CN102736549A - 24-Bit acquisition module - Google Patents
24-Bit acquisition module Download PDFInfo
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- CN102736549A CN102736549A CN2012101700187A CN201210170018A CN102736549A CN 102736549 A CN102736549 A CN 102736549A CN 2012101700187 A CN2012101700187 A CN 2012101700187A CN 201210170018 A CN201210170018 A CN 201210170018A CN 102736549 A CN102736549 A CN 102736549A
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Abstract
The invention discloses a 24-bit acquisition module composed of a data acquisition processing system and a data communication system, wherein the data acquisition processing system is composed of a voltage/current sensor signal acquisition module, a current-voltage conversion circuit, a filter circuit, a 24-bit analogue-to-digital (AD) conversion chip AD7787 and an AD conversion voltage reference module; the voltage/current sensor signal acquisition module is orderly connected with the current-voltage conversion circuit and the filter circuit; the filter circuit and the AD conversion voltage reference module both are in signal connection with the 24-bit analogue-to-digital conversion chip AD7787; the data communication system is composed of an RS485 conversion circuit and a microprocessor ATMEGA16; the microprocessor ATMEGA16 is in signal connection with the RS485 conversion circuit; and the 24-bit analogue-to-digital conversion chip AD7787 is in signal connection with the microprocessor ATMEGA16 trough an SPI (Serial Peripheral Interface) port. The 24-bit acquisition module is high in acquisition accuracy and suitable for high-requirement systems; the 24-bit acquisition module is special for siemens PLC (Programmable Logic Controller) analogue-to-digital conversion; and the equipment cost is greatly reduced.
Description
Technical field
The present invention relates to a kind of data acquisition system (DAS), relate in particular to a kind of for the data communication that is suitable for PLC and 24 acquisition modules that high-accuracy data acquisition requires.
Background technology
PLC: programmable logic controller (PLC) (Programmable Logic Controller; PLC); It adopts one type of programmable memory; Be used for its internally stored program, actuating logic computing, sequential control, regularly, user oriented instructions such as counting and arithmetical operation, and control various types of machineries or production run through numeral or analog I/O.The AD conversion: the AD conversion is exactly an analog to digital conversion, becomes digital signal to analog signal conversion.The Modbus agreement: the Modbus agreement is a kind of general purpose language that is applied on the electronic controller; When at a Modbus network communication; This agreement has determined each controller need know their device address, the message that identification is sent by the address, and which kind of action decision will produce.
Development along with industrial automation; The application of PLC more and more widely needs frequent treatment of simulated amount, also requires more and more accurate to the acquisition precision of analog quantity; Mostly present existing capture card is 10 or 12; Part can reach 16, has satisfied not more high-precision collection, the shortcoming of current data acquisition module:
A: acquisition precision is low, and the existing analog-to-digital conversion module of Siemens is 12, has satisfied not high-precision requirement;
B: existing acquisition module is not suitable for Siemens PLC C data acquisition and communication.
The objective of the invention is to adopt 24 AD conversion chips, carry out exchanges data through Modbus agreement and Siemens PLC C to the high-precision requirement of Siemens PLC C S7-200 data acquisition.
Summary of the invention
To the deficiency that prior art exists, technical matters to be solved by this invention is, a kind of high-precision, 24 acquisition modules effectively reducing cost that are specifically designed to Siemens PLC C communicating requirement are provided.
For solving the problems of the technologies described above, the technical scheme that the present invention taked is: a kind of 24 acquisition modules, form by data acquisition processing system and data communication system,
Said data acquisition processing system is made up of voltage-current sensor signal acquisition module, current-voltage conversion circuit, filtering circuit, 24 modulus conversion chip AD7787, AD changing voltage base modules; Said voltage-current sensor signal acquisition module is connected with current-voltage conversion circuit and filtering circuit signal successively, and said filtering circuit and AD changing voltage benchmark all are connected with 24 figure place mould conversion chip AD7787 signals;
Said data communication system by the RS485 change-over circuit with and microprocessor ATMEGA16 form, said microprocessor ATMEGA16 is connected with RS485 change-over circuit signal;
Said 24 figure place mould conversion chip AD7787 are connected with microprocessor ATMEGA16 signal through the SPI port.
24 above-mentioned acquisition modules, said RS485 change-over circuit is electrically connected with Siemens PLC C.
The advantage of 24 acquisition modules of the present invention is: have versatility in order to make data acquisition module; Both can gather current signal; Also can gather voltage signal, through current-voltage conversion circuit, convert current signal to voltage signal; Then voltage signal is adjusted to the scope that AD can change, all acquisition modules are provided with three terminals.24 ∑-Δ analog to digital converter AD7787; It utilizes the work of sheet internal clock; So the clock source need be provided, and the data output rate of AD7787 can pass through software setting, needing be suitable for the instrument and equipment of high resolving power, low-power consumption; Acquisition precision of the present invention is high, goes for the high request system; Be specifically designed to analog to digital conversion, greatly reduce equipment cost for Siemens PLC C.
Description of drawings
Fig. 1 is the structured flowchart of data acquisition processing system among the present invention;
Fig. 2 is the structured flowchart of data communication system among the present invention;
Fig. 3 is an one-piece construction block diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is explained further details;
Like Fig. 1,2, shown in 3, a kind of 24 acquisition modules are made up of data acquisition processing system and data communication system,
Data acquisition processing system is made up of voltage-current sensor signal acquisition module, current-voltage conversion circuit, filtering circuit, 24 modulus conversion chip AD7787, AD changing voltage base modules; Said voltage-current sensor signal acquisition module is connected with current-voltage conversion circuit and filtering circuit signal successively, and said filtering circuit and AD changing voltage benchmark all are connected with 24 figure place mould conversion chip AD7787 signals; Data communication system by the RS485 change-over circuit with and microprocessor ATMEGA16 form, said microprocessor ATMEGA16 is connected with RS485 change-over circuit signal; 24 figure place mould conversion chip AD7787 are connected with microprocessor ATMEGA16 signal through the SPI port, and the RS485 change-over circuit is electrically connected with Siemens PLC C.
Principle of work of the present invention is: sensor output signal is generally standard signal 1～5V or 4～20mA, has versatility in order to make data acquisition module, both can gather current signal; Also can gather voltage signal, through current-voltage conversion circuit, convert current signal to voltage signal; Then voltage signal is adjusted to the scope that AD can change; All acquisition modules are provided with three terminals, correspond respectively to the different method that connects of curtage, make acquisition module have versatility.The low-power consumption that is applicable to low frequency measurement, low noise, binary channels, 24 ∑-Δ analog to digital converter AD7787 that modulus conversion chip selects for use ADI company to release; It utilizes the work of sheet internal clock; So the clock source need be provided; And the data output rate of AD7787 can pass through software setting, needing to be suitable for the instrument and equipment of high resolving power, low-power consumption.AD7787 has register in 5 sheets, all is to realize through register to setting and the control of AD7787.The analog to digital conversion reference voltage can provide reliable and stable reference voltage by the ADR395 that ADI company releases.The AD7787 transformation result is communicated by letter with microprocessor ATMEGA16 through the SPI mouth.The AD data converted is through microprocessor ATMEGA16 and plc communication.That communication protocol adopts is Modbus.The Modbus agreement is a kind of general-purpose industrial standard; In Industry Control, obtained widespread use; What the Modbus agreement adopted is a kind of principal and subordinate's agreement; Adopt request-response mode, main website sends the request message that has tributary address, sends response message after the slave station with this address is received and replys.Notebook data communication system PLC is a main website, and data acquisition system (DAS) is a slave station, and when PLC sent request, data acquisition system (DAS) was carried out CRC check earlier, prevents maloperation, after verification is correct, with sending the PLC of main website to after check information and the image data packing.Wherein the plc communication mouth is compatible with RS485, so ATMEGA16 output signal should pass through level conversion, with the main website plc communication.
Certainly, above-mentioned explanation is not to be limitation of the present invention, and the present invention also is not limited to above-mentioned giving an example; Those skilled in the art; In essential scope of the present invention, the variation of making, remodeling, interpolation or replacement all should belong to protection scope of the present invention.
Claims (2)
1. 24 acquisition modules is characterized in that: form by data acquisition processing system and data communication system,
Said data acquisition processing system is made up of voltage-current sensor signal acquisition module, current-voltage conversion circuit, filtering circuit, 24 modulus conversion chip AD7787, AD changing voltage base modules; Said voltage-current sensor signal acquisition module is connected with current-voltage conversion circuit and filtering circuit signal successively, and said filtering circuit and AD changing voltage benchmark all are connected with 24 figure place mould conversion chip AD7787 signals;
Said data communication system by the RS485 change-over circuit with and microprocessor ATMEGA16 form, said microprocessor ATMEGA16 is connected with RS485 change-over circuit signal;
Said 24 figure place mould conversion chip AD7787 are connected with microprocessor ATMEGA16 signal through the SPI port.
2. 24 acquisition modules according to claim 1 is characterized in that: said RS485 change-over circuit is electrically connected with Siemens PLC C.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101700187A CN102736549A (en) | 2012-05-25 | 2012-05-25 | 24-Bit acquisition module |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101700187A CN102736549A (en) | 2012-05-25 | 2012-05-25 | 24-Bit acquisition module |
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| CN102736549A true CN102736549A (en) | 2012-10-17 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107918325A (en) * | 2017-12-05 | 2018-04-17 | 中国电子信息产业集团有限公司第六研究所 | Multi-channel analog acquisition card |
| CN109324562A (en) * | 2018-09-10 | 2019-02-12 | 宁波和利时智能科技有限公司 | To the filter processing method and device of voltage, electric current |
| CN112666853A (en) * | 2019-10-16 | 2021-04-16 | 中电智能科技有限公司 | Domestic CPU-based redundant analog output board card with recovery diagnosis function |
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| US7136433B2 (en) * | 2001-08-28 | 2006-11-14 | Renesas Technology Corp. | Frequency offset cancellation circuit for data determination in FM wireless communications |
| CN201141891Y (en) * | 2008-01-03 | 2008-10-29 | 浪潮电子信息产业股份有限公司 | Power consumption collection module |
| CN201540373U (en) * | 2009-10-22 | 2010-08-04 | 西安石油大学 | 24 bit dual-channel synchronous data collector |
| CN102157981A (en) * | 2011-02-28 | 2011-08-17 | 清华大学 | High-speed data acquisition and digital signal processing device |
| CN102201014A (en) * | 2011-05-24 | 2011-09-28 | 清华大学 | Multi-channel data collection unit |
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2012
- 2012-05-25 CN CN2012101700187A patent/CN102736549A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7136433B2 (en) * | 2001-08-28 | 2006-11-14 | Renesas Technology Corp. | Frequency offset cancellation circuit for data determination in FM wireless communications |
| CN201141891Y (en) * | 2008-01-03 | 2008-10-29 | 浪潮电子信息产业股份有限公司 | Power consumption collection module |
| CN201540373U (en) * | 2009-10-22 | 2010-08-04 | 西安石油大学 | 24 bit dual-channel synchronous data collector |
| CN102157981A (en) * | 2011-02-28 | 2011-08-17 | 清华大学 | High-speed data acquisition and digital signal processing device |
| CN102201014A (en) * | 2011-05-24 | 2011-09-28 | 清华大学 | Multi-channel data collection unit |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107918325A (en) * | 2017-12-05 | 2018-04-17 | 中国电子信息产业集团有限公司第六研究所 | Multi-channel analog acquisition card |
| CN109324562A (en) * | 2018-09-10 | 2019-02-12 | 宁波和利时智能科技有限公司 | To the filter processing method and device of voltage, electric current |
| CN112666853A (en) * | 2019-10-16 | 2021-04-16 | 中电智能科技有限公司 | Domestic CPU-based redundant analog output board card with recovery diagnosis function |
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Application publication date: 20121017 |