CN110907863A - Analog input channel wiring state detection method and system - Google Patents
Analog input channel wiring state detection method and system Download PDFInfo
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- CN110907863A CN110907863A CN201911262500.1A CN201911262500A CN110907863A CN 110907863 A CN110907863 A CN 110907863A CN 201911262500 A CN201911262500 A CN 201911262500A CN 110907863 A CN110907863 A CN 110907863A
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Abstract
Compared with the existing analog quantity channel state detection technology, the method and the system do not need a specially-assigned person to carry out field inspection on the wiring condition of the input channel by using measuring equipment, and do not simply judge the state of the input channel according to data software after analog-to-digital conversion. The original signal is utilized to carry out the hardware detection of the channel state with the input range fully covered, a logic judgment signal is generated, the channel state can be rapidly and accurately known to be a normal state, an open circuit state or a short circuit state and the like through the level of the logic signal, and the accuracy of the detection of the channel wiring state is improved.
Description
Technical Field
The invention relates to the field of signal acquisition, in particular to a method and a system for detecting the wiring state of an analog input channel.
Background
At present, analog quantity signals are widely applied to the fields of intelligent detection and automatic control, physical quantities such as sound, light, force, temperature and the like in nature and other derived related quantities are converted into electric signals capable of being measured by using a special sensor, such as voltage, current and resistance, so that the purposes of quantifying sound, pressure, temperature, speed, vibration, distance and the like are achieved, and a basis is provided for intelligent detection and automatic control. When the system application occasion is important or the application environment is severe, the data accuracy of the analog quantity signal output to the detection device of the sensor influences the stability of the system.
The output of the sensor is connected to a dedicated analog input channel through a cable, and in order to ensure the accuracy of the access signal, the validity of the wiring state of the input channel must be judged.
The existing analog input channel wiring state detection can be used for carrying out field inspection by using detection equipment such as a universal meter and the like during equipment installation, or specially sending people to the field for inspecting the wiring condition when a fault occurs. In addition, the wiring state of the analog input channel can be detected through the acquired data and a software algorithm.
However, the collected data is judged according to a software algorithm, and although the field detection by a special person is not needed, the method has the defect that whether the signal is 0 or the wiring is opened or short-circuited cannot be judged when the collected data is 0, so that the wiring state of the channel cannot be accurately detected.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: provided are a method and a system for detecting the wiring state of an analog input channel, which can accurately detect the wiring state of the channel.
A method for detecting the wiring state of an analog input channel comprises the following steps:
step 1: setting circuit parameters of a signal acquisition module according to the electrical characteristics of the analog quantity input signal;
step 2: inputting the output signal of the acquisition module into an amplitude comparison module;
and step 3: the amplitude comparison module outputs the comparison result to the processor in a digital quantity form;
and 4, step 4: the processor determines the validity of the input channel based on the 0 or 1 level.
Another technical solution of the present invention is to provide that, based on the above, the electrical characteristics of the analog input signal include a voltage amount, a current amount, a resistance amount, a signal amplitude and/or a frequency.
Another technical solution of the present invention is that, on the basis of the above, the step 4 specifically includes: when the processor detects a logic high level, judging that the wiring state of the surface port is normal; when the processor detects a logic low level, the judgment indicates that the port wiring state is abnormal.
Another technical solution of the present invention is to provide a system for detecting a wiring state of an analog input channel based on the above, including a channel signal acquisition module, an amplitude comparison module, and a channel state output module,
the channel signal acquisition module is used for acquiring an input original signal of a channel and carrying out static bias on the original signal at an input end;
the amplitude comparison module compares the amplitude of the original signal acquired by the channel signal acquisition module with the amplitude of the reference signal, and sends the logic level of the comparison result to the processor for identification to form a high level or a low level;
and the channel state output module outputs a result for judging whether the port wiring state is normal or abnormal according to the high level or the low level output by the amplitude comparison module.
On the basis, the other technical scheme of the invention is that the channel signal acquisition module comprises an analog voltage input channel positive electrode acquisition module and an analog voltage input channel negative electrode acquisition module.
On the basis, the analog voltage input channel positive electrode acquisition module comprises an integrated operational amplifier U1A, wherein the positive input end of the integrated operational amplifier U1A is connected with a resistor R2 and a capacitor C1, the other end of the capacitor C1 is grounded, and the other end of a resistor R2 is connected with the analog voltage input channel positive electrode acquisition end and is connected with a power supply + V1 through a resistor R1; the inverting input end of the integrated operational amplifier U1A is connected with the output end; the output end of the integrated operational amplifier U1A is connected with an amplitude comparison module.
On the basis, the analog voltage input channel negative electrode acquisition module comprises an integrated operational amplifier U1B, wherein the positive input end of the integrated operational amplifier U1B is connected with a resistor R4 and a capacitor C4, the other end of the capacitor C4 is grounded, and the other end of the resistor R4 is connected with the analog voltage input channel negative electrode acquisition end and is connected with a power supply + V1 through a resistor R3; the inverting input end of the integrated operational amplifier U1A is connected with the output end; the output end of the integrated operational amplifier U1B is connected with an amplitude comparison module.
On the basis, the amplitude comparison module comprises voltage comparators U2A and U2B, wherein a positive input end of the voltage comparator U2A is connected with a positive input end of the voltage comparator U2B and is connected with a reference voltage; the negative input end of the voltage comparator U2A is connected with the output end of the integrated operational amplifier U1A, and the negative input end of the voltage comparator U2B is connected with the output end of the integrated operational amplifier U1B; the output end of the voltage comparator U2A is connected with the output end of the voltage comparator U2B and is connected with a power supply + V2 through a resistor R5, the output end of the voltage comparator U2A is grounded through a diode D1 and a resistor R6 which are arranged in the forward direction, and the cathode of the diode D1 is connected with the channel state output module.
Compared with the existing analog quantity channel state detection technology, the analog quantity input channel wiring state detection method and the analog quantity input channel wiring state detection system do not need a specially-assigned person to use measuring equipment to carry out field inspection on the wiring condition of the input channel, and do not simply judge the state of the input channel according to data software after analog-to-digital conversion. The original signal is utilized to carry out the hardware detection of the channel state with the input range fully covered, a logic judgment signal is generated, the channel state can be rapidly and accurately known to be a normal state, an open circuit state or a short circuit state and the like through the level of the logic signal, and the accuracy of the detection of the channel wiring state is improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention.
Fig. 1 is a flowchart of a method for detecting a wiring state of an analog input channel according to an embodiment of the present disclosure;
fig. 2 is a circuit diagram of an analog input channel connection state detection system according to an embodiment of the present invention.
Detailed Description
The present invention will now be described in detail with reference to the drawings, which are given by way of illustration and explanation only and should not be construed to limit the scope of the present invention in any way. Furthermore, features from embodiments in this document and from different embodiments may be combined accordingly by a person skilled in the art from the description in this document.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The embodiment of the invention is as follows, please refer to fig. 1, and a method for detecting the wiring state of an analog input channel comprises the following steps:
step 1: setting circuit parameters of the signal acquisition module according to the electrical characteristics (voltage quantity, current quantity and resistance quantity) of the input signal, the signal amplitude and the frequency range;
step 2: sending the output signal of the acquisition module to an amplitude comparison module;
and step 3: the amplitude comparison module outputs the comparison result to the processor in a digital quantity form;
and 4, step 4: the processor judges the validity of the input channel according to the 0 or 1 level, such as open circuit or short circuit of the channel.
Fig. 2 is a circuit diagram of the analog input channel connection state detection system according to the present invention. The analog input channel wiring state detection system comprises a channel signal acquisition module, an amplitude comparison module and a channel state output module. The channel signal acquisition module comprises an integrated operational amplifier U1A and U1B, and a 2-path low-pass high-impedance state voltage acquisition circuit consisting of R2, C1, R4 and C4, wherein the selection values of R2, C1, R4 and C4 depend on the requirements of the circuit on input impedance and the frequency of an input signal. R1 and R3 are megaohm pull-up resistors. C2 and C3 are power supply decoupling capacitors;
the amplitude comparison module comprises a voltage comparator (which can also be an integrated operational amplifier working in a nonlinear region) U2A and U2B. R7 and R8 are voltage dividing resistors for generating comparator reference voltage. R5, R6, D1 (diodes) are used to match the output logic level. C5 and C6 are power supply decoupling capacitors;
in addition, the power source description and relationships in fig. 2: v1 and V1 are power supplies of the operational amplifier and the comparator, the power supplies are equal in amplitude and opposite in direction, the value is related to the input range (K), and if the input signal has no negative voltage-V1, the power supply can be changed to GND. Vref is the value of the comparator equidirectional input reference voltage and is related to the input range. + V2 is the maximum amplitude of the output logic level, the value of which depends on the voltage recognizable by the processing IO. The magnitude relationship of the voltages, K < Vref < V1.
The invention relates to a wiring state detection device of an analog input channel, which firstly collects an input original signal of the channel; the method fully utilizes the characteristic that the input impedance of the input end of an integrated operational amplifier (hereinafter referred to as operational amplifier) is infinite to realize the acquisition of the channel input original signal, and simultaneously does not influence the electrical characteristics of the normal signal, such as signal amplitude, phase and the like. In order to distinguish an input signal in the normal range from a fault signal, the original signal is statically biased at the input. As shown in fig. 2, when an analog voltage signal in a range (assumed to be ± K) is input at an input end of a channel signal acquisition module in an analog input channel state detection schematic diagram, an output amplitude of an output end (U +, U-) of the module is equal to an amplitude of a signal accessed on a channel; when the cable of the input channel is in an open circuit or short circuit state, the output amplitude of the output end (U +, U-) of the module is equal to + V1 due to the pull-up of the bias voltage + V1. Wherein, + V1> + -K.
Then comparing the amplitude of the original signal with the reference signal; specifically, as shown in fig. 2, the amplitude comparison module is designed to be composed of 1 voltage comparator (hereinafter referred to as "comparator") unit and 1 reference voltage unit, and the inverting input terminals of the comparator unit are provided by U + and U2 in step 1 above. The reference voltage unit is provided by adopting a resistance voltage division form or a voltage reference chip (remark: + V1> Vref > positive voltage value in range), and the reference voltage is connected to the same-direction input end of the comparator. In combination with the input-output characteristics of the comparator, namely: when the voltage of the equidirectional input end (pin 3 of U2A and pin 5 of U2B) is greater than the voltage of the reverse input end (pin 2 of U2A and pin 6 of U2B), a high impedance state is output, and a logic high level is output due to the pull-up action of R5, wherein R5 is less than R6/3; when the voltage of the same-direction input end (pin 3 of U2A and pin 5 of U2B) is less than the voltage of the reverse-direction input end (pin 2 of U2A and pin 6 of U2B), the negative supply voltage of the comparator is output, and because the diode is in a reverse cut-off state, a logic low level is output under the pull-down action of R6. The comparator unit is formed by connecting 2 paths of voltage comparator outputs in parallel, and the output characteristics of the comparators can be known as follows: the module will output a high + V2 only if U + and U-simultaneously satisfy the conditions U + < Vref, U- < Vref. Where + V2 is a logic high level that the processor can recognize, otherwise a low level is output.
Finally, the logic level of the comparison result is sent to a processor for identification; specifically, the processor discriminates the wiring condition of the input port of the analog channel according to the output logic level, and the specific process is as follows: when the processor detects a logic high level, the positive pole and the negative pole of the port channel at the moment receive voltage signals in an identifiable range at the same time, and the surface port is in a normal wiring state; when the processor detects a logic low level, it indicates that the anode and the cathode of the port channel are suspended or suspended at the same time, and the anode and the cathode of the channel are short-circuited at the moment, indicating that the port connection state is abnormal and giving an alarm.
Compared with the existing analog quantity channel state detection technology, the analog quantity input channel wiring state detection method and the analog quantity input channel wiring state detection system do not need a specially-assigned person to use measuring equipment to carry out field inspection on the wiring condition of the input channel, and do not simply judge the state of the input channel according to data software after analog-to-digital conversion. The original signal is utilized to carry out the hardware detection of the channel state with the input range fully covered, a logic judgment signal is generated, the channel state can be rapidly and accurately known to be a normal state, an open circuit state or a short circuit state and the like through the level of the logic signal, and the accuracy of the detection of the channel wiring state is improved.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (8)
1. A method for detecting the wiring state of an analog input channel is characterized by comprising the following steps: the method comprises the following steps:
step 1: setting circuit parameters of a signal acquisition module according to the electrical characteristics of the analog quantity input signal;
step 2: inputting the output signal of the acquisition module into an amplitude comparison module;
and step 3: the amplitude comparison module outputs the comparison result to the processor in a digital quantity form;
and 4, step 4: the processor determines the validity of the input channel based on the 0 or 1 level.
2. The analog input channel wiring state detecting method according to claim 1, wherein the electrical characteristics of the analog input signal include a voltage amount, a current amount, a resistance amount, a signal amplitude and/or a frequency.
3. The method for detecting the wiring state of the analog input channel according to claim 1, wherein the step 4 specifically comprises: when the processor detects a logic high level, judging that the wiring state of the surface port is normal; when the processor detects a logic low level, the judgment indicates that the port wiring state is abnormal.
4. A wiring state detection system of an analog input channel is characterized by comprising a channel signal acquisition module, an amplitude comparison module and a channel state output module, wherein,
the channel signal acquisition module is used for acquiring an input original signal of a channel and carrying out static bias on the original signal at an input end;
the amplitude comparison module compares the amplitude of the original signal acquired by the channel signal acquisition module with the amplitude of the reference signal, and sends the logic level of the comparison result to the processor for identification to form a high level or a low level;
and the channel state output module outputs a result for judging whether the port wiring state is normal or abnormal according to the high level or the low level output by the amplitude comparison module.
5. The analog input channel wiring state detection system of claim 4, wherein the channel signal acquisition module comprises an analog voltage input channel positive acquisition module and an analog voltage input channel negative acquisition module.
6. The analog input channel wiring state detection system of claim 5, wherein the analog voltage input channel positive acquisition module comprises an integrated operational amplifier U1A, a positive input end of the integrated operational amplifier U1A is connected with a resistor R2 and a capacitor C1, the other end of the capacitor C1 is grounded, and the other end of the resistor R2 is connected with the analog input channel positive acquisition end and is connected with a power supply + V1 through a resistor R1; the inverting input end of the integrated operational amplifier U1A is connected with the output end; the output end of the integrated operational amplifier U1A is connected with an amplitude comparison module.
7. The analog input channel wiring state detection system of claim 5, wherein the analog voltage input channel negative acquisition module comprises an integrated operational amplifier U1B, a positive input end of the integrated operational amplifier U1B is connected with a resistor R4 and a capacitor C4, the other end of the capacitor C4 is grounded, and the other end of the resistor R4 is connected with the analog input channel negative acquisition end and is connected with a power supply + V1 through a resistor R3; the inverting input end of the integrated operational amplifier U1A is connected with the output end; the output end of the integrated operational amplifier U1B is connected with an amplitude comparison module.
8. The analog input channel wiring state detecting system according to any one of claims 4 to 7, wherein the amplitude comparison module comprises voltage comparators U2A and U2B, a positive input terminal of the voltage comparator U2A is connected with a positive input terminal of the voltage comparator U2B, and a reference voltage is accessed; the negative input end of the voltage comparator U2A is connected with the output end of the integrated operational amplifier U1A, and the negative input end of the voltage comparator U2B is connected with the output end of the integrated operational amplifier U1B; the output end of the voltage comparator U2A is connected with the output end of the voltage comparator U2B and is connected with a power supply + V2 through a resistor R5, the output end of the voltage comparator U2A is grounded through a diode D1 and a resistor R6 which are arranged in the forward direction, and the cathode of the diode D1 is connected with the channel state output module.
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| CN112600549A (en) * | 2020-12-11 | 2021-04-02 | 北京空间机电研究所 | Universal interface circuit suitable for testing various types of transmission signals of recovery and landing system |
| CN113640710A (en) * | 2021-08-13 | 2021-11-12 | 深圳市新威尔电子有限公司 | Channel crossing automatic detection method |
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