CN103123474B - A kind of analog input output module and utilize this module to carry out the method for temperature sensing - Google Patents
A kind of analog input output module and utilize this module to carry out the method for temperature sensing Download PDFInfo
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- CN103123474B CN103123474B CN201110369654.8A CN201110369654A CN103123474B CN 103123474 B CN103123474 B CN 103123474B CN 201110369654 A CN201110369654 A CN 201110369654A CN 103123474 B CN103123474 B CN 103123474B
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Abstract
The invention discloses a kind of analog input output module, comprise MCU, the AO unit be connected with described MCU and AI unit.Analog input output module in the present invention, on the basis possessing original analog input function, modulating output function, achieves temperature detection function, thus improves the function utilization factor of module, has saved equipment cost.
Description
Technical field
The present invention relates to automatic control system field, particularly a kind of analog input output module and utilize this module to carry out the method for temperature sensing.
Background technology
Programmable logic controller (PLC) (ProgrammableLogicController, PLC) is a kind of electronic installation being applied to the digital operation of industrial environment.PLC is divided into fixed and modular two kinds, wherein, modular PLC is when controlling machinery or production run by analog input and output, need multiple analog expansion module, wherein analog input (AnalogInput, AI)/modulating output (AnalogOutput, AO) module is a kind of conventional simulation expansion module.
Existing AI/AO module comprises micro-control unit (MicroControlUnit, MCU), the AI unit be connected with MCU and AO unit.Wherein, AI unit is connected by the equipment that AI main track and AI negative wire are external with this AI/AO module, and AO unit is connected by the equipment that AO main track and AO negative wire are external with this AI/AO module.This AI/AO module supports AI pattern and AO pattern, can realize the switching of AI pattern and AO pattern according to the needs of different application under the control of MCU.AI pattern comprises electric current input pattern and voltage input pattern, and AO pattern comprises current output mode and voltage output mode.Therefore, under the control of MCU, existing AI/AO module can be set to any one pattern in electric current input pattern, voltage input pattern, current output mode, voltage output mode.Now, that no matter selects in four kinds of patterns is any, carries out work when AI unit and AO unit are differences.
Existing AI/AO module only supports AI pattern and AO pattern, does not support other pattern, such as, and resistance temperature detection (ResistanceTemperatureDetection, RTD) pattern.But, in the actual application of modular PLC, often can run into the scene needing to carry out temperature sensing.Now, when not increasing special temperature sensing module, utilize existing AI/AO module cannot meet the scene needs of this temperature sensing.
Summary of the invention
The invention provides a kind of analog input output module, it can realize temperature detection function on the basis possessing AI function and AO function, thus improves functions of modules utilization factor, saves equipment cost.
Analog input output module provided by the invention, comprise MCU, the AO unit be connected with described MCU and AI unit, wherein, described MCU, for when receiving the temperature sensing instruction for an external RTD sensor, control described AO unit and export analog current signal to described RTD sensor, control the analog voltage signal that described AI unit receives the output of described RTD sensor simultaneously; And for receiving the digital voltage signal that described AI unit exports, wherein, the corresponding described RTD sensor of described digital voltage signal detects the temperature value obtained; Described AO unit, for exporting described analog current signal to described RTD sensor under the control of described MCU; And described AI unit, for receiving the described analog voltage signal that described RTD sensor exports under the control of described MCU, and be transferred to described MCU after described analog voltage signal is converted to described digital voltage signal; Described MCU, also for when receiving the analog current signal output order for an external equipment, control AO unit exports analog current signal to described external equipment, and described AO unit also for exporting analog current signal to described external equipment under the control of described MCU; Described MCU, also for when receiving the analog voltage signal output order for an external equipment, control AO unit exports analog voltage signal to described external equipment, and described AO unit also for exporting analog voltage signal to described external equipment under the control of described MCU; Described MCU, also for when receiving the analog current signal input instruction for an external equipment, control AI unit receives the analog current signal that described external equipment exports, and described AI unit also for receiving the analog current signal that described external equipment exports under the control of described MCU; Described MCU, also for when receiving the analog voltage signal input instruction for an external equipment, control AI unit receives the analog voltage signal that described external equipment exports, and described AI unit also for receiving the analog voltage signal that described external equipment exports under the control of described MCU.This analog input output module adds temperature detection function on the basis of general AI/AO module original function, utilize this analog input output module can realize the integration of analog input function, modulating output function and temperature detection function, improve functions of modules utilization factor, save equipment cost.
In order to record the digital voltage signal detecting and obtain, described MCU also can be used for storing described digital voltage signal.
The type of RTD sensor is varied, the working current of different RTD sensors is different, therefore, in order to make this analog input output module versatility when carrying out temperature sensing stronger, can be quick when external different RTD sensor carries out temperature sensing, corresponding analog operation electric current is exported exactly to external RTD sensor, described MCU also can be used for pre-setting corresponding relation, described corresponding relation comprises the type of RTD sensor and the corresponding relation of analog current value, and the type containing external RTD sensor in described temperature sensing instruction, when receiving the temperature sensing instruction for external RTD sensor, described MCU is according to described corresponding relation, control described AO unit and export the described analog current signal with the analog current value corresponding with the type of described RTD sensor to described RTD sensor.
In order to can obtain fast that digital voltage signal characterizes, detect the temperature value that described RTD sensor obtains, described MCU also can be used for pre-setting corresponding relation, described corresponding relation comprises the corresponding relation of digital voltage signal and temperature value, when receiving the described digital voltage signal that described AI unit exports, described MCU obtains according to described corresponding relation the temperature value that described RTD sensor detects further.
This analog input output module, while support RTD pattern, also supports traditional analog current output mode, analog voltage output mode, analog current input pattern and analog voltage input pattern, to embody the multi-mode of this analog input output module.Therefore, when described MCU is also used in the analog current signal output order received for an external equipment, control described AO unit and export analog current signal to described external equipment, now described AO unit also for exporting analog current signal to described external equipment under the control of described MCU; When described MCU is also used in the analog voltage signal output order received for an external equipment, control described AO unit and export analog voltage signal to described external equipment, now described AO unit also for exporting analog voltage signal to described external equipment under the control of described MCU; When described MCU is also used in the analog current signal input instruction received for an external equipment, control the analog current signal that described AI unit receives the output of described external equipment, now described AI unit also for receiving the analog current signal that described external equipment exports under the control of described MCU; When described MCU is also used in the analog voltage signal input instruction received for an external equipment, control the analog voltage signal that described AI unit receives the output of described external equipment, now described AI unit also for receiving the analog voltage signal that described external equipment exports under the control of described MCU.
The present invention also provides a kind of PLC, comprises any one analog input output module above-mentioned.In the practical application of PLC, just can possess AI function, AO function and RTD function by an analog input output module simultaneously, improve the function utilization factor of module, saved equipment cost.
The present invention also provides a kind of method utilizing analog input output module to carry out temperature sensing, described analog input output module is above-mentioned analog input output module, the method comprises: described MCU is when receiving the temperature sensing instruction for an external RTD sensor, control AO unit exports analog current signal to described RTD sensor, and control AI unit receives the analog voltage signal that described RTD sensor exports simultaneously; Described AO unit, under the control of described MCU, exports analog current signal to described RTD sensor; Described AI unit receives the described analog voltage signal that described RTD sensor exports, received described analog voltage signal is converted to described digital voltage signal, and be transferred to described MCU, wherein, the corresponding described RTD sensor of described digital voltage signal detects the temperature value obtained; And described MCU receives described digital voltage signal from described AI unit.Utilize the method, general AI/AO module can be made on the basis of original function to increase temperature detection function, improve functions of modules utilization factor, save equipment cost.
In order to record the digital voltage signal detecting and obtain, the MCU receiving described digital voltage signal also stores described digital voltage signal.
The type of RTD sensor is varied, the working current of different RTD sensors is different, therefore, in order to make this analog input output module versatility when carrying out temperature sensing stronger, can be quick when external different RTD sensor carries out temperature sensing, corresponding analog operation electric current is exported exactly to external RTD sensor, described MCU also can pre-set corresponding relation, described corresponding relation comprises the type of RTD sensor and the corresponding relation of analog current value, and the type containing external RTD sensor in described temperature sensing instruction, when receiving the temperature sensing instruction for external RTD sensor, described MCU is according to described corresponding relation, control described AO unit and export the described analog current signal with the analog current value corresponding with the type of described RTD sensor to described RTD sensor.
In order to can obtain fast that digital voltage signal characterizes, detect the temperature value that described RTD sensor obtains, described MCU also can pre-set corresponding relation, described corresponding relation comprises the corresponding relation of digital voltage signal and temperature value, when receiving the described digital voltage signal that described AI unit exports, described MCU obtains according to described corresponding relation the temperature value that described RTD sensor detects further.
Accompanying drawing explanation
The preferred embodiments of the present invention will be described in detail by referring to accompanying drawing below, the person of ordinary skill in the art is more clear that above-mentioned and other feature and advantage of the present invention, in accompanying drawing:
Fig. 1 is the structural representation of the analog input output module of the embodiment of the present invention;
Fig. 2 is the schematic diagram of the external RTD sensor of analog input output module of the embodiment of the present invention;
Fig. 3 is the schematic flow sheet of the temperature detection method in the embodiment of the present invention.
Description of reference numerals:
100 analog input output modules
11MCU
12AO unit
13AI unit
14AO main track
15AO negative wire
16AI main track
17AI negative wire
21RTD sensor
The step of S301 ~ S304 process flow diagram
Embodiment
The analog input output module that the embodiment of the present invention provides, comprises MCU, the AO unit be connected with described MCU and AI unit.
This analog input output module can support AO pattern, AI pattern and RTD pattern.Particularly, this analog input output module when being set to AO pattern, by AI unit for its external equipment provides analog current signal or analog voltage signal; This analog input output module, when being set to AI pattern, receives analog current signal or the analog voltage signal of its external equipment output by AO unit; In the present invention, this analog input output module is when being set to RTD pattern, and its AI unit and AO unit can work simultaneously, and carries out temperature sensing by an external RTD sensor simultaneously.
Fig. 1 is the structural representation of the analog input output module of the embodiment of the present invention.
Shown in Figure 1, the analog input output module 100 that the embodiment of the present invention provides comprises: MCU11, the AO unit 12 be connected with described MCU11 and AI unit 13, wherein,
MCU11, when receiving the temperature sensing instruction for an external RTD sensor, control AO unit 12 exports analog current signal to described RTD sensor, and control AI unit 13 receives the analog voltage signal that described RTD sensor exports simultaneously; Further, MCU11 receives the digital voltage signal that AI unit 13 exports, and wherein, the corresponding described RTD sensor of described digital voltage signal detects the temperature value obtained;
AO unit 12, exports analog current signal to described RTD sensor under the control of described MCU11;
AI unit 13, receives the analog voltage signal that described RTD sensor exports, and described analog voltage signal is converted to digital voltage signal is transferred to described MCU11 under the control of described MCU11.
Here, in order to record the digital voltage signal detecting and obtain, described MCU11 also can be used for storing described digital voltage signal.
Described AO unit 12 exports analog current signal by AO main track and AO negative wire to described RTD sensor, and described AI unit 13 receives the analog voltage signal of described RTD sensor output by AI main track and AI negative wire.
The type of RTD sensor is varied, the working current of different RTD sensors is different, therefore, in order to make this analog input output module versatility when carrying out temperature sensing stronger, can be quick when external different RTD sensor carries out temperature sensing, corresponding analog operation electric current is exported exactly to external RTD sensor, described MCU11 can pre-set corresponding relation, described corresponding relation comprises the type of RTD sensor and the corresponding relation of analog current value, and the type containing external RTD sensor in described temperature sensing instruction, when receiving the temperature sensing instruction for external RTD sensor, described MCU11 is according to described corresponding relation, control described AO unit 12 and export the described analog current signal with the analog current value corresponding with the type of described RTD sensor to described RTD sensor.
In order to can obtain fast that digital voltage signal characterizes, detect the temperature value that described RTD sensor obtains, described MCU11 also can pre-set corresponding relation, described corresponding relation comprises the corresponding relation of digital voltage signal and temperature value, when receiving the described digital voltage signal that described AI unit 13 exports, described MCU11 obtains according to described corresponding relation the temperature value that described RTD sensor detects further.
The analog input output module that the embodiment of the present invention provides adds temperature detection function on the basis of general AI/AO module original function, utilizes this analog input output module can realize the integration of analog input function, modulating output function and temperature detection function.So, this analog input output module, while support RTD pattern, also support that traditional analog current output mode, analog voltage output mode, analog current input pattern and analog voltage input pattern are to embody the multi-mode of this analog input output module, principle when stating four kinds of traditional modes below in conjunction with Fig. 1 in realization to this analog input output module is set forth:
Described MCU11, when being also used in the analog current signal output order received for an external equipment, control AO unit 12 exports analog current signal to described external equipment, and now described AO unit 12 also for exporting analog current signal to described external equipment under the control of described MCU11;
Described MCU11, when being also used in the analog voltage signal output order received for an external equipment, control AO unit 12 exports analog voltage signal to described external equipment, and now described AO unit 12 also for exporting analog voltage signal to described external equipment under the control of described MCU11;
Described MCU11, when being also used in the analog current signal input instruction received for an external equipment, control AI unit 13 receives the analog current signal that described external equipment exports, and now described AI unit 13 also for receiving the analog current signal that described external equipment exports under the control of described MCU11;
Described MCU11, when being also used in the analog voltage signal input instruction received for an external equipment, control AI unit 13 receives the analog voltage signal that described external equipment exports, and now described AI unit 13 also for receiving the analog voltage signal that described external equipment exports under the control of described MCU11.
Utilizing the analog input output module shown in Fig. 1 when carrying out temperature sensing, need an external RTD sensor, as shown in Figure 2, the AO main track 14 be connected with AO unit 12 and AO negative wire 15 are connected the two ends of RTD sensor 21 respectively, and the analog current signal that AO unit 12 is exported flows through RTD sensor 21; The two ends of RTD sensor 21 connect the AI main track 16 and AI negative wire 17 that are connected with AI unit 13 respectively simultaneously, then, when analog current signal flows through RTD sensor 21, pressure drop appears in RTD sensor 21 two ends.AI unit 13 detects the pressure drop at RTD sensor 21 two ends by AI main track 16 and AI negative wire 17, obtain an analog voltage signal, and this analog voltage signal is converted to digital voltage signal is transferred to MCU11, this digital voltage signal characterizes the temperature value that RTD sensor 21 detects.Now, MCU11 obtains this digital voltage signal, according to the corresponding relation of the digital voltage signal pre-set and temperature value, just can to obtain by RTD sensor 21 detect the temperature value obtained.In order to record the digital voltage signal detecting and obtain, described digital voltage signal can be stored in the memory storage of described MCU11 or analog input output module outside.
Fig. 3 is the schematic flow sheet of the temperature detection method in the embodiment of the present invention.
Shown in Figure 3, a kind of method utilizing analog input output module to carry out temperature sensing that the embodiment of the present invention provides, described analog input output module comprises MCU, the AO unit be connected with described MCU and AI unit, and the method comprises following step:
S301: described MCU when receiving the temperature sensing instruction for an external RTD sensor, and control AO unit exports analog current signal to described RTD sensor, and control AI unit receives the analog voltage signal that described RTD sensor exports simultaneously.
Here, the AO main track be connected with AO unit in described analog input output module and AO negative wire connect the two ends of described RTD sensor respectively, and the analog current signal that AO unit is exported flows through described RTD sensor by AO main track and AO negative wire; The AI main track be connected with AI unit in described analog input output module and AI negative wire are connected the two ends of described RTD sensor simultaneously respectively, flow through described RTD sensor there being current signal and described RTD sensor produce pressure drop time, export an analog voltage signal according to this pressure drop, and be transferred to AI unit by AI main track and AI negative wire.
S302: described AO unit, under the control of described MCU, exports analog current signal to described RTD sensor.
The type of RTD sensor is varied, the working current of different RTD sensors is different, therefore, in order to make this analog input output module versatility when carrying out temperature sensing stronger, can be quick when external different RTD sensor carries out temperature sensing, corresponding analog operation electric current is exported exactly to external RTD sensor, described MCU can pre-set corresponding relation, described corresponding relation comprises the type of RTD sensor and the corresponding relation of analog current value, and the type containing external RTD sensor in described temperature sensing instruction, when receiving the temperature sensing instruction for external RTD sensor, described MCU is according to described corresponding relation, control described AO unit and export the described analog current signal with the analog current value corresponding with the type of described RTD sensor to described RTD sensor.
Here, the corresponding relation of RTD sensor type and analog current value in corresponding relation set by MCU, AO unit is by being connected to AO main track and the AO negative wire at described RTD sensor two ends, to described RTD sensor export have with the analog current signal of analog current value corresponding to external RTD sensor type, the analog current signal that AO unit is exported flows through described RTD sensor by AO main track and AO negative wire.
S303: the analog voltage signal received is converted to digital voltage signal and is transferred to described MCU by described AI unit, wherein, described digital voltage signal characterizes described RTD sensor and detects the temperature value obtained.
Here, when there being analog current signal to flow through described RTD sensor, the two ends of described RTD sensor will produce pressure drop, therefore, by output one analog voltage signal, described AI unit receives the analog voltage signal of described RTD sensor output by AI main track and AI negative wire.
S304:MCU receives described digital voltage signal from AI unit.
Here, MCU can store described digital voltage signal, also digital voltage signal can be stored in the memory storage of analog input output module outside.
In order to can obtain fast that digital voltage signal characterizes, detect the temperature value that described RTD sensor obtains, described MCU also can pre-set corresponding relation, described corresponding relation comprises the corresponding relation of digital voltage signal and temperature value, when receiving the described digital voltage signal that described AI unit exports, described MCU obtains according to described corresponding relation the temperature value that described RTD sensor detects further.
The analog input output module that the embodiment of the present invention provides not only can realize temperature detection function, analog current signal output function, analog current signal input function, analog voltage signal output function and analog voltage signal input function can also be realized, when stating four kinds of functions in realization, identical with the implementation method of AI/AO module in prior art.
The embodiment of the present invention provides a kind of PLC simultaneously, comprise the analog input output module in above-mentioned any one embodiment, then in the practical application of PLC, just can possess AI function, AO function and RTD function by an analog input output module simultaneously, extend the function of general AI/AO module, improve module utilization factor, reduce production cost.
As seen through the above technical solutions, a kind of analog input output module that the embodiment of the present invention provides adds temperature detection function on the basis of general AI/AO module, when this analog input output module is set to RTD pattern, the MCU of described analog input output module is receiving the temperature sensing instruction for an external RTD sensor, control AO unit exports analog current signal by AO main track and AO negative wire to described RTD sensor, control AI unit receives the analog voltage signal of described RTD sensor output by AI main track and AI negative wire simultaneously, described analog voltage signal is converted to digital voltage signal and is transferred to described MCU by described AI unit, wherein, described digital voltage signal characterizes described RTD sensor and detects the temperature value obtained.Therefore, the analog input output module that the embodiment of the present invention provides has possessed AI function, AO function and temperature detection function simultaneously, improves the function utilization factor of module, has saved equipment cost.
Although illustrate and describe embodiments of the invention, those having ordinary skill in the art will appreciate that: when not departing from principle of the present invention and aim, can carry out multiple change, amendment, replacement and modification to these embodiments, scope of the present invention is by claim and equivalents thereof.
Claims (9)
1. an analog input output module, comprises micro-control unit MCU (11), the modulating output AO unit (12) be connected with described MCU (11) and analog input AI unit (13), it is characterized in that,
Described MCU (11), for when receiving the temperature sensing instruction for external resistance temperature detection RTD sensor (21), control described AO unit (12) and export analog current signal to described RTD sensor (21), control described AI unit (13) simultaneously and receive the analog voltage signal that described RTD sensor (21) exports; And for receiving the digital voltage signal that described AI unit (13) exports, wherein, the temperature value that obtains of corresponding described RTD sensor (21) detection of described digital voltage signal;
Described AO unit (12), for exporting described analog current signal to described RTD sensor (21) under the control of described MCU (11); And
Described AI unit (13), for receiving the described analog voltage signal that described RTD sensor (21) exports under the control of described MCU (11), and be transferred to described MCU (11) after described analog voltage signal is converted to described digital voltage signal;
Described MCU (11), also for when receiving the analog current signal output order for an external equipment, control AO unit (12) exports analog current signal to described external equipment, and described AO unit (12) also for exporting analog current signal to described external equipment under the control of described MCU (11);
Described MCU (11), also for when receiving the analog voltage signal output order for an external equipment, control AO unit (12) exports analog voltage signal to described external equipment, and described AO unit (12) also for exporting analog voltage signal to described external equipment under the control of described MCU (11);
Described MCU (11), also for when receiving the analog current signal input instruction for an external equipment, control AI unit (13) receives the analog current signal that described external equipment exports, and described AI unit (13) also for receiving the analog current signal that described external equipment exports under the control of described MCU (11);
Described MCU (11), also for when receiving the analog voltage signal input instruction for an external equipment, control AI unit (13) receives the analog voltage signal that described external equipment exports, and described AI unit (13) also for receiving the analog voltage signal that described external equipment exports under the control of described MCU (11).
2. analog input output module as claimed in claim 1, it is characterized in that, described MCU (11) is also for storing described digital voltage signal.
3. analog input output module as claimed in claim 1, it is characterized in that, described MCU (11) is also for pre-setting corresponding relation, described corresponding relation comprises the type of RTD sensor and the corresponding relation of analog current value, and the type containing external RTD sensor (21) in described temperature sensing instruction
When receiving the described temperature sensing instruction for external RTD sensor (21), described MCU (11), according to described corresponding relation, controls described AO unit (12) has described analog current signal from the analog current value corresponding with the type of described RTD sensor (21) to the output of described RTD sensor (21).
4. analog input output module as claimed in claim 1, it is characterized in that, described MCU (11) is also for pre-setting corresponding relation, and described corresponding relation comprises the corresponding relation of digital voltage signal and temperature value,
When receiving the described digital voltage signal that described AI unit (13) exports, described MCU (11) obtains according to described corresponding relation the temperature value that described RTD sensor (21) detects further.
5. a programmable logic controller (PLC), is characterized in that, comprises the analog input output module in Claims 1 to 4 described in any one.
6. utilize analog input output module to carry out a method for temperature sensing, described analog input output module is analog input output module as claimed in claim 1, and it is characterized in that, the method comprises:
Described MCU is when receiving the temperature sensing instruction for an external resistance temperature detection RTD sensor, control described AO unit to export analog current signal to described RTD sensor, control the analog voltage signal (S301) that described AI unit receives the output of described RTD sensor simultaneously;
Described AO unit, under the control of described MCU, exports analog current signal (S302) to described RTD sensor;
Described AI unit receives the described analog voltage signal that described RTD sensor exports, received described analog voltage signal is converted to described digital voltage signal, and be transferred to described MCU, wherein, the corresponding described RTD sensor of described digital voltage signal detects the temperature value (S303) obtained; And
Described MCU receives described digital voltage signal (S304) from described AI unit.
7. method as claimed in claim 6, it is characterized in that, the method also comprises:
Described MCU stores described digital voltage signal.
8. method as claimed in claim 6, it is characterized in that, the method also comprises:
Described MCU pre-sets corresponding relation, and described corresponding relation comprises the type of RTD sensor and the corresponding relation of analog current value, and the type containing external RTD sensor in described temperature sensing instruction,
When receiving the temperature sensing instruction for external RTD sensor, described MCU, according to described corresponding relation, controls described AO unit and exports the described analog current signal with the analog current value corresponding with the type of described RTD sensor to described RTD sensor.
9. method as claimed in claim 6, it is characterized in that, the method also comprises:
Described MCU pre-sets corresponding relation, and described corresponding relation comprises the corresponding relation of digital voltage signal and temperature value,
When receiving the digital voltage signal that described AI unit exports, described MCU obtains according to described corresponding relation the temperature value that described RTD sensor detects.
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| CN101504554A (en) * | 2009-02-23 | 2009-08-12 | 桂林工学院 | Input signal processing method for on-site bus type temperature observing and controlling module |
| CN101592961A (en) * | 2008-05-26 | 2009-12-02 | Ls产电株式会社 | Temperature control modules and temperature-controlled process |
| CN202351653U (en) * | 2011-11-18 | 2012-07-25 | 西门子公司 | Analog input/output module |
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| CN101592961A (en) * | 2008-05-26 | 2009-12-02 | Ls产电株式会社 | Temperature control modules and temperature-controlled process |
| CN101504554A (en) * | 2009-02-23 | 2009-08-12 | 桂林工学院 | Input signal processing method for on-site bus type temperature observing and controlling module |
| CN202351653U (en) * | 2011-11-18 | 2012-07-25 | 西门子公司 | Analog input/output module |
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