CN207717932U - Circuit state diagnostic circuit - Google Patents
Circuit state diagnostic circuit Download PDFInfo
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- CN207717932U CN207717932U CN201721117096.5U CN201721117096U CN207717932U CN 207717932 U CN207717932 U CN 207717932U CN 201721117096 U CN201721117096 U CN 201721117096U CN 207717932 U CN207717932 U CN 207717932U
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Abstract
The utility model discloses a kind of circuit state diagnostic circuits.Wherein, which includes：First sub-circuit, the second sub-circuit and external controller, wherein the first sub-circuit, the level signal for exporting the first sub-circuit；Second sub-circuit, the level signal for exporting the second sub-circuit；External controller is connect with the first sub-circuit and the second sub-circuit respectively, for the level signal according to the level signal and the second sub-circuit of the first sub-circuit, judge switching value state and circuit whether failure.The utility model solves the defect due to the prior art, the caused insecure technical problem of switch acquisition.
Description
Technical field
The utility model is related to application of electronic technology field, in particular to a kind of circuit state diagnostic circuit.
Background technology
In industrial control system, switching value refers to the corresponding value that is turned on or off of controlled relay.In controller
Before sending out instruction, the status information for obtaining current controll plant is needed, i.e., to obtain on-off model.It needs under normal circumstances same
When the on-off model that acquires be 8 tunnels or 16 tunnels, therefore switch quantity acquisition circuit is mostly used cheap optocoupler and realizes.Work is former
Reason is as depicted in figs. 1 and 2.
Fig. 1 is that a kind of circuit diagram acquiring switching value using optocoupler, the operation principle are specific as follows in the prior art：
When switch disconnects, optocoupler previous diodes are not turned on, and according to the operation principle of optocoupler, optocoupler rear class triode output circuit is cut
Only, high level signal is collected at this time；Otherwise when the switch is closed, optocoupler previous diodes are connected, then optocoupler rear class triode
Output circuit is also switched on, and collects low level signal at this time.
Fig. 2 is another circuit diagram using optocoupler acquisition switching value in the prior art, and the operation principle is specifically such as
Under：When switch disconnects, optocoupler previous diodes are not turned on, according to the operation principle of optocoupler, optocoupler rear class triode output circuit
Cut-off, collects low level signal at this time；Otherwise when the switch is closed, optocoupler previous diodes are connected, then three pole of optocoupler rear class
Pipe output circuit is also switched on, and collects high level signal at this time.
Technical solution as shown in Figure 1, when constant conduction failure occurs for optocoupler, no matter the switch at scene is in open state
Or closed state, output signal are always low level, are unable to the state of correct response scene switch；When optocoupler continues not
When conducting failure, no matter the switch at scene is in open state or closed state, and output signal is high level, Bu Nengzheng always
The really state of reaction scene switch.Therefore technical solution shown in Fig. 1, optocoupler failure can cause controller to be judged by accident.
Technical solution as shown in Figure 2, when constant conduction failure occurs for optocoupler, no matter the switch at scene is in open state
Or closed state, output signal are always high level, are unable to the state of correct response scene switch；When optocoupler continues not
When conducting failure, no matter the switch at scene is in open state or closed state, and output signal is low level, Bu Nengzheng always
The really state of reaction scene switch.Therefore technical solution shown in Fig. 2, optocoupler failure can cause controller to be judged by accident.
To general commercial Application, technical solution can meet design requirement shown in Fig. 1 and Fig. 2, but to reliability and peace
In the exigent functional safety product of full property, it may result in control system and lose safety protection function.
For the above-mentioned defect due to the prior art, the caused insecure problem of switch acquisition not yet proposes at present
Effective solution scheme.
Utility model content
The utility model embodiment provides a kind of circuit state diagnostic circuit, at least to solve lacking due to the prior art
It falls into, the caused insecure technical problem of switch acquisition.
According to the one side of the utility model embodiment, a kind of circuit state diagnostic circuit is provided, including：First son
Circuit, the second sub-circuit and external controller, wherein the first sub-circuit, the level signal for exporting the first sub-circuit；Second
Sub-circuit, the level signal for exporting the second sub-circuit；External controller connects with the first sub-circuit and the second sub-circuit respectively
It connects, is used for the level signal of the level signal and the second sub-circuit according to the first sub-circuit, judges the state and electricity of switching value
Road whether failure.
Optionally, circuit state diagnostic circuit further includes：Switch set, the first resistor in resistance set and the 7th resistance
And the first diode in diode group and the second diode, wherein the first resistor in resistance set and the 7th resistance string
Connection, wherein connected by the second switch in switch set between first resistor and the 7th resistance, the input terminal of first resistor connects
External power supply, one end of the output end connection second switch of first resistor are connect, the other end of second switch connects the 7th resistance, the
The output end of seven resistance accesses the second sub-circuit；First switch in switch set and third switch in parallel access circuit, first
The both ends of one end access second switch of switch and third switch, the other end of first switch are connect with the first diode, third
Switch is connect with the second diode, the first diode and the second diodes in parallel, the first diode and the second diode it is another
End is connected by normally opened contact KO；Third switchs and the output end of second switch accesses the first sub-circuit；Wherein, in circuit state
In the case that diagnostic circuit is in signal acquisition state, first switch and third switch conduction, second switch disconnect, with normally opened
The closure or openness of contact KO, external controller acquire the level signal of the level signal and the second sub-circuit of the first sub-circuit；
In the case where circuit state diagnostic circuit is in channel self-test state, second switch conducting, first switch and third switch are disconnected
It opens, external controller acquires the level signal of the level signal and the second sub-circuit of the first sub-circuit.
Further, optionally, the first sub-circuit includes：Voltage-stabiliser tube, the second resistance in resistance set, 3rd resistor,
In 4th resistance, the 5th resistance and the first triode and the second triode, optocoupler set in the 6th resistance, triode set
The 4th diode in first optocoupler and diode group, wherein voltage-stabiliser tube is switched with third and the output end of second switch is connect,
The output end of voltage-stabiliser tube is connect with one end of the 5th resistance, the other end of the 5th resistance one end and second with the 6th resistance respectively
The base stage of triode connects, the other end ground connection of the 6th resistance, the emitter ground connection of the second triode, the current collection of the second triode
Pole is connect by the 4th resistance with external power supply, and is connect with the base stage of the first triode, the emitter of the first triode and
One end of four diodes connects, and the other end ground connection of the 4th diode, the collector of the first triode is connect with the first optocoupler, the
One end of two resistance is connect with external power supply, and the other end of second resistance is connect with the first optocoupler, the output end point of the first optocoupler
It is not connect with one end of output pin and 3rd resistor, the other end ground connection of 3rd resistor；Wherein, the first optocoupler includes：Single-pass
Road optocoupler or binary channels optocoupler.
Optionally, the second sub-circuit includes：The 8th resistance, the 9th resistance in resistance set and the tenth resistance, triode
The second optocoupler in third transistor and optocoupler set in set, wherein one end of the tenth resistance is connect with the 7th resistance, the
The other end of ten resistance is grounded, and the base stage of third transistor is connect with the tenth resistance, the emitter ground connection of third transistor, third
The collector of triode is connect with the second optocoupler, and one end of the 8th resistance is connect with external power supply, the other end of the 8th resistance with
Second optocoupler connects, and the output end of the second optocoupler connect with one end of output pin and the 9th resistance respectively, the 9th resistance it is another
One end is grounded；Wherein, the second optocoupler includes：Single channel optocoupler or binary channels optocoupler.
Optionally, first switch, second switch and third switch include：Triode or optocoupler.
Optionally, the first diode and the second diode include：Anti-reverse diode, wherein anti-reverse diode includes：
Schottky diode.
In the utility model embodiment, pass through the first sub-circuit, the second sub-circuit and external controller, wherein first
Sub-circuit, the level signal for exporting the first sub-circuit；Second sub-circuit, the level signal for exporting the second sub-circuit；
External controller is connect with the first sub-circuit and the second sub-circuit respectively, for according to the level signal of the first sub-circuit and the
The level signal of two sub-circuits, judge switching value state and circuit whether failure, on-off model can be acquired by having reached,
The purpose diagnosed can be done to Acquisition Circuit again, to realize the technique effect for improving signal acquisition circuit functional reliability, into
And solve the defect due to the prior art, the caused insecure technical problem of switch acquisition.
Description of the drawings
Attached drawing described herein is used to provide a further understanding of the present invention, and is constituted part of this application,
The exemplary embodiment of the utility model and the description thereof are used to explain the utility model, does not constitute to the improper of the utility model
It limits.In the accompanying drawings：
Fig. 1 be in the prior art it is a kind of using optocoupler acquire switching value circuit diagram；
Fig. 2 is the circuit diagram that another kind acquires switching value using optocoupler in the prior art；
Fig. 3 is the structural schematic diagram according to the circuit state diagnostic circuit of the utility model embodiment；
Fig. 4 is the structural schematic diagram according to a kind of circuit state diagnostic circuit of the utility model embodiment；
Fig. 5 is the structural schematic diagram according to another circuit state diagnostic circuit of the utility model embodiment.
Specific implementation mode
In order to make those skilled in the art more fully understand the utility model, below in conjunction with the utility model reality
The attached drawing in example is applied, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that described
Embodiment is only the embodiment of the utility model part, instead of all the embodiments.Based on the reality in the utility model
Example is applied, every other embodiment obtained by those of ordinary skill in the art without making creative efforts is all answered
When the range for belonging to the utility model protection.
According to the utility model embodiment, a kind of circuit state diagnostic circuit embodiment is provided, Fig. 3 is according to this practicality
The structural schematic diagram of the circuit state diagnostic circuit of new embodiment, as shown in figure 3, the circuit state diagnostic circuit includes：The
One sub-circuit 32, the second sub-circuit 34 and external controller 36, wherein
First sub-circuit 32, the level signal for exporting the first sub-circuit 32；Second sub-circuit 34, for exporting second
The level signal of sub-circuit 34；External controller 36 is connect with the first sub-circuit 32 and the second sub-circuit 34 respectively, is used for basis
The level signal of the level signal of first sub-circuit 32 and the second sub-circuit 34 judges whether the state of switching value and circuit are former
Barrier.
In the utility model embodiment, pass through the first sub-circuit, the second sub-circuit and external controller, wherein first
Sub-circuit, the level signal for exporting the first sub-circuit；Second sub-circuit, the level signal for exporting the second sub-circuit；
External controller is connect with the first sub-circuit and the second sub-circuit respectively, for according to the level signal of the first sub-circuit and the
The level signal of two sub-circuits, judge switching value state and circuit whether failure, on-off model can be acquired by having reached,
The purpose diagnosed can be done to Acquisition Circuit again, to realize the technique effect for improving signal acquisition circuit functional reliability, into
And solve the defect due to the prior art, the caused insecure technical problem of switch acquisition.
Optionally, circuit state diagnostic circuit provided by the present application further includes：The first electricity in switch set, resistance set
Resistance and the 7th resistance and the first diode in diode group and the second diode, wherein the first resistor in resistance set
It connects with the 7th resistance, wherein connected by the second switch in switch set between first resistor and the 7th resistance, the first electricity
The input terminal of resistance connects external power supply, one end of the output end connection second switch of first resistor, and the other end of second switch connects
The 7th resistance is connect, the output end of the 7th resistance accesses the second sub-circuit 34；First switch and third switch in switch set are simultaneously
Couple into circuit, the both ends for one end access second switch that first switch and third switch, the other end of first switch and first
Diode connects, and third switch is connect with the second diode, the first diode and the second diodes in parallel, the first diode and the
The other end of two diodes is connected by normally opened contact KO；Third switchs and the output end of second switch accesses the first sub-circuit
32；Wherein, in the case where circuit state diagnostic circuit is in signal acquisition state, first switch and third switch conduction, the
Two switches disconnect, with the closure or openness of normally opened contact KO, external controller acquire the first sub-circuit 32 level signal and
The level signal of second sub-circuit 34；In the case where circuit state diagnostic circuit is in channel self-test state, second switch is led
Logical, first switch and third switch disconnect, and external controller acquires the level signal and the second sub-circuit 34 of the first sub-circuit 32
Level signal.
Further, optionally, the first sub-circuit 32 includes：Voltage-stabiliser tube, the second resistance in resistance set, third electricity
Resistance, the 4th resistance, the 5th resistance and the first triode in the 6th resistance, triode set and the second triode, optocoupler set
In the first optocoupler and diode group in the 4th diode, wherein voltage-stabiliser tube and third switch and the output end of second switch
Connection, the output end of voltage-stabiliser tube connect with one end of the 5th resistance, the other end of the 5th resistance one end with the 6th resistance respectively
It is connected with the base stage of the second triode, the other end ground connection of the 6th resistance, the emitter ground connection of the second triode, the second triode
Collector connect with external power supply by the 4th resistance, and connect with the base stage of the first triode, the transmitting of the first triode
Pole is connect with one end of the 4th diode, the other end ground connection of the 4th diode, the collector of the first triode and the first optocoupler
Connection, one end of second resistance connect with external power supply, and the other end of second resistance is connect with the first optocoupler, the first optocoupler it is defeated
Outlet is connect with one end of output pin and 3rd resistor respectively, the other end ground connection of 3rd resistor；Wherein, the first optocoupler packet
It includes：Single channel optocoupler or binary channels optocoupler.
Optionally, the second sub-circuit 34 includes：The 8th resistance, the 9th resistance in resistance set and the tenth resistance, three poles
The second optocoupler in third transistor and optocoupler set in pipe set, wherein one end of the tenth resistance is connect with the 7th resistance,
The other end of tenth resistance is grounded, and the base stage of third transistor is connect with the tenth resistance, the emitter ground connection of third transistor, the
The collector of three triodes is connect with the second optocoupler, and one end of the 8th resistance is connect with external power supply, the other end of the 8th resistance
It is connect with the second optocoupler, the output end of the second optocoupler is connect with one end of output pin and the 9th resistance respectively, the 9th resistance
The other end is grounded；Wherein, the second optocoupler includes：Single channel optocoupler or binary channels optocoupler.
Optionally, first switch, second switch and third switch include：Triode or optocoupler.
Optionally, the first diode and the second diode include：Anti-reverse diode, wherein anti-reverse diode includes：
Schottky diode.
To sum up, circuit state diagnostic circuit provided by the present application, while realizing switch acquisition and circuit diagnostics function.Tool
Body is as shown in figure 4, Fig. 4 is the structural schematic diagram according to a kind of circuit state diagnostic circuit of the utility model embodiment.
As shown in figure 4, circuit state diagnostic circuit provided by the present application is by diode, voltage-stabiliser tube, resistance, triode and light
The compositions such as coupling and power supply FV+, SV+.Each channel circuit provides status inquiry power supply for outside connected switch, and current switch amount
Condition conversion is that 2 road signals are output to back-end controller.When normal acquisition, SW1 (that is, first switch provided by the present application) and
SW3 (that is, third provided by the present application switchs) conducting, SW2 (that is, second switch provided by the present application) are not turned on, DI_P and DI_
The signal of N (that is, output pin provided by the present application) is different, if DI_P and DI_N is simultaneously high level or low level, judges
For fault.When the self-test of channel, SW1 and SW3 are not turned on, and the signal of SW2 conductings, DI_P and DI_N is different, if DI_P and DI_
N is simultaneously high level or low level, then is judged as fault.Rear end acquisition controller by comparing DI_P and DI_N letter
Number, judge current switch amount state and circuit whether failure.
Illustrate the operation principle of the utility model by taking external normally opened contact KO as an example below.In circuit shape provided by the present application
It is illustrated by two scenes in state diagnostic circuit, Fig. 5 is examined according to another circuit state of the utility model embodiment
The structural schematic diagram of deenergizing, it is specific as shown in Figure 5：
Scene one：Normal acquisition works
As shown in figure 5, KO is kept it turning under normal circumstances, SW1 and SW3 conductings, SW2 are not turned on, and voltage FV+ cannot pass through
KO reaches A points：(1) no-voltage on resistance R10 (that is, the tenth resistance provided by the present application), triode Q3 is (that is, the application provides
Third transistor) can not be connected, optocoupler U2 (that is, second optocoupler provided by the present application) cut-off, DI_N is low level；(2) steady
It is not turned on without breakdown voltage, D3 on pressure pipe D3 (that is, voltage-stabiliser tube provided by the present application), resistance R6 is (that is, the provided by the present application 6th
Resistance) on no-voltage, triode Q2 (that is, second triode provided by the present application) can not open；Voltage FV+ is (that is, the application carries
The external power supply of confession) by resistance R4 (that is, the 4th resistance provided by the present application) it is triode Q1 (that is, provided by the present application the
One triode) cut-in voltage is provided, so that Q1 is connected, optocoupler U1 (that is, first optocoupler provided by the present application) conductings, DI_P is high electricity
It is flat.
When KO is closed, voltage FV+ can reach A points by KO：(1) resistance R7 is (that is, the 7th electricity provided by the present application
Resistance) and R10 (that is, the tenth resistance provided by the present application) A points are divided, obtain higher than triode Q3 cut-in voltages on resistance R10
Voltage value, triode Q3 conducting, optocoupler U2 conductings, DI_N is high level；(2) voltage of A points is more than the breakdown voltage of D3, D3
Conducting, resistance R5 (that is, the 5th resistance provided by the present application) and R6 obtain higher than three the voltage by D3 on resistance R6
The voltage value of pole pipe Q2 cut-in voltages, triode Q2 conductings, FV+ constitutes circuit over the ground by R4 and Q2 at this time；Due to the collection of Q2
The electric conduction of cut-in voltage and diode D4 (that is, provided by the present application fourth diode) of the electrode-transmitter extreme pressure drop less than Q1
The sum of pressure, so Q1 can not be connected, optocoupler U1 cut-offs, DI_P is low level.
To sum up, the state of KO is may determine that by comparing the signal of DI_P and DI_N.If DI_P and DI_N is simultaneously height
Level or low level, then be judged as fault.
Scene two：Channel self-test work
When the self-test of channel, SW1 and SW3 are not turned on, and SW2 conductings, FV+ reaches A points by R1：(1) resistance R7 is (that is, this Shen
The 7th resistance that please be provide) and R10 A points are divided, obtain the voltage value higher than triode Q3 cut-in voltages on resistance R10, three
Pole pipe Q3 conductings, optocoupler U2 conductings, DI_N is high level；(2) voltage of A points is more than the breakdown voltage of D3, D3 conductings, resistance R5
Obtain the voltage value higher than triode Q2 cut-in voltages with R6 to the voltage by D3, on resistance R6, triode Q2 conductings,
FV+ constitutes circuit over the ground by R4 and Q2 at this time；The cut-in voltage less than Q1 and two poles due to collector-emitter voltage drop of Q2
The sum of the conducting voltage of pipe D4, so Q1 can not be connected, optocoupler U1 cut-offs, DI_P is low level.
To sum up, it may determine that whether circuit is normal by comparing the signal of DI_P and DI_N.If DI_P and DI_N are simultaneously
For high level or low level, then it is judged as fault.
Triode or optocoupler can be used in SW1, SW2 and SW3 in circuit state diagnostic circuit provided by the present application；Optocoupler U1 and
2 single channel optocouplers or 1 binary channels optocoupler can be used in U2；Anti-reverse diode D1 and D2 uses Schottky diode；Two poles
Pipe D4 uses general-purpose diode.
It should be noted that circuit state diagnostic circuit provided by the present application is only said by preferable example of above-mentioned example
It is bright, it is subject to and realizes circuit state diagnostic circuit provided by the present application, do not limit specifically.
On-off model can be acquired in circuit state diagnostic circuit provided by the present application and Acquisition Circuit is examined
It is disconnected, improve signal acquisition circuit functional reliability.
Above-mentioned the utility model embodiment serial number is for illustration only, can not represent the quality of embodiment.
The above is only the preferred embodiment of the utility model, it is noted that for the common skill of the art
For art personnel, without departing from the principle of this utility model, several improvements and modifications can also be made, these improve and
Retouching also should be regarded as the scope of protection of the utility model.
Claims (5)
1. a kind of circuit state diagnostic circuit, which is characterized in that including：First sub-circuit, the second sub-circuit and external controller,
Wherein,
First sub-circuit, the level signal for exporting first sub-circuit；
Second sub-circuit, the level signal for exporting second sub-circuit；
The external controller is connect with first sub-circuit and second sub-circuit respectively, for according to described first
The level signal of the level signal of sub-circuit and second sub-circuit, judge switching value state and circuit whether failure；
Wherein, the circuit state diagnostic circuit further includes：Switch set, the first resistor in resistance set and the 7th resistance with
And the first diode in diode group and the second diode, wherein
First resistor in the resistance set and the series connection of the 7th resistance, wherein the first resistor and the 7th resistance it
Between connected by second switch in the switch set, the input terminal of the first resistor connects external power supply, described first
The output end of resistance connects one end of the second switch, and the other end of the second switch connects the 7th resistance, described
The output end of 7th resistance accesses second sub-circuit；
First switch and third switch in parallel in the switch set access circuit, the first switch and third switch
One end access the both ends of the second switch, the other end of the first switch is connect with first diode, described
Three switches are connect with second diode, first diode and second diodes in parallel, first diode
It is connected by normally opened contact KO with the other end of second diode；The output end of the third switch and the second switch
Access first sub-circuit；
Wherein, in the case where the circuit state diagnostic circuit is in signal acquisition state, the first switch and described
Three switch conductions, the second switch disconnects, with the closure or openness of the normally opened contact KO, the external controller acquisition
The level signal of the level signal of first sub-circuit and second sub-circuit；
In the case where the circuit state diagnostic circuit is in channel self-test state, the second switch conducting, described first
Switch and third switch disconnect, and the external controller acquires the level signal of first sub-circuit and second son
The level signal of circuit.
2. circuit state diagnostic circuit according to claim 1, which is characterized in that first sub-circuit includes：Voltage stabilizing
In pipe, the second resistance in the resistance set, 3rd resistor, the 4th resistance, the 5th resistance and the 6th resistance, triode set
The first triode and the second triode, optocoupler set in the first optocoupler and diode group in the 4th diode, wherein
The voltage-stabiliser tube is switched with the third and the output end of the second switch is connect, the output end of the voltage-stabiliser tube and institute
State one end connection of the 5th resistance, the other end of the 5th resistance one end and the described 2nd 3 with the 6th resistance respectively
The base stage of pole pipe connects, the other end ground connection of the 6th resistance, the emitter ground connection of second triode, and the described 2nd 3
The collector of pole pipe is connect by the 4th resistance with external power supply, and is connect with the base stage of first triode, described
The emitter of first triode is connect with one end of the 4th diode, the other end ground connection of the 4th diode, described
The collector of first triode is connect with first optocoupler, and one end of the second resistance is connect with external power supply, and described
The other end of two resistance is connect with first optocoupler, the output end of first optocoupler respectively with output pin and the third
One end of resistance connects, the other end ground connection of the 3rd resistor；
Wherein, first optocoupler includes：Single channel optocoupler or binary channels optocoupler.
3. circuit state diagnostic circuit according to claim 1, which is characterized in that second sub-circuit includes：It is described
In the 8th resistance, the 9th resistance and the tenth resistance, the third transistor in triode set and optocoupler set in resistance set
The second optocoupler, wherein
One end of tenth resistance is connect with the 7th resistance, the other end ground connection of the tenth resistance, and the described 3rd 3
The base stage of pole pipe is connect with the tenth resistance, the emitter ground connection of the third transistor, the current collection of the third transistor
Pole is connect with second optocoupler, and one end of the 8th resistance is connect with external power supply, the other end of the 8th resistance with
The second optocoupler connection, the output end of second optocoupler are connect with one end of output pin and the 9th resistance respectively,
The other end of 9th resistance is grounded；
Wherein, second optocoupler includes：Single channel optocoupler or binary channels optocoupler.
4. circuit state diagnostic circuit according to claim 1, which is characterized in that the first switch, described second open
It closes and third switch includes：Triode or optocoupler.
5. circuit state diagnostic circuit according to claim 1, which is characterized in that first diode and described second
Diode includes：Anti-reverse diode, wherein the anti-reverse diode includes：Schottky diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721117096.5U CN207717932U (en) | 2017-09-01 | 2017-09-01 | Circuit state diagnostic circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721117096.5U CN207717932U (en) | 2017-09-01 | 2017-09-01 | Circuit state diagnostic circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207717932U true CN207717932U (en) | 2018-08-10 |
Family
ID=63063965
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721117096.5U Active CN207717932U (en) | 2017-09-01 | 2017-09-01 | Circuit state diagnostic circuit |
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| Country | Link |
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| CN (1) | CN207717932U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107607862A (en) * | 2017-09-01 | 2018-01-19 | 北京龙鼎源科技股份有限公司 | Circuit state diagnostic circuit and method |
| CN112702054A (en) * | 2020-12-22 | 2021-04-23 | 杭州和利时自动化有限公司 | Switching value input channel circuit and switching value receiving system |
-
2017
- 2017-09-01 CN CN201721117096.5U patent/CN207717932U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107607862A (en) * | 2017-09-01 | 2018-01-19 | 北京龙鼎源科技股份有限公司 | Circuit state diagnostic circuit and method |
| CN112702054A (en) * | 2020-12-22 | 2021-04-23 | 杭州和利时自动化有限公司 | Switching value input channel circuit and switching value receiving system |
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