CN201130324Y - Input circuit for digital quantity of DCS control system - Google Patents
Input circuit for digital quantity of DCS control system Download PDFInfo
- Publication number
- CN201130324Y CN201130324Y CNU2007202017479U CN200720201747U CN201130324Y CN 201130324 Y CN201130324 Y CN 201130324Y CN U2007202017479 U CNU2007202017479 U CN U2007202017479U CN 200720201747 U CN200720201747 U CN 200720201747U CN 201130324 Y CN201130324 Y CN 201130324Y
- Authority
- CN
- China
- Prior art keywords
- dcs control
- digital quantity
- control system
- input circuit
- module
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
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- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
The utility model discloses a digital quantity input circuit for DCS control system, which comprises a bypass capacitor (4) added to the input end of the DCS control system DI module (2); wherein one end of the bypass capacitor (4) is connected with the input end of the DI module (2) and the other end is earthed; the bypass capacitor (4) is 0.22uF to 250V and is connected with the DI module (2) in a DCS control terminal cabinet (1). Compared with the technical proposal which uses shielded cable to eliminate interference, the digital quantity input circuit has the advantages of greatly decreasing cost and capital investment saving; and compared with the technical proposal by using isolation relay to eliminate interference, the digital quantity input circuit has the advantages of reducing the cost, prolonging the service life, saving space in the DCS control terminal cabinet and indirectly improving the economic benefits. For all DI input of various control systems, the digital quantity input circuit can be adopted to eliminate the interference of the line-to-line induced voltage and avoid faulty DI input actions.
Description
Technical field
The utility model relates to a kind of DCS control system digital quantity input circuit.
Background technology
In commercial production, the digital quantity of DCS control system commonly used is imported (DI) circuit as shown in Figure 1, and the DI module 2 in the DCS control wiring cabinet 1 is connected to controlled device digital quantity contact 3 by common cable.Find in practice, if the digital quantity of DCS control system input (DI) circuit long (＞60m) time, can produce stronger " induced voltage between line " between cable.The size of " induced voltage between line " is directly proportional with Route Length.Detect line length 60 ~ 250m, induced voltage 60 ~ 140V.ac through the scene.This induced voltage has very big interference to the digital quantity input of DCS, makes the DI module produce misoperation, sends rub-out signal, has greatly reduced the reliability of total system, stability.According to practical experience, once adopted following scheme: 1. scheme one as shown in Figure 2, in DCS system control wiring cabinet, increase " disconnecting relay ", " induced voltage between line " and DI module input end are isolated, with the interference of blocking-up " induced voltage between line " to inputting modular unit.Because of " disconnecting relay " coil motion voltage is 220V.ac, so " induced voltage between line " is inoperative to it.2. scheme two substitutes the normal signal cable with shielded cable (screen is added up screen) as shown in Figure 3, cable two ends shielding layer grounding, so " induced voltage between line " is eliminated.Though above-mentionedly add disconnecting relay or use the circuit of shielded cable effective, the cost height, investment is big.
Summary of the invention
The technical problems to be solved in the utility model is: a kind of DCS control system digital quantity input circuit is provided, to solve the cost height that prior art exists, invests big deficiency.
The technical scheme that the utility model is taked is: add an electric capacity at the DI of DCS control system end, with " induction current between line " through capacitive bypass ground connection.Thereby eliminate " induced voltage between line " interference to system digits amount input (DI) module.
The technical solution of the utility model compares with the scheme that adopts shielded cable to eliminate interference, greatly reduces cost, has saved capital expenditure; Compare with the scheme that increases disconnecting relay elimination interference, advantage is to reduce cost, and has prolonged serviceable life, and can save the installing space in the DCS control wiring cabinet, increases economic efficiency indirectly.To the DI input of all kinds of control system, all can adopt the utility model to eliminate the interference of " induced voltage between line ", avoid the misoperation of DI input.
Description of drawings
Fig. 1 is a DCS control system digital quantity input circuit synoptic diagram basic in the prior art;
Fig. 2 is for adding the DCS control system digital quantity input circuit synoptic diagram of disconnecting relay in the prior art;
Fig. 3 is the DCS control system digital quantity input circuit synoptic diagram that substitutes the normal signal cable in the prior art with shielded cable (screen is added up screen);
Fig. 4 is a DCS control system digital quantity input circuit synoptic diagram of the present utility model.
Embodiment
Embodiment of the present utility model: circuit of the present utility model as shown in Figure 4, DI module 2 in the DCS control wiring cabinet 1 is connected to controlled device digital quantity contact 3 by common cable, input end at DI module 2 adds a bypass electric capacity 4, and specification is 0.22 μ F/250V.The input end of one termination DI module of shunt capacitance 4, other end ground connection is so that respond to " line capacitance " " induction current between line " bypass of generation.So greatly reduce " induced voltage between line " peak value (＜10V.ac), eliminated " induced voltage between line " interference to the input of DI module, avoided the misoperation of DI module.
Claims (3)
1. DCS control system digital quantity input circuit, it comprises the DI module (2) of DCS control system, it is characterized in that: the input end at the DI of DCS control system module (2) adds a bypass electric capacity (4), the input end of a termination DI module (2) of shunt capacitance (4), other end ground connection.
2. DCS control system digital quantity input circuit according to claim 1 is characterized in that: shunt capacitance (4) is connected with DI module (2) in DCS control wiring cabinet (1).
3. DCS control system digital quantity input circuit according to claim 1 is characterized in that: shunt capacitance (4) specification is 0.22 μ F/250V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007202017479U CN201130324Y (en) | 2007-12-24 | 2007-12-24 | Input circuit for digital quantity of DCS control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007202017479U CN201130324Y (en) | 2007-12-24 | 2007-12-24 | Input circuit for digital quantity of DCS control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201130324Y true CN201130324Y (en) | 2008-10-08 |
Family
ID=40018187
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007202017479U Expired - Fee Related CN201130324Y (en) | 2007-12-24 | 2007-12-24 | Input circuit for digital quantity of DCS control system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201130324Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106531271A (en) * | 2016-12-16 | 2017-03-22 | 中广核工程有限公司 | Nuclear power plant valve positioning system |
-
2007
- 2007-12-24 CN CNU2007202017479U patent/CN201130324Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106531271A (en) * | 2016-12-16 | 2017-03-22 | 中广核工程有限公司 | Nuclear power plant valve positioning system |
| CN106531271B (en) * | 2016-12-16 | 2018-04-27 | 中广核工程有限公司 | Nuclear power plant's valve alignment system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: GUIYANG ALUMINUM AND MAGNESIUM DESIGN INSTITUTE CO Free format text: FORMER NAME: GUIYANG ALUMINIUM AND MAGNESIUM DESIGN INST. |
|
| CP03 | Change of name, title or address |
Address after: 550081 Guiyang Province, Jinyang New District, Zhu Zhu Road, No. 2 Patentee after: Guiyang Aluminum & Magnesium Design Institute Co., Ltd. Address before: 550004 No. 208, Beijing Road, Guiyang, Guizhou Patentee before: Guiyang Aluminium and Magnesium Design Inst. |
|
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20081008 Termination date: 20131224 |