CN107436584B - A kind of immunity experiment quantification evaluating method of programmable controller - Google Patents
A kind of immunity experiment quantification evaluating method of programmable controller Download PDFInfo
- Publication number
- CN107436584B CN107436584B CN201710483152.5A CN201710483152A CN107436584B CN 107436584 B CN107436584 B CN 107436584B CN 201710483152 A CN201710483152 A CN 201710483152A CN 107436584 B CN107436584 B CN 107436584B
- Authority
- CN
- China
- Prior art keywords
- pulse
- plc
- counting
- test
- interference
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- 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
- G05B19/05—Programmable logic controllers, e.g. simulating logic interconnections of signals according to ladder diagrams or function charts
- G05B19/058—Safety, monitoring
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- 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
- G05B19/048—Monitoring; Safety
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/10—Plc systems
- G05B2219/14—Plc safety
- G05B2219/14097—Display of error messages
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Programmable Controllers (AREA)
- Testing Electric Properties And Detecting Electric Faults (AREA)
Abstract
The present invention provides a kind of immunity experiment quantification evaluating methods of programmable controller, which comprises the following steps: step 1 builds immunity experiment quantification evaluating apparatus；Step 2, by accompany test product generate frequency be XHz high-speed counting pulse and counting direction signal, it is counted by the high-speed counting pulse input end that capacitive coupling folder is connected to test item, in the process, the interference signal that disturbing pulse generator generates is injected into tested device power supply output line, or is pressed from both sides by capacitive coupling and the interference signal that disturbing pulse generator generates is coupled on high-speed counting pulse signal-line；Step 3 calculates the ratio that bursts of error number in a code test runing time accounts for tale umber of pulse.The method provided through the invention can guarantee and determine more efficientization to the test result of the anti-interference ability of the interference signal of PLC, can quantify and high accuracy.
Description
Technical field
A kind of immunity experiment quantification evaluating method of programmable controller of the present invention belongs to electronic measurement technique neck
Domain.
Background technique
Existing programmable controller (abbreviation PLC), the especially PLC with SERVO CONTROL function, its input and output connect
Mouth needs to send and receive high-speed pulse, and accurately sends or receives the basic demand that pulse is PLC, however in actual environment
In due to external electromagnetic interference presence, often will affect the operation of PLC, may cause PLC program error or fault when serious
It shuts down, but more common problem is to cause the program of PLC that can still operate normally, and power supply or signal are caused waveform by external disturbance
Distortion, it is easy to pulse be caused to send or receive the other mistake of appearance.IEC EMC test method is generally used now
(including electrical fast transient (eft) immunity to interference, surge (impact) immunity to interference, conduction interference immunity to interference, radiation immunity) examination produces
The Electro Magnetic Compatibility of product.As electrical fast transient (eft) immunity to interference (abbreviation EFT) test follows national standard GB_T 17626.4-
2008/ international standard IEC 61000-4-4, if Fig. 1 is electrical fast transient (eft) immunity experiment block diagram, this test method
In, its working condition is intuitively observed in the case where being interfered by EFT for tested PLC product and whether function is normal.
IEC standard is not specified by the program that PLC product is run in test, and how to assert the method for " function is normal ",
Conventional test methods are one simple application programs of operation, as long as PLC is able to maintain in test " RUN " state and (does not occur event
Barrier is shut down) think " function is normal ".As shown in Figure 1, for existing traditional programmable controller (abbreviation PLC) electricity quick wink
Become impulse train immunity to interference (abbreviation EFT) testing standard, national standard follows GB_T 17626.4-2008/ international standard and follows IEC
In this test method of 61000-4-4., when PLC by EFT in the case where being interfered, intuitively to observe its function, working condition
It whether is normally the standard of judgement, to qualitatively determine whether to test by the anti-interference of appropriate level.
But practical experience shows that PLC when receiving external electromagnetic interference from small to large, an other counting often first occurs
Or mistake is calculated, then incorrect frequency is stepped up, and finally just will appear disorderly closedown.
Summary of the invention
The purpose of the present invention enables the evaluation to PLC anti-interference ability to quantify.
In order to achieve the above object, the technical solution of the present invention is to provide a kind of immunity experiments of programmable controller
Quantification evaluating method, which comprises the following steps:
Step 1 builds immunity experiment quantification evaluating apparatus, including disturbing pulse generator and two PLC, and one
PLC is as test item, and in addition a PLC is as test product is accompanied, and the power input of disturbing pulse generator is via tested device electricity
Source input line connects external power supply one, and the power output end of disturbing pulse generator connects quilt via tested device power supply output line
PLC power supply interface is tried, the power input of subject PLC power supply interface connection test item is connected with individual external power supply two
Accompany the pulse transmitting terminal of test product defeated via the high-speed counting pulse of capacitive coupling folder and high-speed counting pulse signal-line and test item
Entering end to be connected, the signal output end of disturbing pulse generator is connected to capacitive coupling folder via disturbing pulse group's coaxial output line,
Disturbing pulse generator is powered by external power supply two；
Step 2, by accompany test product generate frequency be XHz high-speed counting pulse and counting direction signal, pass through capacitive coupling
The high-speed counting pulse input end that folder is connected to test item is counted, and in the process, disturbing pulse generator is generated
Interference signal is injected into tested device power supply output line, or is done by capacitive coupling folder by what disturbing pulse generator generated
It disturbs signal to be coupled on high-speed counting pulse signal-line, each counting period, accompanies test product first to send counting forward pulse Y, stop
Whether the umber of pulse only counted after Z seconds by test item inspection is equal to Y, while according to being few meter or more meters respectively by the number of error
It is cumulative to be saved in error number register, by counter O reset after the completion of relatively, then start counting in reverse after being delayed, accompanies test product
Start to suspend after sending Y counting in reverse pulse, it is whether wrong by test item counting in reverse and verification, by error number and error number
It is saved after original error number is cumulative in register；
Step 3 calculates the ratio that bursts of error number in a code test runing time accounts for tale umber of pulse, in which:
Bursts of error number is the error number by error number register read；
If a code test runing time is Ws, then tale umber of pulse=2* [W/ (Z+2*Y/X)] * Y, in formula,
[] is rounding operation symbol.
For the PLC product with servo function, need to move to by transmission driving pulse control servo unit specified
Position, or receive the physical location of the pulse measure control object of position sensor, PLC processing unit and these high rapid pulses
It is extremely susceptible to electromagnetic interferences to rush input/output interface, malfunction is generated, thus in high-speed pulse input and output segment count
The errors number and extent of error of appearance can be used as an evaluation index for investigating this PLC anti-interference ability.
Based on this, the present invention is in the communication process that programmable controller receives high-speed counting pulse signal, to subject PLC
Apply interference signal, statistics programmable controller receives the number of errors of high-speed counting pulse, calculates error rate, programmable
It is straight that direct corresponding relationship, the size of error rate one by one are established between the communication error rate of controller and the accuracy of its immunity to interference
Connect the anti-interference ability for showing PLC interference signal.By this method, it can guarantee the anti-interference energy to the interference signal of PLC
The test result of power determines more efficientization, can quantify and high accuracy.
The invention has the benefit that
1) the immunity experiment quantification evaluating method of programmable controller of the present invention is easily achieved, test dress
It is simple to set structure, strong operability.
2) method provided through the invention, can guarantee more specificization is determined to the test result of the immunity to interference of PLC, can
Quantification and accurate.
3) a kind of new effective, reliable and accurate anti-interference examination is provided for the application of PLC, especially PLC servo applications
Test can quantification wire examination method.With apparent technology novelty, advance and practicability.
Detailed description of the invention
Fig. 1 electrical fast transient (eft) immunity experiment block diagram；
Fig. 2 electrical fast transient (eft) immunity experiment block diagram involved in the present invention；
The transmitting-receiving period of high-speed counting pulse of Fig. 3；
Impulse waveform before Fig. 4 does not take impulse train interference suppression measure, when step-by-step counting error rate is higher；
Impulse waveform after Fig. 5 takes impulse train interference suppression measure, when step-by-step counting error rate is lower.
Specific embodiment
Below by taking electrical fast transient (eft) immunity experiment as an example, in conjunction with attached drawing, the invention will be further described, gives
Specific embodiment out.
There are two PLC in the present invention, a conduct accompanies test product to send high-speed counting pulse, and in addition a PLC is as subject
Product receive high-speed counting pulse, and statistics subject PLC counts the height received in the case where being interfered by electrical fast transient (eft)
The error number of fast counting pulse signal；Cumulative error number is stored in subject PLC register, after EFT interference stops, by calculating
Machine and subject PLC pass through RS232 serial communication and read the error number of high-speed counting pulse communication, can be fast according to error number
Speed accurately and efficiently calculates error rate, and the error rate the big, and the influence for illustrating that subject PLC is interfered by EFT is bigger, anti-EFT
Interference performance is poorer；Conversely, error rate is smaller, the influence for illustrating that subject PLC is interfered by EFT is smaller, anti-EFT interference performance
It is stronger.The rapid pulse that can use tricks rushes the size of error rate to measure the influence size that PLC is interfered by EFT.
In conjunction with Fig. 2, method to realize the present invention, the composition dress for the electrical fast transient (eft) interference test for needing to build
It sets and includes: electrical fast transient burst generator (including coupling/decoupling network), capacitive coupling folder, high-speed counting pulse hair
Programmable controller (accompanying examination PLC), high-speed counting pulse is sent to receive programmable controller (subject PLC), isolating transformer and meter
Calculation machine.Wherein there is 220V AC power source supply EFT generator all the way and accompany examination PLC work, in addition 220V AC power source is then all the way
It is followed by by isolating transformer to tested device power input, using coupling/decoupling network inside EFT, is set from subject
Standby working power output end is output to tested device power outlet.The transmission of high-speed pulse can be all used in actual servo applications
And reception needs to be tested to keep independence of the subject PLC by electric fast transient fast pulse interference train in the present invention
PLC and accompany examination PLC separately power, subject PLC working power is obtained at tested device power outlet (injected pulse group interference).
Examination PLC is accompanied then to take electricity from standard AC power supply.The pulse coaxial output line connection capacitive coupling folder of EFT generator carries out signal
Line interference test.The high-speed counting step-by-step counting input terminal of subject PLC accompanies the high-speed counting of examination PLC by the connection of signal of communication line
Pulse output end, subject PLC are received from the high-speed counting pulse for accompanying examination PLC.Computer by RS232 serial ports end be connected to by
Try PLC.
Since EFT test is there are two types of applying mode is interfered, one is electrical fast transient (eft) interference is injected into subject
In equipment power supply line, another is by coupling clip by electrical fast transient (eft) interference and coupling to tested device signal of communication
On line.The present invention contains both different test methods, and the test method is all same to two different conflicting modes
Sample is applicable in.There are two types of pulses in the present invention, and one is electrical fast transient (eft)s, belong to disturbing pulse group；Another is high
Speed counts pulse, belongs to disturbed pulse.(note: due to having decoupling network inside electrical fast transient (eft) interferance generator,
And the uncertain factor of test product, micro leakage current may be generated on circuit, thus in group pulse generator test item electricity
Install the isolating transformer to match with instrument before the input terminal of source additional).
Method provided by the invention works out an application for according to the high speed position pulse output function of subject PLC product
Program, by accompanying examination PLC (under noiseless environment) to generate stated number with specified frequency (close to product highest output frequency)
Purpose forward and reverse counts output pulse (should apply simultaneously test program in multiple channels according to the function of product), by being tested
PLC (under the interference environment) is received, the counting direction that subject PLC should press transmitting terminal instruct accurate count pick up (rise or
Decline counts), it continuously transmits and receives in test time, and the miscount number by occurring judges PLC to electricity
The adaptability of magnetic environment, and with opposite quantitative instruction.It is tested due to this and is related to the power supply of PLC, CPU arithmetic section,
Input interface, output interface and power input line, the parts such as input/output interface line can compare comprehensive assessment PLC product and answer
Use environmental condition.The specific implementation process of method provided by the invention are as follows:
It is X (Hz) high-speed counting pulse and counting direction signal by accompanying examination PLC to generate frequency, is pressed from both sides and connected by capacitive coupling
High-speed counting pulse input end to subject PLC is counted.Each counting period accompanies examination PLC first to send counting forward pulse Y
It is a, check whether the umber of pulse counted is equal to Y, while root by subject PLC after stopping Z seconds (this value can adjust as the case may be)
According to being that few meter or more meters are saved in error number register for the number of error is cumulative respectively.It is after the completion of relatively that counter is clear
Zero, then start counting in reverse after being delayed, accompany examination PLC to start to suspend after sending Y counting in reverse pulse, it is reversed by subject PLC
It counts and whether verification is wrong, error number is stored in register.This is so to recycle in a counting period, the work shape of counter
State is as shown in Figure 3.
Since the frequency of high-speed counting pulse is X (Hz), holding time is Y/X (second) in total for Y counting forward pulse, together
Holding time is also Y/X (s) to Y counting in reverse pulse of reason in total, stops Zs after counting forward and is judged and saved mistake
Accidentally number, so the time (a communication count period) that complete high-speed counting pulse transmitting-receiving occupies in total is Y/X+Z+Y/
X=Z+2*Y/X (s).The EFT test run time of standard is 60s, and during an EFT is tested, two PLC are a certain
It is that 60/ (Z+2*Y/X) is a that transceiving high speed, which counts the periodicity of pulse, in a channel, can carry out rounding operation to number of cycles,
The positive high-speed counting pulse of transmitting-receiving [60/ (Z+2*Y/X)] * Y and [60/ (Z+2*Y/X)] * Y reversed high-speed counting arteries and veins in total
Punching, total umber of pulse are 2* [60/ (Z+2*Y/X)] * Y.
It is exemplified below, is 90KHZ in certain test high speed counting pulse frequency, each counting period accompanies examination PLC
Send counting forward pulse 850,000.Stop 1.2s after transmission.As a result measure, be tested the input channel of PLC by
In the case that 2KV fast-pulse group is to power supply disturbance, reversed high-speed counting umber of pulse has lacked 2604, positive high-speed counting pulse
7079, before not taking interference suppression measure have been counted mostly, figure is shown in by the high-speed counting impulse waveform that electrical fast transient (eft) interferes
4, burst errors number in total is 2604+7079=9683, and bursts of error number accounts for the ratio of overall pulse number are as follows: bursts of error number/
Overall pulse number * 100%, 9683/ { [2*60/ (1.2+2*850000/90000)] * 850000 }=0.0019 are 0.19%.It surveys
Strip part is constant, after increasing electrical fast transient (eft) interference suppression measure in subject PLC, measures reversed high-speed counting arteries and veins
It rushes several to malfunction 101, positive high-speed counting umber of pulse only malfunctions 367, the high-speed counting pulse after adding interference suppression measure
Waveform is shown in Fig. 5, and burst errors number in total is 101+367=468, and the ratio that bursts of error number accounts for tale umber of pulse is 468/
5,100,000=0.000092, proportion 0.0092%.
Above example be based on by electrical fast transient (eft) interference be injected into subject PLC power supply in test method under institute
It is obtaining as a result, the test method and thinking are equally applicable to interfere to press from both sides by capacitive coupling by impulse train to be coupled to high-speed counting
Situation on pulse signal-line, either interference power, or interference signal of communication line, impulse train interference is brought to be influenced all
In the error number that can show high-speed counting umber of pulse.High-speed counting pulse communication error rate=bursts of error can be defined thus
Number/overall pulse number * 100%, in actual tests, error number is usually more much smaller than sum, thus error rate ppm (i.e. million
/ mono-) relatively more reasonable to define, then definition counts pulse communication error rate=(bursts of error number/overall pulse number) * 1000 again,
000(ppm).Assuming that high-speed counting pulse sum is M, error number N, error rate R, then R=N/M*1000,000 (ppm).
By this definition, then the error rate in above example before no pulse group interference suppression measure is exactly 1900ppm, is increased
Error rate after braking measure is 92ppm.Interference letter after increase interference suppression measure in high-speed counting pulses low section
Number amplitude is obviously lower than before unrestraint measure, illustrates that braking measure is effective to mitigating or eliminating the influence of impulse train interference
It is believable.Similarly, from the point of view of the error rate for inhibiting front and back high-speed counting pulse, the error rate after inhibition is 92ppm, before inhibition
For 1900ppm, error rate is obviously more much smaller than before after inhibition.Illustrate that interference suppression measure is really effective.It can be seen that nothing
By from actual acquisition to impulse waveform, or from statistics of high speed count pulse error rate, can consistently embody impulse train
In interference test under different measure PLC performance variation, it will be apparent that find out through high-speed counting burst errors rate and evaluate and test pulse
The performance of PLC is effective in group's interference test, and compared with the method for observation real pulse shape, it is wrong that statistics of high speed counts pulse
Accidentally the method for rate is more accurate, comprehensively and quantification.Above example is had chosen for one of PLC high-speed counting pulse passage
Bright, each channel can count burst errors rate in this approach, if more strictly comprehensively to examine, can choose more
Counting pulse communication error rate of the maximum value of error rate as entire PLC in a channel.It can be depending on the circumstances.
Claims (1)
1. a kind of immunity experiment quantification evaluating method of programmable controller, which comprises the following steps:
Step 1 builds immunity experiment quantification evaluating apparatus, including disturbing pulse generator and two PLC, and a PLC makees
For test item, in addition a PLC is as test product is accompanied, and the power input of disturbing pulse generator is via tested device power input
Line connects external power supply one, and the power output end of disturbing pulse generator connects subject PLC via tested device power supply output line
Power supply interface, the power input of subject PLC power supply interface connection test item, accompanies test product with what individual external power supply two was connected
Pulse transmitting terminal via capacitive coupling press from both sides and high-speed counting pulse signal-line and test item high-speed counting pulse input end phase
Even, the signal output end of disturbing pulse generator is connected to capacitive coupling folder via disturbing pulse group's coaxial output line, interferes arteries and veins
Generator is rushed to be powered by external power supply two；
Step 2, by accompany test product generate frequency be XHz high-speed counting pulse and counting direction signal, pass through capacitive coupling folder connect
The high-speed counting pulse input end for being connected to test item is counted, in the process, the interference that disturbing pulse generator is generated
Signal is injected into tested device power supply output line, or is believed by the interference that capacitive coupling folder generates disturbing pulse generator
Number it is coupled on high-speed counting pulse signal-line, each counting period, accompanies test product first to send counting forward pulse Y, stop Z seconds
Whether the umber of pulse counted afterwards by test item inspection is equal to Y, while according to being that few meter or more meters respectively add up the number of error
It is saved in error number register, by counter O reset after the completion of relatively, then starts counting in reverse after being delayed, test product is accompanied to start
Suspend after sending Y counting in reverse pulse, it is whether wrong by test item counting in reverse and verification, error number and error number are deposited
It is saved after original error number is cumulative in device；
Step 3 calculates the ratio that bursts of error number in a code test runing time accounts for tale umber of pulse, in which:
Bursts of error number is the error number by error number register read；
If a code test runing time is W seconds, then tale umber of pulse=2* [W/ (Z+2*Y/X)] * Y, in formula, [] is
Rounding operation symbol.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710483152.5A CN107436584B (en) | 2017-06-22 | 2017-06-22 | A kind of immunity experiment quantification evaluating method of programmable controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710483152.5A CN107436584B (en) | 2017-06-22 | 2017-06-22 | A kind of immunity experiment quantification evaluating method of programmable controller |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107436584A CN107436584A (en) | 2017-12-05 |
| CN107436584B true CN107436584B (en) | 2019-05-28 |
Family
ID=60458868
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710483152.5A Active CN107436584B (en) | 2017-06-22 | 2017-06-22 | A kind of immunity experiment quantification evaluating method of programmable controller |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107436584B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109782100A (en) * | 2019-03-13 | 2019-05-21 | 海检检测有限公司 | A kind of test device and test method for the pincers calibration of automotive electronics capacitive coupling |
| CN109799411A (en) * | 2019-03-27 | 2019-05-24 | 杭州泰鼎检测技术有限公司 | A kind of large-current electric Clusters jamming immunity tester and its test method |
| CN110196363B (en) * | 2019-05-27 | 2021-03-02 | 杭州电子科技大学 | Industrial robot servo driver detection method based on electric fast transient pulse group |
| CN110763935B (en) * | 2019-10-25 | 2021-12-03 | 广州视源电子科技股份有限公司 | Anti-interference test method and test system |
| CN113253187A (en) * | 2020-12-24 | 2021-08-13 | 上海贝岭股份有限公司 | Electrical fast transient burst test system |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1353828A (en) * | 1999-03-30 | 2002-06-12 | 西门子能量及自动化公司 | Programmable controller method, system and apparatus |
| CN102419564A (en) * | 2011-09-29 | 2012-04-18 | 瓮福（集团）有限责任公司 | Method for improving antijamming capability of PLC (Programmable Logic Controller) analog signal |
| CN202583785U (en) * | 2012-01-20 | 2012-12-05 | 上海宝冶集团有限公司 | Security isolation and anti-interference structure of a PLC cabinet |
| KR20130028440A (en) * | 2011-09-09 | 2013-03-19 | 엘에스산전 주식회사 | Plc high speed counter and plc high speed counting method |
| CN103413169A (en) * | 2013-08-21 | 2013-11-27 | 梧州市自动化技术研究开发院 | Counter device and counting method |
| CN103631189A (en) * | 2013-06-26 | 2014-03-12 | 南车青岛四方机车车辆股份有限公司 | Rail vehicle logic control circuit diagnosis system and rail vehicle logic control circuit diagnosis method |
| CN204202713U (en) * | 2014-11-04 | 2015-03-11 | 中国计量学院 | A kind of flowmeter exports the pick-up unit of accumulated pulse |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070173960A1 (en) * | 2006-01-23 | 2007-07-26 | Shalabh Kumar | Compact modular programmable logic controller |
-
2017
- 2017-06-22 CN CN201710483152.5A patent/CN107436584B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1353828A (en) * | 1999-03-30 | 2002-06-12 | 西门子能量及自动化公司 | Programmable controller method, system and apparatus |
| KR20130028440A (en) * | 2011-09-09 | 2013-03-19 | 엘에스산전 주식회사 | Plc high speed counter and plc high speed counting method |
| CN102419564A (en) * | 2011-09-29 | 2012-04-18 | 瓮福（集团）有限责任公司 | Method for improving antijamming capability of PLC (Programmable Logic Controller) analog signal |
| CN202583785U (en) * | 2012-01-20 | 2012-12-05 | 上海宝冶集团有限公司 | Security isolation and anti-interference structure of a PLC cabinet |
| CN103631189A (en) * | 2013-06-26 | 2014-03-12 | 南车青岛四方机车车辆股份有限公司 | Rail vehicle logic control circuit diagnosis system and rail vehicle logic control circuit diagnosis method |
| CN103413169A (en) * | 2013-08-21 | 2013-11-27 | 梧州市自动化技术研究开发院 | Counter device and counting method |
| CN204202713U (en) * | 2014-11-04 | 2015-03-11 | 中国计量学院 | A kind of flowmeter exports the pick-up unit of accumulated pulse |
Non-Patent Citations (2)
| Title |
|---|
| 《PLC控制系统抗干扰措施研究及应用》;凌志辉 等;《机电一体化》;20140430;全文 |
| 《PLC控制系统的干扰源分析与抗干扰措施》;张存礼;《电气传动》;20070131;第37卷(第1期);全文 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107436584A (en) | 2017-12-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107436584B (en) | A kind of immunity experiment quantification evaluating method of programmable controller | |
| CN202433517U (en) | Portable EMC (electromagnetic compatibility) test-level detecting device for electric energy meter | |
| US11368384B2 (en) | Detecting and locating process control communication line faults from a handheld maintenance tool | |
| CN103235277B (en) | The integrated debugging apparatus of Intelligent transformer station capacitive apparatus on-line monitoring system | |
| CN105911499B (en) | Ultrasonic wave shelf depreciation metering system and method under site environment | |
| CN102565637A (en) | Oscillation wave partial discharge detection system for cable based on asynchronous double-end measurement | |
| CN103954890A (en) | DC partial discharge detection device and method for converter transformer | |
| CN103499778A (en) | Method for evaluating insulation performance of power cable in stage with voltage being 35kV or below 35kV | |
| CN201072597Y (en) | Automatic detection instrument for aviation electronic flight instrument | |
| CN203191537U (en) | Intelligentized integration debug apparatus for on-line monitoring system of transformer station capacitive equipment | |
| CN104569671B (en) | A kind of current conversion station grounded screen direct current diverting coefficient method of testing | |
| CN105572480A (en) | Method for in-situ test of broadband transmission line parameters of double-conductor type cable | |
| CN104777444A (en) | Lightning arrester discharge counter comprehensive calibration instrument and calibration method | |
| CN109307816A (en) | Power equipment test method based on substation's hybrid electromagnetic interference simulation | |
| CN102565753A (en) | Portable electromagnetic compatibility (EMC) test-level pulse timer for electric energy meter | |
| CN109116097A (en) | A kind of arrester hybrid current recording on-Line Monitor Device | |
| CN103728510B (en) | Excitation unit on-site test system and method | |
| CN103018525B (en) | Transformer station's internal short-circuit distribution of current is carried out to the apparatus and method of synchro measure | |
| CN104698352A (en) | Device and method for measuring small gap discharge time delay | |
| CN102681925A (en) | Serial peripheral device interface bus test system and method | |
| CN203422419U (en) | Electrified tester for zinc oxide lightning arrester | |
| CN103576032B (en) | The on-line measuring device of a kind of power equipment and method | |
| CN106932672B (en) | A kind of appraisal procedure of radiation of equipment interference | |
| CN203178479U (en) | Attenuation shockwave immunity test device for intelligent electric energy meter | |
| CN103809092B (en) | The wave of oscillation cable local discharge test equipment of optically-based electric-field sensor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |