CN203376394U - Data acquisition device of multiple intelligent instruments based on HART protocol - Google Patents
Data acquisition device of multiple intelligent instruments based on HART protocol Download PDFInfo
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Abstract
The utility model provides a data acquisition device of multiple intelligent instruments based on an HART protocol. The data acquisition device includes: an aviation plug, a first measuring resistor, an HART modem, an ARM microprocessor, a FLASH chip, a network interface, and a power interface; and more than one aviation plug and more than one first measuring resistor are provided, and the aviation plug is corresponding to the first measuring resistor one-to-one. In the utility model, the FSK signal sent by intelligent instruments is collected, so that the low data acquisition accuracy problem caused by the resistance of the measuring resistor being uncertain is prevented and the data acquisition accuracy is improved; furthermore, in the utility model, two operation modes are provided, namely the operation mode based on the HART protocol and the operation mode based on the voltage signal acquisition to improve performance; the application of the intelligent instrument is improved; and the data acquisition device of the utility model is suitable for the data acquisition device of multiple intelligent instruments.
Description
Technical Field
The utility model relates to a data acquisition technical field specifically relates to a many intelligent instrument data acquisition device based on HART agreement.
Background
The HART (Highway Addressable Remote transmitter) protocol is a communication protocol between field intelligent instruments and control room equipment introduced by rosemont corporation of america in 1985.
The HART protocol employs FSK (Frequency Shift Keying) technology, and digital communication is performed by superimposing FSK signals with amplitude of 0.5mA on current signals of 4-20 mA, wherein the FSK signals employ Be11202 international standard, as shown in fig. 1, 1200Hz represents logic "1", 2200Hz represents logic "0", the signal amplitude is 0.5mA, and the transmission baud rate of the signals is set to 1200 bps. The HART protocol is characterized in that digital signal communication is realized on the existing analog signal transmission line, and the HART protocol belongs to a transitional product in the process of converting an analog system into a digital system, so that the HART protocol has stronger market competitiveness in the transition period of converting the analog system into the digital system and is developed quickly.
A large number of intelligent instruments supporting HART protocols are applied in the performance test process of a steam turbine set, test data of the intelligent instruments need to be recorded and stored in the test process, a measuring resistor is connected to the intelligent instruments in series in the existing measuring method, 4-20 mA current signals output by the intelligent instruments are converted into voltage signals to be collected, however, due to the fact that a certain error exists between the actual resistance value of the measuring resistor and the rated resistance value of the measuring resistor, the collected test data are not accurate enough, and the collection accuracy is not high enough.
SUMMERY OF THE UTILITY MODEL
The utility model provides a main aim at provides a many intelligent instrument data acquisition device based on HART agreement to solve prior art and have the not high enough problem of uncertainty and lead to the data acquisition precision because of measuring resistance's resistance.
In order to achieve the above object, an embodiment of the present invention provides a many intelligent instrument data acquisition devices based on HART protocol, include: the device comprises an aviation plug, a first measuring resistor, an HART modem, an ARM microprocessor, a FLASH chip, a network port and a power interface; the aviation plugs and the first measuring resistors are respectively in one-to-one correspondence; wherein,
the aviation plug is connected with the corresponding first measuring resistor and is used for connecting the intelligent instrument;
the HART modem is respectively connected with the plurality of first measuring resistors and the ARM microprocessor and is used for transmitting uplink and downlink frequency shift keying FSK signals between the intelligent instrument and the aviation plug through the first measuring resistors;
the ARM microprocessor is respectively connected with the HART modem, the FLASH chip, the network port and the power interface, and is used for transmitting a HART request command and a HART response command with the HART modem and sending the acquired intelligent instrument data to the FLASH chip and the network port;
the FLASH chip is used for storing the acquired intelligent instrument data;
the network port is used for connecting a computer and transmitting interaction information between the ARM microprocessor and the computer;
and the power interface is used for connecting an external power supply and supplying power to the ARM microprocessor and the intelligent instrument.
With the aid of the above technical scheme, the utility model discloses a HART protocol communication between data acquisition device and a plurality of intelligent instrument to acquire intelligent instrument's FSK signal and replace the voltage signal who acquires intelligent instrument, compare in prior art, the utility model discloses an FSK signal that acquisition intelligent instrument sent has avoided having the problem that the uncertainty leads to the data acquisition precision to hang down because of measuring resistance's resistance, has improved data acquisition's accuracy, in addition, the utility model provides a two kinds of operating modes, based on HART protocol's operating mode and the operating mode based on voltage signal acquisition promptly have improved intelligent instrument's application performance, are applicable to and carry out data acquisition's scene to a plurality of intelligent instrument.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a schematic diagram of the superimposition of an FSK signal on a current signal in the HART protocol;
FIG. 2 is a schematic connection diagram of the devices inside the multi-intelligent-meter data acquisition device of the present invention;
fig. 3 is a schematic connection diagram of each device inside the data acquisition device according to the first embodiment of the present invention;
fig. 4 is an external schematic view of a data acquisition device according to an embodiment of the present invention;
fig. 5 is a schematic connection diagram of each internal device of the data acquisition device according to the second embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
The utility model provides a many intelligent instrument data acquisition device based on HART agreement for carry out data acquisition to N (N is the natural number, and N is more than or equal to 2) a smart meter (when in service, the smart meter quantity that connects can be less than N), as shown in FIG. 2, this many intelligent instrument data acquisition device includes: an aviation plug 201, a first measuring resistor 202, a HART modem 203, an ARM microprocessor 204, a FLASH chip 205, a network port 206 and a power interface 207; the number of the aviation plugs 201 is N, and the aviation plugs and the first measuring resistors 202 are in one-to-one correspondence; wherein,
the aviation plug 201 is connected with the corresponding first measuring resistor 202 and is used for connecting an intelligent instrument;
the HART modem 203 is respectively connected with the N first measuring resistors 202 and the ARM microprocessor 204 and is used for transmitting uplink and downlink frequency shift keying FSK signals between the intelligent instrument and the intelligent instrument through the first measuring resistors 202 and the aviation plug 201;
the ARM microprocessor 204 is respectively connected with the HART modem 203, the FLASH chip 205, the network port 206 and the power interface 207, and is used for transmitting HART request commands and HART response commands with the HART modem 203 and transmitting the acquired intelligent instrument data to the FLASH chip 205 and the network port 206;
the FLASH chip 205 is used for storing the acquired intelligent instrument data;
the network port 206 is used for connecting a computer and transmitting interaction information between the ARM microprocessor 204 and the computer;
and the power interface 207 is used for connecting an external power supply and supplying power to the ARM microprocessor 204 and the intelligent instrument.
The utility model discloses in, many intelligent instrument data acquisition device based on HART agreement is connected with outside N intelligent instrument through N aviation plug 201, wherein, aviation plug 201, first measuring resistor 202, be the relation of one-to-one between the intelligent instrument three (following aviation plug 201 with corresponding, first measuring resistor 202, the intelligent instrument is called a combination), in each combination, the intelligent instrument establishes ties with first measuring resistor 202 and forms the current loop, the current signal that the intelligent instrument sent and the FSK signal of stack on this current signal transmit on this current loop.
The utility model discloses in, many intelligent instrument data acquisition device based on HART agreement passes through network port 206 and is connected with external computer, user's accessible computer sends the order to ARM microprocessor 204, for example, the computer sends ARM microprocessor 204 with the polling order and the polling frequency that the user set up in advance through network port 206, and ARM microprocessor 204 sends each intelligent instrument data of gathering for the computer through network port 206, so that the user carries out analysis processes to each intelligent instrument data through the computer.
The utility model provides a many intelligent instrument data acquisition device based on HART agreement's theory of operation as follows:
step A1, the ARM microprocessor 204 polls each combination according to a preset sequence, when a certain combination is polled, the ARM microprocessor 204 controls the aviation plug 201 in the combination to be opened, so that the connection with the intelligent instrument in the combination is realized, and meanwhile, the ARM microprocessor 204 controls the aviation plugs 201 in other combinations to be closed, so that the isolation from other intelligent instruments is realized; in the step, the polling sequence can be set according to actual needs, and because the polling frequency is generally very high, the time consumed for data acquisition of each intelligent instrument in one polling is very short, so that the user looks like to perform data acquisition on N intelligent instruments at the same time;
a step a2, when polling a certain combination, the ARM microprocessor 204 determines the type of smart meter data to be currently collected, generates a HART request command (a digital signal consisting of logic "1" and "0") according to the HART protocol, and sends the HART request command to the HART modem 203;
step A3, the HART modem 203 receives the HART request command, modulates it into uplink FSK signal of 1200Hz or 2200Hz, and sends it to the current loop formed by the first measuring resistor 202 and the intelligent instrument;
step A4, the combined intelligent instrument receives the uplink FSK signal through the current loop, then analyzes the uplink FSK signal according to the HART protocol, determines the data type currently requested by the ARM microprocessor 204, generates the corresponding data into the downlink FSK signal, and sends the downlink FSK signal to the current loop;
step a5, the HART modem 203 receives the downlink FSK signal through the aforementioned current loop, demodulates it into a HART response command (a digital signal composed of logic "1" and "0"), and then sends it to the ARM microprocessor 204;
step A6, the ARM microprocessor 204 receives the HART response command, and analyzes the HART response command according to the HART protocol to obtain the data of the intelligent instrument in the combination;
in step A7, the ARM microprocessor 204 continues to poll the next combination and repeats steps A2-A6.
The utility model discloses a and HART protocol communication between a plurality of intelligent instrument to the FSK signal that acquires intelligent instrument replaces the voltage signal who acquires intelligent instrument, compares in prior art, the utility model discloses avoided because of there being the problem that the error leads to the data acquisition precision low between the actual resistance of first measuring resistor 202 and its rated resistance, in addition, the utility model provides a many intelligent instrument data acquisition device can give outside computer with the intelligent instrument data transmission who gathers to the user uses the computer to carry out analysis processes to the data of gathering, consequently, the utility model is suitable for a measuring point is more, the great condition of data acquisition volume.
In a preferred embodiment, the utility model provides a many smart meters data acquisition device still includes: n second measuring resistors correspond to the aviation plug 201 and the first measuring resistors 202 one by one; wherein,
the second measuring resistor is respectively connected with the corresponding aviation plug 201 and the first measuring resistor 202;
the digital-to-analog converter is connected to the N second measuring resistors and the ARM microprocessor 204, and is configured to send voltage value information at two ends of the N second measuring resistors to the ARM microprocessor 204.
It is specific, a second measuring resistor has been add in above-mentioned every combination, to every combination, because the voltage signal at current signal accessible second measuring resistor both ends that smart meter sent reflects, consequently the utility model discloses can also when polling a certain combination, gather the voltage signal at second measuring resistor both ends in this combination through digital analog converter to convert it to digital magnitude of voltage information and send for ARM microprocessor 204, then ARM microprocessor 204 carries out the range conversion to digital magnitude of voltage information, obtains this combination smart meter's data. Therefore, in addition to obtaining smart meter data through HART protocol communication between the ARM microprocessor 204 and the smart meter, the present embodiment may also obtain smart meter data by collecting a voltage signal across the second measuring resistor as in the prior art, that is, the present embodiment provides a working mode based on HART protocol and a working mode based on voltage signal collection.
The utility model discloses in, to each combination, first measuring resistor 202 and second measuring resistor's resistance needs set up according to HART modem 203, digital analog converter and intelligent instrument's normal work needs, and the two resistance can be the same or different.
It should be noted that, for a certain combination, when the resistance values of the first measuring resistor 202 and the second measuring resistor set according to the normal operation requirements of the HART modem 203, the digital-to-analog converter and the smart meter are the same, the HART modem 203 and the digital-to-analog converter may share the same measuring resistor. In a preferred embodiment, the utility model provides a many smart meters data acquisition device still includes: and the digital-to-analog converter is respectively connected with the N first measuring resistors 202 and the ARM microprocessor 204, and is configured to send the voltage value information at two ends of the N first measuring resistors 202 to the ARM microprocessor 204.
In a preferred embodiment, the utility model provides a many intelligent instrument data acquisition devices still includes: and the voltage transformation device is respectively connected with the power interface 207 and the ARM microprocessor 204.
Specifically, considering that the smart meter and the ARM microprocessor 204 may use different operating voltages, the present embodiment converts the original voltage provided by the power supply into the voltage required by the ARM microprocessor 204 by connecting a voltage transformation device between the power interface 207 and the ARM microprocessor 204.
In a preferred embodiment, the utility model provides a many intelligent instrument data acquisition devices still includes: and the clock chip is connected with the ARM microprocessor 204.
Specifically, the clock chip may provide a clock function for the ARM microprocessor 204, so that the ARM microprocessor 204 polls each combination according to a set sequence and frequency.
In a preferred embodiment, the utility model provides a many intelligent instrument data acquisition devices still includes: and the LED indicator light is connected with the ARM microprocessor 204.
Specifically, for making the user know this many intelligent instrument data acquisition device's operating condition more conveniently, the utility model discloses can set up a N LED pilot lamp to trigger different LED pilot lamps by ARM microprocessor 204 and show and remind the current data acquisition device of user to locate different operating conditions, for example, set up a LED pilot lamp to each combination, when the LED pilot lamp in this combination shows, the expression is carrying out data acquisition to the intelligent instrument in this combination.
Example one
This embodiment provides a specific many intelligent instrument data acquisition device based on HART agreement (hereinafter referred to as the device for short), is used for carrying out data acquisition to N (N is the natural number, and N is more than or equal to 2) intelligent instrument (when in actual use, the intelligent instrument quantity that connects can be less than N), as shown in fig. 3 for the connection schematic diagram of each device in the device, the device includes: an aviation plug 301, a first measuring resistor 302, a HART modem 303, an ARM microprocessor 304, a FLASH chip 305, a network port 306, a power interface 307, a second measuring resistor 308, a digital-to-analog converter 309, a voltage transformation device 310, a clock chip 311 and an LED indicator light 312; the number of the aviation plugs 301, the first measuring resistors 302, the second measuring resistors 308 and the LED indicator lamps 312 is N, the aviation plugs 301, the first measuring resistors 302, the second measuring resistors 308, the LED indicator lamps 312 and the intelligent instruments are in one-to-one correspondence with the N intelligent instruments connected with the device, and the corresponding aviation plugs 301, the first measuring resistors 302, the second measuring resistors 308, the LED indicator lamps 312 and the intelligent instruments form a combination; fig. 4 is a schematic external view of the device.
As shown in fig. 3, in the present embodiment, the apparatus is connected to the smart meter through the aviation plug 301, specifically, the aviation plug 301 in each combination is connected to the corresponding smart meter;
in the device, a power interface 307 is connected with the ARM microprocessor 304 through a voltage transformation device 310, and outside the device, the power interface 307 is connected with each intelligent instrument; when in use, the power interface 307 is connected with an external power supply, and can supply power to the ARM microprocessor 304 and each intelligent instrument;
for each combination, the aviation plug 301, the first measuring resistor 302 and the second measuring resistor 308 are connected in series, and when the intelligent instrument is connected with the aviation plug 301, the first measuring resistor 302, the second measuring resistor 308 and the intelligent instrument form a current loop together;
the HART modem 303 is respectively connected with each aviation plug 301 and the ARM microprocessor 304; when the ARM microprocessor 304 polls a certain combination, if the combination is an uplink, the HART modem 303 modulates the HART request command sent by the ARM microprocessor 304 into an uplink FSK signal, and sends the uplink FSK signal to the current loop of the combination through the first measuring resistor 302 in the combination, so that the smart meter in the combination receives the uplink FSK signal; if the signal is downlink, the HART modem 303 receives a downlink FSK signal sent to the current loop by the smart meter through the first measuring resistor 302 in the combination, demodulates the downlink FSK signal to form a HART response command, and then sends the HART response command to the ARM microprocessor 304;
the digital-to-analog converter 309 is respectively connected with each second measuring resistor 308 and the ARM microprocessor 304; when the ARM microprocessor 304 polls a certain combination, the digital-to-analog converter 309 acquires voltage signals at two ends of the second measuring resistor 308 in the combination under the trigger of the ARM microprocessor 304, and performs analog-to-digital conversion on the voltage signals to obtain digital voltage value information which is then sent to the ARM microprocessor 304;
the ARM microprocessor 304 is respectively connected with the HART modem 303, the digital-to-analog converter 309, the network port 306, the FLASH chip 305, the clock chip 311, each LED indicator lamp 312 and the voltage transformation device 310; when the ARM microprocessor 304 polls a certain combination, if the working mode based on the HART protocol obtains the data of the smart meter, the ARM microprocessor 304 sends a corresponding HART request command to the HART modem 303 according to the type of the data of the smart meter to be obtained, and receives a HART response command returned by the HART modem 303, thereby obtaining the data of the smart meter in the combination according to the HART response command; if the data of the intelligent instrument is acquired based on the working mode of voltage signal acquisition, the ARM microprocessor 304 triggers the digital-to-analog converter 309 to start working, and receives digital voltage value information returned by the digital-to-analog converter 309, so that the data of the intelligent instrument in the combination is acquired according to the digital voltage value information;
the FLASH chip 305 is used for storing the data of each intelligent instrument acquired by the ARM microprocessor 304;
inside the device, the network port 306 is connected with the ARM microprocessor 304, and outside the device, the network port 306 is used for connecting a computer; when in use, the network port 306 is used for transmitting interaction information between the ARM microprocessor 304 and a computer;
the clock chip 311 provides a clock signal for the ARM microprocessor 304;
the LED indicator lights 312 are controlled by the ARM microprocessor 304 to indicate to the user the operational status of the device, for example, when the LED indicator lights 312 in a certain combination are displayed, indicating that the device is performing data collection on the smart meters in that combination.
This embodiment has realized the HART protocol communication between data acquisition device and the N intelligent instrument, replace the voltage signal who acquires intelligent instrument with the FSK signal who acquires intelligent instrument, compare in prior art, this embodiment has avoided having the problem that the data acquisition precision is low because of measuring resistance's resistance has uncertainty through the FSK signal who gathers intelligent instrument and send, data acquisition's accuracy has been improved, furthermore, this embodiment provides two kinds of mode, promptly based on HART agreement's mode and the mode based on voltage signal acquisition, the application property of intelligent instrument has been improved, be applicable to the scene that carries out data acquisition to N intelligent instrument.
Example two
This embodiment provides another specific HART protocol-based data acquisition device for multiple intelligent meters (hereinafter referred to as the device) for acquiring data of N (N is a natural number, and N is greater than or equal to 2) intelligent meters (when in actual use, the number of connected intelligent meters may be less than N), as shown in fig. 5, a connection diagram of each device inside the device is provided, and the device includes: an aviation plug 501, a measuring resistor 502, a HART modem 503, an ARM microprocessor 504, a FLASH chip 505, a network port 506, a power interface 507, a digital-to-analog converter 508, a voltage transformation device 509, a clock chip 510 and an LED indicator lamp 511; the number of the aviation plugs 501, the measuring resistors 502 and the LED indicating lamps 511 is N, the aviation plugs 501, the measuring resistors 502 and the LED indicating lamps 511 correspond to N intelligent instruments connected with the device one by one, and the corresponding aviation plugs 501, the measuring resistors 502, the LED indicating lamps 511 and the intelligent instruments form a combination.
The difference between this embodiment and the first embodiment is that the HART modem 503 and the digital-to-analog converter 508 share the same measuring resistor 502 in this embodiment.
The specific working principle of the data acquisition device for multiple intelligent meters provided by the embodiment can be referred to as embodiment one, and is not described herein again.
The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (6)
1. A many intelligent instrument data acquisition device based on HART agreement, its characterized in that includes: the device comprises an aviation plug, a first measuring resistor, an HART modem, an ARM microprocessor, a FLASH chip, a network port and a power interface; the aviation plugs and the first measuring resistors are respectively in one-to-one correspondence; wherein,
the aviation plug is connected with the corresponding first measuring resistor and is used for connecting the intelligent instrument;
the HART modem is respectively connected with the plurality of first measuring resistors and the ARM microprocessor and is used for transmitting uplink and downlink frequency shift keying FSK signals between the intelligent instrument and the aviation plug through the first measuring resistors;
the ARM microprocessor is respectively connected with the HART modem, the FLASH chip, the network port and the power interface, and is used for transmitting a HART request command and a HART response command with the HART modem and sending the acquired intelligent instrument data to the FLASH chip and the network port;
the FLASH chip is used for storing the acquired intelligent instrument data;
the network port is used for connecting a computer and transmitting interaction information between the ARM microprocessor and the computer;
and the power interface is used for connecting an external power supply and supplying power to the ARM microprocessor and the intelligent instrument.
2. The multi-smart meter data collection device of claim 1, further comprising: a plurality of second measuring resistors are arranged and correspond to the aviation plug and the first measuring resistor one by one; wherein,
the second measuring resistor is respectively connected with the corresponding aviation plug and the first measuring resistor;
the digital-to-analog converter is connected with the second measuring resistors and the ARM microprocessor and is used for sending the voltage value information of the two ends of the second measuring resistors to the ARM microprocessor.
3. The multi-smart meter data collection device of claim 1, further comprising: and the digital-to-analog converter is respectively connected with the plurality of first measuring resistors and the ARM microprocessor and is used for sending the voltage value information at two ends of the plurality of first measuring resistors to the ARM microprocessor.
4. The multi-smart meter data collection device of claim 1, further comprising: and the voltage transformation device is respectively connected with the power interface and the ARM microprocessor.
5. The multi-smart meter data collection device of claim 1, further comprising: and the clock chip is connected with the ARM microprocessor.
6. The multi-smart meter data collection device of claim 1, further comprising: and the LED indicator light is connected with the ARM microprocessor.
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| CN201320506003.3U CN203376394U (en) | 2013-08-19 | 2013-08-19 | Data acquisition device of multiple intelligent instruments based on HART protocol |
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| CN201320506003.3U CN203376394U (en) | 2013-08-19 | 2013-08-19 | Data acquisition device of multiple intelligent instruments based on HART protocol |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103697930A (en) * | 2014-01-06 | 2014-04-02 | 上海工业自动化仪表研究院 | Intelligent detection device and detection method for HART instrument aging test |
| CN105587651A (en) * | 2015-12-30 | 2016-05-18 | 天津迈帝特智控科技有限公司 | General scheme for intelligent monitoring terminal for oil pump |
-
2013
- 2013-08-19 CN CN201320506003.3U patent/CN203376394U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103697930A (en) * | 2014-01-06 | 2014-04-02 | 上海工业自动化仪表研究院 | Intelligent detection device and detection method for HART instrument aging test |
| CN105587651A (en) * | 2015-12-30 | 2016-05-18 | 天津迈帝特智控科技有限公司 | General scheme for intelligent monitoring terminal for oil pump |
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Granted publication date: 20140101 |