CN101221429A - Intelligent electric actuating mechanism based on PROFIBUS-DP field bus - Google Patents
Intelligent electric actuating mechanism based on PROFIBUS-DP field bus Download PDFInfo
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- CN101221429A CN101221429A CNA2007101502541A CN200710150254A CN101221429A CN 101221429 A CN101221429 A CN 101221429A CN A2007101502541 A CNA2007101502541 A CN A2007101502541A CN 200710150254 A CN200710150254 A CN 200710150254A CN 101221429 A CN101221429 A CN 101221429A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention aims to realize the bus communication function of an electric actuator, and provides an intelligent electric actuator based on PROFIBUS-DP field bus. The intelligent electric actuator adopts the high-performance digital signal controller dsPIC6014A made by Microchip Company as the central processing unit (CPU), and consists of a position detection circuit, a central data processing circuit, a motor drive circuit and a PROFIBUS-DP bus interface circuit, wherein the motor drive circuit comprises a photoelectric isolation circuit; the position detection circuit consists of a position transducer, a signal conditioning circuit and an A/D conversion circuit; the position transducer adopts a conductive plastic precision rotating potentiometer with the output end connected with the signal conditioning circuit; the output end of the signal conditioning circuit is connected with the input end of the A/D conversion module of the central data processing circuit; moreover, the output end of the central data processing circuit is connected with the motor drive circuit. An upper computer realizes the monitoring and analysis functions of the operating status of the electric actuator through the PROFIBUS-DP bus.
Description
[technical field]: the invention belongs to industrial instrument control technology field, realize a kind of electric operator based on the PROFIBUS-DP fieldbus.
[background technology]: electric operator series is a Terminal Type control instrument, is used for pressure, flow, temperature are regulated, and is widely used in industries such as large-size chemical, oil, metallurgy, electric power, is the visual plant in the industrial process control.It receives the simulating signal (generally being 4～20mA current signal) of self tuning regulator or the digital signal of host computer, and be converted into electric operator corresponding angular or straight-line displacement output, go to drive actions such as valve, baffle plate, to realize automatic control to various procedure parameters.Compare with international most advanced level, China is starting late aspect the intelligent electric actuating mechanism product development, and less input, and the shaped article of domestic intellectuality, microcomputerization is less at present.But along with the raising day by day of domestic industry automatization level, also more and more higher to the requirement of electric operator technical feature, the Intellectualized electric topworks that presses for a new generation substitutes the product that uses at present, to improve automaticity and production efficiency.
[summary of the invention]: the objective of the invention is to realize the bus communication function of electric operator, a kind of intelligent electric actuating mechanism based on the PROFIBUS-DP fieldbus is provided.
The present invention at first studies the application embedded technology, use the high-speed high-performance embedded microcontroller to realize the high precision and the fast processing of signal, utilize the PROFIBUS-DP communication dedicated chip, realization has the low-cost design proposal of the electric operator of PROFIBUS-DP bus functionality, various data are required to be transferred to host computer according to difference, host computer is by monitoring and the analytic function of PROFIBUS-DP bus realization to the electric operator operation conditions, this kind of electric operator has been realized intelligent communication, characteristics such as intelligent diagnosis make electric operator better adapt to the development of modern industry requirement.
A kind of intelligent electric actuating mechanism based on the PROFIBUS-DP fieldbus provided by the invention comprises;
Position detecting circuit: be used to detect valve aperture of living in position, and detection signal is isolated, sent into central processing circuit after amplification and the filtering;
Central processing circuit: the image data that is used for position detecting circuit is sent into is carried out calculation process, and the control signal of result is transported to motor-drive circuit through the photoelectricity isolated location, realizes the control to motor-drive circuit;
Motor-drive circuit: be used to accept the control signal that central processing circuit is carried, and then the running of control motor, realize the unlatching of valve or close;
PROFIBUS-DP bus interface circuit: be connected with central processing circuit is two-way, and link to each other with host computer with communication cable, upload the motor-drive circuit status information, be convenient to host computer and implement monitoring to host computer by the PROFIBUS-DP bus interface.
Above-mentioned said position detecting circuit comprises:
1) position transducer: employing be the accurate rotational potentiometer of high performance conductive plastics, be used to detect valve aperture of living in position.
Valve opening has corresponding one by one linear relationship with the output voltage values of feedback potentiometer.
2) signal conditioning circuit: to isolate, send into after amplification and the Filtering Processing A/D modular converter input end in the central processing circuit by the voltage signal of position transducer input.
3) A/D change-over circuit: i.e. A/D modular converter in the central processing circuit is made of A/D modular converter on the sheet of 12 precision of the high performance digital signal controller dsPIC6014A of Microchip company.
Above-mentioned said central processing circuit selects for use the high performance digital signal controller dsPIC6014A of Microchip company as the control core, and the data of gathering are carried out calculation process, realizes work such as Electric Machine Control.
Above-mentioned said motor-drive circuit is made up of zero-cross ssr and solid-state relay driving circuit, dsPIC6014A sends control signal by controller, this signal is after driving circuit carries out power amplification, and control solid-state relay turn-on and turn-off realize the rotating control of motor.
Above-mentioned said PROFIBUS-DP bus interface circuit is made of single-chip microcomputer and agreement control chip interface circuit two parts.Single-chip microcomputer and agreement control chip are made of AT89C55WD chip and PROFIBUS-DP agreement control chip SPC3 respectively, SPC3 links to each other with the AT89C55WD single-chip microcomputer by parallel data line and boost line, and link to each other with host computer with communication cable by the PROFIBUS-DP bus interface, realize that bus data transmits.The AT89C55WD single-chip microcomputer is by the data transmission of asynchronous serial communication interface realization with dsPIC6014A.For improving the system reliability level, during design RS-485 interface circuit, select DS75176, and adopt high speed photo coupling HCP7710, HCP0601 to carry out photosignal and isolate as the bus communication chip for driving.
The said intelligent electric actuating mechanism principle of work based on the PROFIBUS-DP fieldbus of the present invention is: control module is controlled and is monitored the electric operator running status, communicate by PROFIBUS-DP bus interface module and host computer, receive the valve position set information of host computer, central processing circuit utilizes given information to move by motor-drive circuit, thereby change valve opening, gather current valve position information by position detecting circuit simultaneously, and be input to central processing circuit, finish the valve position set information and gather current valve position information relatively by central processing circuit, satisfy the dead band requirement up to the two, stop motor-driven.Based on the intelligent electric actuating mechanism of PROFIBUS-DP fieldbus, finish simultaneously by the PROFIBUS-DP bus interface and upload the electric actuator status information to host computer, be convenient to host computer and monitor.
Advantage of the present invention and good effect:
1, utilizes the high performance digital signal process chip to realize the control of electric operator, improve the speed and the precision of control;
2, reduce control hysteresis and the precision defective that causes owing to common single-chip microcomputer processing speed restriction, make the The whole control device have good adjusting function and reliability;
3, this invention hardware circuit is simple, the output trigger pulse is safe and reliable, precision of real time control is high, can improve the stability and the reliability of device greatly;
4, whole electric operator adopts modular design, for alleviating the master controller work load, adopts the frame mode of two CPU, selects the AT89C55WD of atmel corp chip controls SPC3 communication work for use, has improved the reliability of bus communication;
5, electric operator of the present invention has been realized intelligent, total linearize function, has wide market application prospect.
[description of drawings]:
Fig. 1 is based on the one-piece construction synoptic diagram of the intelligent electric actuating mechanism of PROFIBUS-DP fieldbus.
Fig. 2 is the position detecting circuit structural representation of intelligent electric actuating mechanism.
Fig. 3 is the central data treatment circuit structural representation of intelligent electric actuating mechanism.
Fig. 4 is the motor-drive circuit structural representation of intelligent electric actuating mechanism.
Fig. 5 is the PROFIBUS-DP bus interface hardware circuit (1) of intelligent electric actuating mechanism.
Fig. 6 is the PROFIBUS-DP bus interface hardware circuit (2) of intelligent electric actuating mechanism.
[embodiment]:
Embodiment 1:
A kind of intelligent electric actuating mechanism (see figure 1) based on the PROFIBUS-DP fieldbus, it adopts the high performance digital signal controller dsPIC6014A of Microchip company as central processing unit, and whole device is made up of position detecting circuit, central data treatment circuit, motor-drive circuit and PROFIBUS-DP bus interface circuit.Wherein, comprise photoelectric isolating circuit in the motor-drive circuit; Said position detecting circuit is made of position transducer, signal conditioning circuit and A/D change-over circuit; After handling the position transducer voltage signal of gathering, signal conditioning circuit sends into the A/D modular converter input end in the central processing circuit.The output terminal of central data treatment circuit connects the motor-drive circuit that comprises photoelectric isolating circuit, and the output terminal of motor-drive circuit connects the zero-cross ssr input end.
Above-mentioned said position detecting circuit (see figure 2) is made of position transducer, signal conditioning circuit and A/D change-over circuit; What position transducer adopted is the accurate rotational potentiometer of high performance conductive plastics, is used to detect valve aperture of living in position.Valve opening has corresponding one by one linear relationship with the output voltage values of feedback potentiometer.After handling the position transducer voltage signal of gathering, signal conditioning circuit sends into the A/D modular converter input end in the central processing circuit.
Above-mentioned said central data treatment circuit comprises (see figure 3): dsPIC6014A chip, crystal oscillating circuit and reset circuit, reference voltage source circuit; The software program of compiling by setting executive condition, control dsPIC60 steering order; Crystal oscillating circuit provides clock signal to the dsPIC6014A chip; Reset circuit provides power-on reset signal; The reference voltage source circuit provides A/D conversion reference voltage.
Above-mentioned said dsPIC6014A chip comprises that high capacity centre speed flash is deposited, a plurality of 32 bit timing devices and SPI, SCI, CAN multiple interfaces, and 8 road PWM control waves are provided; Crystal oscillating circuit is made of capacitor C 3, C4 and crystal oscillator body U2, is used to the 14A chip to carry out valve location and detects, and send relevant dsPIC6014A chip clock signal is provided.
Above-mentioned said motor-drive circuit (see figure 4) comprises solid-state relay and solid-state relay driving circuit.Be used to finish motor positive and inverse startup, control such as commutate, stop; Solid-state relay driving circuit output terminal D1, D2 control first, second solid-state relay SSR1 respectively, and SSR2 realizes motor positive and inverse control; The just commentaries on classics of output terminal RF0, the RF1 of controller control servomotor, reverse and stop, the topworks position is equated with given valve position.
The single-chip microcomputer of above-mentioned said PROFIBUS-DP bus interface circuit and agreement control chip interface circuit (see figure 5) are selected the AT89C55WD of atmel corp chip controls SPC3 communication work for use, and finish the exchanges data of dsPIC6014A master controller by asynchronous serial communication interface (UART).In the design, for improving the reliability of system, external house dog IMP813 is used for the AT89C55WD microcontroller is protected.For AT89C55WD, SPC3 is equivalent to an external RAM of its expansion.SPC3 inside has address decoding circuitry.This moment DB
7～B
0Be data/address multiplex bus, can produce the data and the address signal of least-significant byte, high four bit address are by AB
0～AB
3Produce, address realm is from 0x1000～0x1FFF, and AB
4～AB
7Produce the chip selection signal of SPC3, have only AB
4～AB
7Be 0 just to choose SPC3 simultaneously.
The agreement control chip RS-485 interface circuit (see figure 6) of above-mentioned said PROFIBUS-DP bus interface circuit, for improving the system reliability level, select DS75176 as the bus communication chip for driving during design, it is one of chip for driving that can satisfy the 12Mbps baud rate few in number.In order to eliminate the external interference signal, adopt high speed photo coupling (can satisfy the 12Mbps baud rate) HCP7710, HCP0601 to carry out photoelectricity and isolate.
Claims (5)
1. the intelligent electric actuating mechanism based on the PROFIBUS-DP fieldbus is characterized in that comprising;
Position detecting circuit: be used to detect valve aperture of living in position, and detection signal is isolated, sent into central processing circuit after amplification and the filtering;
Central processing circuit: the image data that is used for position detecting circuit is sent into is carried out calculation process, and the control signal of result is transported to motor-drive circuit through the photoelectricity isolated location, realizes the control to motor-drive circuit;
Motor-drive circuit: be used to accept the control signal that central processing circuit is carried, and then the running of control motor, realize the unlatching of valve or close;
PROFIBUS-DP bus interface circuit: be connected with central processing circuit is two-way, and link to each other with host computer with communication cable, upload the motor-drive circuit status information, be convenient to host computer and implement monitoring to host computer by the PROFIBUS-DP bus interface.
2. intelligent electric actuating mechanism according to claim 1 is characterized in that described position detecting circuit comprises:
Position transducer: adopt the accurate rotational potentiometer of conductive plastics, be used to detect valve aperture of living in position;
Signal conditioning circuit: to isolate, send into after amplification and the Filtering Processing A/D modular converter input end in the central processing circuit by the voltage signal of position transducer input;
The A/D change-over circuit: i.e. A/D modular converter in the central processing circuit is made of A/D modular converter on the sheet of 12 precision of the digital signal controller dsPIC6014A of Microchip company.
3. intelligent electric actuating mechanism according to claim 1 is characterized in that described central processing circuit comprises: dsPIC6014A chip, crystal oscillating circuit and reset circuit, reference voltage source circuit; The software program of compiling set executive condition control dsPIC6014A chip valve location detected and send relevant steering order; Crystal oscillating circuit provides clock signal to the dsPIC6014A chip; Reset circuit provides power-on reset signal; The reference voltage source circuit provides A/D conversion reference voltage.
4. intelligent electric actuating mechanism according to claim 1 is characterized in that described motor-drive circuit comprises by solid-state relay and driving circuit thereof to form, finish motor positive and inverse startup, commutate, stop control; Two output terminal D1, D2 of driving circuit control first, second solid-state relay SSR1 respectively, and SSR2 realizes motor positive and inverse control; The just commentaries on classics of output RF0, the RF1 of controller control servomotor, reverse and stop, and then control realizes that the topworks position equates with given valve position.
5. intelligent electric actuating mechanism according to claim 1, it is characterized in that described PROFIBUS-DP bus interface circuit is made of single-chip microcomputer and agreement control chip interface circuit two parts, wherein, agreement control chip interface circuit is made of agreement control chip and RS-485 interface circuit; Single-chip microcomputer and agreement control chip are made of AT89C55WD chip and PROFIBUS-DP agreement control chip SPC3; PROFIBUS-DP agreement control chip SPC3 links to each other with the AT89C55WD single-chip microcomputer by parallel data line and boost line, and links to each other with host computer with communication cable by the PROFIBUS-DP bus interface, realizes the bus data transmission; The AT89C55WD single-chip microcomputer is by the data transmission of the dsPIC6014A in asynchronous serial communication interface realization and the central processing circuit; During design RS-485 interface circuit,, select DS75176, and adopt high speed photo coupling HCP7710, HCP0601 to carry out photosignal and isolate as the bus communication chip for driving for improving the system reliability level.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CNA2007101502541A CN101221429A (en) | 2007-11-21 | 2007-11-21 | Intelligent electric actuating mechanism based on PROFIBUS-DP field bus |
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| CNA2007101502541A CN101221429A (en) | 2007-11-21 | 2007-11-21 | Intelligent electric actuating mechanism based on PROFIBUS-DP field bus |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101840209A (en) * | 2010-04-19 | 2010-09-22 | 昂踹克自动化仪表(上海)有限公司 | Intelligent electric actuating mechanism |
| CN101770239B (en) * | 2009-12-29 | 2013-02-06 | 上海自动化仪表股份有限公司 | Intelligent electric actuating mechanism based on Profibus DP superfluous communication technology |
| CN114238193A (en) * | 2022-02-24 | 2022-03-25 | 浙江中控研究院有限公司 | Device for data interaction between PROFIBUS-DP bus and BLVDS bus |
-
2007
- 2007-11-21 CN CNA2007101502541A patent/CN101221429A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101770239B (en) * | 2009-12-29 | 2013-02-06 | 上海自动化仪表股份有限公司 | Intelligent electric actuating mechanism based on Profibus DP superfluous communication technology |
| CN101840209A (en) * | 2010-04-19 | 2010-09-22 | 昂踹克自动化仪表(上海)有限公司 | Intelligent electric actuating mechanism |
| CN114238193A (en) * | 2022-02-24 | 2022-03-25 | 浙江中控研究院有限公司 | Device for data interaction between PROFIBUS-DP bus and BLVDS bus |
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Open date: 20080716 |