CN101776870A - HART (Highway Addressable Remote Transducer) communication-based intelligent electric operator - Google Patents
HART (Highway Addressable Remote Transducer) communication-based intelligent electric operator Download PDFInfo
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- CN101776870A CN101776870A CN200910247372A CN200910247372A CN101776870A CN 101776870 A CN101776870 A CN 101776870A CN 200910247372 A CN200910247372 A CN 200910247372A CN 200910247372 A CN200910247372 A CN 200910247372A CN 101776870 A CN101776870 A CN 101776870A
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Abstract
The invention discloses an HART (Highway Addressable Remote Transducer) communication-based intelligent electric operator, which comprises an MCU (Microprogrammed Control Unit), a position detection unit, a drive control unit, an HART communication interface and a power supply. The operator is characterized in that the MCU comprises a microprocessor and a sampling circuit; the HART communication interface consists of an MCU interface and a transformer coupling interface; a signal from the sampling circuit and an analog signal from the position detection unit are operated and compared by the MCU, an electric machine is driven to move according to the deviation of the two signals, and the stroke of a valve rod is fed back to the MCU through the position detection unit to form closed-loop control; and an external digital signal processed by an HART modem is sent to the MCU through the HART communication interface. The invention has the advantages that the original cable distribution and control strategy can continue to play roles and the digital signal and the analog signal can realize two-way radio transmission, thereby realizing the functions of configuration, debugging, diagnosis, data management, and the like and being convenient for installation, tuning, maintenance and control so as to further save a great amount of cost.
Description
Technical field
The invention belongs to electric operator control technology field, be specifically related to a kind of intelligent electric actuating mechanism based on the HART communication.
Background technology
Electric operator is one of automatic field three big main instrument, is widely used in industries such as electric power, metallurgy, petrochemical industry, light textile, food, medicine.
Because the HART agreement has the characteristics of compatible with digital signal and simulating signal, under the prerequisite that does not influence simulating signal control, can carry out digital communication, have on-the-spot and remote parameter monitoring function, have incomparable advantage aspect reduction system cost, raising control accuracy and the system reliability.Along with the application of field bus technique in industrial process control field, the networking of automated system, total linearize are megatrend.
Original intelligent electric actuating mechanism can not carry out digital communication by the control of 4～20mA simulating signal, can not satisfy the requirement of modern industry system.The intelligence instrument that has the HART agreement is at present monopolized by The foreign chicken products on the market at home always, because the monopolization of its fancy price and technology, the production cost of domestic enterprise is increased greatly, reduced the competitiveness of enterprise, therefore researched and developed intelligent electric actuating mechanism and have very big realistic meaning based on the HART communication with independent intellectual property right.
Summary of the invention
The objective of the invention is: the problem that can't realize digital communication at existing intelligent electric actuating mechanism, a kind of intelligent electric actuating mechanism based on the HART communication is proposed, on the intelligent electric actuating mechanism basis, increased digital communication functions, digital signal and simulating signal are transmitted under non-interfering situation simultaneously, realize both-way communication.
For achieving the above object, the technical scheme that adopts is: a kind of intelligent electric actuating mechanism based on the HART communication, comprise MCU control module, position detection unit, driving control unit, HART communication interface and power supply circuit, it is characterized in that: the MCU control module comprises microprocessor and sample circuit; The HART communication interface is made of MCU interface and transformer coupled interface; Compare computing from the signal of sample circuit and simulating signal through the MCU control module from position detection unit, output a control signal to the motion of driving control unit drive motor according to both deviations, the stroke of valve rod feeds back to the MCU control module by position detection unit simultaneously and forms closed-loop control; Extraneous digital signal is sent signal into the MCU control module by the HART communication interface after by the HART modem processes.
The data that described HART communication interface sends are amplified through operational amplifier, send into the MCU control module through transformer coupled to 4～20mA direct current signal again.
Described MCU control module is connected with man-machine interface, but described man-machine interface setup parameter exports the MCU control module to, and described MCU control module output state value shows to man-machine interface.
Described power circuit provides power supply by linear power supply.
Described driving control unit is come the drive motor motion by solid-state relay.
Beneficial effect of the present invention is: the present invention is based on the intelligent electric actuating mechanism of HART agreement, at first, original cable arrangements and control strategy can continue to play a role; Secondly, digital signal and simulating signal are transmitted under non-interfering situation simultaneously, realize both-way communication, selectively realize configuration, debugging, functions such as diagnosis and data management, be convenient to install, adjustment, safeguard and control, thereby a large amount of expenses have been saved, in addition, the digital communication of steady arm can provide a large amount of information at a terrific speed, quick diagnosis when this breaks down for system is very important, and can conveniently determine abort situation and reason by comparison and the assessment to process data fastly, and the proposition recovery scenario, strengthened the effect of intelligent electric actuating mechanism in the control field greatly based on the HART agreement.
Description of drawings
The invention will be further described for following Figure of description and embodiment.
Fig. 1 is a principle of the invention block diagram;
Fig. 2 is the intelligent electric actuating mechanism communication interface connection layout based on the HART communication interface.
Embodiment
By Fig. 1 principle of the invention block diagram and Fig. 2 communication interface connection layout as seen, a kind of intelligent electric actuating mechanism based on the HART communication, comprise the power supply circuit 9 of MCU control module 7, position detection unit 2, driving control unit 6 and HART communication interface 4, MCU control module 7 and motor 8, it is characterized in that: MCU control module 7 comprises microprocessor and sample circuit 5; HART communication interface 4 is made of MCU interface and transformer coupled interface; Compare computing from the signal of sample circuit 5 and simulating signal through MCU control module 7 from position detection unit 2, output a control signal to 8 motions of driving control unit 6 drive motor according to both deviations, the stroke of valve rod feeds back to MCU control module 7 by position detection unit 2 simultaneously and forms closed-loop control; Extraneous digital signal is sent signal into MCU control module 7 by HART communication interface 4 after by the HART modem processes.
The data that described HART communication interface 4 sends are amplified through operational amplifier, send into MCU control module 7 through transformer coupled to 4～20mA direct current signal again.
Described MCU control module 7 also joins with man-machine interface, but man-machine interface 3 setup parameters export MCU control module 7 to, and MCU control module 7 output state values are shown by man-machine interface 3.
Described power circuit 9 provides power supply by linear power supply.
Described driving control unit 6 is come drive motor 8 motions by opening solid-state relay.
HART communication interface electric circuit inspection is superimposed upon the frequency signal on 4～20mA direct current signal, demodulates digital signal by MODEM, sends MCU to and handles; The result who handles is the alternating signal of HART semaphore request and is superimposed upon on the direct current signal through HART communication interface circuit 4 modulation conversion, thus the digital communication of realization and external information.Among the present invention, main variables and control information are transmitted by 4～20mA, and under the situation of needs, other procedure parameters, device configuration, calibration and configuration info are visited in the mode of digital communication by the HART agreement.
(1) MCU control module
Inner integrated 12 bit A/D converters of MCU control module, 12 DA converters, can save many peripheral chips, simplify hardware circuit design greatly up to the FLASH storer of 60KB and the RAM of 2KB.
(2) HART communication interface
This interface usefulness MCU and HART MODEM chip development are based on the intelligent electric actuating mechanism of HART communication, and be simple and convenient, dwindled space and cost.The main functional modules of HART MODEM is made up of steering logic, carrier wave detection, modulation and demodulation four parts.The function of it is integrated input filtering and output Shaping can be simplified the reliability that interface circuit design realizes system.
The HART agreement adopts the Bell202 frequency shift keying signal of standard to communicate with 1200 baud rates.Its Physical layer adopts the sinusoidal signal of two kinds of different frequencies (1200Hz and 2200Hz represent binary " 1 " and " 0 " respectively), is superimposed upon on 4～20mA signal to communicate, because the average of sinusoidal signal is 0, therefore can not influence current value.Adopt this mode can make simulating signal and digital signal can carry out two-way communication simultaneously and do not interfere with each other.
The HART communication interface mainly is made of MODEM interface and transformer coupled interface.MCU itself has the communication interface that serial ports can be used as itself and HART MODEM.
Figure 2 shows that MCU and HART communication interface connection layout, semiduplex master slave mode is adopted in HART communication, and this product just can respond as the claim frame that slave unit only receives matching addresses.Do not have communication bus at ordinary times during the free time, HART MODEM detects less than signal of communication, and carrier wave detects output OCD pin and is always low level; When bus (4～20mA direct current signal) goes up the frequency signal that 1200 (± 10) Hz or 2200 (± 2 0) Hz occurs, the bandpass filter of HART MODEM chip A5191 can intercept the frequency signal of this segment limit, therefore just can detect the HART signal of communication, the OCD pin of A5191 is output as high level, and demodulator circuit is demodulated into logic level signal by the output of ORXD pin with the frequency signal of input simultaneously.The P1.6 pin of MCU receives pin with serial ports and links to each other with ORXD with the OCD of A5191 respectively, after MCU detects P1.6 level saltus step from low to high, starts serial ports and receives, and the claim frame data are received by byte one by one with receiving interrupt mode; The HART frequency signal finishes on bus, OCD returns back to low level, the MCU serial ports finishes receiving and closes, MCU resolves, judges the data of receiving, press the claim frame regulation and carry out corresponding operating, result data is packaged as a frame response frame, starts the serial ports transmit mechanism, send one by one by byte with sending interrupt mode.The P1.3 pin of MCU sends pin with serial ports and links to each other with ITXD with the INRTS pin of A5191 respectively, in case the transmit status of entering, the P1.3 pin zero clearing output low level of MCU, control HART MODEM switches to modulation system, be about to serial ports and send the frequency signal that data-modulated becomes 1200Hz or 2200Hz, by the operational amplifier amplification and through transformer coupled on bus, finish a HART communication after the shaping.
What the present invention adopted is semiduplex communication, and the system interconnection structural model according to the OSI organization prescribed is reduced to three-decker with traffic model, i.e. ground floor Physical layer, second layer data link layer and layer 7 application layer.Physical layer specifies the transmission method of signal, transmission medium; Data link layer has been stipulated the form of HART frame, and the link communication function realizes setting up, safeguards, terminates; Application layer regulation HART command set.Order is divided three classes, i.e. generic command, commonly used command and specific command.Generic command provides all and field apparatus function associated, and is the prerequisite function of HART equipment, and these orders comprise: read manufacturing firm and device type; Read initializaing variable and unit; Read the number percent of electric current output and range; Read 4 predefined dynamic variables; Read and write 8 character items, 16 character descriptors, date; Read and write 32 character informations; Read range, unit and damping time constant; Read transducer series number and boundary; The final assembling of read-write number; Write polling address.Commonly used command provides the function in the common multiple field apparatus, but is not that all equipment can provide these functions selectively.Commonly used command comprises reads a group selection of 4 dynamic variables altogether; Write variable damping time; Write range; Calibration measurement (with current measured value zero setting or put maximum range); Fixing output current is set; Carry out self check; Carry out host reset; Adjustment equipment zero point; Write master variable unit; Adjust digital-analog convertor zero point and gain; Output-transfer function is set; The writing sensor sequence number; Write synchronizing code number etc.Specific command only provides at the special function of the field apparatus of this type, and it is peculiar, not compatible to be that the present invention controls oneself.
Because HART agreement predetermined data transfer rate is 1200bit/s, 10 milliseconds around an of character of every transmission, so adopt the mode transceive data of interrupting in the software, all the other times can make MCU handle other affairs.The reception of the USART module of MSP430, transmission buffer memory all can produce independently and interrupt, and program is finished the various processing to the HART information frame in this interruption.In the receiving course of frame, unusual whenever detecting, corresponding state information can be set automatically, program interrupts focusing on mistake, the delay that occurs in the transmission course at timer, and calls corresponding processing procedure according to different request functions.The process of transmitting of information frame similarly, when system works during in group schema, MCU is released news by the timer control cycle, sending the solicited message (detection of OCD carrier wave) that whether has main frame to upload on the first detection line before the data, if do not detect OCD at the appointed time, then can send the form of the relevant information of equipment operation automatically with the HART information frame; If just there is main frame to communicate by letter, then preferentially carries out Host Command, or postpone or cancel the transmission of burst data according to the Host Command type.
Claims (5)
1. based on the intelligent electric actuating mechanism of HART communication, comprise MCU control module (7), position detection unit (2), driving control unit (6) and HART communication interface (4) and power supply circuit (9), it is characterized in that: MCU control module (7) comprises microprocessor and sample circuit (5); HART communication interface (4) is made of MCU interface and transformer coupled interface; Compare computing from the signal of sample circuit (5) and simulating signal through MCU control module (7) from position detection unit (2), output a control signal to driving control unit (6) drive motor (8) motion according to both deviations, the stroke of valve rod feeds back to MCU control module (7) by position detection unit (2) simultaneously and forms closed-loop control; Extraneous digital signal is sent signal into MCU control module (7) by HART communication interface (4) after by the HART modem processes.
2. the intelligent electric actuating mechanism based on the HART communication according to claim 1, it is characterized in that: the data that described HART communication interface (4) sends are amplified through operational amplifier, send into MCU control module (7) through transformer coupled to 4～20mA direct current signal again.
3. the intelligent electric actuating mechanism based on the HART communication according to claim 1, it is characterized in that: described MCU control module (7) is connected with man-machine interface (3), described man-machine interface (3) but setup parameter exports MCU control module (7) to, MCU control module (7) output state value is shown by man-machine interface (3).
4. the intelligent electric actuating mechanism based on the HART communication according to claim 1 is characterized in that: described power circuit (9) provides power supply by linear power supply.
5. the intelligent electric actuating mechanism based on the HART communication according to claim 1 is characterized in that: described driving control unit (6) is come drive motor (8) motion by solid-state relay.
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| CN200910247372A CN101776870A (en) | 2009-12-29 | 2009-12-29 | HART (Highway Addressable Remote Transducer) communication-based intelligent electric operator |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102706411A (en) * | 2012-06-15 | 2012-10-03 | 上海自动化仪表股份有限公司 | Magnetic position material level meter based on HART (highway addressable remote transducer) communication |
| CN103067033A (en) * | 2012-12-28 | 2013-04-24 | 上海自动化仪表股份有限公司 | Highway addressable remote transducer (HART) instrument universal type hand-held drill and method of communication of HART instrument universal type hand-held drill and HART instrument |
| CN107733825A (en) * | 2017-10-16 | 2018-02-23 | 广州中大微电子有限公司 | A kind of ASK demodulator circuits without low pass filter |
| 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 |
| CN113064703A (en) * | 2021-03-17 | 2021-07-02 | 西安热工研究院有限公司 | Batch downloading configuration method oriented to multiple operation cycles |
-
2009
- 2009-12-29 CN CN200910247372A patent/CN101776870A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102706411A (en) * | 2012-06-15 | 2012-10-03 | 上海自动化仪表股份有限公司 | Magnetic position material level meter based on HART (highway addressable remote transducer) communication |
| CN103067033A (en) * | 2012-12-28 | 2013-04-24 | 上海自动化仪表股份有限公司 | Highway addressable remote transducer (HART) instrument universal type hand-held drill and method of communication of HART instrument universal type hand-held drill and HART instrument |
| 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 |
| CN107733825A (en) * | 2017-10-16 | 2018-02-23 | 广州中大微电子有限公司 | A kind of ASK demodulator circuits without low pass filter |
| CN113064703A (en) * | 2021-03-17 | 2021-07-02 | 西安热工研究院有限公司 | Batch downloading configuration method oriented to multiple operation cycles |
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Application publication date: 20100714 |