CN106873469A - A kind of digital quantity acquisition device with self diagnostic capability - Google Patents
A kind of digital quantity acquisition device with self diagnostic capability Download PDFInfo
- Publication number
- CN106873469A CN106873469A CN201710205665.XA CN201710205665A CN106873469A CN 106873469 A CN106873469 A CN 106873469A CN 201710205665 A CN201710205665 A CN 201710205665A CN 106873469 A CN106873469 A CN 106873469A
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- China
- Prior art keywords
- self diagnosis
- data
- diagnosis
- digital quantity
- signal
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Classifications
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- 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
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
- G05B19/0425—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
- G05B23/00—Testing or monitoring of control systems or parts thereof
- G05B23/02—Electric testing or monitoring
- G05B23/0205—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults
- G05B23/0208—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterized by the configuration of the monitoring system
- G05B23/021—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterized by the configuration of the monitoring system adopting a different treatment of each operating region or a different mode of the monitored system, e.g. transient modes; different operating configurations of monitored system
-
- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C19/00—Electric signal transmission systems
- G08C19/36—Electric signal transmission systems using optical means to covert the input signal
-
- 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
- G05B2219/20—Pc systems
- G05B2219/26—Pc applications
- G05B2219/2612—Data acquisition interface
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Debugging And Monitoring (AREA)
Abstract
Digital quantity acquisition device of the invention, is a kind of harvester that can constantly carry out self diagnosis in the process of running, after hardware occurs random fault, can constantly produce warning message, and collection value is changed to preset safe condition automatically.Device is provided simultaneously with acquisition circuit self diagnosis, memory self diagnosis, clock self diagnosis, communication self diagnosis, processor self diagnosis, the ability of power supply self diagnosis.
Description
Technical field
Digital quantity acquisition device of the invention, can apply to the digital data acquisition of safety instrumented systems, be characterized in tool
There is comprehensive Hardware self-diagnosis ability.
Background technology
Do not reduced because safety instrumented systems need to keep in the process of running safety integrity level, it is therefore desirable to constantly
The self diagnosis for carrying out system, find phylogenetic random hardware failure, and remind attendant to safeguard system.System
The cross-diagnosis that the technology of self diagnosis of uniting is included between component, also including component self diagnosis.And of the present invention is exactly numeral
Measure the self diagnosis of harvester.
The content of the invention
Digital quantity acquisition device of the invention, is a kind of collection dress that can constantly carry out self diagnosis in the process of running
Put, after hardware occurs random fault, can constantly produce warning message, and collection value is changed to preset safety automatically
State.
Device of the invention, supports to gather 16 road direct current, 24 volts of digital quantity signals simultaneously, and the time precision of gathered data is 1
Millisecond.It is separate between the acquisition circuit of signal, without shared chip；In addition to power supply line and ground wire, without altogether
Use circuit.Between external input signal and the signal acquisition port of inside, isolated by photoelectrical coupler, in anti-stop signal
Impulse disturbances and surge interference.The collection of each signal, can simultaneously preserve the timestamp that precision is 1 millisecond.
Device of the invention, supports CAN communication, supports port led and run indicator.CAN communicates,
Using customized communication protocol, gathered data, configuration data, diagnostic data can be transmitted.Port led can show to be worked as
The collection value of front port, the diagnostic result of port；Run indicator can show the running status of present apparatus.
Device of the invention, is powered using direct current 24V power supplys, supports power supply redundancy connection, the i.e. different 24V power supplys in 2 tunnels
It is connected on device of the invention simultaneously, during any 1 power outage, device remains able to operation.
Device of the invention, it is characterised in that digital data can be gathered, and be provided simultaneously with acquisition circuit self diagnosis,
Memory self diagnosis, clock self diagnosis, communicate self diagnosis, and processor self diagnosis, power supply self diagnosis sends after diagnosis is out of order
Collection value is simultaneously set as preset value by alarm.
Brief description of the drawings
The hardware logic diagram of Fig. 1 digital quantity acquisition devices.
Fig. 2 input circuits.
Specific embodiment
The global design of device, referring to Fig. 1.Definition of the device to safe condition, practises according to the design of safety instrumented systems
Used, I/O state when typically by device powers down is defined as the safe condition of equipment.Therefore the digital quantity input signal of the present apparatus,
The safe condition of acquiescence is：Collection value all 0, i.e., collection value when input voltage is 0.
The cycle of the self diagnosis of the present apparatus is 2 hours, is 100000 times according to the mechanical mechanism life-span of general industry rank
To calculate, the mechanical life of device is not less than 20 years.Device is detected itself to be deposited after a failure, will produce diagnostic message, and lead to
Communication network is crossed to be sent to the controller of whole system or be sent to operator workstation.Meanwhile, device occurs than more serious
Failure when, can there is failure by indicator lamp shiny red display device, alarm set patrol officer notes changing the dress of failure
Put.
The present apparatus is, it is necessary to be arranged on special base plate, external signal line is directly connected to base plate or change-over terminal daughter board
On, it is delivered in the present apparatus finally by the connector of base plate, 16 road signals are each by 32 signal line transfer overvoltage signals
Road signal is all individual transmission.When input signal is 15V~24V, it is 1 to define collection value, fixed when input signal is 0V~5V
Adopted collection value is 0, by the resistance for changing signal series resistor so that the impedance jump of photoelectric coupler output end occurs defeated
Enter signal in the range of 5V~15V.
The input circuit protection of the present apparatus, shunt regulator diode weakens the influence of surge and high-voltage pulse to circuit；String
Connection self- recoverage insurance, reduces influence of the high current to circuit；Series diode, it is to avoid influence of the reverse current to circuit；Pass through
Photoelectrical coupler, by the voltage signal of outside input, is converted to the bright dark signal of light, is reconverted into the skip signal of impedance, most
Become voltage signal again eventually, realize the isolation of internal circuit and external signal.
The time precision of signal acquisition, is realized by quickly collection.Main control chip uses technical grade ARM7 processors, main
Frequency may be adjusted to 32MHz, each cycle data acquisition, data packing, self diagnosis, refreshing indicator lamp, response communication institute
The software step of needs is no more than 3000, and the average clock frequency that each software step needs is 3, then it is average that each cycle needs
Clock frequency is 9000, is calculated for 32MHz according to dominant frequency, and the time that each major cycle needs is no more than 0.3 millisecond.Therefore can
1 millisecond can be reached with the time precision for ensureing data acquisition.
The CAN communication of the present apparatus, communication protocol is formulated with reference to IEC 61784-3, for data integrity
Verification measure includes：The identifier of message, message fragment sequence number, timestamp, CRC check, data redundancy.
Present apparatus power supply, the 2 road power supply signals that outside is accessed, negative pole is attached directly together, and positive pole respectively concatenates one two
Pole pipe, then reconnects together, realizes the redundancy of external power source.Inside device, using DCDC modules, reduce the voltage to
5V。
The diagnosis coverage rate assessment table of the digital quantity acquisition device of table 1.
The diagnostic method of the present apparatus, referring to table 1.Diagnostic measures are described as follows.
1) analog input signal
The input circuit of on-site signal and device is cut off by relay, and diagnostic loop is cut into input circuit, master control
Chip controls diagnostic loop produces an input voltage for simulation, input value is read by input circuit, so as to diagnose be input into back
Road.
2) house dog
Separate hardware house dog inside main control chip is set, when in certain hour, software does not carry out house dog initialization behaviour
Make, the operation of automatic soft reboot is just carried out to chip, and in software when program starts, the mark of house dog can be read
Position, in the event of the situation that house dog is restarted, is then set to safe condition by device.
3) readwrite tests
5A is write to fixed address, the value of the address is then read, 5A is determined whether, A5 is write again, then go to read, sentenced
Whether disconnected is A5.If write-in is inconsistent with reading, memory or register failure are judged, and device is set to safety
State.
4) CRC check
When data are write in Flash, data are calculated with the CRC code of 16bit, and CRC code and data are write simultaneously
In Flash, when data are read, the CRC code of data is calculated again, and be compared with the CRC code of storage in Flash, no
It is consistent then abandon these data.If the CRC code calculated firmware, if finding inconsistent in verification, device is set
It is set to safe condition.
5) monitoring is interrupted
By either with or without the interrupt vector for using, an interruption subfunction for acquiescence is all directed to, to outage in the function
Counted, when counting more than certain value, device is set to safe condition.
6) voltage ratio compared with
Using the outside 24V for directly providing, driving testing circuit checks the 5V voltages of DCDC outputs, when the voltage pulsation of 5V surpasses
When 10%, the power supply of circuitry cuts 5V voltages is detected, realize that device enters safe condition.When circuit dead electricity is detected
Wait, automatically cut off the power supply of 5V voltages, when detecting that circuit detects 5V voltage pulsations no more than 10% again, 5V is recovered automatically
The power supply of voltage.
7) Data Comparison
Data duplication is a, store in different address spaces, during using data, compare initial data and the data for replicating,
When data are inconsistent, by discard.
8) communication protocol verification
The physical channel that will be communicated, regards black passage as, with message text section sequence number, determines that data receiver is complete, by CRC check,
Determine the correct of data.
9) clock ratio compared with
Main control chip uses 2 clock sources, and two unit interval identical counters are configured by the two clock sources, starts simultaneously at
Count, by after certain hour, comparing two count values of counter, when differing by more than 5%, judge clock failure, device is set
It is set to safe condition.
Claims (1)
1. device of the invention, it is characterised in that digital data can be gathered, and be provided simultaneously with acquisition circuit self diagnosis, deposited
Reservoir self diagnosis, clock self diagnosis, communicate self diagnosis, and processor self diagnosis, power supply self diagnosis sends police after diagnosis is out of order
Report and collection value is set as preset value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710205665.XA CN106873469A (en) | 2017-03-31 | 2017-03-31 | A kind of digital quantity acquisition device with self diagnostic capability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710205665.XA CN106873469A (en) | 2017-03-31 | 2017-03-31 | A kind of digital quantity acquisition device with self diagnostic capability |
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| Publication Number | Publication Date |
|---|---|
| CN106873469A true CN106873469A (en) | 2017-06-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710205665.XA Pending CN106873469A (en) | 2017-03-31 | 2017-03-31 | A kind of digital quantity acquisition device with self diagnostic capability |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108664373A (en) * | 2018-05-14 | 2018-10-16 | 中国南方电网有限责任公司 | A kind of PMU devices operation troubles self-diagnosing method |
| CN109270920A (en) * | 2018-09-25 | 2019-01-25 | 北京广利核***工程有限公司 | The self diagnostic capability evaluation method and device of the non-security grade I &C equipment of nuclear power station |
| CN111624916A (en) * | 2020-06-02 | 2020-09-04 | 徐州重型机械有限公司 | Functional safety type digital quantity input acquisition circuit and acquisition and diagnosis method thereof |
| CN113534701A (en) * | 2021-07-01 | 2021-10-22 | 江苏经纬轨道交通设备有限公司 | Time-sharing conduction DI circuit, digital controller and electric automation system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1011317A (en) * | 1996-06-27 | 1998-01-16 | Shimadzu Corp | Digital controller |
| CN201269911Y (en) * | 2008-09-25 | 2009-07-08 | 珠海派诺电子有限公司 | Multifunctional electric power monitor |
| CN102087621A (en) * | 2009-12-04 | 2011-06-08 | 北京广利核***工程有限公司 | Processor device with self-diagnosis function |
| CN202076850U (en) * | 2011-06-03 | 2011-12-14 | 云南电网公司普洱供电局 | Merging unit and intelligent terminal integrated device |
| JP2015118468A (en) * | 2013-12-17 | 2015-06-25 | 株式会社東芝 | Programmable controller |
-
2017
- 2017-03-31 CN CN201710205665.XA patent/CN106873469A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1011317A (en) * | 1996-06-27 | 1998-01-16 | Shimadzu Corp | Digital controller |
| CN201269911Y (en) * | 2008-09-25 | 2009-07-08 | 珠海派诺电子有限公司 | Multifunctional electric power monitor |
| CN102087621A (en) * | 2009-12-04 | 2011-06-08 | 北京广利核***工程有限公司 | Processor device with self-diagnosis function |
| CN202076850U (en) * | 2011-06-03 | 2011-12-14 | 云南电网公司普洱供电局 | Merging unit and intelligent terminal integrated device |
| JP2015118468A (en) * | 2013-12-17 | 2015-06-25 | 株式会社東芝 | Programmable controller |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108664373A (en) * | 2018-05-14 | 2018-10-16 | 中国南方电网有限责任公司 | A kind of PMU devices operation troubles self-diagnosing method |
| CN109270920A (en) * | 2018-09-25 | 2019-01-25 | 北京广利核***工程有限公司 | The self diagnostic capability evaluation method and device of the non-security grade I &C equipment of nuclear power station |
| CN111624916A (en) * | 2020-06-02 | 2020-09-04 | 徐州重型机械有限公司 | Functional safety type digital quantity input acquisition circuit and acquisition and diagnosis method thereof |
| CN113534701A (en) * | 2021-07-01 | 2021-10-22 | 江苏经纬轨道交通设备有限公司 | Time-sharing conduction DI circuit, digital controller and electric automation system |
| CN113534701B (en) * | 2021-07-01 | 2024-04-26 | 江苏经纬轨道交通设备有限公司 | Time-sharing conduction DI circuit, digital controller and electric automation system |
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Application publication date: 20170620 |
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