CN108490842B - A kind of dynamic diagnostic device and method of multichannel ADC crosstalk - Google Patents
A kind of dynamic diagnostic device and method of multichannel ADC crosstalk Download PDFInfo
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- CN108490842B CN108490842B CN201810421194.0A CN201810421194A CN108490842B CN 108490842 B CN108490842 B CN 108490842B CN 201810421194 A CN201810421194 A CN 201810421194A CN 108490842 B CN108490842 B CN 108490842B
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- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
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- G—PHYSICS
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Abstract
The invention discloses the dynamic diagnostic devices and method of a kind of multichannel ADC crosstalk, device includes data processing unit, the ADC has M input channel, M is the natural number not less than 2, the output signal of ADC is sent to data processing unit, each channel is by an input control switch access input signal, and each channel also passes through a ground connection control switch and is connected to ground and accesses reference voltage by a reference voltage control switch.The present invention can be with the crosstalk between quick diagnosis multichannel ADC, it can complete crosstalk diagnosis and channel normal acquisition function between ADC channel in one cycle simultaneously, to reach the real-time of diagnosis and the reliability of data acquisition, the Acquisition Circuit for designing high diagnosis coverage rate is supported.
Description
Technical field
The present invention relates to data acquisition technology fields, and in particular to a kind of dynamic diagnostic device of multichannel ADC crosstalk and
Method.
Background technique
In industrial control field, instrument control field especially is digitized in nuclear power plant, a large amount of analog output is will use and passes
Sensor, therefore simultaneously real-time monitoring can be acquired to a large amount of analog signals by control system.
Nuclear power field is one to the extra high field of safety and reliability requirement, therefore acquisition system must assure that peace
Quan Xing, high reliability.
It is acquired for a large amount of analog signals, it will usually use multichannel ADC Acquisition Circuit, and be gone here and there between multichannel ADC
Disturbing is an easy problem, in the event of multichannel crosstalk and be unaware of, then the data that may cause acquisition are inaccurate
Really and have no idea to find serious problems occur so as to cause the use of follow-up data, the control of equipment.Therefore, in order to ensure that mould
The correctness and safety of analog quantity signal acquisition carry out diagnosis to the interchannel crosstalk of acquisition channel and alarm are necessary.
Summary of the invention
The purpose of the present invention is to provide a kind of dynamic diagnostic devices of multichannel ADC crosstalk, examine acquisition channel
It is disconnected, the cross-interference issue of interchannel when multichannel ADC acquisition analog signals is found in time, and analog data high reliability is supported to adopt
The realization of collection.The present invention also provides a kind of dynamic diagnosis methods of multichannel ADC crosstalk.
The present invention is achieved through the following technical solutions:
A kind of dynamic diagnostic device of multichannel ADC crosstalk, including data processing unit, the ADC have M input logical
Road, M are the natural number not less than 2, and the output signal of ADC is sent to data processing unit, which is characterized in that each channel passes through
One input control switch access input signal, and each channel also passes through a ground connection control switch and is connected to ground and by one
A reference voltage control switch accesses reference voltage.Dynamic diagnostic device of the invention can be between quick diagnosis multichannel ADC
Crosstalk, support data acquisition reliable realization.
Further, input control switch, reference voltage control switch and ground connection control switch with data processing list
Member is connected, and by data processing unit control input control switch, reference voltage control switch and the state for being grounded control switch, opens
The state of pass includes disconnecting and being closed 2 kinds of states.
As a further improvement of the present invention, the corresponding code presupposition of switch state is stored in the data processing unit
Value；The code value that the data processing unit is also used to compare in dynamic diagnosis under current switch states after ADC conversion is opened with this
Whether the corresponding default code value of off status is consistent, and there are crosstalk or ADC Acquisition Errors if inconsistent, exports fault message mark
Know.
As another improvement of the invention, when dynamic diagnosis, under the control of data processing unit, the benchmark of adjacency channel
Voltage cut-out is with ground connection control switch interval closure and each input channel only accesses a kind of switch.So set, for
Crosstalk diagnosis is most accurate.
Preferably, the input control switch, reference voltage control switch and ground connection control switch are all made of and are switched fast
Switch.
Further, also it is connected by digital isolator between the ADC and CPU, the digital isolator is for carrying out ADC
Bus isolation between CPU.
Further, the data processing unit further includes or is connected with alarm module, for be diagnosed to be crosstalk it
Alert afterwards.
A kind of dynamic diagnosis method of multichannel ADC crosstalk, using the above scheme in any multichannel ADC crosstalk it is dynamic
State diagnostic device is diagnosed, specifically includes the following steps:
The default test code value of S1: the test code value A2 of test the code value A1 and ground connection of setting ADC access reference voltage；
S2 dynamic diagnosis: when dynamic diagnosis, input control switch is disconnected, the reference voltage control switch of adjacency channel and is connect
Ground control switch interval is closed and each channel only has access a kind of switch；
S3 crosstalk determines: comparing the code value code presupposition corresponding with channel switch state under step S2 state after ADC conversion
Whether value is consistent, and crosstalk or ADC Acquisition Error are not present if consistent, and there are crosstalks or ADC acquisition to miss if inconsistent
Difference.
Further, the data processing unit is also connected with alarm module, in step S3 when comparing dynamic diagnosis, ADC
When code value after conversion default code value corresponding with channel switch state is inconsistent, alarm module also exports warning message.
Further, also there is the 2nd dynamic diagnosis step after step S3, specifically includes the following steps:
S4 switches switch state: keeping input control switch to be in an off state, switches reference voltage control switch and connect
The state of ground control switch；
Bis- crosstalks of S5 determine: the code value compared under step S4 state after ADC conversion is corresponding with channel switch state pre-
If whether code value is consistent, crosstalk or ADC Acquisition Error are not present if consistent, there are crosstalks or ADC to adopt if inconsistent
Collect error.
Preferably, the test code value A1 of ADC access reference voltage is set as complete 1 in step S1, the survey that ADC is grounded
Examination code value A2 is set as full 0.
Compared with prior art, the present invention having the following advantages and benefits:
1, the dynamic diagnostic device and method of a kind of multichannel ADC crosstalk of the present invention can diagnose acquisition channel,
The cross-interference issue of interchannel when discovery multichannel ADC acquires analog signals in time, supports the acquisition of analog data high reliability
Realization.
2, the dynamic diagnostic device and method of a kind of multichannel ADC crosstalk of the present invention can be applied to npp safety grade number
Change I&C system or other industrial control industries are realized and acquired to the high reliability of voltage signal or current signal.
3, a cycle that the dynamic diagnostic device and method of a kind of multichannel ADC crosstalk of the present invention can be run in CPU
Inside it is completed at the same time signal acquisition and dynamic diagnosis, it is ensured that will not influence the acquisition of signal while diagnosis.
Detailed description of the invention
Attached drawing described herein is used to provide to further understand the embodiment of the present invention, constitutes one of the application
Point, do not constitute the restriction to the embodiment of the present invention.In the accompanying drawings:
Fig. 1 is the structural schematic diagram of the dynamic diagnostic device of one embodiment of the present of invention.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below with reference to embodiment and attached drawing, to this
Invention is described in further detail, and exemplary embodiment of the invention and its explanation for explaining only the invention, are not made
For limitation of the invention.
In the following description, a large amount of specific details are elaborated in order to provide a thorough understanding of the present invention.However, for this
Field those of ordinary skill it is evident that: the present invention need not be carried out using these specific details.In other instances, it is
The present invention that avoids confusion, does not specifically describe well known structure, circuit, material or method.
Throughout the specification, meaning is referred to " one embodiment ", " embodiment ", " example " or " example "
: a particular feature, structure, or characteristic described in conjunction with this embodiment or example is comprised at least one embodiment of the invention.
Therefore, the phrase " one embodiment " in each place appearance of the whole instruction, " embodiment ", " example " or " example "
It is not necessarily all referring to the same embodiment or example.Furthermore, it is possible in any suitable combination and or sub-portfolio by specific feature,
Structure or characteristic combines in one or more embodiment or examples.In addition, it should be understood by one skilled in the art that herein
The diagram of offer is provided to the purpose of explanation, and diagram is not necessarily drawn to scale.Term used herein " and/
Or " include the project that one or more correlations are listed any and all combinations.
Embodiment 1
As shown in Figure 1, a kind of dynamic diagnostic device of multichannel ADC crosstalk, including data processing unit, the ADC tool
There are 8 input channel IN1~IN8 (the 1st input channel IN1 and the 8th input channel IN8 is merely illustrated in figure), Mei Getong
Road by input control switch access input signal, and each channel also pass through a ground connection control switch be connected to and
Reference voltage is accessed by a reference voltage control switch, the output signal of ADC is sent to data processing unit by bus,
Also it is connected by digital isolator between ADC and CPU, digital isolator is used to carry out the Bus isolation between ADC and CPU；Institute
State input control switch, reference voltage control switch and ground connection control switch (hereinafter referred to as " channel switch ") and data processing
Unit is connected, and the state of these channel switch is controlled by data processing unit.Data processing unit uses CPU in the present embodiment.
The state of switch includes disconnecting and being closed 2 kinds of states, the corresponding default code value of switch state is stored in CPU, in dynamic diagnosis
When, whether the code value default code value corresponding with the switch state that CPU is also compared under current switch states after ADC conversion is consistent,
There are crosstalk or ADC Acquisition Errors if inconsistent, export fault message mark.Fault message mark can be 0 or 1,
Simply identify whether that there are failures.
In other embodiments, input control switch, reference voltage control switch and ground connection control switch can also be with
It is connected in an independent control module, which is connected with CPU again.
Above-mentioned ADC has 8 input channels, it is corresponding have 8 input control switch SW1, SW2, SW3, SW4, SW5,
SW6, SW7, SW8 (hereinafter abbreviated as SW1~SW8), are respectively connected to input signal；Equally, reference voltage control switch also has 8
Respectively D_SW1, D_SW2, D_SW3, D_SW4, D_SW5, D_SW6, D_SW7, D_SW8 (hereinafter abbreviated as D_SW1~D_
SW8)；It is respectively D_SW11, D_SW22, D_SW33, D_SW44, D_SW55, D_SW66, D_ that ground connection control switch, which also has 8,
SW77, D_SW88 (hereinafter abbreviated as D_SW11~D_SW88).It input control above-mentioned switch, reference voltage control switch and connects
Ground control switch should use disconnecting switch instead.Reference voltage control switch and ground connection control switch constitute dynamic diagnosis access.It can
To find out, the dynamic diagnostic device of the present embodiment actually includes following part:
(1) normal acquisition signal path
It is made of ADC and digital isolator, current signal or voltage signal can be acquired, signal is after ADC is converted, by total
The mode of line is uploaded to CPU and is handled.Digital isolator mainly realizes the isolation of bus, meets channel to isolation of system pressure resistance
Requirement.
(2) dynamic switch switching circuit
In control field of nuclear, on-site signal and system control signal should ensure that the resistance to pressure request of certain isolation, therefore answer
Select disconnecting switch, such as Photomos photoelectric isolating device.
Disconnecting switch working condition is as follows:
When normal acquisition, SW1~SW8 is closed the switch, and input signal accesses normal acquisition signal path；Disconnect switch D_
SW1~D_SW8 and D_SW11~D_SW88 cuts off dynamic diagnosis access.
When dynamic diagnosis: disconnecting SW1~SW8, cut off normal acquisition signal path, closing or opening D_ as needed
SW1~D_SW8, D_SW11~D_SW88 open dynamic diagnosis access.
Disconnecting switch is to be switched fast switch, it is ensured that realizes that normal acquisition and dynamic are examined in a collection period
It is disconnected.
(3) CPU processing circuit
CPU handles the data of ADC acquisition, judges that interchannel whether there is crosstalk, and control disconnecting switch and normally adopted
Collection, dynamic diagnosis；CPU can also be connected or including alarm module, and the processing such as execute police instruction.
The dynamic diagnostic device of multichannel ADC crosstalk in the present embodiment can be in a cycle that CPU is run simultaneously
Complete signal acquisition and dynamic diagnosis, it is ensured that will not influence the acquisition of signal while diagnosis.
ADC is multichannel, and the present embodiment is designed as the cross-interference issue between diagnosis multichannel ADC, can be reduced to ADC hand over word
Crosstalk between value.
Multichannel ADC adjacency channel passes through disconnecting switch respectively and hales ADC reference voltage and ground, if 12 ADC hand over words
Value is respectively 111111111111 and 000000000000, once there is crosstalk, code value will change, and be judged by CPU
Failure, and execute fault alarm.
After dynamic diagnosis, switch state restores confirmation, to distinguish input signal and diagnostic signal, it is necessary to diagnosis be allowed to believe
Number and input signal not in same range.
Preferably, when dynamic diagnosis, CPU controls reference voltage control switch and the ground connection control switch interval of adjacency channel
Closure and each input channel only accesses a kind of switch, the code value in two adjacent in this way channels be exactly 0 and 1 staggeredly, and 0 He
1 most easily produces crosstalk, and setting in this way diagnoses crosstalk most accurate.
The present embodiment also provides a kind of dynamic diagnosis method of multichannel ADC crosstalk, more using one of the present embodiment
The dynamic diagnostic device of channel ADC crosstalk is diagnosed, specifically includes the following steps:
The default test code value of S1: the test code value A2 of test the code value A1 and ground connection of setting ADC access reference voltage；Specifically
The test code value A1 of ADC access reference voltage is set as complete 1, the ADC test code value A2 being grounded is set as full 0, example by ground
Such as, the test code value A2 that the ADC that the test code value A1 of 12 ADC access reference voltages is 111111111111,12 is grounded
It is 00000000000；Inventor has found in long-term research process, is most easy crosstalk between full code value and low level, therefore
When setting test code value, manufacture allows ADC to expire the reference voltage signal and low level signal of code value, and ADC is accessed reference voltage
Test code value A1's is set as complete 1, and the ADC test code value A2 being grounded is set as full 0.
S2 dynamic diagnosis: when dynamic diagnosis, input control switch is disconnected, the reference voltage control switch of adjacency channel and is connect
Ground control switch interval is closed and each channel only has access a kind of switch；Channel switch state includes disconnecting and being closed 2 kinds of shapes
State, the reference voltage control switch and ground connection control switch interval closure of above-mentioned adjacency channel refer to: the benchmark of adjacency channel
The state of voltage cut-out is different, and the state of the ground connection control switch of adjacency channel is different, and each channel only has access
A kind of switch；Such as the reference voltage control switch in radix channel is closed and is grounded control switch disconnection, the benchmark of even-numbered channels
Voltage cut-out disconnects and is grounded control switch closure, and vice versa.In the case where no crosstalk, channel switch state with
Default code value is corresponding, the code value and test code value A1 if channel connects benchmark voltage cut-out, after ADC conversion
Unanimously, if channel connection ground connection control switch, the code value after ADC conversion are consistent with test code value A2；It can sentence accordingly
It is disconnected to whether there is crosstalk；
S3 crosstalk determines: comparing the code value code presupposition corresponding with channel switch state under step S2 state after ADC conversion
Whether value is consistent, and crosstalk or ADC Acquisition Error are not present if consistent, and there are crosstalks or ADC acquisition to miss if inconsistent
Difference.
Further, in step S3 when comparing dynamic diagnosis, the code value after ADC conversion is corresponding with channel switch state
When default code value is inconsistent, alarm module also exports warning message.
Further, it is positive and makes a definite diagnosis the cross-interference issue of disconnected interchannel, according to the environment principle of easy crosstalk, can carry out twice
Dynamic diagnosis, the diagnosis can be completed successively within two periods, it may be assumed that also there is the 2nd dynamic diagnosis step after step S3,
Specifically includes the following steps:
S4 switches switch state: keeping input control switch to be in an off state, switches reference voltage control switch and connect
The state of ground control switch；
Bis- crosstalks of S5 determine: the code value compared under step S4 state after ADC conversion is corresponding with channel switch state pre-
If whether code value is consistent, crosstalk or ADC Acquisition Error are not present if consistent, there are crosstalks or ADC to adopt if inconsistent
Collect error.
1 pair of this method is further described with reference to the accompanying drawing:
When the voltage or current signal in the channel normal acquisition IN1-IN8, switch SW1~SW8 closure, D_SW1~D_SW8,
D_SW11~D_SW88 is disconnected, and input signal reaches CPU after ADC is converted, through bus, and is handled by CPU.
When first time dynamic diagnosis, SW1~SW8 is disconnected, D_SW1, D_SW22, D_SW3, D_SW44, D_SW5, D_
SW66, D_SW7, D_SW88 closure, 12 ADC convert after code value will into 111111111111,000,000,000 00,
111111111111,00000000000,111111111111,00000000000,111111111111,00000000000, point
Reference voltage and 0 level (level when ground connection) are not corresponded to, if having crosstalk or ADC Acquisition Error between ADC channel, after conversion
Code value and above-mentioned inconsistent, there are crosstalk or ADC Acquisition Error, CPU will identify this failure.
When second of dynamic diagnosis, SW1~SW8 is disconnected, D_SW11, D_SW2, D_SW33, D_SW4, D_SW55, D_
SW6, D_SW77, D_SW8 closure, 12 ADC convert after code value will into 00000000000,11,111,111,111 1,
00000000000,111111111111,00000000000,111111111111,00000000000,111111111111, point
Not Dui Ying 0 level, reference voltage, if having crosstalk or ADC Acquisition Error between ADC channel, conversion after code value and it is above-mentioned not
It is consistent then there are crosstalk or ADC Acquisition Error, CPU will identify this failure.
The dynamic diagnostic device and method of multichannel ADC crosstalk are applied to analog signals Acquisition Circuit in the present embodiment,
Can be with the crosstalk between quick diagnosis multichannel ADC, while analog input channel is diagnosed, it can also be in a week
Phase interior crosstalk diagnosis and channel normal acquisition function between completing ADC channel support data acquisition to reach the real-time of diagnosis
Reliable realization designs the Acquisition Circuit of high diagnosis coverage rate, can be applied to the digitalized I&C system of npp safety or work
Other control industries of industry are supported to acquire the high reliability of voltage signal or current signal.The dynamic diagnostic device of the present embodiment exists
It was found that channel is built there are that after crosstalk, can carry out further adjusting and optimizing in terms of program, reduce crosstalk, this is not belonging to this hair
Bright technical problems to be solved repeat no more in the present embodiment.
In actual use, if ADC prime is 4mA-20mA current signal, prime can be designed and is converted to by differential signal
Then the circuit of single-ended signal is input to ADC prime again, realize the acquisition function to signal.If prime is 0~10V voltage
Signal can realize the acquisition of single ended signal directly altogether, and achieve the purpose that dynamic diagnosis and crosstalk diagnosis.
The mode of dynamic diagnosis can according to Calculation of Reliability, by the software flexible configuration diagnostics time, can with real-time diagnosis,
Also it is configurable to 8 hours or other times diagnosis is primary.
Above-described specific embodiment has carried out further the purpose of the present invention, technical scheme and beneficial effects
It is described in detail, it should be understood that being not intended to limit the present invention the foregoing is merely a specific embodiment of the invention
Protection scope, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should all include
Within protection scope of the present invention.
Claims (8)
1. a kind of dynamic diagnostic device of multichannel ADC crosstalk, including data processing unit, the ADC has M input logical
Road, M are the natural number not less than 2, and the output signal of ADC is sent to data processing unit, which is characterized in that each channel passes through
One input control switch access input signal, and each channel also passes through a ground connection control switch and is connected to ground and by one
A reference voltage control switch accesses reference voltage；
The input control switch, reference voltage control switch and ground connection control switch are connected with data processing unit, described
Data processing unit controls input control switch, reference voltage control switch and the state for being grounded control switch, the state of switch
Including disconnecting and being closed 2 kinds of states；
The corresponding default code value of switch state is stored in the data processing unit；The data processing unit is also used to dynamic
Whether the code value default code value corresponding with the switch state compared under current switch states after ADC conversion when state diagnoses is consistent,
There are crosstalk or ADC Acquisition Errors if inconsistent, export fault message mark.
2. a kind of dynamic diagnostic device of multichannel ADC crosstalk according to claim 1, which is characterized in that dynamic diagnosis
When, the data processing unit also controls the reference voltage control switch and ground connection control switch interval closure and every of adjacency channel
A input channel only accesses a kind of switch.
3. a kind of dynamic diagnostic device of multichannel ADC crosstalk according to any one of claims 1 to 2, which is characterized in that institute
Data processing unit is stated using CPU, is also connected by digital isolator between the ADC and CPU, the digital isolator is used for
Carry out the Bus isolation between ADC and CPU.
4. a kind of dynamic diagnostic device of multichannel ADC crosstalk according to any one of claims 1 to 2, which is characterized in that institute
It states data processing unit to further include or be connected with alarm module, for the alert after being diagnosed to be crosstalk.
5. a kind of dynamic diagnosis method of multichannel ADC crosstalk, which is characterized in that using any described in claim 1-4
A kind of dynamic diagnostic device of multichannel ADC crosstalk is diagnosed, specifically includes the following steps:
The default test code value of S1: the test code value A2 of test the code value A1 and ground connection of setting ADC access reference voltage；
S2 dynamic diagnosis: when dynamic diagnosis, input control switch, the reference voltage control switch and ground connection control of adjacency channel are disconnected
Switch gap processed is closed and each channel only has access a kind of switch；
S3 crosstalk determines: comparing the code value default code value corresponding with channel switch state under step S2 state after ADC conversion is
It is no consistent, crosstalk or ADC Acquisition Error are not present if consistent, there are crosstalk or ADC Acquisition Errors if inconsistent.
6. a kind of dynamic diagnosis method of multichannel ADC crosstalk according to claim 5, which is characterized in that the data
Processing unit is also connected with alarm module, the code value and channel switch shape in step S3 when comparing dynamic diagnosis, after ADC conversion
When the corresponding default code value of state is inconsistent, alarm module also exports warning message.
7. a kind of dynamic diagnosis method of multichannel ADC crosstalk according to claim 5 or 6, which is characterized in that step S3
Also there is the 2nd dynamic diagnosis step later, specifically includes the following steps:
S4 switches switch state: keeping input control switch to be in an off state, switching reference voltage control switch and ground connection control
Make the state of switch；
Bis- crosstalks of S5 determine: comparing the code value code presupposition corresponding with channel switch state under step S4 state after ADC conversion
Whether value is consistent, and crosstalk or ADC Acquisition Error are not present if consistent, and there are crosstalks or ADC acquisition to miss if inconsistent
Difference.
8. a kind of dynamic diagnosis method of multichannel ADC crosstalk according to claim 5 or 6, which is characterized in that step S1
The middle test code value A1's by ADC access reference voltage is set as complete 1, and the ADC test code value A2 being grounded is set as full 0.
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Effective date of registration: 20201218 Address after: No.3, Hongda South Road, Beijing Economic and Technological Development Zone, Daxing District, Beijing Patentee after: CHINA NUCLEAR CONTROL SYSTEM ENGINEERING Co.,Ltd. Address before: 610000, No. three, 28 south section of Ring Road, Chengdu, Sichuan Patentee before: NUCLEAR POWER INSTITUTE OF CHINA |