CN201084002Y - PLC digital quantity input interface circuit - Google Patents
PLC digital quantity input interface circuit Download PDFInfo
- Publication number
- CN201084002Y CN201084002Y CNU2007200443965U CN200720044396U CN201084002Y CN 201084002 Y CN201084002 Y CN 201084002Y CN U2007200443965 U CNU2007200443965 U CN U2007200443965U CN 200720044396 U CN200720044396 U CN 200720044396U CN 201084002 Y CN201084002 Y CN 201084002Y
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- photoelectrical coupler
- resistance
- circuit
- input interface
- light emitting
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Abstract
The utility model discloses a PLC digital quantity input interface circuit, which comprises a positive logic input interface and a negative logic input interface. The utility model is characterized in that: the positive logic input interface and the negative logic input interface comprise an external contact circuit, a signal input port circuit, a wire-breakage judging port circuit and a display circuit. The utility model can detect whether wire breakage exists upon contact without power or the input circuit of switching value such as a sensor of NPN open-collector output mode, thereby increasing the authenticity of detecting signal and the reliability of controlling the system. The utility model has the advantages of simple structure, reliable detect and strong practicality.
Description
Technical field
The utility model relates to the PLC field, a kind of specifically have whether exist broken string to carry out the PLC digital-quantity input interface circuit of measuring ability to the signal input line road.
Background technology
In the industrial control system, PLC is very general to the switching value signals collecting such as sensor of the passive contact or the NPN type open collector way of output.If the signal input line route in machinery pull, broken string appears in reasons such as circuit self is aging, the plague of rats, on-site signal can't send PLC to, then can not collect on-site signal correctly, in time, and fault is not easy to discover, and can reduce the authenticity of detection signal and the reliability of control system.
The utility model content
Whether the purpose of this utility model provides a kind of PLC digital-quantity input interface circuit, not only can gather contact information, and have and exist broken string to carry out measuring ability to the signal input line road.
The utility model can be achieved by following scheme.
A kind of PLC digital-quantity input interface circuit comprises the external contact circuit, positive logic input interface circuit, negative logic input interface circuit; It is characterized in that:
(1), the positive logic input interface circuit is made up of signal input port circuit, broken string judgement port circuit:
Described signal input port circuit comprises photoelectrical coupler U1, and the light emitting diode two ends of photoelectrical coupler U1 are parallel with resistance (R2); Light emitting diode one end of photoelectrical coupler U1 is in series the direct ground connection of the other end by resistance (R1) with input terminal B1; Input terminal B1 is in series by the base stage of a resistance (R3) with NPN type triode (Q1) simultaneously, the grounded emitter of NPN type triode (Q1), signal output part one tunnel series connection LED 1 of photoelectrical coupler U1, resistance (R6) connect operating voltage, and PLC inter-process circuit is inserted on another road;
Described broken string judges that port circuit comprises photoelectrical coupler U2, and the light emitting diode two ends of photoelectrical coupler U2 are parallel with resistance (R4); Light emitting diode one end of photoelectrical coupler U2 collector direct and NPN type triode (Q1) is in series, the other end is in series with power supply terminal A1 by resistance (R5), signal output part one tunnel series connection LED 2 of photoelectrical coupler U2, resistance (R7) connect operating voltage, and PLC inter-process circuit is inserted on another road;
(2), the negative logic input interface circuit is made up of signal input port circuit, broken string judgement port circuit:
Described signal input port circuit comprises photoelectrical coupler U1 ', and the light emitting diode two ends of photoelectrical coupler U1 ' are parallel with resistance (R2 '); Light emitting diode one end of photoelectrical coupler U1 ' inserts power supply terminal A2 by resistance (R1 '), another termination input terminal B2, input terminal B2 inserts positive-negative-positive triode Q1 ' base stage by resistance (R3 '), positive-negative-positive triode Q1 ' emitter connects operating voltage, the signal output part of photoelectrical coupler U1 ' is divided into two the tunnel, one the tunnel receives PLC inter-process circuit, another road series connection LED 1 ', resistance (R6 ') connects operating voltage;
Described broken string judges that port circuit comprises photoelectrical coupler U2 ', and the light emitting diode two ends of photoelectrical coupler U2 ' are parallel with resistance (R4 '); Light emitting diode one end of photoelectrical coupler U2 ' collector direct and positive-negative-positive triode (Q1 ') is in series, the other end is in series with ground terminal C2 by resistance (R5 '), signal output part one tunnel series connection LED 2 of photoelectrical coupler U2 ' ', resistance (R7 ') connects operating voltage, PLC inter-process circuit is inserted on another road;
(3), external contact circuit:
Described external contact circuit is for to be parallel to contact switch with a resistance, and the contact switch two ends are connected with two heart yearns respectively, if positive logic input interface two heart yearns insert its A1, B1 terminal; If negative logic input interface two heart yearns insert its B2, C2 terminal.
The utlity model has following beneficial effect:
Whether the utility model can exist broken string to detect the incoming line of the switching values such as sensor of the passive contact or the NPN type open collector way of output, increase the authenticity of detection signal and the reliability of control system, had characteristics such as simple in structure, that detection is reliable, practical.
Description of drawings
Fig. 1 is a schematic diagram of the present utility model.
Fig. 2 is positive logic input interface figure in the utility model.
Fig. 3 is negative logic input interface figure in the utility model.
Embodiment
See accompanying drawing.A kind of PLC digital-quantity input interface circuit comprises the external contact circuit, positive logic input interface circuit, negative logic input interface circuit; It is characterized in that:
(1), the positive logic input interface circuit is made up of signal input port circuit, broken string judgement port circuit:
Described signal input port circuit comprises photoelectrical coupler U1, and the light emitting diode two ends of photoelectrical coupler U1 are parallel with resistance (R2); Light emitting diode one end of photoelectrical coupler U1 is in series the direct ground connection of the other end by resistance (R1) with input terminal B1; Input terminal B1 is in series by the base stage of a resistance (R3) with NPN type triode (Q1) simultaneously, the grounded emitter of NPN type triode (Q1), signal output part one tunnel series connection LED 1 of photoelectrical coupler U1, resistance (R6) connect operating voltage, and PLC inter-process circuit is inserted on another road;
Described broken string judges that port circuit comprises photoelectrical coupler U2, and the light emitting diode two ends of photoelectrical coupler U2 are parallel with resistance (R4); Light emitting diode one end of photoelectrical coupler U2 collector direct and NPN type triode (Q1) is in series, the other end is in series with power supply terminal A1 by resistance (R5), signal output part one tunnel series connection LED 2 of photoelectrical coupler U2, resistance (R7) connect operating voltage, and PLC inter-process circuit is inserted on another road;
(2), the negative logic input interface circuit is made up of signal input port circuit, broken string judgement port circuit:
Described signal input port circuit comprises photoelectrical coupler U1 ', and the light emitting diode two ends of photoelectrical coupler U1 ' are parallel with resistance (R2 '); Light emitting diode one end of photoelectrical coupler U1 ' inserts power supply terminal A2 by resistance (R1 '), another termination input terminal B2, input terminal B2 inserts positive-negative-positive triode Q1 ' base stage by resistance (R3 '), positive-negative-positive triode Q1 ' emitter connects operating voltage, the signal output part of photoelectrical coupler U1 ' is divided into two the tunnel, one the tunnel receives PLC inter-process circuit, another road series connection LED 1 ', resistance (R6 ') connects operating voltage;
Described broken string judges that port circuit comprises photoelectrical coupler U2 ', and the light emitting diode two ends of photoelectrical coupler U2 ' are parallel with resistance (R4 '); Light emitting diode one end of photoelectrical coupler U2 ' collector direct and positive-negative-positive triode (Q1 ') is in series, the other end is in series with ground terminal C2 by resistance (R5 '), signal output part one tunnel series connection LED 2 of photoelectrical coupler U2 ' ', resistance (R7 ') connects operating voltage, PLC inter-process circuit is inserted on another road;
(3), external contact circuit:
Described external contact circuit is for to be parallel to contact switch with a resistance, and the contact switch two ends are connected with two heart yearns respectively, and wherein a core assembly line is used to insert A1, the B1 terminal of positive logic input interface circuit; Another core assembly line is used to insert B2, the C2 terminal of negative logic input interface circuit.
If the PLC input interface that connects is that positive logic is imported, then the external contact circuit inserts the positive logic input interface circuit; If the PLC input interface that connects is that negative logic is imported, the external contact circuit inserts the negative logic input interface circuit.
Whether the signal input port circuit is used to detect on-the-spot contact switch closed.When the external contact switch did not have closure, the not conducting of photoelectrical coupler of signal input port sent noble potential of PLC inter-process circuit to, and the expression signal input port does not have the signal input; When the external contact switch closure, the photoelectrical coupler conducting of signal input port sends electronegative potential of PLC inter-process circuit to, and the expression signal input port has the signal input.Externally a contact switch resistance in parallel can not change the state (conducting or by) of signal input port.
The burn out detection port is used for the detection signal incoming line and whether has broken string.When incoming line does not break, even external contact does not have closure, by parallel resistor R, also there is Weak current to flow through on the circuit, make triode Q1/Q1 ' saturation conduction, photoelectrical coupler U2/U2 ' conducting flows to electronegative potential of PLC inter-process circuit, expression has the signal input, and not broken string of incoming line is described; When broken string took place incoming line, triode Q1/Q1 ' ended, and photoelectrical coupler U2/U2 ' ends, and flows to noble potential of PLC inter-process circuit, and expression does not have the signal input, illustrated that there is broken string in incoming line.
For the positive logic input interface, when incoming line does not break, even (S) do not have closure in the contact, by resistance (R), also there is Weak current to flow through on the circuit, input end B2 has certain voltage (this voltage hangs down can not make photoelectrical coupler U1 conducting), triode Q1 saturation conduction, the light emitting diode of photoelectrical coupler U2 is bright, the phototriode saturation conduction, flows to electronegative potential of PLC inter-process circuit, and expression has the signal input; When broken string took place circuit, input end B2 current potential was 0V, and triode Q1 ends, and the light emitting diode of photoelectrical coupler U2 goes out, and phototriode ends, and flows to noble potential of PLC inter-process circuit, and expression does not have the signal input.
For the negative logic input interface, when incoming line does not break,, pass through resistance R even contact (S) do not have closure, also there is Weak current to flow through on the circuit, input end B2 voltage is lower than VCC (this voltage and VCC are more or less the same, and can not make photoelectrical coupler U1 ' conducting), triode Q1 ' saturation conduction, the light emitting diode of photoelectrical coupler U2 ' is bright, the phototriode saturation conduction flows to electronegative potential of PLC inter-process circuit, and expression has the signal input; When broken string took place circuit, input end B2 current potential was VCC, and triode Q1 ' ends, and the light emitting diode of photoelectrical coupler U2 ' goes out, and phototriode ends, and flows to noble potential of PLC inter-process circuit, and expression does not have the signal input.
Resistance R 7/R7 ' and LED 2/LED2 ' composition burn out detection indicating circuit, when circuit did not break, LED 1/LED1 ' was bright; When broken string took place, LED 1/LED1 ' went out.
Resistance R 1/R1 ', R5/R5 ' are the current-limiting resistance of photoelectrical coupler light emitting diode, and the different corresponding resistances of input voltage are also different, change the size that its resistance can be controlled the photoelectrical coupler led current; Resistance R 2/R2 ', R4/R4 ' play anti-interference effect, make undesired signal be unlikely to make the photoelectrical coupler light emitting diode bright.
Claims (1)
1. a PLC digital-quantity input interface circuit comprises the external contact circuit, positive logic input interface circuit, negative logic input interface circuit; It is characterized in that:
(1), the positive logic input interface circuit is made up of signal input port circuit, broken string judgement port circuit:
Described signal input port circuit comprises photoelectrical coupler U1, and the light emitting diode two ends of photoelectrical coupler U1 are parallel with resistance (R2); Light emitting diode one end of photoelectrical coupler U1 is in series the direct ground connection of the other end by resistance (R1) with input terminal B1; Input terminal B1 is in series by the base stage of a resistance (R3) with NPN type triode (Q1) simultaneously, the grounded emitter of NPN type triode (Q1), signal output part one tunnel series connection LED 1 of photoelectrical coupler U1, resistance (R6) connect operating voltage, and PLC inter-process circuit is inserted on another road;
Described broken string judges that port circuit comprises photoelectrical coupler U2, and the light emitting diode two ends of photoelectrical coupler U2 are parallel with resistance (R4); Light emitting diode one end of photoelectrical coupler U2 collector direct and NPN type triode (Q1) is in series, the other end is in series with power supply terminal A1 by resistance (R5), signal output part one tunnel series connection LED 2 of photoelectrical coupler U2, resistance (R7) connect operating voltage, and PLC inter-process circuit is inserted on another road;
(2), the negative logic input interface circuit is made up of signal input port circuit, broken string judgement port circuit:
Described signal input port circuit comprises photoelectrical coupler U1 ', and the light emitting diode two ends of photoelectrical coupler U1 ' are parallel with resistance (R2 '); Light emitting diode one end of photoelectrical coupler U1 ' inserts power supply terminal A2 by resistance (R1 '), another termination input terminal B2, input terminal B2 inserts positive-negative-positive triode Q1 ' base stage by resistance (R3 '), positive-negative-positive triode Q1 ' emitter connects operating voltage, the signal output part of photoelectrical coupler U1 ' is divided into two the tunnel, one the tunnel receives PLC inter-process circuit, another road series connection LED 1 ', resistance (R6 ') connects operating voltage;
Described broken string judges that port circuit comprises photoelectrical coupler U2 ', and the light emitting diode two ends of photoelectrical coupler U2 ' are parallel with resistance (R4 '); Light emitting diode one end of photoelectrical coupler U2 ' collector direct and positive-negative-positive triode (Q1 ') is in series, the other end is in series with ground terminal C2 by resistance (R5 '), signal output part one tunnel series connection LED 2 of photoelectrical coupler U2 ' ', resistance (R7 ') connects operating voltage, PLC inter-process circuit is inserted on another road;
(3), external contact circuit:
Described external contact circuit is for to be parallel to contact switch with a resistance, and the contact switch two ends are connected with two heart yearns respectively, if positive logic input interface two heart yearns insert its A1, B1 terminal; If negative logic input interface two heart yearns insert its B2, C2 terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200443965U CN201084002Y (en) | 2007-09-30 | 2007-09-30 | PLC digital quantity input interface circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200443965U CN201084002Y (en) | 2007-09-30 | 2007-09-30 | PLC digital quantity input interface circuit |
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| CN201084002Y true CN201084002Y (en) | 2008-07-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNU2007200443965U Expired - Fee Related CN201084002Y (en) | 2007-09-30 | 2007-09-30 | PLC digital quantity input interface circuit |
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| CN (1) | CN201084002Y (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101907872A (en) * | 2010-08-19 | 2010-12-08 | 王惠云 | Programmable logic application controller |
| CN102118154A (en) * | 2011-01-13 | 2011-07-06 | 西北工业大学 | Bilateral input/output port circuit |
| CN102467106A (en) * | 2010-11-15 | 2012-05-23 | 深圳市合信自动化技术有限公司 | Programmable logic controller (PLC) digital input control device and control method |
| CN103124937A (en) * | 2010-09-27 | 2013-05-29 | 三菱电机株式会社 | Programmable control system |
| CN103279160A (en) * | 2013-06-08 | 2013-09-04 | 哈尔滨工业大学 | High-accuracy current signal regulating circuit |
| CN103580671A (en) * | 2013-10-24 | 2014-02-12 | 秦皇岛博硕光电设备股份有限公司 | NPN/PNP on-off signal converter |
| CN104597822A (en) * | 2013-10-31 | 2015-05-06 | 施耐德电器工业公司 | Digital input line break detection method and circuit |
| CN107247635A (en) * | 2017-05-16 | 2017-10-13 | 北京龙鼎源科技股份有限公司 | Stability of a system acquisition methods and device |
| CN110568296A (en) * | 2019-10-08 | 2019-12-13 | 安徽新境界自动化技术有限公司 | Digital quantity sensor signal detection device |
-
2007
- 2007-09-30 CN CNU2007200443965U patent/CN201084002Y/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101907872A (en) * | 2010-08-19 | 2010-12-08 | 王惠云 | Programmable logic application controller |
| CN103124937A (en) * | 2010-09-27 | 2013-05-29 | 三菱电机株式会社 | Programmable control system |
| CN102467106A (en) * | 2010-11-15 | 2012-05-23 | 深圳市合信自动化技术有限公司 | Programmable logic controller (PLC) digital input control device and control method |
| CN102467106B (en) * | 2010-11-15 | 2014-06-04 | 深圳市合信自动化技术有限公司 | Programmable logic controller (PLC) digital input control device and control method |
| CN102118154A (en) * | 2011-01-13 | 2011-07-06 | 西北工业大学 | Bilateral input/output port circuit |
| CN103279160A (en) * | 2013-06-08 | 2013-09-04 | 哈尔滨工业大学 | High-accuracy current signal regulating circuit |
| CN103580671A (en) * | 2013-10-24 | 2014-02-12 | 秦皇岛博硕光电设备股份有限公司 | NPN/PNP on-off signal converter |
| CN103580671B (en) * | 2013-10-24 | 2017-09-19 | 秦皇岛博硕光电设备股份有限公司 | NPN/PNP on-off model converters |
| CN104597822A (en) * | 2013-10-31 | 2015-05-06 | 施耐德电器工业公司 | Digital input line break detection method and circuit |
| CN107247635A (en) * | 2017-05-16 | 2017-10-13 | 北京龙鼎源科技股份有限公司 | Stability of a system acquisition methods and device |
| CN110568296A (en) * | 2019-10-08 | 2019-12-13 | 安徽新境界自动化技术有限公司 | Digital quantity sensor signal detection device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080709 Termination date: 20100930 |