CN201429474Y - Temperature transmitter based on PROFIBUS-PA bus communication protocol - Google Patents
Temperature transmitter based on PROFIBUS-PA bus communication protocol Download PDFInfo
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- CN201429474Y CN201429474Y CN2009201863686U CN200920186368U CN201429474Y CN 201429474 Y CN201429474 Y CN 201429474Y CN 2009201863686 U CN2009201863686 U CN 2009201863686U CN 200920186368 U CN200920186368 U CN 200920186368U CN 201429474 Y CN201429474 Y CN 201429474Y
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- profibus
- bus
- bus communication
- temperature
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Abstract
The utility model provides a temperature transmitter based on PROFIBUS-PA bus communication protocol, which is characterized in a temperature measuring portion, wherein an LM 285 can provide referencevoltage of 1.235VDC for an AD 7787, an ATMEGA 168 can control a universal signal input channel after a temperature sensor is selected, and provides the appropriate magnification times for a signal filter amplifier, the signal filter amplifier can transmit signals of the temperature sensor to a 24-bit AD converter AD 7787 after filtering and amplifying, the ATMEGA 168 reads the converted data of the AD 7787, carries out the linear processing, and transmits the data to a PROFIBUS-PA bus communication module after changing the data into the actual temperature value through the cold end compensation if the temperature sensor is located on a thermocouple, and the actual temperature value is transmitted to a PROFIBUS-PA bus by the PROFIBUS-PA bus communication module.
Description
Technical field
The utility model relates to a kind of temperature data acquisition and transmission system of industrial automation control, particularly a kind of temperature transmitter based on the PROFIBUS-PA bus communication protocol.
Background technology
Transmitter is a kind of equipment that physical measurement signal or normal signal are converted to the output of standard electric signal or can export in the communications protocol mode, generally be divided into: the temperature/humidity transmitter, pressure unit, differential pressure transmitter, fluid level transmitter, current transducers etc., present temperature transmitter generally are made up of temperature probe (thermoelectricity is thermal resistance sensor occasionally) and two-wire system solid electronic unit.Adopt the solid modules form that temperature probe is directly installed in the terminal box, thereby form incorporate transmitter.
The user gathers information needed and cooperates microsystem or the use of other conventional instruments, transmitter must be placed in a collection point, and considers the comprehensive laying of power lead and data line, and the installation cost or the operation maintenance cost of this engineering are higher.
Summary of the invention
The purpose of this utility model is that by a kind of temperature transmitter based on the PROFIBUS-PA bus communication protocol is provided, it can be placed in anywhere and need not to lay power lead and data line, and low in energy consumption, anti-interference is high.
For solving the problems of the technologies described above, the utility model comprises based on the temperature transmitter of PROFIBUS-PA bus communication protocol: PROFIBUS-PA bus, FBC0409PROFIBUS-PA protocol conversion interface chip, AT91 series microprocessor, bus power taking Voltage stabilizing module, button and LCD demonstration, CY62146 static memory, 24AA256EEPROM, communication isolation, isolated from power, thermometric instrument card, microprocessor, AD converter, voltage reference device, signal filtering amplification, temperature sensor and omnipotent signal input channel are selected.
PROFIBUS-PA bus communication module part: bus power taking Voltage stabilizing module carries out voltage stabilizing with the PROFIBUS-PA bus voltage and powers for each device on this module at 3.3V DC; FBC0409 links to each other with AT91 type CPU, with the modulation and demodulation of PROFIBUS-PA signal; Button links to each other with AT91 type CPU with the LCD display part, realizes the setting and the reality of parameter; The CY62146 static memory links to each other with AT91 type CPU, for the modular program operation provides internal memory; 24AA256EEPROM passes through I
2The C bus links to each other with AT91 type CPU, memory device address, instrument linear parameter etc.; The isolated from power part is isolated the back with the 3.3V DC DC voltage of this module and is partly powered to instrument measurement; The instrument measurement part links to each other with AT91 type CPU by serial ports.
The temperature survey part: the AD7787 converter links to each other with the ATMEGA168 processor by spi bus, LM285 links to each other with AD7787, omnipotent signal input channel is selected to link to each other with the signal filtering amplifier, temperature sensor links to each other with the signal filtering amplifier, cold junction temperature sensor PT100 links to each other with AD7787, and the signal filtering amplifier links to each other with AD7787.
Its principle of work is: PROFIBUS-PA bus communication module part: bus power taking Voltage stabilizing module carries out voltage stabilizing with the PROFIBUS-PA bus voltage and powers for each device on this module at 3.3V DC; FBC0409 carries out demodulation with the command signal on the PROFIBUS-PA bus and delivers to AT91 type CPU, if command signal is for reading the instrument measurement value, then AT91 type CPU partly sends the measured value of reading order of instrument measurement value and the passback of receiving instrument measure portion to instrument measurement, AT91 will carry out demodulation by FBC0409 from the measured value that instrument measurement partly receives again and send on the PROFIBUS-PA bus then, will receive measured value simultaneously by the LCD liquid crystal display; If command signal is the write parameters value, then AT91 will pass through I from the parameter that will write that bus receives
2The C bus is written among the 24AA256 and to bus and sends a little successful confirmation signals.The user can by button and LCD liquid crystal to address setting, the functional block of this module select, parameters such as liquid crystal display scaling position and measured value unit are checked and revise.
Temperature survey part: LM285 provides the reference voltage of 1.235VDC to AD7787, after temperature sensor is selected, ATMEGA168 controls omnipotent signal input channel, offer the suitable enlargement factor of signal filtering amplifier, the signal filtering amplifier carries out temperature sensor signal to pass to 24 bit A/D converter AD7787 after filtering and the amplification, ATMEGA168 reads the AD7787 data converted and carries out linearization process, if temperature sensor position thermopair, after becoming actual temperature value behind the cold junction compensation, send the PROFIBUS-PA bus communication module to again, send the PROFIBUS-PA bus to by the PROFIBUS-PA bus communication module again and get on.
Owing to adopt above technical scheme, the utlity model has following good effect: adopt modular design, the mutual co-ordination of each module; Especially temperature survey part adopts omnipotent input mode, and a PROFIBUS-PA bus temperature transmitter can be selected different temperature sensors, brings great convenience for on-the-spot the use; Adopt 24 bit A/D converters, use least square method algorithm, and carried out cold junction compensation, thereby realized the high-precision temperature measurement at thermocouple sensor up to 6 these sides.
Description of drawings
Below in conjunction with accompanying drawing and preferred implementation the utility model is described in further detail.
Fig. 1 is the circuit block diagram of the utility model based on the preferred implementation of the temperature transmitter of PROFIBUS-PA bus communication protocol.
Number consecutively is that PROFIBUS-PA bus-1, FBC0409PROFIBUS-PA protocol conversion interface chip-2, AT91 series microprocessor-3, bus power taking Voltage stabilizing module-4, button and LCD demonstration-5, CY62146 static memory-6,24AA256EEPROM-7, communication isolation-8, isolated from power-9, thermometric instrument card-10, microprocessor-11, AD converter-12, voltage reference device-13, signal filtering amplification 14, temperature sensor 15 and omnipotent signal input channel select 16 among Fig. 1
Embodiment
Below in conjunction with accompanying drawing specific embodiment of the utility model is illustrated: with reference to shown in Figure 1, the utility model comprises based on the temperature transmitter of PROFIBUS-PA bus communication protocol: PROFIBUS-PA bus 1, FBC0409PROFIBUS-PA protocol conversion interface chip 2, AT91 series microprocessor 3, bus power taking Voltage stabilizing module 4, button and LCD show 5, CY62146 static memory 6,24AA256EEPROM7, communication isolates 8, isolated from power 9, manometer card 10, microprocessor 11, converter 12, voltage reference device 13, signal filtering amplifies 14, temperature sensor 15 and omnipotent signal input channel select 16.
PROFIBUS-PA bus 1 communication module part: bus power taking Voltage stabilizing module 4 carries out voltage stabilizing with the voltage of PROFIBUS-PA bus 1 and gives each device power supply on this module at 3.3V DC; FBC0409 PROFIBUS-PA protocol conversion interface chip 2 links to each other with AT91 type series microprocessor 3 (CPU), with the signal modulation and demodulation on the PROFIBUS-PA bus 1; Button shows that with LCD 5 parts link to each other with AT91 type series microprocessor 3 (CPU), realizes the setting and the reality of parameter; CY62146 static memory 6 links to each other with AT91 type series microprocessor 3 (CPU), for the modular program operation provides internal memory; The CY62146 static memory.
The temperature survey part: AD7787 converter 12 links to each other with ATMEGA168 processor 11 by spi bus, LM285 links to each other with AD7787, omnipotent signal input channel selects 16 to link to each other with signal filtering amplifier 14, temperature sensor 15 links to each other with signal filtering amplifier 14, cold junction temperature sensor PT100 links to each other with AD7787, and signal filtering amplifier 14 links to each other with AD7787.
Below the preferred embodiment of innovation and creation is specified, but the invention is not for fear of described embodiment, those of ordinary skill in the art can also make all modification that is equal to and replacement under the prerequisite of spirit of the present invention, modification that these are equal to or replacement army are included in the application's claim institute restricted portion.
Claims (3)
1. temperature transmitter based on the PROFIBUS-PA bus communication protocol especially comprises:
One AD7787 converter is connected with the ATMEGA168 processor circuit by spi bus;
One omnipotent signal input channel is selected to be connected with the signal filtering amplifier circuit;
One temperature sensor is connected with the signal filtering amplifier circuit.
2. the temperature transmitter based on the PROFIBUS-PA bus communication protocol as claimed in claim 1 is characterized in that: cold junction temperature sensor PT100 is connected with the AD7787 circuit.
3. the temperature transmitter based on the PROFIBUS-PA bus communication protocol as claimed in claim 1 is characterized in that: the signal filtering amplifier is connected with the AD7787 circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201863686U CN201429474Y (en) | 2009-07-15 | 2009-07-15 | Temperature transmitter based on PROFIBUS-PA bus communication protocol |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201863686U CN201429474Y (en) | 2009-07-15 | 2009-07-15 | Temperature transmitter based on PROFIBUS-PA bus communication protocol |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201429474Y true CN201429474Y (en) | 2010-03-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201863686U Expired - Lifetime CN201429474Y (en) | 2009-07-15 | 2009-07-15 | Temperature transmitter based on PROFIBUS-PA bus communication protocol |
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| CN (1) | CN201429474Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103067239A (en) * | 2012-12-30 | 2013-04-24 | 重庆川仪自动化股份有限公司 | Temperature transmitter communication system based on control bus and meter bus (C-MBUS) |
| CN104616477A (en) * | 2015-01-06 | 2015-05-13 | 上海自动化仪表股份有限公司 | Profibus-PA technology-based multi-channel real-time temperature measurement method |
| CN106161653A (en) * | 2016-08-30 | 2016-11-23 | 北京华控技术有限责任公司 | A kind of two-wire system transducer system and communication means thereof |
-
2009
- 2009-07-15 CN CN2009201863686U patent/CN201429474Y/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103067239A (en) * | 2012-12-30 | 2013-04-24 | 重庆川仪自动化股份有限公司 | Temperature transmitter communication system based on control bus and meter bus (C-MBUS) |
| CN104616477A (en) * | 2015-01-06 | 2015-05-13 | 上海自动化仪表股份有限公司 | Profibus-PA technology-based multi-channel real-time temperature measurement method |
| CN106161653A (en) * | 2016-08-30 | 2016-11-23 | 北京华控技术有限责任公司 | A kind of two-wire system transducer system and communication means thereof |
| CN106161653B (en) * | 2016-08-30 | 2022-11-15 | 北京华控技术有限责任公司 | Two-wire transmitter system and communication method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20170727 Address after: 230088 B6-4 layer comprehensive office, No. 168, camphora Road, hi tech Zone, Anhui, Hefei Patentee after: Hefei Anhui Intelligent Technology Co., Ltd. Address before: 230088 light mechanical and electrical integration Garden No. 106, science Avenue five, hi tech Zone, Anhui, Hefei Province, F9A Patentee before: Anhui Wnk Electronic Engineering Co., Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20100324 |