of the HART communication module among Fig. 1.As described in Figure 3, the communication process of HART communication module 12 (see figure 1)s at first sends command frame by main frame (host computer) and initiates, and the utility model uses the method for interrupt call subroutine to finish as slave unit and receives and reply.
The utility model power on or watchdog reset after, master routine at first carries out initialization to HART communication module 12, set UART working method, serial communication baud rate, data frame format, clear and coherent letter buffer zone, open interruption etc., it is set to waiting status afterwards.
When host computer sent order, the carrier wave of DS8500 detected output OCD and becomes low level, triggers UART and interrupts, and program enters receiving course.MCU generates acknowledgement frame and sends into the transmission buffer zone by certain format after finishing the reception, explanation of Host Command and carrying out corresponding operation, once more HART communication module 12 is set to waiting status after finishing transmission.
Concrete case study on implementation only is a preferable case study on implementation of the present utility model described in the utility model, is not to be used for limiting practical range of the present utility model.Be that all equivalences of doing according to the content of the utility model claim change and modification, all should be as technology category of the present utility model.
Claims (6)
1. temperature sensor that has the HART communication module, comprise signal acquisition module and processor module, the output terminal of described signal acquisition module is connected to the input end of processor module, it is characterized in that, also comprise the HART communication module that is connected with processor module, described HART communication module comprises D/A converter and HART modulator-demodular unit.
2. the temperature sensor that has the HART communication module according to claim 1 is characterized in that, described signal acquisition module comprises temperature-sensing element, switch unit, signal condition unit and the A/D converting unit that connects successively.
3. the temperature sensor that has the HART communication module according to claim 2 is characterized in that described signal acquisition module also comprises the cold junction compensation unit, and the one end is connected in temperature-sensing element, and the other end is connected in described processor module.
4. the temperature sensor that has the HART communication module according to claim 2 is characterized in that, described temperature-sensing element is thermal resistance or thermopair.
5. the temperature sensor that has the HART communication module according to claim 2 is characterized in that, described A/D converting unit is MX7705.
6. the temperature sensor that has the HART communication module according to claim 1 is characterized in that, the chip of described HART modulator-demodular unit is DS8500.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202360896U CN201514284U (en) | 2009-09-23 | 2009-09-23 | Temperature sensor with HART communication module |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009202360896U CN201514284U (en) | 2009-09-23 | 2009-09-23 | Temperature sensor with HART communication module |
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| CN201514284U true CN201514284U (en) | 2010-06-23 |
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| CN2009202360896U Expired - Fee Related CN201514284U (en) | 2009-09-23 | 2009-09-23 | Temperature sensor with HART communication module |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102032928A (en) * | 2010-12-15 | 2011-04-27 | 上海工业自动化仪表研究院 | Universal HART (Highway Addressable Remote Transducer) transmitting module and work method |
| CN103235547A (en) * | 2012-01-20 | 2013-08-07 | Ls产电株式会社 | Analog input and output module |
| CN103512676A (en) * | 2013-10-18 | 2014-01-15 | 常州大学 | Temperature sensor based on wireless HART (highway addressable remote transducer) communication technology |
| CN104089633A (en) * | 2014-06-27 | 2014-10-08 | 惠州盛太克仪表有限公司 | Transmitter |
| CN105547523A (en) * | 2014-10-29 | 2016-05-04 | 上海辰竹仪表有限公司 | Functional safety type HART measuring system |
| CN108234407A (en) * | 2016-12-15 | 2018-06-29 | 重庆川仪自动化股份有限公司 | Address card and its processing system and method based on HART protocol |
-
2009
- 2009-09-23 CN CN2009202360896U patent/CN201514284U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102032928A (en) * | 2010-12-15 | 2011-04-27 | 上海工业自动化仪表研究院 | Universal HART (Highway Addressable Remote Transducer) transmitting module and work method |
| CN103235547A (en) * | 2012-01-20 | 2013-08-07 | Ls产电株式会社 | Analog input and output module |
| US10158505B2 (en) | 2012-01-20 | 2018-12-18 | Lsis Co., Ltd. | Analog input and output module |
| CN103512676A (en) * | 2013-10-18 | 2014-01-15 | 常州大学 | Temperature sensor based on wireless HART (highway addressable remote transducer) communication technology |
| CN104089633A (en) * | 2014-06-27 | 2014-10-08 | 惠州盛太克仪表有限公司 | Transmitter |
| CN105547523A (en) * | 2014-10-29 | 2016-05-04 | 上海辰竹仪表有限公司 | Functional safety type HART measuring system |
| CN108234407A (en) * | 2016-12-15 | 2018-06-29 | 重庆川仪自动化股份有限公司 | Address card and its processing system and method based on HART protocol |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100623 Termination date: 20120923 |