CN206805224U - Diagnostic device based on digital quantity input - Google Patents
Diagnostic device based on digital quantity input Download PDFInfo
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- CN206805224U CN206805224U CN201720568738.7U CN201720568738U CN206805224U CN 206805224 U CN206805224 U CN 206805224U CN 201720568738 U CN201720568738 U CN 201720568738U CN 206805224 U CN206805224 U CN 206805224U
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- diagnostic device
- digital quantity
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Abstract
The utility model discloses a kind of diagnostic device based on digital quantity input, wherein, including：One input protection circuit, a control chip; the input protection circuit obtains external contact signal; a first switch is connected between two output ends of the input protection circuit, an output end of the input protection circuit is connected with an input of an input channel circuit；Two diodes are serially connected between two inputs of the input channel circuit, a second switch is connected between two diodes；The output end of the input channel circuit connects the control chip；Also there are two control interfaces, two control interfaces connect the first switch, the second switch respectively on the control chip.The utility model is in a controlling cycle, in the state of not influenceing normal data acquisition, has accomplished the self-diagnostic function of hardware input channel, improves the reliability and safety coefficient of whole hardware key treatment channel.
Description
Technical field
It the utility model is related to a kind of diagnostic device, more particularly to a kind of diagnostic device based on digital quantity input.
Background technology
In functional safety control system, digital quantity input signal correctly gathers, and is related to computing and output below, defeated
Entering passage own hardware must be reliable and stable.
Classical control system in the prior art, the collection of input data is simply accomplished, then has added a passage redundancy, and needed
The functional safety control system wanted, not only to accomplish that triple redundance inputs, and each input channel, band Hardware self-diagnosis circuit are fixed
Phase detects the quality of input channel own hardware, so as to accomplish to find mistake, Wrong localization, handles mistake and waits at a whole set of mistake
Reason mechanism, whole diagnostic circuit are built with the higher separation original paper of reliability, do not influence normal acquisition passage, with it is minimum into
This, accomplishes optimal diagnosis control strategy.
Utility model content
The utility model discloses a kind of diagnostic device based on digital quantity input, has self diagnosis work(to provide one kind
The diagnostic device of energy.
Above-mentioned purpose of the present utility model is achieved through the following technical solutions：
A kind of diagnostic device based on digital quantity input, wherein, including：One input protection circuit, a control chip, it is described
Input protection circuit obtains external contact signal, and a first switch is connected between two output ends of the input protection circuit,
One output end of the input protection circuit is connected with an input of an input channel circuit；The two of the input channel circuit
Two diodes are serially connected between input, a second switch is connected between two diodes；The input channel circuit
Output end connects the control chip；Also there are two control interfaces, two control interfaces connect respectively on the control chip
The first switch, the second switch.
Diagnostic device as described above based on digital quantity input, wherein, the first switch, the second switch and institute
State and be connected with the first photoelectric isolating circuit between control chip.
Diagnostic device as described above based on digital quantity input, wherein, the input channel circuit and the control core
A filter circuit is connected between piece.
Diagnostic device as described above based on digital quantity input, wherein, the filter circuit and input channel electricity
One second photoelectric isolating circuit is provided between road.
Diagnostic device as described above based on digital quantity input, wherein, the input protection circuit includes：Two-way transient state
Suppress diode, electric capacity.
Diagnostic device as described above based on digital quantity input, wherein, another input of the input channel circuit
One first electronics, a fuse are connected between a power supply.
In summary, by adopting the above-described technical solution, the utility model by input protection circuit, control chip,
First switch, input channel circuit, two diodes, the hardware diagnostic circuit of second switch composition, in a controlling cycle, no
In the state of influenceing normal data acquisition, the self-diagnostic function of hardware input channel is accomplished, has improved whole hardware key aspect
Manage the reliability and safety coefficient of passage.
Brief description of the drawings
Fig. 1 is the circuit diagram for the diagnostic device that the utility model is inputted based on digital quantity.
Embodiment
The utility model is described further with reference to the accompanying drawings and examples：
Fig. 1 is the circuit diagram for the diagnostic device that the utility model is inputted based on digital quantity, refers to Fig. 1, one kind is based on number
The diagnostic device of word amount input, wherein, including：One input protection circuit 1, a control chip 4（MCU）, input protection circuit 1 obtains
External contact signal is taken, is connected with a first switch 5 between two output ends of input protection circuit 1, the one of input protection circuit 1
Output end is connected with an input of an input channel circuit 2；Two 2 poles are serially connected between two inputs of input channel circuit 2
Manage, a second switch 6 is connected between two diodes；The output end connection control chip 4 of input channel circuit 2；Control chip 4
On also there are two control interfaces, two control interfaces connect first switch 5, second switch 6 respectively.
Fig. 1 is the circuit diagram for the diagnostic device that the utility model is inputted based on digital quantity, refers to Fig. 1 in the utility model
During specific implementation, resistance and triode are parallel between the two-port of input channel circuit 2, and in input channel circuit 2
Also there is diode, when outside closes, input circuit can turn on diode of giving out light, so as to be transferred to the other end of isolation, and
The transistor amplifier of connection has shunting action, can receive below external contact resistance 1K, can also change circuit configuration ginseng
Number meets the input requirements of client, the data signal after photoelectric isolating circuit, filter out anti-interference, is sent at data
Manage circuit and carry out computing, the whole process hardware reaction time is quick, can reach microsecond using FPGA come acquisition process, speed
Level.
Further, the mode of the utility model specific implementation input circuit diagnosis is：MCU in a major control cycle,
A diagnosis control signal is sent out, when external input signal is adopted into being 1, output control signal CTL1 controls electronic switch K1 to close
To close, such input channel is bypassed, and collection signal is changed into 0, and built in diagnostics program thinks that input channel is normal, if collection
1 is remained as, into error handling mechanism, otherwise when outside does not have contact signal, i.e., open circuit signaling, internal input channel gather
For signal 0, at this moment diagnosis control signal CTL2 works, controlling switch K2 closures, and input channel collects signal as 1, leads to
Road is normal, if the signal collected is 0, enters error handling mechanism.
Diagnostic circuit is so inputted, when external signal is 1 and 0, real-time diagnosis can be accomplished, substantially increase digital quantity
The security reliability of input channel.
Further, the first photoelectric isolating circuit 8 is connected between first switch 5, second switch 6 and control chip 4.
Further, a filter circuit 3 is connected between input channel circuit 2 and control chip 4.
Further, one second photoelectric isolating circuit 7 is provided between filter circuit 3 and input channel circuit 2.
Further, input protection circuit 1 includes：Two-way Transient Suppression Diode, electric capacity；High pressure, anti-high frequency can be resisted
Electromagnetic interference.
Further, one first electronics, an insurance are connected between another input and a power supply of input channel circuit 2
Silk.
Claims (6)
- A kind of 1. diagnostic device based on digital quantity input, it is characterised in that including：One input protection circuit, a control chip, The input protection circuit obtains external contact signal, and being connected with one first between two output ends of the input protection circuit opens Close, an output end of the input protection circuit is connected with an input of an input channel circuit；The input channel circuit Two inputs between be serially connected with two diodes, be connected with a second switch between two diodes；The input channel electricity The output end on road connects the control chip；Also there are two control interfaces, the two control interface difference on the control chip Connect the first switch, the second switch.
- 2. the diagnostic device according to claim 1 based on digital quantity input, it is characterised in that the first switch, institute State and the first photoelectric isolating circuit is connected between second switch and the control chip.
- 3. the diagnostic device according to claim 1 based on digital quantity input, it is characterised in that the input channel circuit A filter circuit is connected between the control chip.
- 4. the diagnostic device according to claim 3 based on digital quantity input, it is characterised in that the filter circuit and institute State and be provided with one second photoelectric isolating circuit between input channel circuit.
- 5. the diagnostic device according to claim 1 based on digital quantity input, it is characterised in that the input protection circuit Including：Two-way Transient Suppression Diode, electric capacity.
- 6. the diagnostic device according to claim 1 based on digital quantity input, it is characterised in that the input channel circuit Another input and a power supply between be connected with one first electronics, a fuse.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720568738.7U CN206805224U (en) | 2017-05-22 | 2017-05-22 | Diagnostic device based on digital quantity input |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720568738.7U CN206805224U (en) | 2017-05-22 | 2017-05-22 | Diagnostic device based on digital quantity input |
Publications (1)
| Publication Number | Publication Date |
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| CN206805224U true CN206805224U (en) | 2017-12-26 |
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ID=60740963
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| Application Number | Title | Priority Date | Filing Date |
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| CN201720568738.7U Active CN206805224U (en) | 2017-05-22 | 2017-05-22 | Diagnostic device based on digital quantity input |
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| Country | Link |
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| CN (1) | CN206805224U (en) |
Cited By (1)
| 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 |
-
2017
- 2017-05-22 CN CN201720568738.7U patent/CN206805224U/en active Active
Cited By (1)
| 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 |
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