CN101369142A - Remote I/O data acquisition system and method based on embedded type platform - Google Patents
Remote I/O data acquisition system and method based on embedded type platform Download PDFInfo
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Abstract
The invention relates to a remote I/O data acquisition system based on an embedded platform as well as a method thereof, adopting a 32-bit embedded ARM microprocessor and a mu-C/OS-II real-time operating system kernel, and disclosing the remote I/O data acquisition system. The system and the method can be widely applied to industries such as power, petroleum, chemical, metallurgy, steel and traffic, and are mainly used for the on-site centralized acquisition and digital conversion of various analog signals such as voltage, current, hot resistance and thermocouple in production processes, the converted data can be directly used for monitoring on-site equipment through a liquid crystal display (LCD), and can also remotely transmit the acquired data to upper systems such as DAS and DCS through an RS485 or an Ethernet communication mode, and the data can be used for monitoring equipment parameters and as a basis for equipment control after being processed uniformly by the upper systems. The invention has the dual-net redundant remote communication function, so as to improve the capacity of resisting disturbance and reliability of communication network.
Description
Technical field
The present invention relates to a kind of embedded data acquisition technology, particularly relate to a kind of remote I/O data acquisition system (DAS) based on embedded platform.
Background technology
In various industries such as electric power, oil, chemical industry, metallurgy, iron and steel, traffic, it is essential that data acquisition is carried out robotization control to system.Data acquisition system (DAS) so that in time provide for information about to operating personnel, realizes the safety of controlled device by continuous acquisition and all system operational parameters relevant with controlled device of processing and equipment state signal etc., stable and economical operation.Just can in time report to the police in case any unusual service condition takes place controlled device, to improve the availability of controlled device.
Fast development along with technology such as robotization, computing machine, electronics, Networks and Communications, networking, intellectuality, digitized dcs have obtained widespread use, and this just requires the accuracy of the every data of control system and reliability are had higher requirement.And at present most of adopt not only processing power is limited based on the single-chip data acquisition system of single task order mechanism, and have system real time, the relatively poor problem of reliability.Therefore, for precision and the reliability that improves its data acquisition, adopt the data acquisition system (DAS) of high precision, high reliability necessary.On the developing direction in future, data acquisition system (DAS) should develop towards hard real time, multiparameter, high precision direction, data storage develops towards high capacity, microminiaturization, portable direction, and tcp data segment is towards many communication modes, remote data transfer direction development.
Summary of the invention
It is limited and have system real time, a relatively poor problem of reliability to The present invention be directed to existing single-chip data acquisition system processing power, a kind of remote I/O data acquisition system (DAS) and method based on embedded platform proposed, can measure multiple electric, thermal parameter (as voltage, electric current, thermopair, thermal resistance etc.) in the production run, measurement data can show with LCD, can adopt simultaneously Modbus/RTU or Modbus/TCP communication protocol by RS485 or Ethernet remote transmission to systems such as upper DAS, DCS.Has the double-network redundant remote communicating function, to improve the antijamming capability and the reliability of communication network.
Technical scheme of the present invention is: a kind of remote I/O data acquisition system (DAS) based on embedded platform comprises microprocessor, A/D conversion interface circuit, power circuit, keyboard, reset circuit, LCD demonstration, RS485 interface circuit, ethernet interface circuit, jtag circuit, I
2C circuit peripherals, analog signals is concentrated on the spot and is gathered in the remote I/O data collector that enters based on embedded platform, be converted to digital signal through the A/D interface circuit and enter microprocessor, output shows real time data by LCD behind the microprocessor processes signal, can upper system be arrived in the image data teletransmission by communication interface RS485 or Ethernet interface simultaneously, power circuit provides special power supply to microprocessor, the assurance microprocessor work is stable, keyboard, reset circuit input to microprocessor instruction work, jtag circuit, I for operation
2The C circuit assists microprocessor to carry out the signal transmission as the peripheral input circuit of microprocessor.
Described microprocessor adopts 64kB in-chip FLASH, 32 ARM embedded chip LPC2132 of 16kB ram in slice.But system for use in carrying software adopts, and source code is open, portable cutting, curable preemptive type real-time multi-task operating system μ C/OS-II.
Described communication interface can select RS485 or Ethernet interface with the communication of host computer machine by wire jumper, and Ethernet interface adopts independent Z NE-100TL intelligent embedded type Ethernet serial ports modular converter.
Analog power and the digital power element separation of isolated from power in the described power circuit.
A kind of remote I/O collecting method based on embedded platform comprises remote I/O data acquisition system (DAS) and real-time multi-task operating system μ C/OS-II based on embedded platform, and collecting method may further comprise the steps:
1) system's principal function is the function that program is at first carried out, and realizes the hardware of system and the initialization of operating system;
2) software design of system is made of operating system and user's application task, user's application task comprises that system monitoring task, A/D data sampling task, reception queue monitor task, data send task, keyboard incoming task, six tasks of LCD demonstration task, wherein the requirement of A/D data sampling task real-time is the highest, and it is minimum that LCD shows that the task real-time requires;
3) each task has different priority, hangs up function or delay function by calling system, starts the task of entering ready attitude with higher priority;
4) by the setting to delay parameter, system just starts reception queue monitor task, the periodic scanning buffer circle every certain timeticks;
When 5) finding that read pointer and write pointer are unequal, the data that newly receive in the buffer circle are deposited among the TEMPBUF, send semaphore SendSem simultaneously, data transmission task receives semaphore, starts operation, finishes the data sending function.
Beneficial effect of the present invention is: the present invention adopts 32 embedded-type ARM microprocessors and μ C/OS-II real time operating system, discloses a kind of remote I/O data acquisition system (DAS).Can be widely used in electric power, oil, chemical industry, metallurgical, iron and steel, industries such as traffic, be mainly used in various analog signalses such as voltage in the production run, electric current, thermal resistance, concentrating on the spot of thermopair gathered and digital conversion, data after the conversion can be directly used in the supervision of equipment on the spot by the LCD LCDs, also can adopt Modbus/RTU or Modbus/TCP communication protocol upper DAS to be arrived in the image data teletransmission by RS485 or ethernet communication mode, systems such as DCS, after doing unified the processing by upper system, be used for the device parameter monitoring and as the foundation of device control.
Description of drawings
Fig. 1 the present invention is based on the remote I/O data acquisition system (DAS) structural representation of embedded platform;
Fig. 2 the present invention is based on the remote I/O data acquisition system (DAS) functional task figure of embedded platform;
Fig. 3 the present invention is based on the remote I/O data acquisition system (DAS) power system circuit figure of embedded platform;
Fig. 4 the present invention is based on the remote I/O data acquisition system (DAS) reset circuit figure of embedded platform;
Fig. 5 the present invention is based on the remote I/O data acquisition system (DAS) LCD display control circuit figure of embedded platform;
Fig. 6 the present invention is based on the remote I/O data acquisition system (DAS) RS485 interface circuit figure of embedded platform;
Fig. 7 the present invention is based on the remote I/O data acquisition system (DAS) signal pre-processing circuit figure of embedded platform;
Fig. 8 the present invention is based on the remote I/O data acquisition system (DAS) signal switching circuit of embedded platform;
Fig. 9 the present invention is based on the remote I/O data acquisition system (DAS) analog to digital conversion circuit of embedded platform;
Figure 10 the present invention is based on the remote I/O data acquisition system (DAS) AD7715 data-switching process flow diagram of embedded platform;
Figure 11 the present invention is based on the remote I/O data acquisition system (DAS) application call driver figure of embedded platform;
Figure 12 the present invention is based on the remote I/O data acquisition system (DAS) band buffer zone of embedded platform and the serial ports of semaphore receives synoptic diagram.
Embodiment
24 road I/O passages are arranged and isolate mutually based on the remote I/O data collector of embedded platform, each road I/O passage can both select to measure various voltages, current signal by button setting, and various thermal resistance, thermopair equitemperature signal parameter.Wherein the voltage signal measurement range is 0-75mV, 1-5V, O-5V etc., and the current signal measurement range is O-10mA and 4-20mA, and the thermal resistance measuring sensor comprises Cu50, Cu100, G53, Pt50, Pt100 etc., and the thermocouple measurement element comprises K, E, S, T etc.
As shown in Figure 1, remote I/O data acquisition system (DAS) based on embedded platform disclosed by the invention, the microprocessor 1 of its hardware platform adopts the 64kB in-chip FLASH, 32 ARM embedded chip LPC2132 of 16kB ram in slice, corresponding outfit power circuit 6, keyboard 4, reset circuit 9, LCD demonstration 8, A/D conversion interface circuit 7, RS485 interface circuit 2, ethernet interface circuit 3, jtag circuit 5, I
2C circuit 10 peripherals.Various analog signalses such as voltage, electric current, thermal resistance, thermopair are concentrated on the spot and are gathered in the remote I/O data collector that enters based on embedded platform in the production run, be converted to digital signal through A/D interface circuit 7 and enter microprocessor 1, output shows 8 real time datas by LCD after microprocessor 1 processing signals, can systems such as upper DAS, DCS be arrived in the image data teletransmission by RS485 interface 2 or Ethernet interface 3 simultaneously, after doing unified the processing by upper system, be used for the device parameter monitoring and as the foundation of device control.Power circuit 6 provides special power supply for microprocessor 1, guarantees that microprocessor work is stable, and keyboard 4, reset circuit 9 input to microprocessor instruction work, jtag circuit 5, I for operation
2C circuit 10 is assisted microprocessor 1 work.
Systemic-function task image as shown in Figure 2, but the system software platform adopts, and source code is open, portable cutting, curable preemptive type real-time multi-task operating system μ C/OS-II, simplified the design of application system, made total system simple for structure, made complicated application program levelization.Software design of whole system is made of operating system and a series of user's application task, and system's principal function is the function that program is at first carried out, and mainly realizes the hardware of system and the initialization of operating system.In order to finish the various functions of system's real-time multi-task, application program of the present invention is according to the importance and the real-time of each task, program is divided into six tasks with different priorities, comprise that system monitoring task, A/D data sampling task, reception queue monitor task, data send task, keyboard incoming task, six tasks of LCD demonstration task dispatching, wherein the requirement of A/D data sampling task real-time is the highest, and it is minimum that LCD shows that the task real-time requires.Each task has different priority, hangs up function or delay function by calling system, can start the task of entering ready attitude with higher priority.In design, by the setting to delay parameter, system just starts reception queue monitor task, the periodic scanning buffer circle every certain timeticks.In case when finding that read pointer and write pointer are unequal, just the data that newly receive in the buffer circle are deposited among the TEMPBUF, send semaphore SendSem simultaneously.Data transmission task receives semaphore, starts operation, finishes the data sending function.
As shown in Figure 3, system power supply is by Switching Power Supply output+24V voltage, through the DC/DC step-down, obtain+5V ,+12V, system-12V voltage is obtained by+12V inversion, and+3.3V is obtained by+5V step-down.The kernel of LPC2132 microcontroller and I/O use same supply voltage, only need single power supply 3.3V power supply.The 5V direct supply is through C28, C29 filtering, then by SPX1117M-3.3 with the power supply voltage stabilizing to 3.3V.LPC2132 has independently analog power pin VDDA, VSSA, and in order to reduce noise and the probability of makeing mistakes, analog power and digital power should be isolated.L2 among the figure is exactly the element (high frequency noise of digital power is isolated) that is used for isolated from power.
System reset circuit figure as shown in Figure 4, because high speed, low-power consumption, the low-voltage of ARM microprocessor chip cause its noise capacity low, all many-sides such as the stability in the ripple of power supply, transient response performance, clock source, Power Supply Monitoring reliability are had higher requirement.The reset circuit of native system has used special microprocessor power monitoring chip MAX708S, has improved the reliability of system.
The LCD of system display control circuit figure as shown in Figure 5, the dot-matrix lcd module of harvester band 128*64 of the present invention can show 32 Chinese characters (16*16), 128 characters (8*8), is convenient to field adjustable and revises parameter.
The RS485 of system interface circuit figure as shown in Figure 6, acquisition system can select RS485 or Ethernet interface with the communication of host computer machine by wire jumper.RS485 has the double-network redundant remote communicating function, to improve the antijamming capability and the reliability of communication network.Embedded ethernet interface makes the application program remote exchanges data become and is easy to.Ethernet interface adopts independent Z NE-100TL intelligent embedded type Ethernet serial ports modular converter, is convenient to the system maintenance upgrading.The ZNE-100TL module has 10/100M self-adaptation Ethernet interface, the high bit rate of serial communication is up to 230.4K bps, have multiple mode of operations such as TCP Server, TCP Client, UDP and Real COM, support maximum four connections, support functions such as domain name access.
Be illustrated in figure 7 as signal pre-processing circuit figure, thermopair (E, S etc.), 0-500mV voltage signal can directly be received the anode INPx and the negative terminal INNx of certain passage of analog multiplexer (MUX); 4-20mA current signal and 1-5V signal need enter the anode INPx and the negative terminal INNx of certain passage of MUX behind resistance conversion; RTD thermal resistance (Pt100, Cu50 etc.) will connect the 1mA constant current source, receives the anode INPx and the negative terminal INNx of certain passage of MUX again.
Be illustrated in figure 8 as signal switching circuit, have two analog multiplexers (MUX) U1, U2 to form.
Be illustrated in figure 9 as the signal analog to digital conversion circuit, adopt 16 ADC chip AD7715, chip is connected with system simply, only needs five line CS (sheet choosing), SCLK (clock), DIN (data input), DOUT (data output) and DRDY (data are good).
Be AD7715 data-switching process flow diagram as shown in figure 10, the conversion of application A/D is the important component part of data acquisition system (DAS), and the implementation procedure of A/D driver depends primarily on the inversion frequency, input channel number of switching time, the analogue value of A/D converter etc. under μ C/OS-II The Realtime Operating System Nucleus.Typical A/D change-over circuit is made up of analog multiplexer (MUX), amplifier and analog to digital converter (ADC) three parts.
Be application call driver figure as shown in figure 11.The analog channel (1.) that driver will read by the MUX selection, it is several delicate so that signal is transmitted by MUX to delay time, and makes it to settle out.Then, ADC is triggered and begins conversion (2.).Driver waits for that in a software cycles (3.) ADC is up to finishing conversion then.When circular wait, driver detects the status signal of ADC.If the software timing value that the stand-by period surpass to be set then finishes etc. to be recycled.If in circular wait, when detecting ADC and sending the signal of EOC, driver reads result's (4.) of ADC conversion and the result is turned back to application program (5.).
Serial ports for band buffer zone and semaphore receives synoptic diagram as shown in figure 12.Because serial device exists peripheral hardware processing speed and the unmatched problem of CPU speed, so need a buffer zone.When serial ports sends data,, take out outward one by one by serial ports then and send out as long as data are write in the buffer zone.When serial ports received data, often waiting just needed CPU to handle after receiving several bytes, so these advance data can be stored in the buffer zone earlier.The asynchronous serial port of LPC2132 chip has 16 bytes and receives and send FIFO.In actual applications, need from internal memory, open up two buffer zones, be respectively send buffer and send buffer zone.Here buffer zone is defined as the data structure of circle queue.The uC/OS-II The Realtime Operating System Nucleus provides semaphore as communication and synchronous mechanism, and introducing data reception signal amount, data send semaphore and respectively the operation at buffer zone two ends carried out synchronously.The operator scheme of serial ports is as follows: user task is wanted to write, but buffer zone sleeps on semaphore when full, allows CPU move other task, treats that ISR is from waking the task of this sleep after buffer zone is read away data up; Equally, user task is wanted to read, but during buffer empty, also can sleep on semaphore, treats that external unit has data to wake up again.Because the semaphore of uCOS-II provides waiting-timeout mechanism, serial ports also has overtime literacy certainly.The data reception signal amount is initialized as 0, is illustrated in no datat in the buffer circle.After receiving the interruption arrival, ISR reads in the byte (2.) of reception from the reception buffer of UART, put into send buffer (3.), wakes the read operation (4., 1.) of user task end then up by the received signal amount.In whole process, can the query note buffer zone in the variate-value of current byte number, this variable shows whether send buffer full.The size of buffer zone should rationally be provided with, and reduces the possibility of loss of data, avoids the waste of storage space again.
Claims (6)
1. remote I/O data acquisition system (DAS) based on embedded platform, comprise microprocessor, A/D conversion interface circuit, it is characterized in that, also comprise power circuit, keyboard, reset circuit, LCD demonstration, RS485 interface circuit, ethernet interface circuit, jtag circuit, I
2C circuit peripherals, analog signals is concentrated on the spot and is gathered in the remote I/O data collector that enters based on embedded platform, be converted to digital signal through the A/D interface circuit and enter microprocessor, output shows real time data by LCD behind the microprocessor processes signal, can upper system be arrived in the image data teletransmission by communication interface RS485 or Ethernet interface simultaneously, power circuit provides power supply to microprocessor, the assurance microprocessor work is stable, keyboard, reset circuit input to microprocessor instruction work, jtag circuit, I for operation
2The C circuit assists microprocessor to carry out the signal transmission as the peripheral input circuit of microprocessor.
2. according to the described remote I/O data acquisition system (DAS) of claim 1, it is characterized in that described microprocessor adopts 64kB in-chip FLASH, 32 ARM embedded chip LPC2132 of 16kB ram in slice based on embedded platform.
3. according to the described remote I/O data acquisition system (DAS) of claim 1 based on embedded platform, it is characterized in that, described communication interface can select RS485 or Ethernet interface with the communication of host computer machine by wire jumper, and Ethernet interface adopts independent Z NE-100TL intelligent embedded type Ethernet serial ports modular converter.
4. according to the described remote I/O data acquisition system (DAS) of claim 1, it is characterized in that analog power and the digital power element separation of isolated from power in the described power circuit based on embedded platform.
5. according to the described remote I/O data acquisition system (DAS) of claim 2 based on embedded platform, it is characterized in that, but described microprocessor system for use in carrying software adopts that source code is open, portable cutting, curable preemptive type real-time multi-task operating system μ C/OS-II.
6. the remote I/O collecting method based on embedded platform comprises remote I/O data acquisition system (DAS) and real-time multi-task operating system μ C/OS-II based on embedded platform, and collecting method may further comprise the steps:
1) system's principal function is the function that program is at first carried out, and realizes the hardware of system and the initialization of operating system;
2) software design of system is made of operating system and user's application task, user's application task comprises that system monitoring task, A/D data sampling task, reception queue monitor task, data send task, keyboard incoming task, six tasks of LCD demonstration task, wherein the requirement of A/D data sampling task real-time is the highest, and it is minimum that LCD shows that the task real-time requires;
3) each task has different priority, hangs up function or delay function by calling system, starts the task of entering ready attitude with higher priority;
4) by the setting to delay parameter, system just starts reception queue monitor task, the periodic scanning buffer circle every certain timeticks;
When 5) finding that read pointer and write pointer are unequal, the data that newly receive in the buffer circle are deposited among the TEMPBUF, send semaphore SendSem simultaneously, data transmission task receives semaphore, starts operation, finishes the data sending function.
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| CN102096381A (en) * | 2010-12-17 | 2011-06-15 | 东莞元创自控科技有限公司 | Low power consumption RTU (remote terminal unit) micro controller |
| CN102611751A (en) * | 2012-03-19 | 2012-07-25 | 株洲科瑞变流电气有限公司 | High-power rectifier equipment on-line monitoring device based on web enterprise builder (WEB) |
| CN101819424B (en) * | 2010-01-25 | 2013-01-16 | 南京埃斯顿自动化股份有限公司 | Method and controller for controlling position, pressure measurement and safe control of sliding block of forging machine tool |
| CN102946338A (en) * | 2012-09-25 | 2013-02-27 | 厦门大学 | 12-channel asynchronous serial data universal centralized collection device |
| CN103206194A (en) * | 2013-04-02 | 2013-07-17 | 中国石油大学(华东) | Offshore oil platform injecting and producing system |
| CN103457928A (en) * | 2013-06-28 | 2013-12-18 | 北京盛世光明软件股份有限公司 | Sensor signal network transmission converter |
| CN103716336A (en) * | 2014-01-23 | 2014-04-09 | 国家电网公司 | Communication system based on electric power dependable computing platform communication security and method |
| CN105301343A (en) * | 2015-09-18 | 2016-02-03 | 成都比善科技开发有限公司 | Power monitoring system of three phase power supply |
| CN106526363A (en) * | 2016-11-01 | 2017-03-22 | 株洲中车时代电气股份有限公司 | Converter power component online monitoring system |
| CN106980536A (en) * | 2017-03-24 | 2017-07-25 | 中南大学 | The program scheduler method of data acquisition monitor |
| CN107291015A (en) * | 2017-07-27 | 2017-10-24 | 太仓华淏信息科技有限公司 | A kind of portable high-accuracy data collecting system |
| CN107505911A (en) * | 2017-10-23 | 2017-12-22 | 盐城工学院 | Data collecting system and power equipment monitoring system |
| CN107608204A (en) * | 2017-09-29 | 2018-01-19 | 上海微程电气设备有限公司 | Redundancy communication controller based on arm processor |
| CN108509277A (en) * | 2018-04-03 | 2018-09-07 | 中国电子科技集团公司第七研究所 | Electronic lock serial ports Asynchronous Reception processing system and method |
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| CN110657842A (en) * | 2019-11-13 | 2020-01-07 | 河北唐银钢铁有限公司 | Motor multi-parameter measurement monitoring system |
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| CN102096381A (en) * | 2010-12-17 | 2011-06-15 | 东莞元创自控科技有限公司 | Low power consumption RTU (remote terminal unit) micro controller |
| CN102611751B (en) * | 2012-03-19 | 2014-09-24 | 株洲科瑞变流电气有限公司 | High-power rectifier equipment on-line monitoring device based on web enterprise builder (WEB) |
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| CN102946338A (en) * | 2012-09-25 | 2013-02-27 | 厦门大学 | 12-channel asynchronous serial data universal centralized collection device |
| CN102946338B (en) * | 2012-09-25 | 2015-02-18 | 厦门大学 | 12-channel asynchronous serial data universal centralized collection device |
| CN103206194A (en) * | 2013-04-02 | 2013-07-17 | 中国石油大学(华东) | Offshore oil platform injecting and producing system |
| CN103457928A (en) * | 2013-06-28 | 2013-12-18 | 北京盛世光明软件股份有限公司 | Sensor signal network transmission converter |
| CN103716336A (en) * | 2014-01-23 | 2014-04-09 | 国家电网公司 | Communication system based on electric power dependable computing platform communication security and method |
| CN105301343A (en) * | 2015-09-18 | 2016-02-03 | 成都比善科技开发有限公司 | Power monitoring system of three phase power supply |
| CN106526363A (en) * | 2016-11-01 | 2017-03-22 | 株洲中车时代电气股份有限公司 | Converter power component online monitoring system |
| CN106980536A (en) * | 2017-03-24 | 2017-07-25 | 中南大学 | The program scheduler method of data acquisition monitor |
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| WO2018184168A1 (en) * | 2017-04-06 | 2018-10-11 | 邹霞 | Built-in remote terminal server |
| CN107291015A (en) * | 2017-07-27 | 2017-10-24 | 太仓华淏信息科技有限公司 | A kind of portable high-accuracy data collecting system |
| CN107608204A (en) * | 2017-09-29 | 2018-01-19 | 上海微程电气设备有限公司 | Redundancy communication controller based on arm processor |
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