CN106291167A - A kind of one takes a functional safety digital quantity input module adding diagnosis - Google Patents
A kind of one takes a functional safety digital quantity input module adding diagnosis Download PDFInfo
- Publication number
- CN106291167A CN106291167A CN201610596582.3A CN201610596582A CN106291167A CN 106291167 A CN106291167 A CN 106291167A CN 201610596582 A CN201610596582 A CN 201610596582A CN 106291167 A CN106291167 A CN 106291167A
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- Prior art keywords
- circuit
- diagnosis
- takes
- input module
- digital quantity
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/66—Testing of connections, e.g. of plugs or non-disconnectable joints
- G01R31/67—Testing the correctness of wire connections in electric apparatus or circuits
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Analogue/Digital Conversion (AREA)
Abstract
A kind of one takes a functional safety digital quantity input module adding diagnosis, its electromagnetic compatibility meets the requirement of IEC61131 2 and IEC61326, diagnostic circuit needs to diagnose the DC fault of I/O path, drift and vibration fault, DC fault comprises stuck at 0 fault, short trouble between stuck at 1 fault and arbitrary signal line, diagnostic circuit can realize the crosstalk diagnosis between path, diagnostic circuit has independence with gathering path, meet the requirement that diagnostic test is spaced by low demand mode and high demand mode, the short circuit of external switch line or the fault of line open circuit can be diagnosed.It includes signal sample circuit, path protection circuit, analog switch, signal conditioning circuit, A/D change-over circuit, diagnostic circuit; signal sample circuit, path protection circuit, analog switch, signal conditioning circuit, A/D change-over circuit are sequentially connected electrically and are followed by into Micro-processor MCV, and diagnostic circuit is connected to analog switch.
Description
Technical field
The invention belongs to the technical field of industrial stokehold and safety instrumented systems, particularly relate to a kind of one and take one and add and examine
Disconnected functional safety digital quantity input module.
Background technology
Design currently for functional safety digital quantity input channel combines IEC61508 requirement, needs as follows:
1, electromagnetic compatibility meets the requirement of IEC61131-2 and IEC61326；
2, diagnostic circuit needs to diagnose the DC fault of I/O path, and drift and vibration fault, DC fault comprises stuck-
Short trouble between at 0 fault, stuck-at 1 fault and arbitrary signal line；
3, diagnostic circuit can realize the crosstalk diagnosis between path；
4, diagnostic circuit and the independence of collection path；
5, the requirement that diagnostic test is spaced by low demand mode and high demand mode is met；
6, need to diagnose the short circuit of external switch line or the fault of line open circuit.
Summary of the invention
The technical problem to be solved in the present invention is the defect overcoming prior art, it is provided that a kind of one takes a function adding diagnosis
Secure digital amount input module, its electromagnetic compatibility meets the requirement of IEC61131-2 and IEC61326, and diagnostic circuit needs diagnosis
The DC fault of I/O path, drift and vibration fault, DC fault comprises stuck-at 0 fault, stuck-at 1 fault with
And the short trouble between arbitrary signal line, diagnostic circuit can realize the crosstalk diagnosis between path, and diagnostic circuit leads to gathering
Road has independence, meets the requirement that diagnostic test is spaced by low demand mode and high demand mode, it is possible to diagnosis external switch
Line short circuit or the fault of line open circuit.
The technical scheme solving the problems referred to above is: this one takes a functional safety digital quantity input module adding diagnosis, its
Including signal sample circuit, path protection circuit, analog switch, signal conditioning circuit, A/D change-over circuit, diagnostic circuit, signal
Sample circuit, path protection circuit, analog switch, signal conditioning circuit, A/D change-over circuit are sequentially connected electrically and are followed by processing in a subtle way
Device MCU, diagnostic circuit is connected to analog switch.
The present invention not only acquires external signal, may determine that external switch Wiring faults simultaneously, simple, and electromagnetism is held concurrently
Holding the requirement meeting IEC61131-2 and IEC61326, diagnostic circuit needs to diagnose the DC fault of I/O path, drifts about and vibrates
Fault, DC fault comprises the short trouble between stuck-at 0 fault, stuck-at 1 fault and arbitrary signal line, examines
Deenergizing can realize between path crosstalk diagnosis, diagnostic circuit with gather path there is independence, meet low demand mode and
The requirement that diagnostic test is spaced by high demand mode, it is possible to diagnosis external switch line short circuit or the fault of line open circuit.
Accompanying drawing explanation
Fig. 1 is the circuit block diagram that according to the present invention takes a functional safety digital quantity input module adding diagnosis.
Fig. 2 is external switch string resistance schematic diagram.
Fig. 3 is the circuit diagram of signal sample circuit.
Fig. 4 is the circuit diagram of diagnostic circuit.
Detailed description of the invention
As it is shown in figure 1, this one takes a functional safety digital quantity input module adding diagnosis, it includes signal sampling electricity
Road, path protection circuit, analog switch, signal conditioning circuit, A/D change-over circuit, diagnostic circuit, signal sample circuit, path
Protection circuit, analog switch, signal conditioning circuit, A/D change-over circuit are sequentially connected electrically and are followed by into Micro-processor MCV, diagnosis electricity
Road is connected to analog switch.
The present invention not only acquires external signal, may determine that external switch Wiring faults simultaneously, simple, and electromagnetism is held concurrently
Holding the requirement meeting IEC61131-2 and IEC61326, diagnostic circuit needs to diagnose the DC fault of I/O path, drifts about and vibrates
Fault, DC fault comprises the short trouble between stuck-at 0 fault, stuck-at 1 fault and arbitrary signal line, examines
Deenergizing can realize between path crosstalk diagnosis, diagnostic circuit with gather path there is independence, meet low demand mode and
The requirement that diagnostic test is spaced by high demand mode, it is possible to diagnosis external switch line short circuit or the fault of line open circuit.
It addition, signal sample circuit, path protection circuit are also connected with a switch, switch belongs to the contact of double-width grinding,
This one takes a functional safety digital quantity input module adding diagnosis and gathers outside dry contact on-off model.
It addition, the configuration of outside dry contact on-off model is four kinds of states, respectively normal acquisition normally opened contact, normal
Gather normally-closed contact, the normally opened contact of band aerial lug diagnosis, the normally-closed contact of band aerial lug, these several different configuration modes
Under, according to gathering voltage, signal sample circuit judges whether external switch state and aerial lug exist the dangerous of line and lose
Effect.
It addition, signal conditioning circuit is made up of amplifier and divider resistance, improves signal stabilization and meet A/D circuit and adopt
The requirement of collection scope.
It addition, A/D change-over circuit is realized by the A/D conversion chip of a piece of 12bit resolution, processed respectively by MCU
Plant signal.
It addition, as in figure 2 it is shown, configuration is a resistance in parallel or the mode of one resistance of series connection.
It addition, as it is shown on figure 3, signal sample circuit includes the first resistance (R1), the second resistance
(R2), path protection circuit includes the first protective tube (F1), the first diode (D1), the first protective tube (F1),
Ground connection after the series connection of one resistance (R1), the second resistance (R2), the first diode
(D1) negative pole is connected between the first protective tube and the first resistance and plus earth.
It addition, the voltage at the two ends of the first resistance (R1) is respectively VA, VB, if the scope of VA/VB isThen signal sample circuit be do not have out of order.
It addition, as shown in Figure 4, diagnostic circuit is made up of six test patterns, and analog switch, signal conditioning circuit, A/D turn
Change the diagnosis of circuit, by the diagnosis of these six diagnosis voltages, meet the requirement of Acquisition Circuit gamut diagnosis, including DC-
Fault, drift about and vibrate.
Further comprises the collection overvoltage of voltage, under-voltage supervisory circuit in the present invention, these fault-avoidance patterns are product
Functional safety provide the foundation, meet simultaneously functional safety propose multinomial EMC technical specification.
By rational PCB layout, allow respectively between individual channel and do not intersect, avoid the signal that PCB trace brings as far as possible
Crosstalk Faults.
The collection of the functional safety digital quantity input module of the present invention, according to different configuration mode, it is judged that external switch
State and aerial lug whether there is fault, it is considered to gather trueness error that may be present and the error of cable in path, always
It is as shown in table 1 that knot gathers voltage range.
Table 1
The functional safety of the present invention Acquisition Circuit of digital quantity input quantity signal, the diagnostic method of crossfire is,
One of them path changes from " 0 " to " 1 ", it is judged that whether other 7 passages are affected.
The above, be only presently preferred embodiments of the present invention, and the present invention not makees any pro forma restriction.This area
Those of ordinary skill it should be understood that every technical spirit according to the present invention any simply repairing that above example is made
Change, equivalent variations and modification, the most still belong to the protection domain of technical solution of the present invention.
Claims (9)
1. one kind one takes a functional safety digital quantity input module adding diagnosis, it is characterised in that: it include signal sample circuit,
Path protection circuit, analog switch, signal conditioning circuit, A/D change-over circuit, diagnostic circuit, signal sample circuit, path protection
Circuit, analog switch, signal conditioning circuit, A/D change-over circuit are sequentially connected electrically and are followed by into Micro-processor MCV, and diagnostic circuit is even
Receive analog switch.
The most according to claim 1 one takes a functional safety digital quantity input module adding diagnosis, it is characterised in that: signal
Sample circuit, path protection circuit are also connected with a switch, and switch belongs to the contact of double-width grinding, and this one takes a merit adding diagnosis
Outside dry contact on-off model can be gathered by secure digital amount input module.
The most according to claim 2 one takes a functional safety digital quantity input module adding diagnosis, it is characterised in that: outside
The configuration of dry contact on-off model is four kinds of states, respectively outside normal acquisition normally opened contact, normal acquisition normally-closed contact, band
The normally opened contact of portion's line diagnosis, the normally-closed contact of band aerial lug, under these several different configuration modes, signal sample circuit root
Judge whether external switch state and aerial lug exist the dangerous inefficacy of line according to gathering voltage.
The most according to claim 3 one takes a functional safety digital quantity input module adding diagnosis, it is characterised in that: signal
Modulate circuit is made up of amplifier and divider resistance, improves signal stabilization and meets the requirement of A/D circuit acquisition range.
The most according to claim 4 one takes a functional safety digital quantity input module adding diagnosis, it is characterised in that: A/D
Change-over circuit is realized by the A/D conversion chip of a piece of 12bit resolution, processes various signal by MCU.
The most according to claim 5 one takes a functional safety digital quantity input module adding diagnosis, it is characterised in that: configuration
For a resistance in parallel or the mode of one resistance of series connection.
The most according to claim 6 one takes a functional safety digital quantity input module adding diagnosis, it is characterised in that: signal
Sample circuit includes the first resistance (R1), the second resistance (R2), and path protection circuit includes the first protective tube (F1), the one or two pole
Pipe (D1), ground connection after the series connection of the first protective tube (F1), the first resistance (R1), the second resistance (R2), bearing of the first diode (D1)
Pole is connected between the first protective tube and the first resistance and plus earth.
The most according to claim 7 one takes a functional safety digital quantity input module adding diagnosis, it is characterised in that: the first electricity
The voltage at the two ends of resistance (R1) is respectively VA, VB, if the scope of VA/VB is
Then signal sample circuit be do not have out of order.
The most according to claim 8 one takes a functional safety digital quantity input module adding diagnosis, it is characterised in that: diagnosis
Circuit is made up of six test patterns, analog switch, signal conditioning circuit, the diagnosis of A/D change-over circuit, by these six diagnosis
The diagnosis of voltage, meets the requirement of Acquisition Circuit gamut diagnosis, including DC-fault, drifts about and vibrate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610596582.3A CN106291167A (en) | 2016-07-26 | 2016-07-26 | A kind of one takes a functional safety digital quantity input module adding diagnosis |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610596582.3A CN106291167A (en) | 2016-07-26 | 2016-07-26 | A kind of one takes a functional safety digital quantity input module adding diagnosis |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106291167A true CN106291167A (en) | 2017-01-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610596582.3A Pending CN106291167A (en) | 2016-07-26 | 2016-07-26 | A kind of one takes a functional safety digital quantity input module adding diagnosis |
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| CN (1) | CN106291167A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107145103A (en) * | 2017-05-22 | 2017-09-08 | 上海自动化仪表有限公司 | The diagnostic device inputted based on digital quantity |
| CN111398794A (en) * | 2020-03-31 | 2020-07-10 | 苏州汇川技术有限公司 | Digital quantity input signal detection circuit and elevator controller |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120146663A1 (en) * | 2008-02-01 | 2012-06-14 | Thomas Bruce Meagher | Input Channel Diagnostics |
| CN102916689A (en) * | 2012-11-12 | 2013-02-06 | 北京广利核系统工程有限公司 | Digital value acquisition circuit with fault diagnosis capacity |
| CN102970029A (en) * | 2012-11-06 | 2013-03-13 | 北京广利核系统工程有限公司 | High-safety digital quantity signal acquisition circuit |
| CN202837372U (en) * | 2012-09-25 | 2013-03-27 | 上海微频莱机电科技有限公司 | Voltage detection circuit |
| CN203012501U (en) * | 2012-11-12 | 2013-06-19 | 中国船舶重工集团公司第七一一研究所 | Multipurpose diagnosable signal acquisition module |
| CN103728907A (en) * | 2014-01-20 | 2014-04-16 | 中国船舶重工集团公司第七一一研究所 | Diagnostic multi-type signal collecting module |
-
2016
- 2016-07-26 CN CN201610596582.3A patent/CN106291167A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120146663A1 (en) * | 2008-02-01 | 2012-06-14 | Thomas Bruce Meagher | Input Channel Diagnostics |
| CN202837372U (en) * | 2012-09-25 | 2013-03-27 | 上海微频莱机电科技有限公司 | Voltage detection circuit |
| CN102970029A (en) * | 2012-11-06 | 2013-03-13 | 北京广利核系统工程有限公司 | High-safety digital quantity signal acquisition circuit |
| CN102916689A (en) * | 2012-11-12 | 2013-02-06 | 北京广利核系统工程有限公司 | Digital value acquisition circuit with fault diagnosis capacity |
| CN203012501U (en) * | 2012-11-12 | 2013-06-19 | 中国船舶重工集团公司第七一一研究所 | Multipurpose diagnosable signal acquisition module |
| CN103728907A (en) * | 2014-01-20 | 2014-04-16 | 中国船舶重工集团公司第七一一研究所 | Diagnostic multi-type signal collecting module |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107145103A (en) * | 2017-05-22 | 2017-09-08 | 上海自动化仪表有限公司 | The diagnostic device inputted based on digital quantity |
| CN111398794A (en) * | 2020-03-31 | 2020-07-10 | 苏州汇川技术有限公司 | Digital quantity input signal detection circuit and elevator controller |
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Application publication date: 20170104 |