CN104345679A - Analog signal sampling circuit of PLC (programmable logic controller) control system - Google Patents
Analog signal sampling circuit of PLC (programmable logic controller) control system Download PDFInfo
- Publication number
- CN104345679A CN104345679A CN201310356286.2A CN201310356286A CN104345679A CN 104345679 A CN104345679 A CN 104345679A CN 201310356286 A CN201310356286 A CN 201310356286A CN 104345679 A CN104345679 A CN 104345679A
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- China
- Prior art keywords
- coupler
- photo
- optical coupler
- series
- resistance
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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
- G05B19/05—Programmable logic controllers, e.g. simulating logic interconnections of signals according to ladder diagrams or function charts
- G05B19/054—Input/output
Abstract
The invention discloses an analog signal sampling circuit of a PLC (programmable logic controller) control system. The analog signal sampling circuit consists of three resistors, four optical couplers and one comparer, wherein the input end of the first resistor is connected in series to the input end of the sampling circuit, the output end of the first resistor is connected with the first optical coupler and the third optical coupler, the first optical coupler and the second optical coupler are connected in series to form a first series connection circuit, the third optical coupler and the fourth optical coupler are connected in series to form a second series connection circuit, the two series connection circuits are connected in parallel, a collector electrode of the first optical coupler, an emitting electrode of the second optical coupler and an emitting electrode of the fourth optical coupler are externally connected with the forward voltage and are connected in series to a negative electrode of the comparer, an emitting electrode of the first optical coupler and an emitting electrode of the fourth optical coupler are simultaneously connected in series with the positive electrode of the comparer, and the second resistor and the third resistor are respectively connected in series with the collector electrodes of the first optical coupler and the third optical coupler. The analog signal sampling circuit has the prominent effects of simplicity and reliability.
Description
Technical field
The invention belongs to program control system field, especially a kind of simulating signal sample circuit of PLC control system.
Background technology
At present, in wind power pitch-controlled system, main or dependence PLC realizes the overall control to system, conventional PLC control system as shown in Figure 1, comprises CPU module, coder module, analog output module, digital quantity input module, Analog input mModule and digital output module.
Summary of the invention
In view of the defect that above-mentioned prior art exists, the object of the invention is to propose a kind of simulating signal sample circuit being applicable to PLC control system.
Object of the present invention will be achieved by the following technical programs:
A simulating signal sample circuit for PLC control system, by the first resistance, the second resistance, the 3rd resistance, the first photo-coupler, the second photo-coupler, the 3rd photo-coupler, the 4th photo-coupler, and a comparer composition;
Described first resistance input end is connected serially to sample circuit input end, and the first resistance output terminal connects the first photo-coupler and the 3rd photo-coupler;
Described first photo-coupler and the second photo-coupler are connected into the first series circuit;
Described 3rd photo-coupler and the 4th photo-coupler are connected into the second series circuit;
Described first series circuit and the parallel connection of the second series circuit;
The collector of described first photo-coupler, and the external forward voltage of emitter of described second photo-coupler and the 4th photo-coupler be connected serially to the negative pole of described comparer;
The emitter of described first photo-coupler, the emitter of the 4th photo-coupler is connected the positive pole of described comparer simultaneously;
Described second resistance, the 3rd resistance are connected on the collector of described first photo-coupler and described 3rd photo-coupler respectively.
Outstanding effect of the present invention is: simple, reliably.
Below just accompanying drawing in conjunction with the embodiments, is described in further detail the specific embodiment of the present invention, is easier to understand, grasp to make technical solution of the present invention.
Accompanying drawing explanation
Fig. 1 is simulating signal sample circuit figure of the present invention.
Embodiment
As shown in Figure 1, the simulating signal sample circuit of PLC control system, it is characterized in that: by the first resistance R1, the second resistance R2, the 3rd resistance R3, the first photo-coupler OP1, the second photo-coupler OP2, the 3rd photo-coupler OP3, the 4th photo-coupler OP4, and a comparer composition;
Described first resistance R1 input end is connected serially to sample circuit input end VCC, and the first resistance R1 output terminal connects the first photo-coupler OP1 and the 3rd photo-coupler OP3;
Described first photo-coupler OP1 and the second photo-coupler OP2 is connected into the first series circuit;
Described 3rd photo-coupler OP3 and the 4th photo-coupler OP4 is connected into the second series circuit;
Described first series circuit and the parallel connection of the second series circuit;
The collector of described first photo-coupler OP1, and the external forward voltage of emitter of described second photo-coupler OP2 and the 4th photo-coupler OP4 be connected serially to the negative pole of described comparer;
The emitter of described first photo-coupler OP1, the emitter of the 4th photo-coupler OP4 is connected the positive pole of described comparer simultaneously;
Described second resistance R2, the 3rd resistance R3 are connected on the collector of described first photo-coupler OP1 and described 3rd photo-coupler OP3 respectively.
The present invention still has numerous embodiments, all employing equivalents or equivalent transformation and all technical schemes formed, and all drops within protection scope of the present invention.
Claims (1)
1. the simulating signal sample circuit of a PLC control system, it is characterized in that: by the first resistance (R1), the second resistance (R2), the 3rd resistance (R3), first photo-coupler (OP1), the second photo-coupler (OP2), the 3rd photo-coupler (OP3), the 4th photo-coupler (OP4), and a comparer composition;
Described first resistance (R1) input end is connected serially to sample circuit input end (VCC), and the first resistance (R1) output terminal connects the first photo-coupler (OP1) and the 3rd photo-coupler (OP3);
Described first photo-coupler (OP1) and the second photo-coupler (OP2) are connected into the first series circuit;
Described 3rd photo-coupler (OP3) and the 4th photo-coupler (OP4) are connected into the second series circuit;
Described first series circuit and the parallel connection of the second series circuit;
The collector of described first photo-coupler (OP1), and the external forward voltage of emitter of described second photo-coupler (OP2) and the 4th photo-coupler (OP4) be connected serially to the negative pole of described comparer;
The emitter of described first photo-coupler (OP1), the emitter of the 4th photo-coupler (OP4) is connected the positive pole of described comparer simultaneously;
Described second resistance (R2), the 3rd resistance (R3) are connected on the collector of described first photo-coupler (OP1) and described 3rd photo-coupler (OP3) respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310356286.2A CN104345679A (en) | 2013-08-09 | 2013-08-09 | Analog signal sampling circuit of PLC (programmable logic controller) control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310356286.2A CN104345679A (en) | 2013-08-09 | 2013-08-09 | Analog signal sampling circuit of PLC (programmable logic controller) control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104345679A true CN104345679A (en) | 2015-02-11 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310356286.2A Pending CN104345679A (en) | 2013-08-09 | 2013-08-09 | Analog signal sampling circuit of PLC (programmable logic controller) control system |
Country Status (1)
| Country | Link |
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| CN (1) | CN104345679A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201820667U (en) * | 2010-07-13 | 2011-05-04 | 浙江吉利汽车研究院有限公司 | Switching device with fault self-detection function |
| CN102385340A (en) * | 2011-09-22 | 2012-03-21 | 苏州能健电气有限公司 | Programmable logic controller (PLC) controlling system and signal collection circuit thereof |
| CN102384025A (en) * | 2011-09-22 | 2012-03-21 | 苏州能健电气有限公司 | Programmable logic control (PLC) control system |
| CN101968639B (en) * | 2010-11-02 | 2012-08-22 | 上海电器科学研究院 | Analog quantity acquisition module for programmable logic controller (PLC) extension |
| CN203338077U (en) * | 2013-08-09 | 2013-12-11 | 苏州能健电气有限公司 | Analog signal sampling circuit of PLC control system |
-
2013
- 2013-08-09 CN CN201310356286.2A patent/CN104345679A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201820667U (en) * | 2010-07-13 | 2011-05-04 | 浙江吉利汽车研究院有限公司 | Switching device with fault self-detection function |
| CN101968639B (en) * | 2010-11-02 | 2012-08-22 | 上海电器科学研究院 | Analog quantity acquisition module for programmable logic controller (PLC) extension |
| CN102385340A (en) * | 2011-09-22 | 2012-03-21 | 苏州能健电气有限公司 | Programmable logic controller (PLC) controlling system and signal collection circuit thereof |
| CN102384025A (en) * | 2011-09-22 | 2012-03-21 | 苏州能健电气有限公司 | Programmable logic control (PLC) control system |
| CN203338077U (en) * | 2013-08-09 | 2013-12-11 | 苏州能健电气有限公司 | Analog signal sampling circuit of PLC control system |
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| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150211 |