A method for secure dual-channel signal transmission using a single-channel encoder instead of a dual-channel encoder.

Abstract

This invention relates to encoder application technology, and more particularly to a method for secure dual-channel signal transmission that replaces dual-channel encoders with a single-channel encoder. Through an integrated design of "signal preprocessing – isolation and allocation – enhanced drive transmission – real-time transmission status monitoring," the A / B / Z signals output from a single-channel incremental encoder are precisely split and securely transmitted to the PLC control system and drive system, replacing the function of traditional dual-channel encoders. This solves the problems of high cost, complex wiring, and difficult maintenance associated with dual-channel encoders. Furthermore, through signal isolation, enhanced drive transmission, and real-time monitoring mechanisms, signal transmission failures caused by electromagnetic interference and other factors are effectively avoided, ensuring the safe operation of the industrial control system. Additionally, through enhanced drive transmission analysis, the drive circuit is rationally enhanced to ensure the effectiveness and stability of signal transmission, while reducing the cost of enhanced drive and the risk of signal failure.

Description

Technical Field

[0001] This invention relates to the field of encoder technology, and more particularly to a method for secure transmission of dual signals using a single-channel encoder instead of a dual-channel encoder. Background Technology

[0002] In industrial automation control systems, encoders are important devices used to measure physical quantities such as displacement, speed, and angle. Incremental encoders are widely used because of their simple structure, low cost, and ability to meet the position and speed measurement needs of most industrial scenarios. Traditional incremental encoders usually adopt a dual-output design. One signal is connected to the control system such as PLC to provide it with key data such as the position and speed of the equipment for precise process control and monitoring. The other signal is connected to the transmission system to ensure that the transmission system performs precise transmission based on the encoder's measurement results to achieve coordinated operation of the equipment.

[0003] However, traditional dual-channel encoders have obvious technical defects: on the one hand, the hardware manufacturing cost of dual-channel encoders is higher than that of single-channel encoders, and in large-scale industrial equipment deployments, more encoders and related components are required, which leads to a significant increase in equipment procurement costs. At the same time, dual-channel signal transmission requires the laying of more cables, cable trays and other auxiliary materials, which further increases the overall construction cost of the system. On the other hand, complex wiring increases the number of fault points, which leads to increased maintenance difficulty and cost in the later stage, and the lack of real-time transmission stability and security monitoring and feedback mechanisms increases the risk of secure dual-channel signal transmission. Summary of the Invention

[0004] The purpose of this invention is to provide a method for safe transmission of dual signals using a single-channel encoder instead of a dual-channel encoder. This method employs an integrated design of "signal preprocessing - isolation and distribution - enhanced drive transmission - real-time transmission status monitoring" to accurately separate and safely transmit the A / B / Z signals output from a single-channel incremental encoder to the PLC control system and drive system. This replaces the function of a traditional dual-channel encoder, solving the problems of high cost, complex wiring, and difficult maintenance associated with dual-channel encoders. Furthermore, real-time transmission status monitoring ensures the accuracy and reliability of signal transmission. Through signal isolation, enhanced drive transmission, and real-time monitoring mechanisms, signal transmission failures caused by electromagnetic interference and other factors are effectively avoided, ensuring the safe operation of the industrial control system.

[0005] The objective of this invention can be achieved through the following technical solution: a method for secure transmission of dual-channel signals using a single-channel encoder instead of a dual-channel encoder, comprising the following steps: Step 1: Signal Acquisition and Preprocessing: Acquire the raw A / B / Z three-phase signals output by a single-channel incremental encoder, obtain standardized differential signals through preprocessing of the raw signals, and perform constraint matching analysis until qualified signals are obtained. Step 2: Isolated signal distribution: The pre-processed standardized differential signal is electrically isolated using a pre-set opto-isolation module, splitting it into two independent signal channels, corresponding to the signal requirements of the PLC control system and the drive system, respectively. Step 3: Enhance drive transmission: Analyze the drive enhancement requirements of the drive circuit, and conduct a drive enhancement requirement evaluation analysis. Based on the evaluation output results, adjust the drive circuit to enhance the drive. Step 4: Real-time monitoring of transmission status: Set up an information acquisition device at the output of the signal distribution circuit to monitor the amplitude data, frequency data, and waveform data transmitted to the PLC control system and transmission system in real time. When the signal parameters exceed the preset threshold, an alarm will be triggered.

[0006] Preferably, the specific process of signal acquisition and preprocessing is as follows: The raw A / B / Z three-phase signals output by the single-channel incremental encoder are collected during operation. The collected raw A / B / Z three-phase signals are preprocessed to obtain standardized differential signals. The constraints of the standardized differential signal are obtained. These constraints include the pulse duty cycle being within a preset pulse duty cycle range and the time interval error between adjacent pulses being less than or equal to a preset threshold. The standardized differential signal is then subjected to constraint verification to determine whether it simultaneously meets the constraints. If both constraints are met, a qualified signal is generated. If not, an unqualified signal is generated. When an unqualified signal is generated, the acquired A / B / Z three-phase raw signals are reprocessed until a qualified signal is generated.

[0007] Preferably, the analysis process for the isolated signal allocation is as follows: S1: Connect the pre-processed standardized differential signals (A+, A-, B+, B-, Z+, Z-) to the input terminal of the pre-set opto-isolation module, and control the input current through the pre-set current limiting resistor to drive the light-emitting diode inside the opto-isolation module to emit light; S2: The output of each opto-isolation module is pre-designed with two independent signal amplification circuits to convert the light signal sensed by the photosensitive element into an electrical signal and replicate it into two level signals that are completely consistent with the waveform and phase of the input signal at the input end; Simultaneously, a continuous evaluation and analysis process is conducted on the synchronization control and waveform consistency of the input signal during the replication period.

[0008] Preferably, the continuous evaluation and analysis process is as follows: The rising / falling edge timing deviation, voltage amplitude, and pulse duty cycle (the ratio of the time the signal is at a high level to the total time of the entire cycle) of two replicated signals that have the same original signal are obtained. The timing deviation of the rising / falling edge, voltage amplitude, and pulse duty cycle are processed to obtain the results of the replication validity (valid signal) and replication invalidity (invalid signal). When a valid signal is generated, the two sets of output circuits are powered by independent isolated power supplies.

[0009] Preferably, the process of driving enhanced demand evaluation and analysis is as follows: T1: Let the output current of the drive circuit be L0, the cable resistance be R, and the minimum current required by the receiving end be Lmin. Then: the current reaching the receiving end after transmission is L1, L1 = L0 - (the loss current caused by the cable voltage drop). Attenuation enhancement determination analysis was performed on L1 to obtain the discrimination results of whether enhancement driving is required or not; T2: Obtain the transmission distance of the original signal (or the isolated signal), and perform enhancement judgment analysis on the transmission distance to obtain the discrimination result of whether enhancement driving is required or not; T3: Obtain the input current and output current of the input signal of the single-channel incremental encoder, and perform enhanced judgment analysis on the input current and output current to obtain the judgment result of whether enhanced driving is required or not. T4: Based on the enhancement judgment analysis of T1-T3, the number of drivers that need enhancement is obtained, and the number of drivers that need enhancement is set as the driver enhancement demand degree. At the same time, the driver enhancement demand degree is processed to obtain the signal that is not needed or the signal that is needed.

[0010] Preferably, the analysis process for real-time monitoring of the transmission status is as follows: The system acquires the amplitude, frequency, and waveform data of the output signal of the single-channel incremental encoder during operation. It also acquires the amplitude data of the five most recent historical data sets and calculates the average amplitude based on these five sets. The current amplitude index is calculated based on |amplitude data - average amplitude| / average amplitude. The system also acquires the rated frequency of the single-channel incremental encoder and calculates the current frequency index based on |frequency data - rated frequency| / rated frequency. Finally, the system acquires the total harmonic distortion rate of the waveform based on the waveform data.

[0011] Preferably, the current amplitude index, current frequency index, and total harmonic distortion rate are processed to obtain the judgment results of real-time normal and real-time abnormal. If the judgment result of real-time abnormal is obtained, the real-time abnormality is analyzed. If more than two real-time abnormal results occur consecutively, an alarm signal is generated.

[0012] The beneficial effects of this invention are as follows: This invention uses an integrated design of "signal preprocessing - isolation distribution - enhanced drive transmission - real-time monitoring of transmission status" to accurately split and safely transmit the A / B / Z signals output by a single incremental encoder to the PLC control system and drive system, replacing the function of the traditional dual encoder and solving the problems of high cost, complex wiring and difficult maintenance of dual encoders.

[0013] This invention also effectively avoids signal transmission failures caused by factors such as electromagnetic interference through signal isolation, enhanced drive transmission, and real-time monitoring mechanisms, ensuring the safe operation of industrial control systems. At the same time, through enhanced drive transmission analysis, the drive circuit is reasonably enhanced to ensure the effectiveness and stability of signal transmission, while reducing the cost of enhanced drive and the risk of signal failure. Attached Figure Description

[0014] The invention will now be further described with reference to the accompanying drawings; Figure 1 This is a reference diagram of the method of the present invention; Figure 2 This is a partial reference diagram of Embodiment 2 of the present invention. Detailed Implementation

[0015] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0016] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments; Example 1: Please refer to Figures 1 to 2 As shown, this invention is a method for secure transmission of dual signals using a single-channel encoder instead of a dual-channel encoder, comprising the following steps: Step 1: Signal Acquisition and Preprocessing: Acquire the raw A / B / Z three-phase signals output by a single-channel incremental encoder, obtain standardized differential signals through preprocessing of the raw signals, and perform constraint matching analysis until qualified signals are obtained. Step 2: Isolated signal distribution: The pre-processed standardized differential signal is electrically isolated using a pre-set opto-isolation module, splitting it into two independent signal channels, corresponding to the signal requirements of the PLC control system and the drive system, respectively. Step 3: Enhance drive transmission: Analyze the drive enhancement requirements of the drive circuit, and conduct a drive enhancement requirement evaluation analysis. Based on the evaluation output results, adjust the drive circuit to enhance the drive. Step 4: Real-time monitoring of transmission status: Set up information acquisition devices (such as voltage sensors and frequency counters) at the output of the signal distribution circuit to monitor the amplitude data, frequency data, and waveform data transmitted to the PLC control system and transmission system in real time. When the signal parameters (including the current amplitude index, the current frequency index, and the total harmonic distortion rate) exceed the preset threshold, an alarm prompt will be triggered. Among them, signal acquisition and preprocessing: acquire the raw A / B / Z three-phase signals output by a single-channel incremental encoder, obtain standardized differential signals by preprocessing the raw signals, and perform constraint matching analysis until qualified signals are obtained. The specific process is as follows: Acquire the A / B / Z three-phase raw signals output by the single-channel incremental encoder during operation, and preprocess the acquired A / B / Z three-phase raw signals to obtain standardized differential signals. The preprocessing includes noise filtering, edge correction, etc. The constraints of the standardized differential signal are obtained. These constraints include the pulse duty cycle being within a preset pulse duty cycle range and the time interval error between adjacent pulses being less than or equal to a preset threshold. The standardized differential signal is then subjected to constraint verification to determine whether it simultaneously meets the constraints. If the constraints are simultaneously met, a qualified signal is generated. If the constraints are not simultaneously met, an unqualified signal is generated. When an unqualified signal is generated, the acquired A / B / Z three-phase raw signals are reprocessed until a qualified signal is generated. When a qualified signal is generated, isolated signal distribution is then performed: a pre-set opto-isolation module is used to electrically isolate the pre-processed standardized differential signal, splitting it into two independent signal channels, corresponding to the signal requirements of the PLC control system and the drive system, respectively. The specific process is as follows: S1: Connect the pre-processed standardized differential signals (A+, A-, B+, B-, Z+, Z-) to the input terminal of a pre-set opto-isolation module (such as a dual-channel high-speed optocoupler or a single-channel optocoupler combination design), and control the input current through a pre-set current-limiting resistor to drive the light-emitting diode inside the opto-isolation module to emit light. S2: The output of each opto-isolation module is pre-designed with two independent signal amplification circuits (such as transistor push-pull output or Schmitt trigger shaping) to convert the light signal sensed by the photosensitive element into an electrical signal and replicate it into two level signals (such as TTL / RS422 level) that are completely consistent with the waveform and phase of the input signal at the input end. Simultaneously, a continuous evaluation and analysis process is conducted on the synchronization control and waveform consistency of the input signal (input current signal) during the replication period. This includes: acquiring the rising / falling edge timing deviation, voltage amplitude, and pulse duty cycle (the ratio of the time the signal is at a high level to the total cycle time) of two replicated signals from the same original signal (such as phase A). The system performs discrimination processing on rising / falling edge timing deviation, voltage amplitude, and pulse duty cycle. If the rising / falling edge timing deviation, voltage amplitude, and pulse duty cycle are all simultaneously less than a preset deviation threshold, the system is deemed to have valid replication and generates a valid signal. If the rising / falling edge timing deviation, voltage amplitude, and pulse duty cycle are not simultaneously less than a preset deviation threshold, the system is deemed to have invalid replication and generates an invalid signal. The system immediately responds to the invalid signal and displays the preset warning text corresponding to the invalid signal. This allows for a clear understanding of whether the synchronization control and waveform consistency of the input signal are valid during the replication period, enabling timely and rational management. This helps avoid inconsistencies in pulse counting between the PLC and the drive system due to delay differences, and also avoids misjudgments at the receiving end due to waveform distortion. S3: When a valid signal is generated, the two sets of output circuits are powered by independent isolated power supplies (such as 5V or 12V power supplies provided by DC-DC isolation modules) to ensure that the power ground of the PLC side and the drive system side are completely isolated, and to avoid interference caused by ground potential difference through the power supply loop. Through the above design, the A / B / Z signals of a single-channel incremental encoder can be accurately split into two completely independent, synchronous, and interference-free signals, which are transmitted to the PLC control system and the drive system respectively. Functionally, this is equivalent to the output of a traditional dual-channel encoder, while avoiding mutual interference between the two signals.

[0017] Example 2: The drive circuit undergoes a drive enhancement requirement acquisition and analysis, accompanied by a drive enhancement requirement evaluation and analysis. Based on the evaluation output results, the drive circuit is adjusted for drive enhancement. The specific drive enhancement requirement acquisition and analysis process is as follows: T1: Let the output current of the drive circuit be L0, the cable resistance be R (unit: Ω, determined by the cable length L and wire diameter, which can be found in the cable parameter table), and the minimum current required by the receiving end be Lmin. Then: the current reaching the receiving end after transmission is L1, L1 = L0 - (loss current caused by cable voltage drop). Example: 30 meters 0.5mm 2 The cable resistance R≈30×0.03=0.9Ω, and the receiving end Lmin=3mA. If the original signal L0=5mA, after transmission L1≈5-(5×0.9 / 5)=4.1mA (simplified calculation), which meets the requirements but has insufficient margin; if after driving L0=10mA, L1≈10-(10×0.9 / 5)=8.2mA, with sufficient margin and stronger anti-attenuation capability; An attenuation enhancement determination analysis is performed on L1. If L1≥Lmin, it is determined that no enhancement drive is needed; if L1<Lmin, it is determined that enhancement drive is needed. T2: Obtain the transmission distance of the original signal (or the isolated signal) and perform enhancement judgment analysis on the transmission distance. If the transmission distance is less than the preset transmission distance threshold, it is determined that no enhancement drive is needed. If the transmission distance is greater than or equal to the preset transmission distance threshold, it is determined that enhancement drive is needed. T3: Obtain the input current and output current of the input signal of the single-channel incremental encoder, and perform enhanced judgment analysis on the input current and output current. If the input current is greater than the preset input current threshold and the output current is less than or equal to the threshold output current threshold, it is determined that no enhanced drive is needed. If the input current is not greater than the preset input current threshold and the output current is less than or equal to the threshold output current threshold, it is determined that enhanced drive is needed. T4: Based on the enhancement judgment analysis of T1-T3, the number of drives that need enhancement is determined, and the number of drives that need enhancement is set as the drive enhancement demand degree. At the same time, the drive enhancement demand degree is processed. If the drive enhancement demand degree = 3, an unnecessary signal is generated. If the drive enhancement demand degree ≠ 3, a demand signal is generated. Based on the unnecessary signal or the demand signal, the preset warning operation corresponding to the unnecessary signal or the demand signal is performed. That is, the preset warning text corresponding to the unnecessary signal is displayed, and the preset warning text corresponding to the demand signal is displayed, so as to reasonably enhance the drive circuit and ensure the effectiveness and stability of signal transmission.

[0018] Example 3: Real-time transmission status monitoring: An information acquisition device (such as a voltage sensor or frequency counter) is set at the output of the signal distribution circuit to monitor the amplitude, frequency, and waveform data transmitted to the PLC control system and the transmission system in real time. When the signal parameters (including the current amplitude index, the current frequency index, and the total harmonic distortion rate) exceed the preset threshold, an alarm is triggered. The specific analysis process is as follows: The amplitude, frequency, and waveform data of the output signal of a single-channel incremental encoder are obtained during operation. Simultaneously, the amplitude data of the 5 most recent historical data sets is obtained, and the average amplitude is calculated based on the amplitude data of the 5 historical data sets; The current amplitude index is calculated based on |amplitude data - mean amplitude| / mean amplitude; Simultaneously, the rated frequency of the single-channel incremental encoder is obtained, and the current frequency index is calculated based on |frequency data - rated frequency| / rated frequency; The total harmonic distortion (THD) of the waveform is obtained from the waveform data. THD = (f2) 2 +f3 2 +…fn 2 (√(f1 / f2)) where f1 is the fundamental amplitude, f2-fn is the harmonic amplitude, and n is greater than 3. The current amplitude index, current frequency index, and total harmonic distortion rate are judged and processed. If there is no current amplitude index greater than or equal to the preset current amplitude index threshold, current frequency index greater than or equal to the preset current frequency index threshold, and total harmonic distortion rate greater than the preset total harmonic distortion rate threshold, then it is judged to be normal in real time. If at least one of the following exists: current amplitude index is greater than or equal to the preset current amplitude index threshold, current frequency index is greater than or equal to the preset current frequency index threshold, and total harmonic distortion rate is greater than the preset total harmonic distortion rate threshold, then it is determined to be a real-time anomaly. The real-time anomaly is analyzed, and if more than two real-time anomaly results occur consecutively, an alarm signal is generated, and the preset audible and visual alarm operation corresponding to the alarm signal is immediately performed to remind the operation and management personnel to manage the existing abnormal faults in a timely manner, so as to improve the efficiency of real-time transmission status monitoring of dual signals. In summary, through an integrated design of "signal preprocessing - isolation and distribution - enhanced drive transmission - real-time transmission status monitoring," the A / B / Z signals output by a single incremental encoder are accurately split and safely transmitted to the PLC control system and drive system, replacing the function of the traditional dual-channel encoder. This solves the problems of high cost, complex wiring, and difficult maintenance associated with dual-channel encoders. At the same time, real-time transmission status monitoring ensures the accuracy and reliability of signal transmission. Furthermore, the signal isolation, enhanced drive transmission, and real-time monitoring mechanisms effectively avoid signal transmission failures caused by electromagnetic interference and other factors, ensuring the safe operation of the industrial control system.

[0019] The threshold is set for comparative analysis of results to determine whether they are good or bad. The value of the threshold is determined by a combination of large-scale model analysis of sample data and human experience. It can also be adjusted appropriately based on seasonal or common-sense influencing factors.

[0020] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A method for secure transmission of a two-channel signal by replacing a two-channel encoder with a single-channel encoder, characterized in that, Includes the following steps: Step 1: Signal Acquisition and Preprocessing: Acquire the raw A / B / Z three-phase signals output by a single-channel incremental encoder, obtain standardized differential signals through preprocessing of the raw signals, and perform constraint matching analysis until qualified signals are obtained. Step 2: Isolated signal distribution: The pre-processed standardized differential signal is electrically isolated using a pre-set opto-isolation module, splitting it into two independent signal channels, corresponding to the signal requirements of the PLC control system and the drive system, respectively. Step 3: Enhance drive transmission: Analyze the drive enhancement requirements of the drive circuit, and conduct a drive enhancement requirement evaluation analysis. Based on the evaluation output results, adjust the drive circuit to enhance the drive. Step 4: Real-time monitoring of transmission status: Set up an information acquisition device at the output of the signal distribution circuit to monitor the amplitude data, frequency data, and waveform data transmitted to the PLC control system and transmission system in real time. When the signal parameters exceed the preset threshold, an alarm will be triggered.

2. The method of claim 1, wherein the method is a method of transmitting a two-channel signal safely by replacing a two-channel encoder with a single-channel encoder, and The specific process of signal acquisition and preprocessing is as follows: The raw A / B / Z three-phase signals output by the single-channel incremental encoder are collected during operation. The collected raw A / B / Z three-phase signals are preprocessed to obtain standardized differential signals. The constraints of the standardized differential signal are obtained. These constraints include the pulse duty cycle being within a preset pulse duty cycle range and the time interval error between adjacent pulses being less than or equal to a preset threshold. The standardized differential signal is then subjected to constraint verification to determine whether it simultaneously meets the constraints. If both constraints are met, a qualified signal is generated. If not, an unqualified signal is generated. When an unqualified signal is generated, the acquired A / B / Z three-phase raw signals are reprocessed until a qualified signal is generated.

3. The dual-channel signal secure transmission method using a single-channel encoder instead of a dual-channel encoder according to claim 1, characterized in that, The analysis process for the isolated signal allocation is as follows: S1: Connect the pre-processed standardized differential signals (A+, A-, B+, B-, Z+, Z-) to the input terminal of the pre-set opto-isolation module, and control the input current through the pre-set current limiting resistor to drive the light-emitting diode inside the opto-isolation module to emit light; S2: The output of each opto-isolation module is pre-designed with two independent signal amplification circuits to convert the light signal sensed by the photosensitive element into an electrical signal and replicate it into two level signals that are completely consistent with the waveform and phase of the input signal at the input end; Simultaneously, a continuous evaluation and analysis process is conducted on the synchronization control and waveform consistency of the input signal during the replication period.

4. The dual-channel signal secure transmission method using a single-channel encoder instead of a dual-channel encoder according to claim 3, characterized in that, The continuous evaluation and analysis process is as follows: The rising / falling edge timing deviation, voltage amplitude, and pulse duty cycle (the ratio of the time the signal is at a high level to the total time of the entire cycle) of two replicated signals that have the same original signal are obtained. The timing deviation of the rising / falling edge, voltage amplitude, and pulse duty cycle are processed to obtain the results of the replication validity (valid signal) and replication invalidity (invalid signal). When a valid signal is generated, the two sets of output circuits are powered by independent isolated power supplies.

5. The dual-channel signal secure transmission method using a single-channel encoder instead of a dual-channel encoder according to claim 1, characterized in that, The process of evaluating and analyzing the enhanced demand for driving forces is as follows: T1: Let the output current of the drive circuit be L0, the cable resistance be R, and the minimum current required by the receiving end be Lmin. Then: the current reaching the receiving end after transmission is L1, L1 = L0 - (the loss current caused by the cable voltage drop). Attenuation enhancement determination analysis was performed on L1 to obtain the discrimination results of whether enhancement driving is required or not; T2: Obtain the transmission distance of the original signal (or the isolated signal), and perform enhancement judgment analysis on the transmission distance to obtain the discrimination result of whether enhancement driving is required or not; T3: Obtain the input current and output current of the input signal of the single-channel incremental encoder, and perform enhanced judgment analysis on the input current and output current to obtain the judgment result of whether enhanced driving is required or not. T4: Based on the enhancement judgment analysis of T1-T3, the number of drivers that need enhancement is obtained, and the number of drivers that need enhancement is set as the driver enhancement demand degree. At the same time, the driver enhancement demand degree is processed to obtain the signal that is not needed or the signal that is needed.

6. The dual-channel signal secure transmission method using a single-channel encoder instead of a dual-channel encoder according to claim 1, characterized in that, The analysis process for real-time monitoring of transmission status is as follows: The system acquires the amplitude, frequency, and waveform data of the output signal of the single-channel incremental encoder during operation. It also acquires the amplitude data of the five most recent historical data sets and calculates the average amplitude based on these five sets. The current amplitude index is calculated based on |amplitude data - average amplitude| / average amplitude. The system also acquires the rated frequency of the single-channel incremental encoder and calculates the current frequency index based on |frequency data - rated frequency| / rated frequency. Finally, the system acquires the total harmonic distortion rate of the waveform based on the waveform data.

7. The dual-channel signal secure transmission method using a single-channel encoder instead of a dual-channel encoder according to claim 6, characterized in that, The current amplitude index, current frequency index, and total harmonic distortion rate are processed to determine whether the real-time condition is normal or abnormal. If a real-time abnormal condition is obtained, the real-time abnormality is analyzed. If more than two real-time abnormal results occur consecutively, an alarm signal is generated.

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