CN110989455A - Multifunctional temperature signal conversion device based on ARM platform - Google Patents
Multifunctional temperature signal conversion device based on ARM platform Download PDFInfo
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- CN110989455A CN110989455A CN201911328321.3A CN201911328321A CN110989455A CN 110989455 A CN110989455 A CN 110989455A CN 201911328321 A CN201911328321 A CN 201911328321A CN 110989455 A CN110989455 A CN 110989455A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/02—Means for indicating or recording specially adapted for thermometers
- G01K1/028—Means for indicating or recording specially adapted for thermometers arrangements for numerical indication
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/24—Pc safety
- G05B2219/24215—Scada supervisory control and data acquisition
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Abstract
The invention discloses a multifunctional temperature signal conversion device based on an ARM platform, which comprises a power supply module, a CPU module, a signal input module, a signal output module, a man-machine conversation module, a communication module and a bus board, wherein the power supply module is connected with the CPU module; the power supply module supplies power to each module; the CPU module is used for processing the conversion of the analog quantity signal, judging whether the signal is correct or not, and giving out a corresponding alarm signal, driving a human-computer interface, driving a communication module and setting parameters; the signal input module inputs an analog quantity temperature signal into the CPU module after passing an external temperature signal through the analog-to-digital conversion circuit; the signal output module obtains the temperature signal converted from the CPU module and supplies the temperature signal to an external temperature measuring loop for use; the man-machine conversation module is used for displaying the real-time data of each channel and setting device parameters; the communication module is used for completing communication with an external computer monitoring system. The conversion device can realize the conversion among multiple paths of signals of different types, and is convenient for timely processing faults.
Description
Technical Field
The invention relates to a temperature signal conversion device, in particular to a multifunctional temperature signal conversion device based on an ARM platform.
Background
At present, a temperature measuring system of a transformer substation is mostly formed by adopting a pressure type thermometer with a remote signal and a related signal conversion device thereof. In field application, the condition that the temperature remote transmission signal of the transformer is inaccurate is often caused by the reasons of thermometer remote transmission output module failure, signal conversion device failure, secondary wiring error and the like. The troubleshooting work of the faults is complicated and difficult, and the faults are mainly shown in the following aspects:
1) involving more professions and requiring cross-specialty cooperation for investigation
The remote temperature measuring loop of the transformer relates to primary and secondary professions, so that coordination of a plurality of units and departments such as primary professional maintainers, secondary professional maintainers, transformer thermometer suppliers, substation automation suppliers and the like is needed during troubleshooting;
2) the standardization degree of the temperature measuring equipment is low
Because different transformer manufacturers adopt a plurality of types of temperature measuring instruments, temperature sensors and signal conversion devices, and the principles and wiring modes are different, spare parts are difficult to reasonably purchase;
3) the standardization degree of the temperature measuring loop is lower
Because the specifications of the temperature measuring instrument, the sensor and the signal transmitter are diversified, the existing transformer remote temperature measuring secondary loops are different, and difficulty is caused in fault location and troubleshooting;
4) old equipment
At present, a plurality of transformers, temperature measuring devices of the transformers and accessories matched with the transformers are operated for more than 10 years, a plurality of temperature transmitters and signal converters are shut down, and spare parts of the same type cannot be found for replacement.
The existing transformer temperature measuring system mainly comprises a pressure type thermometer, a temperature sensor (which can be independently installed or integrated in the pressure type thermometer), a temperature signal converter and other accessory accessories. The currently operated transformer temperature measuring system has over ten brands which are imported and manufactured in China. The standardization degree of the products is low, the working principle, the temperature measurement secondary circuit and the like of the products of various manufacturers are different, so that great difficulty is brought to field installation and troubleshooting, and the products mainly change from the following aspects:
1) diversification of remote transmission signals of the device: common modes include PT100 signals, 4-20mA signals, 0-5V signals, CU50 signals and the like, and also special remote transmission signals customized by some manufacturers;
2) diversification of signal processing modes: the temperature signal output by the temperature sensor can enter the computer monitoring system after being processed. In practical application, the signal processing mode generally needs to be realized by a signal conversion device, and the specification and the type, the installation position and the like of the signal conversion device are also various;
3) the secondary loop is not standard: the direct problem brought by the two points is that the remote transmission loop patterns of the temperature measurement system are different, and the standardization degree is very low;
4) the cost is expensive: many of the existing import signal conversion devices are very expensive and, once damaged, are expensive to replace.
Chinese patent No. CN202230366U discloses a built-in temperature conversion device, which comprises a circuit board for laying components, wherein the circuit board is provided with an isolated power supply module, a temperature measurement module, a single chip, an RS485 communication module and a DA conversion module, and the single chip is respectively connected with the isolated power supply module, the temperature measurement module, the RS485 communication module and the DA conversion module through circuits. The utility model discloses an it is simple and convenient to install, and the security is high, can satisfy the function that the temperature required was gathered to the user multichannel and the external communication of realization. However, this patent can only perform a converter for PT100 input signals, and can only realize the conversion of 1-path signals, and thus has a simple function.
Chinese patent application publication No. CN107860583A discloses a conversion device for an analog temperature measurement and control system and a digital temperature measurement and control system. There is a change-over switch unit which is a 6-gang switch composed of 6 double-pole double-throw switches. The invention provides the conversion device of the analog temperature measurement and control system and the digital temperature measurement and control system, which omits the work of manually disassembling and assembling a plug, conveniently and quickly realizes the conversion of the analog temperature measurement and control system and the digital temperature measurement and control system, avoids the problems of wrong connection and improper connection caused by manually disassembling and assembling the plug, ensures the signal quality and improves the working efficiency. However, this patent proposes a switching control device for switching between analog and digital control, which is a simple electrical switching device and is not a device for converting an analog/digital signal.
Disclosure of Invention
In order to overcome the above drawbacks, the present invention provides a multifunctional temperature signal conversion apparatus based on an ARM platform.
In order to achieve the purpose, the invention adopts the following technical scheme:
a multifunctional temperature signal conversion device based on an ARM platform comprises a power supply module, a CPU module, a signal input module, a signal output module, a man-machine conversation module, a communication module and a bus board, wherein the power supply module supplies power to the CPU module, the signal input module, the signal output module, the man-machine conversation module and the communication module through the bus board;
the CPU module is used for processing the conversion of the analog quantity signal, judging whether the signal is correct or not, giving a corresponding alarm signal, driving a human-computer interface, driving a communication module and setting parameters; the signal input module inputs an analog quantity temperature signal into the CPU module after passing an external temperature signal through the analog-to-digital conversion circuit; the signal output module obtains a temperature signal converted from the CPU module and supplies the temperature signal to an external temperature measuring loop for use; the man-machine conversation module is used for displaying the real-time data of each channel and setting device parameters; the communication module is used for completing communication with an external computer monitoring system.
Preferably, the power module is powered by 24V dc or 220V ac, and converts the input voltage into dc 3V or 5V.
Preferably, the CPU module is an ARM processor.
Preferably, the signal input module includes a resistance value sampling module, a current-mode analog signal sampling module, and a voltage-mode analog signal sampling module.
Preferably, the external temperature signal is PT100, CU50, thermocouple, 4-20mA or 0-5V signal.
Preferably, the man-machine conversation module comprises a dot-matrix LED, a keyboard or a touch LCD.
Preferably, the man-machine conversation module further comprises an alarm unit, the alarm unit adopts 6 LED indicator lamps, and the 6 LED indicator lamps are respectively 'power supply', 'operation', 'communication', 'channel 1', 'channel 2' and 'channel 3'
Preferably, the communication module comprises an RS485 interface, an ethernet interface or a wireless communication interface.
The invention has the following positive beneficial effects:
1. the multifunctional temperature signal conversion device based on the ARM platform adopts the ARM platform, takes an embedded computer platform, a semiconductor technology and a communication technology as a basis, and can realize the conversion among a plurality of paths of signals of different types (such as PT100, CU50, a thermocouple, 4-20mA and 0-5V) by utilizing a selection circuit, namely, the types of input signals of different channels can be set through the selection circuit, and after the signals are converted, the types of output signals are selected through the selection circuit; the screen on the device displays the data of input and output signals of each channel and has the function of configuring parameters, and the data is uploaded to a computer monitoring system by adopting various communication modes such as Ethernet, RS485, wireless communication and the like, so that a maintainer can conveniently check the fault of a secondary loop and timely process the fault, and the device mainly comprises the following components:
1) intelligent conversion of input/output signals: one device can complete the conversion of various input/output temperature signals, and is flexible to use;
2) consistency of secondary loop: the temperature measurement system can be applied to temperature measurement systems with different principles and different input and output types, all conversion is carried out in the signal converter, and the consistency of a remote transmission loop of the temperature measurement system can be ensured to the greatest extent;
3) maintenance is facilitated: the signal conversion devices of various types and different secondary circuits are standardized, and the temperature measurement circuit is convenient to overhaul and maintain.
4) And (3) standardization: the acquisition and remote transmission circuit of the temperature signal can be standardized, so that the overhaul is more convenient and the spare parts are simpler to store;
5) the cost is reduced: the cost of the conversion device is far lower than the price of imported equipment, the cost can be reduced by 30-40%, and the quantity of spare parts purchased and stored can be reduced due to the standardization of the spare parts; in addition, the signal conversion device and the circuit thereof are standardized, which is beneficial to rapidly processing the secondary circuit fault and reducing the maintenance labor cost;
the multifunctional temperature signal conversion device based on the ARM platform is a set of temperature signal conversion device which is high in intelligent degree, strong in universality, high in reliability and friendly in human-computer interface, and can realize standardization of the signal conversion device and standardization of wiring of a temperature measurement loop, simplify maintenance work of the temperature measurement loop and reduce manual maintenance cost.
Drawings
FIG. 1 is a functional block diagram of the multifunctional temperature signal conversion device based on the ARM platform according to the present invention;
FIG. 2 is a hardware functional block diagram of the multifunctional temperature signal conversion device based on the ARM platform according to the present invention;
fig. 3 is a software functional block diagram of the multifunctional temperature signal conversion device based on the ARM platform according to the present invention.
FIG. 4 is a schematic diagram of the hardware design of the embedded system of the multifunctional temperature signal conversion device based on the ARM platform.
Detailed Description
The invention will be further illustrated with reference to some specific examples.
Referring to fig. 1-3, a multifunctional temperature signal conversion device based on an ARM platform comprises a power module, a CPU module, a signal input module, a signal output module, a man-machine conversation module, a communication module and a bus board, wherein the power module supplies power to the CPU module, the signal input module, the signal output module, the man-machine conversation module and the communication module through the bus board, and the CPU module is connected with the signal input module, the signal output module, the man-machine conversation module and the communication module through the bus board;
the CPU module is used for processing the conversion of the analog quantity signal, judging whether the signal is correct or not, giving a corresponding alarm signal, driving a human-computer interface, driving a communication module and setting parameters; the signal input module inputs an analog quantity temperature signal into the CPU module after passing an external temperature signal through the analog-to-digital conversion circuit; the signal output module obtains a temperature signal converted from the CPU module and supplies the temperature signal to an external temperature measuring loop for use; the man-machine conversation module is used for displaying the real-time data of each channel and setting device parameters; the communication module is used for converting the temperature signal into a digital signal to complete communication with an external computer monitoring system.
The power supply module adopts 24V direct current power supply or 220V alternating current power supply, and converts input voltage into direct current of 3V or 5V.
The CPU module is an ARM processor.
The signal input module comprises a resistance value sampling module, a current type analog signal sampling module and a voltage type analog signal sampling module.
The external temperature signal is PT100, CU50, a thermocouple, 4-20mA or 0-5V signal.
The man-machine conversation module comprises a dot-matrix LED and a keyboard or comprises a touch LCD.
The man-machine conversation module also comprises an alarm unit, the alarm unit adopts 6 LED indicating lamps, and the 6 LED indicating lamps are respectively 'power supply', 'operation', 'communication', 'channel 1', 'channel 2' and 'channel 3'
The communication module comprises an RS485 interface, an Ethernet interface or a wireless communication interface.
Example 1
A multifunctional temperature signal conversion device based on an ARM platform comprises a power supply module, a CPU module, a signal input module, a signal output module, a man-machine conversation module, a communication module and a bus board (bottom board);
a power supply module: the power supply module adopts 24V direct current power supply or 220V alternating current power supply, converts input voltage into a 3V or 5V power supply, can also be voltage of other specifications, and transmits the voltage to the CPU module, the signal input module, the signal output module, the man-machine conversation module and the communication module through the bus board, so that power can be conveniently supplied to each module;
a CPU module: and 3V or 5V power supply input from the power supply module is obtained through the bus board, so that the work of the CPU module is supported. The CPU module is connected with the signal input module, the signal output module, the man-machine conversation module and the communication module through the bus board; the module is used as a core unit of the conversion device and is used for processing the conversion of the analog quantity signal, judging whether the signal is correct or not, giving a corresponding alarm signal, driving a human-computer interface, driving a communication module and setting parameters. In this embodiment, the CPU module adopts Corter-A8, see fig. 4, in which the Flash controller reads, writes, stores, deletes, and changes addresses to the Flash memory in the system.
A signal input module: the external temperature signal is connected to the module, after passing through the analog-to-digital conversion circuit, the analog quantity temperature signal is input to the CPU module through the main bottom plate, and the external temperature signal is PT100, CU50, a thermocouple, 4-20mA or 0-5V signal.
A signal output module: and obtaining the converted temperature signals from the CPU module, and outputting the signals to an external loop for use, wherein the output signals are 4-20 mA/0-20 mA and 0-5V/0-10V.
A man-machine conversation module: the method is used for displaying the real-time data of each channel and setting device parameters, and comprises setting parameters of each channel, setting device information and setting passwords. The module adopts a 5-inch touch LCD screen with the resolution of 720 × 480 as a dialogue interface between equipment and an operator, the LCD can display input/output signal real-time data of the device and set parameter functions, and if cost reduction needs to be considered, a scheme of 'dot matrix LED + keyboard' can be adopted to replace the touch LCD. On a man-machine conversation interface, an alarm unit of the system is integrated, the alarm unit adopts 6 LED indicating lamps, the operation and alarm state of the display device are displayed, and the 6 LED indicating lamps are respectively 'power supply', 'operation', 'communication', 'channel 1', 'channel 2' and 'channel 3'; the channel 1, the channel 2 and the channel 3 respectively transmit one path of analog quantity temperature signals. The alarm signals are divided into two types, namely the self fault of the device (including the hardware fault of the device, the program crash fault and the like) and the data alarm of each channel, and the self fault of the device is represented by different flashing conditions of a power supply and an operation indicator light; the fault alarm signal of each channel is represented by different flashing conditions of the channel indicator lamp, and can be inquired on the LCD (for each channel, an upper limit and a lower limit of input and output can be set, and the input/output signal which is lower than the lower limit and exceeds the upper limit can be regarded as channel signal abnormity, and an alarm signal is sent out.
A communication module: the temperature signal can be converted into a digital signal, and the data is uploaded to the computer monitoring system in an RS485, Ethernet or wireless communication mode;
bus board (backplane): and the power supply module is connected with each module and used for supplying power to each module as an information transmission channel between the modules and the power supply module.
The use method of the multifunctional temperature signal conversion device based on the ARM platform comprises the following steps:
(1) power supply access: correctly connecting a power supply to a power supply module;
(2) input signal wiring: the external analog input signal is correctly accessed into a signal input module of the device;
(3) output signal wiring: the analog quantity signal output by the signal output module of the device is correctly accessed into an external secondary loop;
(4) communication loop wiring: the communication module of the device is correctly accessed into an external loop in an RS485, Ethernet or wireless communication mode;
(5) setting parameters: the input/output type, communication protocol, communication parameter, password and the like of each channel are set through the man-machine conversation module;
(6) and (3) data verification: after the device normally operates, checking whether input data and output data are the same as theoretical values or not, and checking whether data of a monitoring background are correct or not; and after the data is correct, the device can be put into normal use.
Finally, the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and other modifications or equivalent substitutions made by the technical solutions of the present invention by those of ordinary skill in the art should be covered within the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solutions of the present invention.
Claims (8)
1. A multifunctional temperature signal conversion device based on an ARM platform is characterized by comprising a power supply module, a CPU module, a signal input module, a signal output module, a man-machine conversation module, a communication module and a bus board, wherein the power supply module supplies power to the CPU module, the signal input module, the signal output module, the man-machine conversation module and the communication module through the bus board;
the CPU module is used for processing the conversion of the analog quantity signal, judging whether the signal is correct or not, giving a corresponding alarm signal, driving a human-computer interface, driving a communication module and setting parameters; the signal input module inputs an analog quantity temperature signal into the CPU module after passing an external temperature signal through the analog-to-digital conversion circuit; the signal output module obtains a temperature signal converted from the CPU module and supplies the temperature signal to an external temperature measuring loop for use; the man-machine conversation module is used for displaying the real-time data of each channel and setting device parameters; the communication module is used for completing communication with an external computer monitoring system.
2. The ARM platform based multifunctional temperature signal conversion device as claimed in claim 1, wherein the power module is powered by 24V DC or 220V AC, and converts the input voltage into DC 3V or 5V.
3. The ARM platform based multifunctional temperature signal conversion device as claimed in claim 1, wherein the CPU module is an ARM processor.
4. The ARM platform based multifunctional temperature signal conversion device as claimed in claim 1, wherein the signal input module comprises a resistance value sampling module, a current mode analog signal sampling module, and a voltage mode analog signal sampling module.
5. The ARM platform based multifunctional temperature signal conversion device as claimed in claim 1, wherein the external temperature signal is PT100, CU50, thermocouple, 4-20mA or 0-5V signal.
6. The ARM platform based multifunctional temperature signal conversion device as claimed in claim 1, wherein the man-machine interaction module comprises a dot-matrix LED, a keyboard, or a touch LCD.
7. The ARM platform based multifunctional temperature signal conversion device as claimed in claim 6, wherein the man-machine conversation module further comprises an alarm unit, the alarm unit adopts 6 LED indicating lamps, and the 6 LED indicating lamps are respectively 'power supply', 'operation', 'communication', 'channel 1', 'channel 2', 'channel 3'.
8. The ARM platform based multifunctional temperature signal conversion device as claimed in claim 1, wherein the communication module comprises an RS485 interface, an Ethernet interface or a wireless communication interface.
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Citations (5)
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| CN101419098A (en) * | 2008-12-09 | 2009-04-29 | 大连工业大学 | Intelligent temperature isolation transmitter |
| CN101893449A (en) * | 2009-05-22 | 2010-11-24 | 鞍山远程自动化工程有限公司 | Multifunctional isolating transmitter device |
| CN203024900U (en) * | 2012-12-26 | 2013-06-26 | 于广沅 | Temperature signal isolation transmitter for thermal resistor |
| CN204007653U (en) * | 2014-07-25 | 2014-12-10 | 深圳圣斯尔电子技术有限公司 | A kind of one enters scene 2 full function temperature isolation transmitter |
| CN209671326U (en) * | 2018-04-24 | 2019-11-22 | 江苏亿都智能特种装备有限公司 | A kind of hydraulic oil container Oil-temperature control system |
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2019
- 2019-12-20 CN CN201911328321.3A patent/CN110989455A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101419098A (en) * | 2008-12-09 | 2009-04-29 | 大连工业大学 | Intelligent temperature isolation transmitter |
| CN101893449A (en) * | 2009-05-22 | 2010-11-24 | 鞍山远程自动化工程有限公司 | Multifunctional isolating transmitter device |
| CN203024900U (en) * | 2012-12-26 | 2013-06-26 | 于广沅 | Temperature signal isolation transmitter for thermal resistor |
| CN204007653U (en) * | 2014-07-25 | 2014-12-10 | 深圳圣斯尔电子技术有限公司 | A kind of one enters scene 2 full function temperature isolation transmitter |
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Application publication date: 20200410 |