CN101504554B - Input signal processing method for on-site bus type temperature observing and controlling module - Google Patents
Input signal processing method for on-site bus type temperature observing and controlling module Download PDFInfo
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- CN101504554B CN101504554B CN2009101138874A CN200910113887A CN101504554B CN 101504554 B CN101504554 B CN 101504554B CN 2009101138874 A CN2009101138874 A CN 2009101138874A CN 200910113887 A CN200910113887 A CN 200910113887A CN 101504554 B CN101504554 B CN 101504554B
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Abstract
The invention discloses a method for processing an input signal of an on-site bus-type temperature measurement and control module. The method comprises the following: 1, the on-site bus-type temperature measurement and control module mainly comprises a singlechip, constant current sources I1 and I2, electronic switches of SW1 to SW5, and AD converting circuit and an RS485 interface, each type of input signal is allocated with a configuration code, the singlechip receives a configuration command to control the connection and the disconnection of the electronic switches so that the switches arecombined to form an interface circuit corresponding to the input signal; 2, a thermocouple uses a two-wire system interface, the electronic switches of SW1 to SW5 are disconnected when the temperature is detected, and the singlechip controls the SW1 and the SW5 to be connected and uses an AD over-range signal to achieve disconnection detection of the thermocouple; 3, a thermal resistor uses a three-wire system interface, the SW1 and the SW2 are closed while other electronic switches are disconnected when the temperature is detected, and the singlechip controls the state of the SW1 to the SW5 to perform disconnection detection on three lines of the thermal resistor Rt; 4, a voltage source V uses the two-wire system interface, all the electronic switches are detected normally to be disconnected, and the singlechip controls the conduction of the SW1 to achieve the disconnection detection of the input signal; and 5, a current source I uses the two-wire system interface, and the SW3 and the SW4 are connected while other switches are disconnected.
Description
Technical field
The present invention relates to a kind of incoming signal processing method of temperature sensor, this method can be applied to the signal Processing of thermopair, thermal resistance temperature sensor, also applicable to the processing of 0-5V voltage signal, 4-20mA current signal.
Background technology
In industrial process control, difference according to measured and observing and controlling performance requirement, may use multiple different temperature sensor, sensor may directly be received on the bus type temperature course control module, delivers on the temperature control modules after also may being transformed into the standard signal of 0-5V or 4-20mA by transmitter again.Current process control is generally wished to come each functional module in the system is configured and configuration by software, constitute needed Process Control System, in order to adapt to different sensors and input signal, usually utilize the manual state that changes jumper switch, perhaps select special different control module to adapt to different sensors or input signal source, the method for this manual wire jumper is made troubles to system configuration.
Summary of the invention
The invention provides a kind of input signal processing method for on-site bus type temperature observing and controlling module.Can be applicable to thermopair, thermal resistance, voltage source, current source signal input respectively by software arrangements by the software arrangements input interface circuit based on microprocessor.
(1) interface circuit is made of single-chip microcomputer, constant current source I1 and I2, low on-resistance electronic switch SW1～SW5, the AD circuit with gain-programmed amplifier and corresponding resistance-capacitance network, RS485 communication interface, each different input signal all has a customized configuration coding, and single-chip microcomputer constitutes the input interface circuit of varying input signal according to configuration information by the on off operating mode that control signal S1, S2, S3, S4, S5 control electronic switch SW1, SW2, SW3, SW4, SW5;
(2) thermopair uses the two-wire system interface, and thermopair utilizes JP-1 and JP-2 to insert, and Single-chip Controlling disconnects electronic switch SW2, SW3, SW4, constitutes the thermopair input interface; SW1 and SW5 disconnect when normal temperature detects, and thermocouple signal send the AD with gain-programmed amplifier circuit; Single-chip microcomputer makes SW1 and SW5 closure utilize the overrange signal of AD to realize the thermopair burn out detection by control;
(3) thermal resistance uses the three-wire system interface, and thermal resistance Rt inserts by JP-1, JP-2, JP-3, and Single-chip Controlling disconnects electronic switch SW3 and SW5, constitutes the thermal resistance input interface; Single-chip microcomputer output control signal S1=S2=1, S4=0 disconnected SW1 and SW2 closure, SW4 when normal temperature detected, by constant current source I1, I2, resistance R 1, Rt constitute measuring bridge and carry out temperature detection, and output signal is delivered to the AD circuit with gain-programmed amplifier; Single-chip microcomputer is controlled the different break-make combinations of SW1, SW2, SW4 respectively and is utilized the burn out detection of the overrange signal realization of AD to thermal resistance by output control signal S1, S2, S4;
(4) voltage source V is used the two-wire system interface, inserts by JP-1, JP-2, and Single-chip Controlling makes electronic switch S2=S3=S5=0, S4=1 make SW2, SW3, SW5 disconnection, SW4 conducting, constitutes the voltage input interface circuit; SW1 disconnects during normal the measurement, and input voltage signal is delivered to the AD circuit with gain-programmed amplifier; Single-chip microcomputer makes the SW conducting and utilizes the overrange signal of AD to realize the voltage input signal burn out detection by output control signal S1=1;
(5) current source I uses the two-wire system interface, insert by JP-1, JP-2, Single-chip Controlling electronic switch SW1, SW2, SW5 disconnect, SW3, SW4 conducting, constitute the electric current input interface circuit, input current signal send the AD circuit with gain-programmed amplifier after resistance R 3 converts voltage signal to.
The sensor input signal treatment circuit that the present invention provides adapts to sensor automatically by configuration software, has the sensor automatic measuring ability that breaks simultaneously.
Description of drawings
Fig. 1 has the two-wire system thermopair input interface circuit of the automatic measuring ability of broken string for the present invention.
Fig. 2 is the three-wire system thermal resistance input interface circuit with the automatic measuring ability of broken string of the present invention.
Fig. 3 is a 0-5V voltage signal input interface circuit of the present invention.
Fig. 4 is a 4-20mA current signal input interface circuit of the present invention.
Fig. 5 is compound input interface of the present invention and control and the AD circuit with gain-programmed amplifier.
Fig. 6 is a constant-current source circuit of the present invention.
Embodiment
Embodiment:
Example as shown in Figure 5, constant current source is as shown in Figure 6.Electronic switch SW1～SW4 uses high voltage low on-resistance type electronic switch, single-chip microcomputer uses AT89C52 (or C8551F021), AD circuit with gain-programmed amplifier uses 16 delta sigma type serial line interfaces of inner band range control to have the AD circuit CS5523 of gain-programmed amplifier, has 25mV, 55mV, 100mV, 1V, 2.5V, six ranges of 5V, just can select needed range as long as write corresponding measurement range selection control word, transformation result has the outrange sign.Single-chip microcomputer is by P31.5～P1.7, and P2.0 simulation SPI interface signal is write configuration (control) information and read transformation result to AD.
(1) thermopair uses the two-wire system interface, and thermopair utilizes JP-1 and JP-2 to insert, and single-chip microcomputer output control signal S2=S3=S4=0 disconnects electronic switch SW2, SW3, SW4, constitutes thermopair input interface shown in Figure 1; When normal temperature detects, control signal S1=0, S5=0, electronic switch SW1 and SW5 disconnect, and thermocouple signal is delivered to the AD circuit with gain-programmed amplifier; The galvanic couple burn out detection was carried out at every interval in 1 minute No. one time, and the control signal of single-chip microcomputer output at this moment S1=1, S5=1 make SW1 and SW5 closure, realize the thermopair burn out detection by the overrange signal of AD;
(2) thermal resistance uses the three-wire system interface, and thermal resistance Rt inserts by JP-1, JP-2, JP-3, and single-chip microcomputer output control signal S 3=S5=0 disconnects SW3 and SW5, constitutes thermal resistance input interface shown in Figure 2; Single-chip microcomputer output control signal S1=S2=1, S4=0 disconnected SW1 and SW2 closure, SW4 when normal temperature detected, by constant current source I1, I2, resistance R 1, Rt constitute measuring bridge and carry out temperature detection, and the electric bridge output signal is delivered to the AD circuit with gain-programmed amplifier; The resistance burn out detection was carried out at every interval in 1 minute one time, and at this moment single-chip microcomputer is exported control signal S1, S2, S4, controlled the various combination of SW1, SW2, SW4 break-make respectively, realized the thermopair burn out detection by the overrange signal of AD conversion;
(3) voltage source V is used the two-wire system interface, inserts by JP-1, JP-2, and single-chip microcomputer output control signal S2=S 3=S 5=0, S4=1 make SW2, SW3, SW5 disconnection, SW4 conducting, constitute voltage input interface circuit shown in Figure 3; SW1 disconnects during normal the measurement, and input voltage signal send the AD with gain-programmed amplifier circuit; Burn out detection was carried out at every interval in 1 minute one time, and at this moment single-chip microcomputer output control signal S1=1 makes the SW1 conducting, and the overrange signal of the AD circuit by having gain-programmed amplifier is realized the voltage input signal burn out detection;
(4) current source I uses the two-wire system interface, inserts by JP-1, JP-2.Single-chip microcomputer constant output control signal S1=S2=S5=0, S3=S4=1, make SW1, SW2, SW5 disconnection, SW3, SW4 conducting, constitute electric current input interface circuit shown in Figure 4, input current signal send the AD circuit with gain-programmed amplifier after resistance R 3 converts voltage signal to;
(5) single-chip microcomputer is by SPI or utilize the general purpose I of single-chip microcomputer/O port simulation SPI interface to carry out the AD conversion and control and read the AD transformation result, utilizes the RS485 interface to receive configuration information and transmits the AD transformation result.
Claims (1)
1. input signal processing method for on-site bus type temperature observing and controlling module is characterized in that:
(1) interface circuit is made of single-chip microcomputer, constant current source I1 and I2, low on-resistance electronic switch SW1～SW5, the AD circuit with gain-programmed amplifier and corresponding resistance-capacitance network, RS485 communication interface, each different input signal all has a customized configuration coding, and single-chip microcomputer constitutes the input interface circuit of varying input signal according to configuration information by the on off operating mode that control signal S1, S2, S3, S4, S5 control electronic switch SW1, SW2, SW3, SW4, SW5;
(2) thermopair uses the two-wire system interface, and thermopair utilizes JP-1 and JP-2 to insert, and Single-chip Controlling disconnects electronic switch SW2, SW3, SW4, constitutes the thermopair input interface; SW1 and SW5 disconnect when normal temperature detects, and thermocouple signal send the AD with gain-programmed amplifier circuit; Single-chip microcomputer makes SW1 and SW5 closure utilize the overrange signal of AD to realize the thermopair burn out detection by control;
(3) thermal resistance uses the three-wire system interface, and thermal resistance Rt inserts by JP-1, JP-2, JP-3, and Single-chip Controlling disconnects electronic switch SW3 and SW5, constitutes the thermal resistance input interface; Single-chip microcomputer output control signal S1=S2=1, S4=0 disconnected SW1 and SW2 closure, SW4 when normal temperature detected, by constant current source I1, I2, resistance R 1, Rt constitute measuring bridge and carry out temperature detection, and output signal is delivered to the AD circuit with gain-programmed amplifier; Single-chip microcomputer is controlled the different break-make combinations of SW1, SW2, SW4 respectively and is utilized the burn out detection of the overrange signal realization of AD to thermal resistance by output control signal S1, S2, S4;
(4) voltage source V is used the two-wire system interface, inserts by JP-1, JP-2, and Single-chip Controlling makes electronic switch S2=S3=S5=0, S4=1 make SW2, SW3, SW5 disconnection, SW4 conducting, constitutes the voltage input interface circuit; SW1 disconnects during normal the measurement, and input voltage signal is delivered to the AD circuit with gain-programmed amplifier; Single-chip microcomputer makes the SW conducting and utilizes the overrange signal of AD to realize the voltage input signal burn out detection by output control signal S1=1;
(5) current source I uses the two-wire system interface, insert by JP-1, JP-2, Single-chip Controlling electronic switch SW1, SW2, SW5 disconnect, SW3, SW4 conducting, constitute the electric current input interface circuit, input current signal send the AD circuit with gain-programmed amplifier after resistance R 3 converts voltage signal to.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009101138874A CN101504554B (en) | 2009-02-23 | 2009-02-23 | Input signal processing method for on-site bus type temperature observing and controlling module |
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| CN2009101138874A CN101504554B (en) | 2009-02-23 | 2009-02-23 | Input signal processing method for on-site bus type temperature observing and controlling module |
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| CN101504554B true CN101504554B (en) | 2011-02-09 |
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| CN103123474B (en) * | 2011-11-18 | 2016-01-27 | 西门子公司 | A kind of analog input output module and utilize this module to carry out the method for temperature sensing |
| CN102865941B (en) * | 2012-10-10 | 2014-04-16 | 成都阜特科技股份有限公司 | Method for collecting and determining temperature |
| CN108011796A (en) * | 2017-12-08 | 2018-05-08 | 华轩控制系统(上海)有限公司 | A kind of intelligent temperature acquisition system |
| CN112953501B (en) * | 2021-01-27 | 2023-09-26 | 宿州市泰华仪表有限公司 | Universal signal input circuit for intelligent instrument |
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