CN102032928A - Universal HART (Highway Addressable Remote Transducer) transmitting module and work method - Google Patents
Universal HART (Highway Addressable Remote Transducer) transmitting module and work method Download PDFInfo
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- CN102032928A CN102032928A CN2010105887066A CN201010588706A CN102032928A CN 102032928 A CN102032928 A CN 102032928A CN 2010105887066 A CN2010105887066 A CN 2010105887066A CN 201010588706 A CN201010588706 A CN 201010588706A CN 102032928 A CN102032928 A CN 102032928A
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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
The present invention relates to a kind of transmitter, particularly a kind of universal HART transmitting module.
Background technology
The HART agreement is as a kind of industrial field bus standard agreement, obtained application extensive, the market occupancy volume of HART type intelligence instrument surpasses 50% at present, but still 40% the instrument of having an appointment adopts analog quantity or non-standard digital agreement to export, and these instrument will progressively be substituted by HART agreement or other number bus agreements.
The instrument of these analog quantitys or non-standard digital agreement output is the little special kinds specification of output mostly, or some old products.For making these extraordinary specification product up-gradation is HART type intelligence instrument, generally electronic unit or the HART modular converter that needs customization to match with it.In addition, along with the continuous appearance of multiparameter compound sensor, also need the HART transmitter module can realize the measurement of multiparameter, calculating and output.These compound multi-parameter sensors also are to be made of sensors such as common pressure, differential pressure, temperature.
For this reason, need a kind of universal HART transmitting module of design, a plurality of measurement passages are provided, can match, realize the instrument or the sensor of these special requirements are upgraded to HART type intelligent transducer with various sensors.
Universal HART transmitter module just occurred at the HART technology popularization initial stage.But these early stage general HART modules generally can only be measured and change the single simulation amount, and function is simple, only supports that the order of HART5 agreement and installation is less, cannot support compound multi-parameter sensor and digital sensor.
Summary of the invention
The present invention be directed to the problem of present universal HART transmitter module poor compatibility, a kind of universal HART transmitting module and method of work have been proposed, adopted the method for multi-channel measurement signal measurement, conversion and dynamic-configuration output, a plurality of process measurement values of industry spot are finished measurement, conversion and output, and set up a bi-directional digital communication passage with the upper strata supervisory system, make the upper strata supervisory system can carry out configuration and monitoring in real time to a plurality of process measurement passages at scene.
Technical scheme of the present invention is: a kind of universal HART transmitting module, comprised multi channel signals sampling module, constant voltage/constant current stimulating module, microprocessor module, HART communication module, electric current output module, carried out filtering after the multi channel signals sampling module is sampled to multi-channel analog and numeric type sensor, amplify and send into microprocessor module; The control signal that the constant voltage/constant current stimulating module receives microprocessor module provides driving voltage or electric current for sensor; After microprocessor module calculated, handles and change sampled signal, modulation and the demodulation of finishing the HART signal by the HART communication module outputed to the HART main website, exported 4～20mA loop current to the upper strata control system by the electric current output module.
Described multi-channel analog and numeric type sensor can be voltage, electric current, resistance, frequency measurement signal and bus digital signal.
A kind of universal HART transmitting module method of work, comprise universal HART transmitting module, microprocessor module is set input equipment variable and output dynamic variable, the corresponding fixing and unique equipment variables of the measurement of each input channel or calculated value, each equipment variables comprises measured value, unit, measurement limit, all channel informations of sensor number of input channel, microprocessor module cycle access multi channel signals sampling module, the renewal of equipment variables internal channel property information cycle; Dynamic variable is 4 digital output value: PV(first master variables of universal HART transmitting module regulation), SV(second master variable), TV(the 3rd master variable), QV(the 4th master variable) four, wherein PV will correspond to 4～20mA output, the selected at any time passage of microprocessor module, the digital output value of respective channel will be pointed to and receive to dynamic variable, and then realize the conversion of multi-channel measurement signal measurement and dynamically adjust output.
Beneficial effect of the present invention is: universal HART transmitting module of the present invention and method of work, can support analog-and digital-sensor simultaneously; Realize the dynamic correspondence of measurement/result to simulation and the output of HART numeral; Support the HART communication function and meet HART agreement sixth version standard.
Description of drawings
Fig. 1 is the universal HART transmitting module of a present invention system line graph;
Fig. 2 is the universal HART transmitting module of the present invention hardware module figure;
Fig. 3 is the graph of a relation between the present invention's universal HART transmitting module variable and the dynamic variable;
Fig. 4 is the universal HART transmitting module of the present invention embodiment 1 block diagram;
Fig. 5 is the universal HART transmitting module of the present invention embodiment 2 block diagrams.
Embodiment
System's line of universal HART transmitting module as shown in Figure 1, sensor 101 sends the analog or digital measuring-signal to universal HART transmitting module 102.In system side, universal HART transmitting module 102 output simulations 4～20mA loop current is to upper strata control system 103, and wherein 4～20mA can select the measured value of corresponding any one input channel.Finish simultaneously and HART main equipment 104 between digital communication, realization is to the monitoring of all measuring process values, universal HART transmitting module, a plurality of measurement input channels can be provided, support the multiple sensors output signal simultaneously, comprise differential voltage, single ended voltage, electric current, frequency and bus digital signal, can match with general sensor and compound multi-parameter sensor on the market.
The hardware configuration of universal HART transmitting module has comprised multi channel signals sampling module 202, constant voltage/constant current stimulating module 201, microprocessor module 203, HART communication module 205, electric current output module 204 as shown in Figure 2.The various signals that 202 pairs of sensors of multi channel signals sampling module transmit carry out filtering, amplification and sampling; Constant voltage/constant current stimulating module 201 provides driving voltage or electric current for sensor, and the switching of constant voltage and constant current output is finished by MCU control analog switch; Microprocessor module 203 will be handled the calculating of sampled signal and conversion, the switching of constant voltage/constant current stimulating module, the realization of HART slave unit protocol stack, the control and the driving of analog output module; HART communication module 205 is finished the modulation and the demodulation of HART signal; Electric current output module 204 will be exported 4～20mA loop current.
Fig. 3 has described from the sensor signal to the equipment variables transfer process of dynamic variable again.Microprocessor module 203 is understood cycle access multi channel signals sampling modules 202, obtains the measured value of each passage.Each input channel all has a fixing and unique equipment variables number, makes it and an equipment variables binding.And equipment variables is relevant with dynamic variable, and mapping relations between the two are provided with by No. 51 orders of HART, are kept in the nonvolatile memory.Can read by No. 50 orders of HART, obtain mapping relations between the two.
PV(first master variable in the dynamic variable) measured value with the current value of the final loop current of exporting of correspondence, and is sent to upper strata control system 103.And HART main equipment 104 can obtain the value of each dynamic variable by No. 3 orders of HART, also can utilize the equipment variables related command of HART that the measurement and the relevant information of each equipment variables are monitored, thereby reach the purpose of a plurality of process measurement values of real-time monitoring.
Introduce the notion of " equipment variables " and " dynamic variable " among the HART6." equipment variables " corresponds to the measurement or the calculated value of each input channel, and " dynamic variable " is 4 digital output value: PV(first master variables of HART regulation), SV(second master variable), TV(the 3rd master variable), QV(the 4th master variable) four, wherein PV will correspond to 4～20mA output.
Each input channel all can be bound with a fixing and unique equipment variables.In order to visit all relevant informations of input channel by " equipment variables ", in program design, set up a structure DEVICE_VARIABLE and come " equipment variables " carried out a complete description, comprised the information such as measured value, unit, measurement limit, sensor number of input channel.
In addition, in order to describe " dynamic variable ", designing another structure DYNAMIC_VARIABLE again is described " dynamic variable ", this structure is except needs comprise the pointer pDV of a sensing " equipment variables ", also comprised and the relevant information of electric current output, comprise that DA adjusts coefficient, output mode, digital current value or the like, to embody the output characteristics of " dynamic variable ".
By carrying out No. 51 orders of HART, can change the sensing of pDV pointer, realize the distribution of dynamic variable, can finish the conversion that " equipment variables " arrives " dynamic variable " thus, and then realize conversion of multi-channel measurement signal measurement and the dynamic method of adjusting output.
What Fig. 4 provided is that a digital output type level meter uses the line graph of universal HART transmitting module 402 in system.Level meter 401 links to each other with passage 5 input ports 403 of universal HART transmitting module 402 by its digital output interface.Adopt MODBUS digital communication agreement to come interaction data between the two, transmission mode is the RTU transmission mode, and communication speed is 9600bps.Universal HART transmitting module 402 has adopted the MC9S12E64 of Freescale company as microprocessor 404, utilizes its asynchronous communication mouth to link to each other with input port 403 every 405 backs through light.
Before bringing into operation, at first need to utilize 407 pairs of universal HART transmitting modules 402 of HART main equipment to carry out the configuration configuration, finish measuring unit, measure limit, sensor number, the isoparametric setting of the way of output, these parameter informations all are encapsulated in the structure of a DEVICE_VARIABLE.
In the time of commencement of commercial operation, microprocessor 404 can send the MODBUS request message at regular intervals, after level meter 401 receives request message, will return process measurement information such as liquid level, temperature.Universal HART transmitting module 402 can upgrade the corresponding apparatus variate-value after receiving after these information.
No. 51 orders by HART can change the mapping relations between dynamic variable and the equipment variables, concrete mode is: carry out No. 51 orders of HART, change the pointer that points to the DEVICE_VARIABLE structure that the structure DYNAMIC_VARIABLE be used for describing dynamic variable is comprised, can reach the purpose that changes the mapping relations between dynamic variable and the equipment variables.Simultaneously, microprocessor can deposit current mapping relations in an outside eeprom memory.
What Fig. 5 provided is that a multi-parameter sensor uses the line graph of universal HART transmitting module in system.Multi-parameter sensor 501 will be exported differential pressure, pressure, process temperature, sensor temperature measuring-signal.These analogue measurement signals will enter collecting sensor signal module 503 by the input channel of universal HART transmitting module 502 and sample.Collecting sensor signal module 503 is made up of prime signal conditioning circuit and an AD sampling A, and the AD sampling A is the AD7714 of ADI company.Microprocessor 504 is with cycle access AD7714, to obtain the measured value of each passage.After receiving new measured value, the corresponding apparatus variate-value all can upgrade at every turn, so HART main website 505 can get access to each measured value of multi-parameter sensor 501 in real time by No. 3 orders that send HART.
Claims (3)
1. universal HART transmitting module, it is characterized in that, comprised multi channel signals sampling module, constant voltage/constant current stimulating module, microprocessor module, HART communication module, electric current output module, carried out filtering after the multi channel signals sampling module is sampled to multi-channel analog and numeric type sensor, amplify and send into microprocessor module; The control signal that the constant voltage/constant current stimulating module receives microprocessor module provides driving voltage or electric current for sensor; After microprocessor module calculated, handles and change sampled signal, modulation and the demodulation of finishing the HART signal by the HART communication module outputed to the HART main website, exported 4～20mA loop current to the upper strata control system by the electric current output module.
2. according to the described universal HART transmitting module of claim 1, it is characterized in that described multi-channel analog and numeric type sensor can be voltage, electric current, resistance, frequency measurement signal and bus digital signal.
3. universal HART transmitting module method of work, comprise universal HART transmitting module, it is characterized in that, microprocessor module is set input equipment variable and output dynamic variable, the corresponding fixing and unique equipment variables of the measurement of each input channel or calculated value, each equipment variables comprises measured value, unit, measurement limit, all channel informations of sensor number of input channel, microprocessor module cycle access multi channel signals sampling module, the renewal of equipment variables internal channel property information cycle; Dynamic variable is 4 digital output value: PV(first master variables of universal HART transmitting module regulation), SV(second master variable), TV(the 3rd master variable), QV(the 4th master variable) four, wherein PV will correspond to 4～20mA output, the selected at any time passage of microprocessor module, the digital output value of respective channel will be pointed to and receive to dynamic variable, and then realize the conversion of multi-channel measurement signal measurement and dynamically adjust output.
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| CN103576643A (en) * | 2012-08-10 | 2014-02-12 | Ls产电株式会社 | HART analog input module with differential input stage |
| CN103631182A (en) * | 2013-12-06 | 2014-03-12 | 杭州优稳自动化系统有限公司 | HART (highway addressable remote transducer) communication hardware circuit device and HART communication method by same |
| CN105182131A (en) * | 2015-09-10 | 2015-12-23 | 中国家用电器研究院 | General test platform and test method |
| CN110389566A (en) * | 2018-04-23 | 2019-10-29 | 罗克韦尔自动化技术公司 | General purpose I/O industrial control module is provided |
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Cited By (7)
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Application publication date: 20110427 |