CN104422537A - Temperature signal acquisition circuit of PLC control system - Google Patents
Temperature signal acquisition circuit of PLC control system Download PDFInfo
- Publication number
- CN104422537A CN104422537A CN201310376592.2A CN201310376592A CN104422537A CN 104422537 A CN104422537 A CN 104422537A CN 201310376592 A CN201310376592 A CN 201310376592A CN 104422537 A CN104422537 A CN 104422537A
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- coupler
- photo
- optical coupler
- series
- circuit
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Abstract
Disclosed in the invention is a temperature signal acquisition circuit of a PLC control system. The temperature signal acquisition circuit consists of a resistor, two adjustable resistors, four optical couplers, two constant-current tubes, and a comparator. The input terminal of the resistor is connected in series to a sampling circuit input terminal; and the output terminal of the resistor is connected to 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 circuit; the third optical coupler and the fourth optical coupler are connected in series to form a second series circuit; and the first series circuit and the second series circuit are connected in parallel. Collectors of the first optical coupler and the third optical coupler are connected to the anode of the comparator; and collectors of the second optical coupler and the fourth optical coupler are connected to the cathode of the comparator. Emitters of the first optical coupler, the second optical coupler, the third optical coupler, and the fourth optical coupler are connected in series and then are grounded. According to the invention, the temperature signal acquisition circuit has the outstanding effects of simpleness and high reliability.
Description
Technical field
The invention belongs to program control system field, especially a kind of temperature signal collection 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 temperature signal collection circuit being applicable to PLC control system.
Object of the present invention will be achieved by the following technical programs:
A temperature signal collection circuit for PLC control system, by resistance, the first adjustable resistance, the second adjustable resistance, the first photo-coupler, the second photo-coupler, the 3rd photo-coupler, the 4th photo-coupler, and two constant current tubes and comparer composition; Described resistance input end is connected serially to sample circuit input end, and 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 access comparer positive pole of described first photo-coupler and the 3rd photo-coupler, the collector access comparer negative pole of described second photo-coupler and the 4th photo-coupler; The emitter of described first photo-coupler, the second photo-coupler, the 3rd photo-coupler, the 4th photo-coupler is connected then ground connection.
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 temperature signal collection circuit figure of the present invention.
Embodiment
As shown in Figure 1, the temperature signal collection circuit of a kind of PLC control system of the present embodiment, by resistance R1, first adjustable resistance PT100, second adjustable resistance PT100, first photo-coupler OP1, the second photo-coupler OP2, the 3rd photo-coupler OP3, the 4th photo-coupler OP4, and two constant current tubes and comparer composition;
Described resistance R1 input end is connected serially to sample circuit input end VCC, and 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 access comparer positive pole of described first photo-coupler OP1 and the 3rd photo-coupler OP3, the collector access comparer negative pole of described second photo-coupler OP2 and the 4th photo-coupler OP4; The emitter series connection PT100 then ground connection of described first photo-coupler OP1, the second photo-coupler OP2, the 3rd photo-coupler OP3, the 4th photo-coupler OP4.
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 temperature signal collection circuit of a PLC control system, it is characterized in that: by resistance (R1), first adjustable resistance (PT100), second adjustable resistance (PT100), first photo-coupler (OP1), the second photo-coupler (OP2), the 3rd photo-coupler (OP3), the 4th photo-coupler (OP4), and two constant current tubes and comparer composition;
Described resistance (R1) input end is connected serially to sample circuit input end (VCC), and resistance (R1) output terminal connects the first photo-coupler (OP1) and the 3rd photo-coupler (0P3);
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 access comparer positive pole of described first photo-coupler (OP1) and the 3rd photo-coupler (OP3), the collector access comparer negative pole of described second photo-coupler (OP2) and the 4th photo-coupler (OP4); The emitter series connection PT100 then ground connection of described first photo-coupler (OP1), the second photo-coupler (OP2), the 3rd photo-coupler (OP3), the 4th photo-coupler (OP4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310376592.2A CN104422537A (en) | 2013-08-19 | 2013-08-19 | Temperature signal acquisition circuit of PLC control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310376592.2A CN104422537A (en) | 2013-08-19 | 2013-08-19 | Temperature signal acquisition circuit of PLC control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104422537A true CN104422537A (en) | 2015-03-18 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310376592.2A Pending CN104422537A (en) | 2013-08-19 | 2013-08-19 | Temperature signal acquisition circuit of PLC control system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104422537A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105955189A (en) * | 2016-06-29 | 2016-09-21 | 歌尔股份有限公司 | Foolproof protection module and automated machine platform |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002357484A (en) * | 2001-06-04 | 2002-12-13 | Hitachi Ltd | Programmable controller, resistance thermometer element input module for it, and method and program for forming temperature measurement signal |
| CN101105412A (en) * | 2007-05-23 | 2008-01-16 | 深圳市合信自动化技术有限公司 | PLC system and its temperature measurement and control expansion module, its implement method |
| CN102385339A (en) * | 2011-09-22 | 2012-03-21 | 苏州能健电气有限公司 | Programmable logic controller (PLC) controlling system and temperature signal collection circuit thereof |
| 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 |
-
2013
- 2013-08-19 CN CN201310376592.2A patent/CN104422537A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002357484A (en) * | 2001-06-04 | 2002-12-13 | Hitachi Ltd | Programmable controller, resistance thermometer element input module for it, and method and program for forming temperature measurement signal |
| CN101105412A (en) * | 2007-05-23 | 2008-01-16 | 深圳市合信自动化技术有限公司 | PLC system and its temperature measurement and control expansion module, its implement method |
| CN102385339A (en) * | 2011-09-22 | 2012-03-21 | 苏州能健电气有限公司 | Programmable logic controller (PLC) controlling system and temperature signal collection circuit thereof |
| 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 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105955189A (en) * | 2016-06-29 | 2016-09-21 | 歌尔股份有限公司 | Foolproof protection module and automated machine platform |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150318 |
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| WD01 | Invention patent application deemed withdrawn after publication |