CN109613882A - A kind of anti-interference processing method of signal terminal transmission process - Google Patents
A kind of anti-interference processing method of signal terminal transmission process Download PDFInfo
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- CN109613882A CN109613882A CN201811491887.3A CN201811491887A CN109613882A CN 109613882 A CN109613882 A CN 109613882A CN 201811491887 A CN201811491887 A CN 201811491887A CN 109613882 A CN109613882 A CN 109613882A
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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
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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
- G05B2219/00—Program-control systems
- G05B2219/10—Plc systems
- G05B2219/11—Plc I-O input output
- G05B2219/1163—Multiplexer for analog signals
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
The invention discloses a kind of anti-interference processing methods of signal terminal transmission process, include the following steps: step 1: all ground wire terminals are connected with close grounding point；Step 2: power supply required for core cpu component is handled using multiple-stage filtering；Step 3: power-supply system is separately designed using analog power and digital power；Step 4: useful signal authenticity is improved using software digital filter；Step 5: semiconductor devices modulating transformation is passed through to signal-transmitting cable output end；Step 6: to the shielded layer parallel connection potential balance line of signal-transmitting cable shielding line, and shielded layer two-terminal-grounding；Step 7: judge whether signal output terminal is connected to inductive load；Step 8: judge inductive load property.The present invention solves High-frequency Interference by the shielded layer parallel connection potential balance line to signal-transmitting cable shielding line, and by reaching inhibition low-frequency disturbance to shielded layer two-terminal-grounding, solves the signal interference between PLC and intermediate detection device.
Description
Technical field
The present invention relates to signal processing technology field, specially a kind of anti-interference process side of signal terminal transmission process
Method.
Background technique
High reliability is the key performance of electrical control equipment.PLC is due to adopting using modern large scale integrated circuit technology
It is manufactured with stringent production technology, internal circuit takes advanced Anti-Jamming Technique, has very high reliability.Failure is also
It substantially reduces.Although PLC has taken many measures when manufacturing and designing, it is made to compare adaptation to industrial environment, in order to
Ensure that whole system is reliable and stable, still PLC should be made as far as possible to have good working environment, and takes necessary anti-interference
Measure.
For transmission terminal between sensor and PLC, existing anti-interference processing method is between sensor and PLC
Design installation isolator, realizes the anti-interference of analog signal transmission.But in actual use, if between sensor and PLC
Design has intermediate detection device such as secondary instrument etc., although then only can only inhibit the interference between PLC and secondary instrument by former technology
Signal, but the interference signal between sensor and secondary instrument can not be effectively treated.
Summary of the invention
The purpose of the present invention is to provide a kind of anti-interference processing methods of signal terminal transmission process, to solve background skill
The problem of art proposes.
To achieve the above object, the invention provides the following technical scheme: a kind of anti-interference place of signal terminal transmission process
Reason method, includes the following steps:
Step 1: all ground wire terminals are connected with close grounding point；
Step 2: to+5V power supply required for core cpu component using multiple-stage filtering handle, and with integrated adjuster into
Row adjustment, power supply line use twisted pair and parallel cabling；
Step 3: the power-supply system of signal terminal is separately designed using analog power and digital power, is inputted in analog power
Series connection isolating transformer before end, in the vdd terminal and the end GND parallel connection decoupling capacitor of digital power；
Step 4: improving useful signal authenticity using software digital filter, for there is the system of significantly random disturbances, adopts
With program margining amplitude technique, continuous sampling 5 times, if the amplitude sampled several times much larger than other is supported in certain primary sampling, then taking with regard to house
It；
Step 5: to signal-transmitting cable output end by semiconductor devices modulating transformation, then by magnetic strength device carry out every
From conversion, finally carries out demodulation and be transformed back to original signal before isolation, while the power supply of signal after isolation is carried out at isolation
Reason；
Step 6: to the shielded layer parallel connection potential balance line of signal-transmitting cable shielding line, and shielded layer two-terminal-grounding；
Step 7: judging whether signal output terminal is connected to inductive load, if nothing, ends processing, if so, continuing to execute next
Step；
Step 8: judging inductive load property, if inductive load is DC load, in coil both ends parallel connection freewheeling diode, if
Inductive load is AC load, in coil both ends parallel connection RC absorbing circuit.
Preferably, in step 1: the ground connection cross-sectional area that the ground wire terminal uses is not less than 2 mm2, and use cable
Pipe laying ground line, when ground resistance is not more than 100 Ω, ground line uses dedicated ground wire.
Preferably, in step 1: when the signal frequency of the ground wire terminal is lower than 10 MHz, using one point earth, ground wire
When the signal of terminal is higher than 10 MHz, using multipoint earthing.
Preferably, in step 3: the isolating transformer uses 10 μ F inductance.
Preferably, in step 3: the decoupling capacitor is formed in parallel using ten 80 nF capacitors, and ten 80 nF are equal
For polycarbonate capacitor.
Preferably, in step 6: the resistance value of the potential balance line is less than the 1/10 of shielded layer shielding resistance.
Preferably, in step 8: the diode uses silicon diode, and its forward current is 1 A.
Preferably, in step 8: if AC load capacity is not higher than 10 VA, capacitor takes 0.1- in the RC absorbing circuit
0.2 μ F, resistance take 100-140 Ω, if AC load capacity is higher than 10 VA, capacitor takes 0.4-0.5 in the RC absorbing circuit
μ F, resistance take 40-60 Ω.
Compared with prior art, the beneficial effects of the present invention are:
1, the present invention is by being grounded ground wire terminal, inhibits the electromagnetic interference for being attached to power supply output, input terminal, and by
It connects before analog power input terminal isolating transformer, realizes low-pass filtering；
2, for the present invention by the vdd terminal and the end GND parallel connection decoupling capacitor in digital power, realization filters out high frequency noise, and leads to
It crosses to signal-transmitting cable output end through semiconductor devices modulating transformation, isolation conversion is then carried out by magnetic strength device, most
After carry out demodulation and be transformed back to original signal before isolation, guarantee transformed signal, power supply, between it is absolutely independent；
3, the present invention solves High-frequency Interference by the shielded layer parallel connection potential balance line to signal-transmitting cable shielding line, and leads to
It crosses to shielded layer two-terminal-grounding, reaches inhibition low-frequency disturbance, solve the signal interference between PLC and intermediate detection device.
Specific embodiment
Below in conjunction with the embodiment of the present invention, technical scheme in the embodiment of the invention is clearly and completely described,
Obviously, described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based in the present invention
Embodiment, every other embodiment obtained by those of ordinary skill in the art without making creative efforts, all
Belong to the scope of protection of the invention.
Embodiment one
A kind of anti-interference processing method of signal terminal transmission process, includes the following steps:
Step 1: all ground wire terminals are connected with close grounding point, and the ground connection cross-sectional area that ground wire terminal uses is 2
mm2, ground resistance be 100 Ω when, ground line use dedicated ground wire, and the signal frequency of ground wire terminal be lower than 10 MHz when,
Using one point earth, when the signal of ground wire terminal is higher than 10 MHz, using multipoint earthing, inhibition is attached to power supply output, input
The electromagnetic interference at end；
Step 2: to+5V power supply required for core cpu component using multiple-stage filtering handle, and with integrated adjuster into
Row adjustment, power supply line use twisted pair and parallel cabling；
Step 3: the power-supply system of signal terminal is separately designed using analog power and digital power, is inputted in analog power
Series connection isolating transformer before end, and isolating transformer uses 10 μ F inductance, decouples in the vdd terminal of digital power and the parallel connection of the end GND
Capacitor, decoupling capacitor is formed in parallel using ten 80 nF capacitors, and ten 80 nF are polycarbonate capacitor, by mould
It connects before quasi- power input isolating transformer, realizes low-pass filtering, and by parallel in the vdd terminal of digital power and the end GND
Decoupling capacitor, realization filter out high frequency noise；
Step 4: improving useful signal authenticity using software digital filter, for there is the system of significantly random disturbances, adopts
With program margining amplitude technique, continuous sampling 5 times, if the amplitude sampled several times much larger than other is supported in certain primary sampling, then taking with regard to house
It；
Step 5: to signal-transmitting cable output end by semiconductor devices modulating transformation, then by magnetic strength device carry out every
From conversion, finally carries out demodulation and be transformed back to original signal before isolation, while the power supply of signal after isolation is carried out at isolation
Reason, guarantee transformed signal, power supply, between it is absolutely independent；
Step 6: to the shielded layer parallel connection potential balance line of signal-transmitting cable shielding line, and the resistance value of potential balance line is
Shielded layer shields the 1/10 of resistance, solves High-frequency Interference, and shielded layer two-terminal-grounding, reaches inhibition low-frequency disturbance, solves PLC
With the signal interference between intermediate detection device；
Step 7: judging whether signal output terminal is connected to inductive load, if nothing, ends processing, if so, continuing to execute next
Step；
Step 8: judging inductive load property, if inductive load is DC load, in coil both ends parallel connection freewheeling diode, and
Diode uses forward current for the silicon diode of 1 A, if inductive load is AC load, absorbs electricity in coil both ends parallel connection RC
Road, in addition, capacitor takes 0.1 μ F in RC absorbing circuit, and resistance takes 100 Ω if AC load capacity is not higher than 10 VA, if handing over
Current load capacity is higher than 10 VA, and capacitor takes 0.4 μ F in RC absorbing circuit, and resistance takes 40 Ω.
Embodiment two
A kind of anti-interference processing method of signal terminal transmission process, includes the following steps:
Step 1: all ground wire terminals are connected with close grounding point, and the ground connection cross-sectional area that ground wire terminal uses is 3
mm2, ground resistance be 105 Ω when, ground line use dedicated ground wire, and the signal frequency of ground wire terminal be lower than 10 MHz when,
Using one point earth, when the signal of ground wire terminal is higher than 10 MHz, using multipoint earthing, inhibition is attached to power supply output, input
The electromagnetic interference at end；
Step 2: to+5V power supply required for core cpu component using multiple-stage filtering handle, and with integrated adjuster into
Row adjustment, power supply line use twisted pair and parallel cabling；
Step 3: the power-supply system of signal terminal is separately designed using analog power and digital power, is inputted in analog power
Series connection isolating transformer before end, and isolating transformer uses 10 μ F inductance, decouples in the vdd terminal of digital power and the parallel connection of the end GND
Capacitor, decoupling capacitor is formed in parallel using ten 80 nF capacitors, and ten 80 nF are polycarbonate capacitor, by mould
It connects before quasi- power input isolating transformer, realizes low-pass filtering, and by parallel in the vdd terminal of digital power and the end GND
Decoupling capacitor, realization filter out high frequency noise；
Step 4: improving useful signal authenticity using software digital filter, for there is the system of significantly random disturbances, adopts
With program margining amplitude technique, continuous sampling 5 times, if the amplitude sampled several times much larger than other is supported in certain primary sampling, then taking with regard to house
It；
Step 5: to signal-transmitting cable output end by semiconductor devices modulating transformation, then by magnetic strength device carry out every
From conversion, finally carries out demodulation and be transformed back to original signal before isolation, while the power supply of signal after isolation is carried out at isolation
Reason, guarantee transformed signal, power supply, between it is absolutely independent；
Step 6: to the shielded layer parallel connection potential balance line of signal-transmitting cable shielding line, and the resistance value of potential balance line is
Shielded layer shields the 1/10 of resistance, solves High-frequency Interference, and shielded layer two-terminal-grounding, reaches inhibition low-frequency disturbance, solves PLC
With the signal interference between intermediate detection device；
Step 7: judging whether signal output terminal is connected to inductive load, if nothing, ends processing, if so, continuing to execute next
Step；
Step 8: judging inductive load property, if inductive load is DC load, in coil both ends parallel connection freewheeling diode, and
Diode uses forward current for the silicon diode of 1 A, if inductive load is AC load, absorbs electricity in coil both ends parallel connection RC
Road, in addition, capacitor takes 0.1 μ F in RC absorbing circuit, and resistance takes 120 Ω if AC load capacity is not higher than 10 VA, if handing over
Current load capacity is higher than 10 VA, and capacitor takes 0.5 μ F in RC absorbing circuit, and resistance takes 50 Ω.
Embodiment three
A kind of anti-interference processing method of signal terminal transmission process, includes the following steps:
Step 1: all ground wire terminals are connected with close grounding point, and the ground connection cross-sectional area that ground wire terminal uses is 3
mm2, ground resistance be 110 Ω when, ground line use dedicated ground wire, and the signal frequency of ground wire terminal be lower than 10 MHz when,
Using one point earth, when the signal of ground wire terminal is higher than 10 MHz, using multipoint earthing, inhibition is attached to power supply output, input
The electromagnetic interference at end；
Step 2: to+5V power supply required for core cpu component using multiple-stage filtering handle, and with integrated adjuster into
Row adjustment, power supply line use twisted pair and parallel cabling；
Step 3: the power-supply system of signal terminal is separately designed using analog power and digital power, is inputted in analog power
Series connection isolating transformer before end, and isolating transformer uses 10 μ F inductance, decouples in the vdd terminal of digital power and the parallel connection of the end GND
Capacitor, decoupling capacitor is formed in parallel using ten 80 nF capacitors, and ten 80 nF are polycarbonate capacitor, by mould
It connects before quasi- power input isolating transformer, realizes low-pass filtering, and by parallel in the vdd terminal of digital power and the end GND
Decoupling capacitor, realization filter out high frequency noise；
Step 4: improving useful signal authenticity using software digital filter, for there is the system of significantly random disturbances, adopts
With program margining amplitude technique, continuous sampling 5 times, if the amplitude sampled several times much larger than other is supported in certain primary sampling, then taking with regard to house
It；
Step 5: to signal-transmitting cable output end by semiconductor devices modulating transformation, then by magnetic strength device carry out every
From conversion, finally carries out demodulation and be transformed back to original signal before isolation, while the power supply of signal after isolation is carried out at isolation
Reason, guarantee transformed signal, power supply, between it is absolutely independent；
Step 6: to the shielded layer parallel connection potential balance line of signal-transmitting cable shielding line, and the resistance value of potential balance line is
Shielded layer shields the 1/10 of resistance, solves High-frequency Interference, and shielded layer two-terminal-grounding, reaches inhibition low-frequency disturbance, solves PLC
With the signal interference between intermediate detection device；
Step 7: judging whether signal output terminal is connected to inductive load, if nothing, ends processing, if so, continuing to execute next
Step；
Step 8: judging inductive load property, if inductive load is DC load, in coil both ends parallel connection freewheeling diode, and
Diode uses forward current for the silicon diode of 1 A, if inductive load is AC load, absorbs electricity in coil both ends parallel connection RC
Road, in addition, capacitor takes 0.2 μ F in RC absorbing circuit, and resistance takes 100 Ω if AC load capacity is not higher than 10 VA, if handing over
Current load capacity is higher than 10 VA, and capacitor takes 0.4 μ F in RC absorbing circuit, and resistance takes 60 Ω.
Example IV
A kind of anti-interference processing method of signal terminal transmission process, includes the following steps:
Step 1: all ground wire terminals are connected with close grounding point, and the ground connection cross-sectional area that ground wire terminal uses is 4
mm2, ground resistance be 120 Ω when, ground line use dedicated ground wire, and the signal frequency of ground wire terminal be lower than 10 MHz when,
Using one point earth, when the signal of ground wire terminal is higher than 10 MHz, using multipoint earthing, inhibition is attached to power supply output, input
The electromagnetic interference at end；
Step 2: to+5V power supply required for core cpu component using multiple-stage filtering handle, and with integrated adjuster into
Row adjustment, power supply line use twisted pair and parallel cabling；
Step 3: the power-supply system of signal terminal is separately designed using analog power and digital power, is inputted in analog power
Series connection isolating transformer before end, and isolating transformer uses 10 μ F inductance, decouples in the vdd terminal of digital power and the parallel connection of the end GND
Capacitor, decoupling capacitor is formed in parallel using ten 80 nF capacitors, and ten 80 nF are polycarbonate capacitor, by mould
It connects before quasi- power input isolating transformer, realizes low-pass filtering, and by parallel in the vdd terminal of digital power and the end GND
Decoupling capacitor, realization filter out high frequency noise；
Step 4: improving useful signal authenticity using software digital filter, for there is the system of significantly random disturbances, adopts
With program margining amplitude technique, continuous sampling 5 times, if the amplitude sampled several times much larger than other is supported in certain primary sampling, then taking with regard to house
It；
Step 5: to signal-transmitting cable output end by semiconductor devices modulating transformation, then by magnetic strength device carry out every
From conversion, finally carries out demodulation and be transformed back to original signal before isolation, while the power supply of signal after isolation is carried out at isolation
Reason, guarantee transformed signal, power supply, between it is absolutely independent；
Step 6: to the shielded layer parallel connection potential balance line of signal-transmitting cable shielding line, and the resistance value of potential balance line is
Shielded layer shields the 1/10 of resistance, solves High-frequency Interference, and shielded layer two-terminal-grounding；
Step 7: judging whether signal output terminal is connected to inductive load, if nothing, ends processing, if so, continuing to execute next
Step；
Step 8: judging inductive load property, if inductive load is DC load, in coil both ends parallel connection freewheeling diode, and
Diode uses forward current for the silicon diode of 1 A, if inductive load is AC load, absorbs electricity in coil both ends parallel connection RC
Road, in addition, capacitor takes 0.2 μ F in RC absorbing circuit, and resistance takes 140 Ω if AC load capacity is not higher than 10 VA, if handing over
Current load capacity is higher than 10 VA, and capacitor takes 0.5 μ F in RC absorbing circuit, and resistance takes 60 Ω.
In conjunction with the embodiments known to one, embodiment two, embodiment three and example IV:
The anti-interference of signal terminal transmission process can be achieved by four groups of embodiments, wherein two effect of embodiment is best.
Finally, it should be noted that the foregoing is only a preferred embodiment of the present invention, it is not intended to restrict the invention,
Although the present invention is described in detail referring to the foregoing embodiments, for those skilled in the art, still may be used
To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features,
All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in of the invention
Within protection scope.
Claims (8)
1. a kind of anti-interference processing method of signal terminal transmission process, characterized by the following steps:
Step 1: all ground wire terminals are connected with close grounding point；
Step 2: to+5V power supply required for core cpu component using multiple-stage filtering handle, and with integrated adjuster into
Row adjustment, power supply line use twisted pair and parallel cabling；
Step 3: the power-supply system of signal terminal is separately designed using analog power and digital power, is inputted in analog power
Series connection isolating transformer before end, in the vdd terminal and the end GND parallel connection decoupling capacitor of digital power；
Step 4: improving useful signal authenticity using software digital filter, for there is the system of significantly random disturbances, adopts
With program margining amplitude technique, continuous sampling 5 times, if the amplitude sampled several times much larger than other is supported in certain primary sampling, then taking with regard to house
It；
Step 5: to signal-transmitting cable output end by semiconductor devices modulating transformation, then by magnetic strength device carry out every
From conversion, finally carries out demodulation and be transformed back to original signal before isolation, while the power supply of signal after isolation is carried out at isolation
Reason；
Step 6: to the shielded layer parallel connection potential balance line of signal-transmitting cable shielding line, and shielded layer two-terminal-grounding；
Step 7: judging whether signal output terminal is connected to inductive load, if nothing, ends processing, if so, continuing to execute next
Step；
Step 8: judging inductive load property, if inductive load is DC load, in coil both ends parallel connection freewheeling diode, if
Inductive load is AC load, in coil both ends parallel connection RC absorbing circuit.
2. a kind of anti-interference processing method of signal terminal transmission process according to claim 1, it is characterised in that: step
In one: the ground connection cross-sectional area that the ground wire terminal uses is not less than 2 mm2, and using cable tube laying ground line, ground connection electricity
When resistance is no more than 100 Ω, ground line uses dedicated ground wire.
3. a kind of anti-interference processing method of signal terminal transmission process according to claim 1, it is characterised in that: step
In one: when the signal frequency of the ground wire terminal is lower than 10 MHz, using one point earth, the signal of ground wire terminal is higher than 10 MHz
When, using multipoint earthing.
4. a kind of anti-interference processing method of signal terminal transmission process according to claim 1, it is characterised in that: step
In three: the isolating transformer uses 10 μ F inductance.
5. a kind of anti-interference processing method of signal terminal transmission process according to claim 1, it is characterised in that: step
In three: the decoupling capacitor is formed in parallel using ten 80 nF capacitors, and ten 80 nF are polycarbonate capacitor.
6. a kind of anti-interference processing method of signal terminal transmission process according to claim 1, it is characterised in that: step
In six: the resistance value of the potential balance line is less than the 1/10 of shielded layer shielding resistance.
7. a kind of anti-interference processing method of signal terminal transmission process according to claim 1, it is characterised in that: step
In eight: the diode uses silicon diode, and its forward current is 1 A.
8. a kind of anti-interference processing method of signal terminal transmission process according to claim 1, it is characterised in that: step
In eight: if AC load capacity is not higher than 10 VA, capacitor takes 0.1-0.2 μ F in the RC absorbing circuit, and resistance takes 100-140
Ω, if AC load capacity is higher than 10 VA, capacitor takes 0.4-0.5 μ F in the RC absorbing circuit, and resistance takes 40-60 Ω.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111624384A (en) * | 2020-06-05 | 2020-09-04 | 深圳供电局有限公司 | Partial pressure monitoring anti-interference device |
| CN113007883A (en) * | 2021-03-02 | 2021-06-22 | 珠海拓芯科技有限公司 | Anti-interference device, electronic equipment and air conditioner |
| CN114968887A (en) * | 2022-08-01 | 2022-08-30 | 泉州艾奇科技有限公司 | Low-interference long-line driving unit, daisy chain and transmission network |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111624384A (en) * | 2020-06-05 | 2020-09-04 | 深圳供电局有限公司 | Partial pressure monitoring anti-interference device |
| CN113007883A (en) * | 2021-03-02 | 2021-06-22 | 珠海拓芯科技有限公司 | Anti-interference device, electronic equipment and air conditioner |
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| CN114968887A (en) * | 2022-08-01 | 2022-08-30 | 泉州艾奇科技有限公司 | Low-interference long-line driving unit, daisy chain and transmission network |
| CN114968887B (en) * | 2022-08-01 | 2022-10-04 | 泉州艾奇科技有限公司 | Low-interference long-line driving unit, daisy chain and transmission network |
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Application publication date: 20190412 |