CN2582057Y - Main circuit board based on field bus for temp/pressure sensor - Google Patents

Main circuit board based on field bus for temp/pressure sensor Download PDF

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Publication number
CN2582057Y
CN2582057Y CN 02261659 CN02261659U CN2582057Y CN 2582057 Y CN2582057 Y CN 2582057Y CN 02261659 CN02261659 CN 02261659 CN 02261659 U CN02261659 U CN 02261659U CN 2582057 Y CN2582057 Y CN 2582057Y
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China
Prior art keywords
module
signal
circuit board
microprocessor
main circuit
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Expired - Fee Related
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CN 02261659
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Chinese (zh)
Inventor
简庆年
孙和平
韩华
金慧
蒋六民
王志樑
杨英
黄鹤
何宇功
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711th Research Institute of CSIC
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711th Research Institute of CSIC
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Priority to CN 02261659 priority Critical patent/CN2582057Y/en
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Abstract

The utility model relates to a main circuit board based on field bus for temperature/pressure sensors, which is characterized in that the utility model comprises a power supply conversion module, a microprocessor, a CAN interface module, a reset circuit module, a signal conditioning module, a first connector and a second connector. The utility model changes traditional output current signal of a temperature/pressure transducer into digital signal and can transfer treated digital signal to a field bus network via the CAN interface. Besides the functions of sensor data acquisition and field bus communication, the utility model also has the functions of automatic of diagnosing, disposing range, damping coefficient and engineering unit and fixing sensor characteristics, etc. The utility model has the advantages of small size, complete function, high reliability and fast data transmission speed.

Description

The main circuit board of Fieldbus Based temperature/pressure sensor
Technical field
The utility model relates to a kind of main circuit board of Fieldbus Based temperature/pressure sensor.
Background technology
Along with industrial development, measuring control point that needs and observing and controlling parameter are more and more, and traditional distributed control system has been difficult to adapt to requirement, the substitute is a kind of emerging Fieldbus Based opening control system.Numerous smart machine or intelligence sensor then are to be positioned at produced on-site manufacturing, operation area, are in opening control system foremost, so the quality of its performance, and the reliability of output information is most important to total system.A kind of Fieldbus Based intelligent temperature/pressure transducer will more and more come into one's own in opening control system.
Summary of the invention
The purpose of this utility model is to provide the main circuit board of the temperature/pressure sensor of a kind of band fieldbus (CAN).This circuit board also has sensor is carried out fault self-diagnosis except having sensor data acquisition and field bus communication function, and range, ratio of damping, engineering unit are set, and revises functions such as sensor characteristic.It is little to have installation dimension, multiple functional, reliability height, the advantage that data rate is fast.
The technical measures that the utility model is taked are: the main circuit board of Fieldbus Based temperature/pressure sensor, be characterized in, comprise: power conversion module, microprocessor, CAN interface module, reset circuit module, signal adjusting module, first connector, second connector; Wherein:
The power conversion module is used for an input 24V supply voltage is become the 5V operating voltage, for each module of main circuit board provides one group of stable operating voltage;
Microprocessor is used for pick-up transducers signal, data processing and computing, and the output result, and its input end is connected with the output terminal of signal adjusting module with the reset circuit module respectively;
The CAN interface module is used for providing differential sending function and to the differential reception of CAN bus to the CAN bus, and finishes all functions of Physical layer and data link layer automatically by standard, and it links to each other with described microprocessor is two-way.
The reset circuit module is used to produce one and respectively described microprocessor and described CAN interface module is carried out initial electrification reset by high step-down and one by the low level signal that uprises, and its output terminal links to each other with the CAN interface module with microprocessor respectively.
Signal adjusting module is used to make the input pickup current signal to be transformed to voltage signal, and carries out signal zero adjustment and filtering.Its output terminal links to each other with described microprocessor.
First connector is used to make the access of working power and sensor signal and be connected with external fieldbus, and it is connected with the field-bus interface module is two-way, and its output terminal links to each other with signal adjusting module with described power conversion module;
Second connector is used for described microprocessor is programmed and debugged, and it links to each other with described microprocessor is two-way.
The main circuit board of above-mentioned Fieldbus Based temperature/pressure sensor, wherein, described main circuit board also comprises the special connection to ground wire, should connect specially and be: earlier the working power ground wire of all microprocessors on the main circuit board and the ground wire of mould/power supply that the number conversion interface is used are connected respectively, and then two kinds of ground wires be linked to each other with lead.
Because the utility model has adopted above technical scheme, it becomes digital signal to the current signal of traditional temperature/pressure sensor output, and by the CAN interface the digital data transmission handled well in fieldbus networks, thereby have high precision and high stability, and have low characteristics such as cost performance.
Description of drawings
Concrete structure of the present utility model is further provided by following embodiment and accompanying drawing thereof.
Fig. 1 is the theory diagram of the utility model main circuit board.
Fig. 2 is the circuit diagram of the utility model main circuit board embodiment.
Embodiment
See also Fig. 1, Fig. 2.A kind of temperature/pressure sensor main circuit board with fieldbus provided by the utility model, selecting a kind of model for use is the SMD chip microprocessor of ADUC812, forms a single-chip microprocessor system by the CAN controller interface circuit.It comprises: power conversion module 1, microprocessor 2, fieldbus (CAN) interface module 3, reset circuit module 4, signal adjusting module 5, first connector 6, second connector 7; Wherein:
Power conversion module 1 is used for an input 24V supply voltage is become the 5V operating voltage, and for each module of the utility model main circuit board provides one group of stable operating voltage, it is that three-terminal voltage-stabilizing pipe and two leaded multilayer ceramic capacitor of 7805 are formed by a slice model.
Microprocessor 2 is used for pick-up transducers signal, data processing and computing, and the output result.It is the chip microprocessor of ADUC812 by a slice model, a crystal oscillator, and a resistance and 7 electric capacity are formed.It links to each other with described power conversion module 1.ADUC812 is 12 fully integrated bit data acquisition systems, includes the interior flash/electricity of 8K chunk and wipes memory under program, data memory in 256 chunks.It becomes digital signal to the sensor signal that is collected, and behind data processing, computing and self diagnosis, the communication format of CAN fieldbus in accordance with regulations sends data to host computer.For improving the precision of the utility model A/D data acquisition, the utility model in actual use, ground wire has been carried out special processing to be connected, that is: the ground wire of the power supply of earlier the working power ground wire of all microprocessors on the main circuit board and mould/number conversion being used is connected respectively, and then continuous two kinds of ground wires with lead.After handling like this, image data precision of the present utility model is improved greatly.
CAN interface module 3, be used for providing differential sending function to the CAN bus, with differential reception to the CAN bus, and finish all functions of Physical layer and data link layer automatically by standard, it is that SJA1000 CAN controller, a slice model are that the CAN control unit interface of 82C250, crystal oscillator and some resistance, electric capacity are formed it and 2 two-way connections of microprocessor by a slice model.
Reset circuit module 4, be used to produce one by high step-down and one by the low level signal that uprises, respectively the SJA1000CAN controller on ADUC812 chip microprocessor on the described microprocessor 2 and the described CAN interface module 3 is carried out initial electrification reset, it is that SMD monostable integrated circuit and some resistance, the electric capacity of 74LS123 is formed by a slice model, and its output terminal links to each other with CAN interface module 3 with microprocessor 2.
Signal adjusting module 5 is used to make the input pickup current signal to be transformed to voltage signal, and carries out signal zero adjustment and filtering.It is made up of a zero potentiometer and some resistance, electric capacity, and it links to each other with described microprocessor 2.
First connector 6 is used to make the access of working power and sensor signal and be connected with external fieldbus, and it is connected with the field-bus interface module is two-way, and its output terminal links to each other with signal adjusting module 5 with described power conversion module 1;
Second connector 7 is used for described microprocessor 2 is programmed and debugged it and described 2 two-way linking to each other of microprocessor; The output of this second connector 7 is connected with external computing machine.
Owing to adopted described scheme, promptly select 12 fully integrated bit data acquisition system devices for use, make that the utility model printed circuit board sizes is little, function is complete, have high precision and high stability, and have low characteristics such as cost performance.
Principle of work of the present utility model is: the mould in the microprocessor/number conversion interface is the converting electrical signal of sensor output a digital signal by data acquisition, in microprocessor, carry out logical process and computing, and send result of calculation the CAN interface to carry out data communication, again by the CAN interface the digital data transmission of handling well in fieldbus networks.
The temperature/pressure sensor main circuit board of the utility model band fieldbus also has sensor is carried out fault self-diagnosis, range and functions such as ratio of damping, correction sensor characteristic are set except having sensor data acquisition and field bus communication function.Can make this utility model more can adapt to the complicated day by day needs of the big production of present modern industrialization.

Claims (2)

1, the main circuit board of Fieldbus Based temperature/pressure sensor is characterized in that, comprising: power conversion module, microprocessor, field-bus interface module, reset circuit module, signal adjusting module, first connector, second connector; Wherein:
The power conversion module is used for an input 24V supply voltage is become the 5V operating voltage, for each module of main circuit board provides one group of stable operating voltage;
Microprocessor is used for pick-up transducers signal, data processing and computing, and the output result, and its input end is connected with the output terminal of signal adjusting module with the reset circuit module respectively;
The field-bus interface module is used for providing differential sending function and to the differential reception of fieldbus bus to the fieldbus bus, and finishes all functions of Physical layer and data link layer automatically by standard, and it links to each other with described microprocessor is two-way.
The reset circuit module, be used to produce one by high step-down and one by the low level signal that uprises, respectively described microprocessor and described field-bus interface module are carried out initial electrification reset, its output terminal links to each other with the field-bus interface module with microprocessor respectively.
Signal adjusting module is used to make the input pickup current signal to be transformed to voltage signal, and carries out signal zero adjustment and filtering.Its output terminal links to each other with described microprocessor.
First connector is used to make the access of working power and sensor signal and be connected with external fieldbus, and it is connected with the field-bus interface module is two-way, and its output terminal links to each other with signal adjusting module with described power conversion module,
Second connector is used for described microprocessor is programmed and debugged, and it links to each other with described microprocessor is two-way.
2, the main circuit board of Fieldbus Based temperature/pressure sensor according to claim 1, it is characterized in that, described main circuit board also comprises the special connection to ground wire, should special connect and be: the ground wire of the power supply that the working power ground wire of all microprocessors on the main circuit board and mould/number conversion are used is connected respectively earlier, and then continuous these two kinds of ground wires with lead.
CN 02261659 2002-11-18 2002-11-18 Main circuit board based on field bus for temp/pressure sensor Expired - Fee Related CN2582057Y (en)

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CN 02261659 CN2582057Y (en) 2002-11-18 2002-11-18 Main circuit board based on field bus for temp/pressure sensor

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1313944C (en) * 2004-11-03 2007-05-02 上海大学 Intelligent transmitter device with embedded DeviceNet field bus interface
CN1959662B (en) * 2005-10-20 2010-05-12 联想（新加坡）私人有限公司 Computer, method for operating computer and computer system
CN102636306A (en) * 2012-03-30 2012-08-15 中国船舶重工集团公司第七○二研究所 Distributed strain collector for long-term safety monitoring of ship structure
CN101878456B (en) * 2007-11-30 2012-12-12 倍加福有限公司 Electrical circuit with physical layer diagnostics system
CN104535205A (en) * 2015-01-06 2015-04-22 上海自动化仪表股份有限公司 Multi-channel temperature value real-time transmission method based on FF protocol

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1313944C (en) * 2004-11-03 2007-05-02 上海大学 Intelligent transmitter device with embedded DeviceNet field bus interface
CN1959662B (en) * 2005-10-20 2010-05-12 联想（新加坡）私人有限公司 Computer, method for operating computer and computer system
CN101878456B (en) * 2007-11-30 2012-12-12 倍加福有限公司 Electrical circuit with physical layer diagnostics system
CN102636306A (en) * 2012-03-30 2012-08-15 中国船舶重工集团公司第七○二研究所 Distributed strain collector for long-term safety monitoring of ship structure
CN102636306B (en) * 2012-03-30 2014-04-16 中国船舶重工集团公司第七○二研究所 Distributed strain collector for long-term safety monitoring of ship structure
CN104535205A (en) * 2015-01-06 2015-04-22 上海自动化仪表股份有限公司 Multi-channel temperature value real-time transmission method based on FF protocol

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