CN105509839A - CMC-chip-based electric buoy liquid level transmitter - Google Patents
CMC-chip-based electric buoy liquid level transmitter Download PDFInfo
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- CN105509839A CN105509839A CN201511010839.4A CN201511010839A CN105509839A CN 105509839 A CN105509839 A CN 105509839A CN 201511010839 A CN201511010839 A CN 201511010839A CN 105509839 A CN105509839 A CN 105509839A
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- chip
- cmc
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- liquid level
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
Abstract
The invention provides a CMC-chip-based electric buoy liquid level transmitter, aims to solve the technical problem that an existing electric buoy liquid level transmitter does not have a digital communication function and belongs to the technical field of object position measurement. The CMC-chip-based electric buoy liquid level transmitter comprises a Hall signal sampling circuit, a CMC chip, a human-machine interface, an EPA communication interface and an MODBUS supporting communication interface; the human-machine interface is connected with the CMC chip; the Hall signal sampling circuit is connected with the CMC chip through a signal conditioning circuit and an A/D conversion circuit; liquid level signals processed through the CMC chip are converted into 4-20 mA standard direct current signals by a D/A conversion circuit and output; the CMC chip is connected with a digital output interface; the CMC chip is connected with an RS483 interface and achieves an MODUS communication protocol; the CMC chip is connected with an ethernet interface and achieves an EPA communication protocol. By means of the CMC-chip-based electric buoy liquid level transmitter, extra digital information can be added to the electric buoy liquid level transmitter, and application of the CMC-chip-based electric buoy liquid level transmitter to a modern industrial system is facilitated.
Description
Technical field
The invention belongs to object position measurement technical field, be specifically related to a kind of electric float level transducer based on CMC chip.
Background technology
Electricity float level transducer is the one of level measurement instrument, is widely used in the industries such as electric power, metallurgy, petrochemical industry, light textile, food, medicine.Electricity float level transducer is a kind of floating type liquid level instrument, is made up of floating drum (elongated cylindrical) and torsion tube mechanism.Floating drum to be hung vertically on lever and to be immersed in the liquid in measuring chamber, buoyancy respective change is caused when liquid level changes, the change of torque tube angulation, mandrel and torque tube synchronous rotary, export the angular displacement that the change of buoyancy and liquid level change convert torque tube mandrel to.Drive the magnetic steel component be fixed on reel cage to be subjected to displacement change, change the magnetic field that hall effect sensor detects, Hall element is made corresponding voltage and is exported, and the current signal being converted to standard by electronic circuitry part is exported, and measures liquid-level interface thus.Along with field bus technique is in the application of industrial process control field, original electric float level transducer is controlled by 4-20mA simulating signal, can not carry out digital communication, can not meet the requirement of modern industry system.
EPA real-time ethernet standard, it is the international standard that first, China has the industrial automation of independent intellectual property right, namely EPA is the industrial field device open network platform be based upon on Basic Ethernet, by this platform, industrial field device not only can be made (as field controller, transmitter, topworks etc.) realize based on the communication of Ethernet, and industrial field device layer network can be made not to be free on outside the main flow communication technology, and with main flow communication technology synchronized development, simultaneously, by Ethernet scene equipment level to key-course, " E net on earth " of all levels networks such as administration and supervision authorities, realize the information Seamless integration-of each level of industrial enterprise's complex automatic system, promote technological transformation and the lifting of industrial enterprise, accelerate information reform process.
Modbus agreement is the standard of industrial automation, adopt the communication that a twisted-pair feeder realizes between multiple equipment, Modbus agreement adopts catechetical communication mode, has simply, hardware is cheap, highly versatile, advantage easy to use, easily exploitation and realization.ModbusRTU has almost become the communication protocol of domestic PLC and frequency converter first-selection.Modbus agreement does not need special communication module, and the storehouse needed for communication and protocol realize in a software form, belongs to the 7th layer of ISO-OSI reference model.Its another advantage can be communicated by any transmission medium, comprises twisted-pair feeder, radio communication, light transmitting fiber, Ethernet, telephone modem, mobile phone and microwave etc.Like this can be new or set up Modbus in existing factory and connect at one easily.
Summary of the invention
The object of the invention is: the defect overcoming the nil communication function that existing electric float level transducer exists.Topic, provides a kind of electric float level transducer based on CMC chip, existing electric float level transducer basis adds digital communication functions, makes it the requirement adapting to modern industry system.
For achieving the above object, the technical scheme of Bian is: a kind of electric float level transducer based on CMC chip, it is characterized in that: comprise hall signal sample circuit, CMC chip, man-machine interface, the communication interface of support EPA agreement and the communication interface of support MODBUS agreement, man-machine interface is connected with CMC chip, display state and the instruction of reception outer setting;
Hall signal sample circuit is connected with CMC chip through signal conditioning circuit and A/D change-over circuit, and the liquid level signal collected is sent into CMC chip;
Liquid level signal after the process of CMC chip is converted to 4-20mA standard DC signal output through D/A change-over circuit;
CMC chip is connected with digital output interface;
CMC chip is connected with RS485 interface, realizes MODUS communications protocol;
CMC chip is connected with Ethernet interface, realizes EPA communications protocol.
The above CMC chip adopts system configuration software to carry out logic control program, by the download program write in the on-chip memory of chip, configuration processes, program storage, signal input and output, control algolithm, communication interface are all integrated in a chip by it, to realize logic control in sheet, routine processes and management and running, several data interface communication.
The above CMC chip is CMC540C128 chip.
Beneficial effect of the present invention is: the electric float level transducer that the present invention is based on CMC chip, and original cable arrangements and control strategy can continue to play a role; Secondly, extra numerical information can be increased, be convenient to installation, adjustment, maintenance and control in modern industry system, thus save a large amount of expense, turn improve measuring accuracy and the utilization factor of electric float level transducer simultaneously.
Accompanying drawing explanation
Fig. 1: based on the electrical schematic diagram of the electric float level transducer of CMC chip;
The circuit diagram of the communication interface of Fig. 2: CMC chip and support Modbus agreement;
The schematic diagram of the communication interface of Fig. 3: CMC chip and support EPA agreement.
Embodiment
Illustrate that the invention will be further described with embodiment below by way of accompanying drawing.
The present invention electric signal corresponding to liquid level signal converts to by hall signal sample circuit, thing place value is obtained by the control of CMC chip to A/D change-over circuit, after carrying out data processing and computing, convert corresponding 4-20mA analog output signal to and be sent to master-control room reception.In the control system of R485 connection in Physical layer, float level meter is by supporting that the communication interface of Modbus sends system to the data message that control system needs, simultaneity factor can set the data of float level meter, thus realizes the remote monitoring to electric floating drum; In the control system of the fieldbus of EPA, support that the electric floating drum of EPA agreement can connect and enter EPA control system, the real-time data communication service provided by EPA network communication platform, application program can realize accessing and operation the information transparency of electric floating drum.In the present invention, main variable and control information are transmitted by 4 ~ 20mA, and in case of need, other procedure parameters, device configuration, calibration and configuration info are accessed in the mode of digital communication by EPA agreement and MODBUS agreement.
As shown in Figure 1 based on the electrical schematic diagram of the electric float level transducer of CMC chip, a kind of electric float level transducer based on CMC chip, it is characterized in that: comprise hall signal sample circuit, CMC chip, man-machine interface, the communication interface of support EPA agreement and the communication interface of support MODBUS agreement, man-machine interface is connected with CMC chip, display state and the instruction of reception outer setting;
Hall signal sample circuit is connected with CMC chip through signal conditioning circuit and A/D change-over circuit, and the liquid level signal collected is sent into CMC chip;
Liquid level signal after the process of CMC chip is converted to 4-20mA standard DC signal output through D/A change-over circuit;
CMC chip is connected with digital output interface, realizes DO and exports;
CMC chip is connected with RS485 interface, realizes MODUS communications protocol;
CMC chip is connected with Ethernet interface, realizes EPA communications protocol.
As shown in Figure 2, the schematic diagram of the communication interface of CMC chip and support EPA agreement as shown in Figure 3 for the circuit diagram of the communication interface of CMC chip and support Modbus agreement.
The above CMC chip adopts system configuration software to carry out logic control program, by the download program write in the on-chip memory of chip, configuration processes, program storage, signal input and output, control algolithm, communication interface are all integrated in a chip by it, to realize logic control in sheet, routine processes and management and running, several data interface communication.The configuration software of chip is used to carry out logic control program, by the download program write in the on-chip memory of chip.According to the program of user, process computing is carried out to the various signals (comprising the signal imported into from communication interface) of input, and carries out corresponding signal output.Logic control mainly comprises to write upper-layer user and the logic control program (as ladder diagram, IL, ST etc.) passing through compiling carries out performing process.Integrated chip Flash, SRAM, general purpose timer, PLL, real time clock, and the multiple communication interface such as ethernet mac, UART, CAN, SPI, I2C.
The electric float level transducer that the present invention is based on CMC chip can adopt CMC540C128 chip.CMC chip gathers hall signal, calculates liquid level position by CMC, exports 4-20mA current signal, can arrange warning message, EPA can be supported to communicate and MODBUS communication.
Claims (3)
1. the electric float level transducer based on CMC chip, it is characterized in that: comprise hall signal sample circuit, CMC chip, man-machine interface, the communication interface of support EPA agreement and the communication interface of support Modbus agreement, man-machine interface is connected with CMC chip, display state and the instruction of reception outer setting;
Hall signal sample circuit is connected with CMC chip through signal conditioning circuit and A/D sample circuit, and the liquid level signal collected is sent into CMC chip;
Liquid level signal after the process of CMC chip is converted to 4-20mA standard DC signal output through D/A change-over circuit;
CMC chip is connected with digital output interface;
CMC chip is connected with RS485 interface, realizes Modbus communications protocol;
CMC chip is connected with Ethernet interface, realizes EPA communications protocol.
2. the electric float level transducer based on CMC chip according to claim 1, it is characterized in that: described CMC chip adopts system configuration software to carry out logic control program, by the download program write in the on-chip memory of chip, configuration processes, program storage, signal input and output, control algolithm, communication interface are all integrated in a chip by it, to realize logic control in sheet, routine processes and management and running, several data interface communication.
3. the electric float level transducer based on CMC chip according to claim 1, is characterized in that: described CMC chip is CMC540C128 chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511010839.4A CN105509839A (en) | 2015-12-30 | 2015-12-30 | CMC-chip-based electric buoy liquid level transmitter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511010839.4A CN105509839A (en) | 2015-12-30 | 2015-12-30 | CMC-chip-based electric buoy liquid level transmitter |
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| CN105509839A true CN105509839A (en) | 2016-04-20 |
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| CN201511010839.4A Pending CN105509839A (en) | 2015-12-30 | 2015-12-30 | CMC-chip-based electric buoy liquid level transmitter |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106052803A (en) * | 2016-07-14 | 2016-10-26 | 天津市鑫成仪表有限公司 | Magnetic inductive liquid level monitoring system based on mobile communication network |
| CN106197617A (en) * | 2016-07-14 | 2016-12-07 | 天津市鑫成仪表有限公司 | A kind of magnetic induction level monitoring device based on mobile radio communication |
| CN106225880A (en) * | 2016-07-14 | 2016-12-14 | 天津市鑫成仪表有限公司 | A kind of magnetic induction level monitoring device based on LAN |
| CN106248176A (en) * | 2016-07-14 | 2016-12-21 | 天津市鑫成仪表有限公司 | A kind of magnetic induction level monitoring system based on CAN |
-
2015
- 2015-12-30 CN CN201511010839.4A patent/CN105509839A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106052803A (en) * | 2016-07-14 | 2016-10-26 | 天津市鑫成仪表有限公司 | Magnetic inductive liquid level monitoring system based on mobile communication network |
| CN106197617A (en) * | 2016-07-14 | 2016-12-07 | 天津市鑫成仪表有限公司 | A kind of magnetic induction level monitoring device based on mobile radio communication |
| CN106225880A (en) * | 2016-07-14 | 2016-12-14 | 天津市鑫成仪表有限公司 | A kind of magnetic induction level monitoring device based on LAN |
| CN106248176A (en) * | 2016-07-14 | 2016-12-21 | 天津市鑫成仪表有限公司 | A kind of magnetic induction level monitoring system based on CAN |
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Application publication date: 20160420 |