CN108599872B - Anti-electromagnetic interference remote transmission method for analog quantity signal - Google Patents
Anti-electromagnetic interference remote transmission method for analog quantity signal Download PDFInfo
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- CN108599872B CN108599872B CN201810219668.3A CN201810219668A CN108599872B CN 108599872 B CN108599872 B CN 108599872B CN 201810219668 A CN201810219668 A CN 201810219668A CN 108599872 B CN108599872 B CN 108599872B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B15/00—Suppression or limitation of noise or interference
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C19/00—Electric signal transmission systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B15/00—Suppression or limitation of noise or interference
- H04B15/02—Reducing interference from electric apparatus by means located at or near the interfering apparatus
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/04—Control of transmission; Equalising
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Abstract
The anti-electromagnetic interference remote transmission method for analog quantity signals adopts two analog quantity signal output channels, two analog quantity signals are complementary twinborn, two paths of received analog quantity signals are subjected to numerical value processing of taking an average value, and the two paths of analog quantity signals are actually subjected to differential processing due to the complementary twinborn two paths of analog quantity signals. The anti-electromagnetic interference remote transmission method for the analog quantity signal is adopted to carry out remote transmission of the analog quantity signal, can obviously eliminate the influence of the electromagnetic interference signal in the transmission process of the analog quantity signal, avoids distortion and jumping of the transmitted analog quantity signal and ensures the remote transmission of the analog quantity signal.
Description
Technical Field
The invention relates to an anti-electromagnetic interference remote transmission method for analog quantity signals.
Background
At present, two modes of communication and hard wiring are generally adopted for remote transmission of analog quantity signals. Under the communication mode, if network congestion occurs in a communication line, packet loss is easy to occur, the transmission quality of analog quantity signals is seriously influenced, the requirements of real-time performance, accuracy and reliability cannot be met, and common communication quantity analog quantity signals are not applied to field equipment control; under the ordinary hard-wired mode, the remote transmission of analog quantity signals is easily influenced by electromagnetic interference of the surrounding environment, and particularly when strong electromagnetic field interference sources such as motors exist around, the remote transmission of analog quantity signals is easily distorted and generates a jump phenomenon.
Disclosure of Invention
The problem that the existing single analog quantity signal transmission is easy to distort and generate jump is solved. The invention provides an anti-electromagnetic interference remote transmission method for analog quantity signals.
The technical scheme adopted by the invention is as follows:
the anti-electromagnetic interference remote transmission method for analog quantity signals adopts two analog quantity signal output channels, two analog quantity signals are complementary twinborn, two paths of received analog quantity signals are subjected to numerical value processing of taking an average value, and the two paths of analog quantity signals are actually subjected to differential processing due to the complementary twinborn two paths of analog quantity signals.
The analog quantity signals in the invention not only comprise current signals of 4-20 mA or 0-20 mA and voltage signals of 0-5V which are commonly used, but also comprise continuously-changed analog quantity voltage and current signals of other specifications.
For 4-20 mA analog quantity signals, the two complementary twin analog quantity signals mean that the two analog quantity signals are added to be 20 mA;
for 0-20 mA analog quantity signals, the two complementary twin analog quantity signals mean that the two analog quantity signals are added to be 20 mA;
for 0-5V analog quantity signals, the two complementary twin analog quantity signals mean that the two analog quantity signals are added to be 5V.
And the two paths of analog quantity signals are transmitted by adopting different core wires in the same cable.
A remote transmission method of anti-electromagnetic interference analog quantity signals is applied to the transmission of speed regulator rotating speed analog quantity signals to a monitoring system LCU.
The anti-electromagnetic interference remote transmission method for the analog quantity signal is adopted to carry out remote transmission of the analog quantity signal, can obviously eliminate the influence of the electromagnetic interference signal in the transmission process of the analog quantity signal, avoids distortion and jumping of the transmitted analog quantity signal and ensures the remote transmission of the analog quantity signal.
Drawings
FIG. 1 is a schematic diagram of the remote transmission of the 4-20 mA output signal of the speed regulator in the invention.
Wherein: the system comprises a speed regulator disk cabinet PLC (programmable logic controller) 1, a monitoring system LCU disk cabinet PLC 2, a signal transmission cable 3, a 4-rotating speed signal f1, a 5-complementary twin rotating speed signal f2 of a rotating speed signal 1, an M-motor, a delta-motor and other electromagnetic interference signals released by strong electromagnetic field interference sources.
Detailed Description
The anti-electromagnetic interference remote transmission method for analog quantity signals adopts two analog quantity signal output channels, two analog quantity signals are complementary twinborn, two paths of received analog quantity signals are subjected to numerical value processing of taking an average value, and the two paths of analog quantity signals are actually subjected to differential processing due to the complementary twinborn two paths of analog quantity signals.
The analog quantity signals in the invention not only comprise current signals of 4-20 mA or 0-20 mA and voltage signals of 0-5V which are commonly used, but also comprise continuously-changed analog quantity voltage and current signals of other specifications.
For 4-20 mA analog quantity signals, the two complementary twin analog quantity signals mean that the two analog quantity signals are added to be 20 mA;
for 0-20 mA analog quantity signals, the two complementary twin analog quantity signals mean that the two analog quantity signals are added to be 20 mA;
for 0-5V analog quantity signals, the two complementary twin analog quantity signals mean that the two analog quantity signals are added to be 5V.
And the two paths of analog quantity signals are transmitted by adopting different core wires in the same cable.
An anti-electromagnetic interference remote transmission method for analog quantity signals is characterized in that: the speed regulator speed analog signal transmission method is applied to the transmission of speed regulator speed analog signals to a monitoring system LCU.
The invention will be further elucidated with reference to the figures and exemplary embodiments.
FIG. 1 is a schematic diagram of the long-distance transmission of 4-20 mA rotation speed output signals of the speed regulator. As shown in FIG. 1, the governor disc cabinet PLC 1 outputs a 4-20 mA rotation speed signal f1 through a first channel, and outputs a complementary twin rotation speed signal f2 of a 4-20 mA rotation speed signal f1 through a second channel, wherein f2=20mA-f 1. The signals are all transmitted to an analog input module of the monitoring system LCU by adopting different cores of the same cable, so that the external electromagnetic environment of two paths of signals is the same, the electromagnetic interference signals received by the signal transmission are consistent and are all delta, and the rotating speed signals acquired by the PLC 2 in the monitoring system LCU disk cabinet through the analog input module are respectively f1+ delta and f2+ delta.
In the exemplary embodiment of the invention, the analog quantity signal of the rotation speed signal acquired by the PLC controller 2 in the LCU disk cabinet of the monitoring system is k (f 1+ delta-4 mA), the analog quantity signal of the liquid level transmitter is k [20mA- (f 2+ delta) ], wherein k is the conversion transformation ratio of the rotation speed signal and the current signal, and the controller PLC acquires the analog quantity signal of { k (f 1+ delta-4 mA) + k [20mA- (f 2+ delta) ] }/2, namely k (16 mA + f1-f 2)/2 by adopting a numerical processing mode of averaging two paths of signals.
In the exemplary embodiment of the invention, the monitoring system LCU controller PLC acquires the electromagnetic interference signal delta item in the analog quantity signal final expression, so that the method can obviously eliminate the influence of the electromagnetic interference signal in the transmission process of the analog quantity signal, avoid the distortion and jump of the analog quantity signal acquired by measurement and ensure the long-distance transmission of the analog quantity signal.
Although the method of the present invention is described above with reference to an exemplary embodiment applied to a 4-20 mA speed analog quantity signal uploaded by a speed regulator, it will be understood by those skilled in the art that various changes can be made to the exemplary embodiment without departing from the scope of the claims, and the method is widely applied to 4-20 mA or 0-20 mA current signal and 0-5V voltage signal analog quantity signal transmission and other specifications of continuously-changing analog quantity voltage current signal transmission.
Claims (5)
1. An anti-electromagnetic interference remote transmission method for analog quantity signals is characterized in that: two analog quantity signal output channels are adopted, two analog quantity signals are in a complementary twinning state, the two received analog quantity signals are subjected to numerical value processing of taking an average value, and because the two analog quantity signals are in the complementary twinning state, the two analog quantity signals are actually subjected to differential processing;
for 4-20 mA analog quantity signals, the two complementary twin analog quantity signals mean that the two analog quantity signals are added to be 24 mA;
analog quantity signals of the rotation speed signals collected by the PLC (2) in the LCU disk cabinet of the monitoring system are k (f 1+ delta-4 mA) and k [20mA- (f 2+ delta) ], wherein: k is the conversion transformation ratio of the rotating speed signal and the current signal, a numerical processing mode of averaging two paths of signals is adopted, and the analog quantity signal collected by the controller PLC is { k (f 1 +. DELTA. -4 mA) + k [20mA- (f 2 +. DELTA) ] }/2, namely k (16 mA + f1-f 2)/2.
2. The method for remote transmission of anti-electromagnetic interference analog quantity signals according to claim 1, characterized in that: the analog quantity signals comprise commonly used current signals of 4-20 mA or 0-20 mA and voltage signals of 0-5V;
for 4-20 mA analog quantity signals, the two complementary twin analog quantity signals mean that the two analog quantity signals are added to be 24 mA;
for 0-20 mA analog quantity signals, the two complementary twin analog quantity signals mean that the two analog quantity signals are added to be 20 mA;
for 0-5V analog quantity signals, the two complementary twin analog quantity signals mean that the two analog quantity signals are added to be 5V.
3. The method for remote transmission of anti-electromagnetic interference analog quantity signals according to claim 1, characterized in that: and the two paths of analog quantity signals are transmitted by adopting different core wires in the same cable.
4. A method for remote transmission of anti-electromagnetic interference analog signals as claimed in claim 1, 2 or 3, characterized in that: the speed regulator speed analog signal transmission method is applied to the transmission of speed regulator speed analog signals to a monitoring system LCU.
5. A method for remotely transmitting a 4-20 mA rotating speed output signal of a speed regulator is characterized by comprising the following steps: the speed governor disc cabinet PLC controller (1) outputs a 4-20 mA rotating speed signal f1 through a first channel, outputs a complementary twin rotating speed signal f1 of a 4-20 mA rotating speed signal f2 through a second channel, and has f2=24mA-f 1;
different cores of the same cable are adopted to be transmitted to an analog input module of a monitoring system LCU, so that the same external electromagnetic environment of two paths of signals is ensured, electromagnetic interference signals received by signal transmission are consistent and are all delta, and a PLC (2) in a monitoring system LCU disk cabinet acquires rotation speed signals which are respectively f1+ delta and f2+ delta through the analog input module;
analog quantity signals of the rotation speed signals collected by the PLC (2) in the LCU disk cabinet of the monitoring system are k (f 1+ delta-4 mA) and k [20mA- (f 2+ delta) ], wherein: k is the conversion transformation ratio of the rotating speed signal and the current signal, a numerical processing mode of averaging two paths of signals is adopted, and the analog quantity signal collected by the controller PLC is { k (f 1 +. DELTA. -4 mA) + k [20mA- (f 2 +. DELTA) ] }/2, namely k (16 mA + f1-f 2)/2.
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| CN201810219668.3A CN108599872B (en) | 2018-03-16 | 2018-03-16 | Anti-electromagnetic interference remote transmission method for analog quantity signal |
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| CN108599872B true CN108599872B (en) | 2020-12-22 |
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| CN113110279B (en) * | 2021-04-20 | 2023-02-17 | 中国长江电力股份有限公司 | PLC analog output module for remote anti-electromagnetic interference transmission of analog signal |
| CN113237528B (en) * | 2021-04-20 | 2023-12-12 | 中国长江电力股份有限公司 | Analog quantity twin signal converter for long-distance anti-electromagnetic interference transmission |
| CN113110280B (en) * | 2021-04-20 | 2023-01-13 | 中国长江电力股份有限公司 | PLC analog quantity acquisition module for remote anti-electromagnetic interference transmission of analog quantity |
| CN113225140B (en) * | 2021-04-20 | 2022-09-16 | 中国长江电力股份有限公司 | Analog quantity twin signal receiver for remote anti-electromagnetic interference transmission of analog quantity signal |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN204086944U (en) * | 2014-07-08 | 2015-01-07 | 宁波安信数控技术有限公司 | A kind of analog quantity distance transmission system |
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| CN202230360U (en) * | 2011-08-01 | 2012-05-23 | 李遇浦 | Remote I/O control system for Modbus fieldbus DI-16-path monitor |
| CN105430788B (en) * | 2011-08-08 | 2019-06-18 | 夸克星有限责任公司 | Dimmable lighting equipment and the method that Dimmable lighting equipment is dimmed |
| CN104976954B (en) * | 2015-07-03 | 2018-01-16 | 南通远控自动化技术有限公司 | A kind of lock level monitoring system based on grating measuring |
| CN206649295U (en) * | 2017-04-24 | 2017-11-17 | 雅砻江流域水电开发有限公司 | speed regulator feedback signal measuring system |
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| CN204086944U (en) * | 2014-07-08 | 2015-01-07 | 宁波安信数控技术有限公司 | A kind of analog quantity distance transmission system |
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