CN101105691A - Input and output enlargement module and programmable controller system - Google Patents
Input and output enlargement module and programmable controller system Download PDFInfo
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- CN101105691A CN101105691A CNA2007100281490A CN200710028149A CN101105691A CN 101105691 A CN101105691 A CN 101105691A CN A2007100281490 A CNA2007100281490 A CN A2007100281490A CN 200710028149 A CN200710028149 A CN 200710028149A CN 101105691 A CN101105691 A CN 101105691A
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Abstract
The invention discloses an input and output expansion module and a programmable controller system; the programmable controller system comprises CPU, a first sensor, a second sensor and an input and output expansion module; wherein the input and output expansion module comprises a passage selection unit, a main control unit and a bus interface; wherein the passage selection unit is respectively connected with the first sensor and the second sensor through a first input passage and a second input passage and is used to select the first input passage or the second input passage to input signals; the main control unit is used to control the passage selection unit and transforms the signals input by the passage selection unit into digital signals; the bus interface is used to transfer the signals processed by the main control unit into CPU to be processed. The first input passage and the second input passage in the invention input two signals by the utilization of the expansion module, which effectively reduces occupied space and lowers cost.
Description
Technical field
The present invention relates to the programmable logic controller (PLC) field, relate in particular to a kind of input and output enlargement module and programable controller system of being used for.
Background technology
(advantage such as Programmable Controller PC) as a kind of general Electronic Control scheme, has the reliability height, and dirigibility is good is widely used in the air-conditioning equipment product by air-conditioning equipment manufacturer Programmable Logic Controller.
At present, the air-conditioning equipment that adopts programable controller system to control is generally used two temperature survey passages and two voltage input channels, as shown in Figure 1, described programable controller system comprises: and CPU (central processing unit) (Central Processing Unit, CPU), temperature-measuring module 11 and voltage load module 12.
Wherein, temperature-measuring module 11 has an analog to digital converter, and (Analog Digital Converter ADC), connects a plurality of temperature sensors by multi-way switch or switch arrays, the input signal of each passage of ADC circulating sampling, sampled result will send CPU to by core bus.
From the above, the programable controller system of air-conditioning equipment adopts two expansion modules (temperature-measuring module and voltage load module) at present, makes this system take up room greatly the cost height.
Summary of the invention
Embodiment of the invention technical matters to be solved is, a kind of input and output enlargement module and programable controller system are provided, realized that two kinds of signals of first input channel and second input channel import in a module, reduced taking of spatial area effectively, and reduced cost.
In order to solve the problems of the technologies described above, a kind of input and output enlargement module of the embodiment of the invention, it comprises:
The channel selecting unit is used to select first input channel or second input channel with input signal;
Main control unit is used to control described channel selecting cell operation, and the conversion of signals that described channel selecting unit is imported is a digital signal;
Bus interface is used for the result's output after the described main control unit processing.
Preferably, described expansion module also further comprises:
Dispensing unit is used to dispose the running parameter of described expansion module, and described running parameter comprises: input type, fixed setting, measuring unit, the mode of connection, fault detect.
Wherein, described main control unit comprises:
Analog to digital converter, the conversion of signals that is used for the input of described channel selecting unit is a digital signal;
Control module is used for according to the running parameter of described dispensing unit configuration described channel selecting unit and analog to digital converter being controlled.
Described control module comprises:
The parameter detecting unit is used to detect the running parameter that described dispensing unit disposes;
Channel control unit is used for connecting first input channel or second input channel according to described running parameter control channel selected cell;
The parameter adjustment unit is used for the parameter according to the running parameter adjustment analog to digital converter of described dispensing unit configuration;
The sampled result processing unit is used for that the data after the described analog to digital converter processing are done further processing and specifically comprises: tables look-up and linear interpolation, unit conversion, overrange detection, mark channel state, smothing filtering, 16 significance bits of intercepting and calculation check value;
Output unit is used for the data after the described sampled result processing unit processes are outputed to bus interface as a result.
Preferably, described first input channel is the temperature input channel, and second input channel is the voltage/current input channel; Described channel selecting unit is multi-way switch or switch arrays.
Correspondingly, the present invention also provides a kind of programable controller system, it comprises: CPU, first sensor and second sensor, wherein, described system comprises that also one is used for the input and output enlargement module that first signal and secondary signal with the first sensor and second sensor acquisition send CPU to, and it comprises:
The channel selecting unit is connected with second sensor with first sensor respectively with second input channel by first input channel, is used to select first input channel or second input channel with input signal;
Main control unit is used to control described channel selecting cell operation, and the conversion of signals that described channel selecting unit is imported is a digital signal;
Bus interface is used for that the data after handling through described main control unit are sent to CPU and handles.
Wherein, described input and output enlargement module also comprises a dispensing unit, is used to dispose the running parameter of described expansion module, and described running parameter comprises: input type, fixed setting, measuring unit, the mode of connection, fault detect.
Wherein, described main control unit comprises:
Analog to digital converter, the conversion of signals that is used for the input of described channel selecting unit is a digital signal;
Control module is used for according to the running parameter of described dispensing unit configuration described channel selecting unit and analog to digital converter being controlled.
And described control module comprises:
The parameter detecting unit is used to detect the running parameter that dispensing unit disposes;
Channel control unit is used for controlling described channel unit according to described running parameter and connects first input channel or second input channel;
The parameter adjustment unit is used for the parameter according to the running parameter adjustment analog to digital converter of described dispensing unit configuration;
The sampled result processing unit is used for that the data after the described analog to digital converter processing are done further processing and specifically comprises: tables look-up and linear interpolation, unit conversion, overrange detection, mark channel state, smothing filtering, 16 significance bits of intercepting and calculation check value;
Output unit is used for the data after the described sampled result processing unit processes are outputed to bus interface as a result.
Preferably, described first sensor is that temperature sensor, second sensor are pressure transducer; Described first input channel is the temperature input channel, and second input channel is the voltage/current input channel.
Described channel selecting unit is multi-way switch or switch arrays.
In sum, a kind of input and output expanded mode of the embodiment of the invention and the technology of programable controller system are put case by under the control of main control unit, the signal of input first input channel or second input channel is selected in the channel selecting unit, main control unit is that digital signal outputs to CPU via bus interface with described conversion of signals, thereby make an input and output enlargement module realize the temperature-measuring module of prior art and the function of two modules of voltage load module, reduce taking of space effectively, and reduced cost, in Operation and Maintenance, only need a module is operated, thereby improved the maintenance efficiency of system, improved system reliability.
Description of drawings
Fig. 1 is the structural drawing of existing programmable control system;
Fig. 2 is the structural representation of a kind of programable controller system of the embodiment of the invention;
Fig. 3 is the structural representation of a kind of dispensing unit of the embodiment of the invention;
Fig. 4 is the structural representation of a kind of control module of the embodiment of the invention.
Embodiment
A kind of input and output enlargement module of the embodiment of the invention and programable controller system are by under the control of main control unit, the signal of first input channel or second input channel is selected in the channel selecting unit, main control unit is that digital signal outputs to the CPU processing via bus interface with described conversion of signals, and so described expansion module has been realized the input of two kinds of signals of first input channel and second input channel.
In order further to set forth the technical scheme of the embodiment of the invention, further specify below in conjunction with accompanying drawing.
With reference to figure 2, the structural representation of a kind of programable controller system of the embodiment of the invention; According to this figure, a kind of programable controller system comprises: CPU 1, input and output enlargement module 2, first sensor (being illustrated as temperature sensor 27) and second sensor (being illustrated as pressure transducer 28), wherein, CPU 1 is connected with input and output enlargement module 2 by data bus, and input and output enlargement module 2 (shows as Fig. 2 by two first input channels, first input channel is a temperature input channel 25) be connected with two temperature sensors 27, by two second input channels (as shown in Figure 2, second input channel is a voltage/current input channel 26) be connected with two pressure transducers 28 (being specifically as follows piezoelectric transducer or pressure signal transmitter), input and output enlargement module 2 can also be connected with other module by data bus certainly.
In described system, be used for the temperature signal (specifically can represent with voltage or current signal) of temperature sensor 27 and pressure transducer 28 collections and the input and output enlargement module 2 that pressure signal (specifically can represent with voltage or current signal) sends CPU 1 to are specifically comprised:
Preferably, input and output enlargement module 2 further comprises a dispensing unit 24 (as: deploy switch or toggle switch), is used to dispose the running parameter (as: input type, fixed setting, measuring unit, the mode of connection, fault detect etc.) of described expansion module.As shown in Figure 3, dispensing unit 24 comprises: be used to import the parameter input unit 241 of described running parameter of needs configuration and the parameter storage unit 242 that is used to store described running parameter.
Wherein, main control unit 22 comprises at least:
Analog to digital converter 222, the conversion of signals that is used for 21 inputs of channel selecting unit is a digital signal, when specific implementation, analog to digital converter 222 can adopt increment accumulation (∑-Δ) type ADC, to guarantee sampling precision and antijamming capability;
Wherein, in conjunction with Fig. 4, control module 221 specifically comprises:
Sampled result processing unit 44, be used for the data after analog to digital converter 222 processing are done further processing, specifically comprise: table look-up and processing such as linear interpolation, unit conversion, overrange detection, mark channel state, smothing filtering, 16 significance bits of intercepting and calculation check value;
Preferably, in embodiments of the present invention, control module 221 can adopt one 8 microcontroller (Micro Controller Unit, MCU) realization;
Temperature sensor 27 can be the resistor-type temperature sensor, comprise negative temperature coefficient (NegativeTemperature Coefficient, NTC) thermistor and thermal resistance (Resistive Temperature Detector, RTD);
Be equipped with the passive anti-repeatedly filtering circuit that mixes in temperature input channel 25 and voltage/current input channel 26, the cutoff frequency of the anti-mixed repeatedly filtering circuit of 2 temperature input channels is different with 2 voltage/current input channels, to adapt to the unlike signal bandwidth;
In voltage/current input channel 26, also can be provided with:
Built-in sampling resistor can be converted to voltage signal in the ADC input range to current input signal;
Resistance pressure-dividing network is used for the voltage input signal of different ranges is converted to the interior voltage signal of ADC input range.
In conjunction with Fig. 2, Fig. 3, Fig. 4, elaborate the technical scheme of the embodiment of the invention.
When specific implementation, in each circulation, measure 2 voltage/current input channels, be specially:
The parameter detecting unit 41 of control module 221 detects the running parameter (as: input type, fixed setting, measuring unit, the mode of connection, fault detect etc.) that disposes in the parameter storage unit 242 of dispensing unit 24, utilize parameter adjustment unit 43 to adjust the parameter of analog to digital converter 222, comprise: select internal reference, open impact damper, select gain, set modulator frequency of operation and down-sampling frequency, select digital filter, self calibration;
The channel control unit 42 of control module 221 is according to the running parameter of configuration in the parameter storage unit 242 of dispensing unit 24, and control channel selected cell 21 is connected voltage/current input channel 26; The signal sampling of 222 pairs of voltage/current input channels of analog to digital converter 4 times is got last 1 sampled value;
Data computation voltage/current value after 44 pairs of analog to digital converters of the sampled result processing unit of control module 221 222 are handled, and carry out processing such as overrange detection, mark channel state, calculation check value, output to bus interface 23 by the data after output unit 45 will be handled as a result then, last bus interface 23 is sent to CPU 1 by data bus with described data.
Every a circulation, measure 1 temperature input channel, be specially:
The parameter detecting unit 41 of control module 221 detects the running parameter (as: input type, fixed setting, measuring unit, the mode of connection, fault detect etc.) that disposes in the parameter storage unit 242 of dispensing unit 24 (as: deploy switch or toggle switch), utilize parameter adjustment unit 43 to adjust the parameter of analog to digital converter 222, comprise: select external reference, open impact damper, select gain, set modulator frequency of operation and down-sampling frequency, select digital filter, self calibration;
The channel control unit 42 of control module 221 is according to the running parameter of configuration in the parameter storage unit 242 of dispensing unit 24 (as: deploy switch or toggle switch), and control channel selected cell 21 is connected temperature input channel 25; The signal sampling of 222 pairs of voltage/current input channels of analog to digital converter 4 times is got last 1 sampled value;
Data computation resistance value after 44 pairs of analog to digital converters of the sampled result processing unit of control module 221 222 are handled, and table look-up, interpolation, accounting temperature value, overrange detection, mark channel state, unit conversion, processing such as calculation check value; Output to bus interface 23 by the data after output unit 45 will be handled as a result then, last bus interface 23 is sent to CPU 1 by data bus with described data.
In the above-described embodiments, each circulation all will detect the configuration status of dispensing unit, promptly detects the running parameter of its configuration; Whether 1 temperature input channel of per 4 cycle detection breaks, if be configured to 3 line connections, the conductor resistance of 1 temperature input channel of then per 8 cycle detection is to eliminate its influence to measurement result.
Above-mentioned is embodiments of the invention; the invention is not restricted to this; expansion module described in the embodiment of the invention can also be integrated in the CPU module; utilize CPU to realize the function of the control module of the embodiment of the invention; can realize technical scheme of the present invention equally, also within protection scope of the present invention.
By the foregoing description as can be known, a kind of input and output expanded mode of the embodiment of the invention and the technology of programable controller system are put case by under the control of main control unit, the signal of input temp input channel or voltage/current passage is selected in the channel selecting unit, main control unit is that digital signal outputs to CPU via bus interface with described conversion of signals, thereby make a described input and output enlargement module realize the temperature-measuring module of prior art and the function of two modules of voltage load module, reduce taking of space effectively, and reduced cost, in Operation and Maintenance, only need a module is operated, thereby improved the maintenance efficiency of system, improved system reliability, in addition, embodiments of the invention use increment accumulation (∑-Δ) type ADC, have guaranteed sampling precision, have improved antijamming capability.
The above is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also are considered as protection scope of the present invention.
Claims (16)
1. an input and output enlargement module is characterized in that, comprising:
The channel selecting unit is used to select first input channel or second input channel with input signal;
Main control unit is used to control described channel selecting cell operation, and the conversion of signals that described channel selecting unit is imported is a digital signal;
Bus interface is used for the result's output after the described main control unit processing.
2. expansion module as claimed in claim 1 is characterized in that, also comprises:
Dispensing unit is used to dispose the running parameter of described expansion module.
3. expansion module as claimed in claim 2 is characterized in that, described running parameter comprises: input type, fixed setting, measuring unit, the mode of connection, fault detect.
4. expansion module as claimed in claim 2 is characterized in that, described main control unit comprises:
Analog to digital converter, the conversion of signals that is used for the input of described channel selecting unit is a digital signal;
Control module is used for according to the running parameter of described dispensing unit configuration described channel selecting unit and analog to digital converter being controlled.
5. expansion module as claimed in claim 4 is characterized in that, described control module comprises:
The parameter detecting unit is used to detect the running parameter that described dispensing unit disposes;
Channel control unit is used for controlling described channel selecting unit according to described running parameter and connects first input channel or second input channel;
The parameter adjustment unit is used for adjusting according to the running parameter of described dispensing unit configuration the parameter of described analog to digital converter;
The sampled result processing unit is used for the data after the described analog to digital converter processing are done further processing;
Output unit is used for the data after the described sampled result processing unit processes are outputed to bus interface as a result.
6. expansion module as claimed in claim 5, it is characterized in that described sampled result processing unit is done further processing to analog to digital converter processing back data and specifically comprised: table look-up and linear interpolation, unit conversion, overrange detection, mark channel state, smothing filtering, 16 significance bits of intercepting and calculation check value.
7. as any described expansion module of claim 1 to 6, it is characterized in that described first input channel is the temperature input channel, second input channel is the voltage/current input channel.
8. as any described expansion module of claim 1 to 6, it is characterized in that described channel selecting unit is multi-way switch or switch arrays.
9. programable controller system, it comprises: CPU, first sensor and second sensor, it is characterized in that, described system comprises that also one is used for the input and output enlargement module that first signal and secondary signal with the first sensor and second sensor acquisition send CPU to, and this input and output enlargement module comprises:
The channel selecting unit is connected with second sensor with first sensor respectively with second input channel by first input channel, is used to select first input channel or second input channel with input signal;
Main control unit is used to control described channel selecting cell operation, and the conversion of signals that described channel selecting unit is imported is a digital signal;
Bus interface is used for that the data after handling through described main control unit are sent to CPU and handles.
10. system as claimed in claim 9 is characterized in that, described input and output enlargement module also comprises:
Dispensing unit is used to dispose the running parameter of described expansion module.
11. system as claimed in claim 10 is characterized in that, described running parameter comprises: input type, fixed setting, measuring unit, the mode of connection, fault detect.
12. system as claimed in claim 10 is characterized in that, described main control unit comprises:
Analog to digital converter, the conversion of signals that is used for the input of described channel selecting unit is a digital signal;
Control module is used for according to the running parameter of described dispensing unit configuration described channel selecting unit and analog to digital converter being controlled.
13. system as claimed in claim 12 is characterized in that, described control module comprises:
The parameter detecting unit is used to detect the running parameter that described dispensing unit disposes;
Channel control unit is used for connecting first input channel or second input channel according to described running parameter control channel unit;
The parameter adjustment unit is used for adjusting according to the running parameter of described dispensing unit configuration the parameter of described analog to digital converter;
The sampled result processing unit is used for the data after the described analog to digital converter processing are done further processing;
Output unit is used for the data after the described sampled result processing unit processes are outputed to bus interface as a result.
14. system as claimed in claim 13, it is characterized in that described sampled result processing unit is done further processing to analog to digital converter processing back data and specifically comprised: table look-up and linear interpolation, unit conversion, overrange detection, mark channel state, smothing filtering, 16 significance bits of intercepting and calculation check value.
15. as any described system of claim 9 to 14, it is characterized in that,
Described first sensor is that the temperature sensor, second sensor that are used for detected temperatures are the pressure transducer that is used for detected pressures;
Described first input channel is the temperature input channel, and second input channel is the voltage/current input channel.
16., it is characterized in that described channel selecting unit is multi-way switch or switch arrays as any described system of claim 9 to 14.
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| CN2007100281490A CN101105691B (en) | 2007-05-23 | 2007-05-23 | Input and output enlargement module and programmable controller system |
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| CN2007100281490A CN101105691B (en) | 2007-05-23 | 2007-05-23 | Input and output enlargement module and programmable controller system |
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| CN102346454A (en) * | 2010-07-23 | 2012-02-08 | 三菱电机株式会社 | Programmable controller and bus converter |
| CN102393672A (en) * | 2011-11-11 | 2012-03-28 | 深圳市合信自动化技术有限公司 | Programmable logic controller and expansion module thereof |
| CN102445286A (en) * | 2010-09-30 | 2012-05-09 | 深圳市合信自动化技术有限公司 | Temperature measuring method and system based on programmable logic controller |
| CN102571089A (en) * | 2011-12-31 | 2012-07-11 | 北京雪迪龙科技股份有限公司 | Analog-to-digital conversion/digital-to-analog conversion self-calibration method and control system applying same |
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| EP0685798B1 (en) * | 1994-05-31 | 2003-07-16 | Advanced Micro Devices, Inc. | Interrupt controllers in symmetrical multiprocessing systems |
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| CN102445286A (en) * | 2010-09-30 | 2012-05-09 | 深圳市合信自动化技术有限公司 | Temperature measuring method and system based on programmable logic controller |
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| CN102393672A (en) * | 2011-11-11 | 2012-03-28 | 深圳市合信自动化技术有限公司 | Programmable logic controller and expansion module thereof |
| CN102571089A (en) * | 2011-12-31 | 2012-07-11 | 北京雪迪龙科技股份有限公司 | Analog-to-digital conversion/digital-to-analog conversion self-calibration method and control system applying same |
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Address after: 518052 Guangdong city of Shenzhen province Nanshan District Xili town tea light road on the south side of Shenzhen integrated circuit design and application of Industrial Park 209 Patentee after: CO-TRUST Technologies Co., Ltd. Address before: 518052 room 1008, Nanshan Software Park, Shennan Road, Shenzhen, Nanshan District, Guangdong Patentee before: CO-TRUST Technologies Co., Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101201 Termination date: 20180523 |
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| CF01 | Termination of patent right due to non-payment of annual fee |