Switching device for data backup and transmission and use method

Abstract

The invention relates to the technical field of data security, in particular to a switching device for data backup and transmission and a using method, and the switching device comprises a primary table which is used for generating an original digital quantity signal; the signal distributor is connected with the primary meter and is used for receiving the digital quantity signal and copying the digital quantity signal into two paths of independent signals in real time; the first data acquisition instrument is connected with the signal distributor and is used as main data acquisition equipment; the second data acquisition instrument is connected with the signal distributor and is used as standby data acquisition equipment; and the switching device is connected with the first data acquisition instrument and the second data acquisition instrument. The method has the beneficial effect that real-time dual backup of equipment and data in the data acquisition instrument can be realized. And meanwhile, in order to ensure that the distributed control system (DCS) can timely discover faults of online monitoring equipment, timely inform operation and maintenance staff to carry out fault processing and reduce fault processing response time, alarm reminding is carried out on the existing distributed control system (DCS).

Description

Technical Field

[0001] The present invention relates to the technical field of data security, and in particular to a switching device for data backup and transmission and a use method thereof. Background Art

[0002] With the continuous improvement of industrial automation level, DCS has become an indispensable part of modern factories. It realizes efficient management of production process through integrated control and data acquisition system. However, in practical application, due to various reasons, such as industrial computer crash, historical data loss, online equipment fault alarm and other primary meter failure, DCS cannot reflect the status of field equipment in a timely and accurate manner, thus affecting production efficiency and safety.

[0003] Specifically, when an industrial computer crashes or historical data is accidentally lost, it will not only affect the current operation process, but may also cause difficulties in subsequent data analysis and fault diagnosis. In addition, if an online device fails to be detected in time, it may delay maintenance, causing a small problem to turn into a major failure, which in turn affects the normal operation of the entire production line. Summary of the invention

[0004] Some simplifications or omissions may be made in this section and the abstract and title of the present application to avoid obscuring the purpose of this section, the abstract and the title of the invention, and such simplifications or omissions shall not be used to limit the scope of the present invention.

[0005] The object of the present invention is to provide a switching device for data backup and transmission.

[0006] Therefore, its purpose is to solve the problem that when the industrial computer crashes or historical data is accidentally lost, it will not only affect the current operation process, but may also cause difficulties in subsequent data analysis and fault diagnosis.

[0007] To solve the above technical problems, the present invention provides the following technical solutions: a switching device for data backup and transmission, comprising a primary table for generating an original digital signal; a signal distributor connected to the primary table for receiving the digital signal and copying it into two independent signals in real time; a first data acquisition instrument connected to the signal distributor for serving as a main data acquisition device; a second data acquisition instrument connected to the signal distributor for serving as a backup data acquisition device; a switching device connected to the first data acquisition instrument and the second data acquisition instrument for switching the data transmission link from the first data acquisition instrument to the second data acquisition instrument when a failure of the first data acquisition instrument is detected; a distributed control system "DCS" for communicating with the first data acquisition instrument and the second data acquisition instrument for monitoring the operating status of the two and triggering an alarm when a failure of the first data acquisition instrument occurs.

[0008] As a preferred solution of the switching device for data backup and transmission of the present invention, the signal distributor includes an input interface for receiving the digital signal from the primary meter; at least two output interfaces, each output interface is connected to a corresponding data acquisition instrument, and is used to losslessly copy and transmit the digital signal to the corresponding data acquisition instrument.

[0009] As a preferred solution of a switching device for data backup and transmission of the present invention, the switching device includes a detection unit for monitoring the working status of the first data acquisition instrument; a control unit connected to the detection unit, for controlling the switching operation when a failure of the first data acquisition instrument is detected, so that the data transmission link is switched from the first data acquisition instrument to the second data acquisition instrument.

[0010] As a preferred solution of a switching device for data backup and transmission of the present invention, the control unit includes two switching modes, manual and automatic. In the automatic mode, the control unit automatically completes the switching according to a preset fault judgment logic; in the manual mode, the control unit receives external instructions to execute the switching.

[0011] As a preferred solution of a switching device for data backup and transmission of the present invention, the distributed control system "DCS" includes a status monitoring module for collecting the working status information of the first data acquisition instrument and the second data acquisition instrument in real time; a fault detection module connected to the status monitoring module for analyzing the working status information and identifying potential faults; an alarm module connected to the fault detection module for generating an alarm when a fault is detected and sending the alarm information to the operation and maintenance personnel through a preset communication channel.

[0012] As a preferred solution of a switching device for data backup and transmission of the present invention, the distributed control system "DCS" also includes a user interaction interface terminal for displaying the working status of the first data acquisition instrument and the second data acquisition instrument, and providing user control options for switching operations.

[0013] As a preferred solution of the switching device for data backup and transmission of the present invention, the alarm module includes a communication failure alarm unit: triggered when the connection between the primary meter and the data acquisition instrument fails or the negative pressure of the cabinet is insufficient; a historical data loss alarm unit: triggered if 2 or 3 consecutive groups of the latest ten-minute historical data are missing from the industrial computer database; a data constant value alarm unit: triggered if the latest 5 groups of five-minute historical data in the industrial computer database show that the data has not changed.

[0014] As a preferred solution of a switching device for data backup and transmission of the present invention, the alarm module can convert the communication failure alarm unit, the historical data loss alarm unit, and the data constant value alarm unit into switch signals to facilitate display of alarm information on the distributed control system "DCS".

[0015] As a preferred solution of a switching device for data backup and transmission of the present invention, the alarm module also includes an over-standard alarm unit, and the over-standard alarm unit is combined with a data constant value alarm, that is, an alarm will be triggered when the historical data remains unchanged.

[0016] In order to solve the above technical problems, the present invention also provides the following technical solutions: a method for using a switching device for data backup and transmission, comprising a switching device for data backup and transmission, and,

[0017] The digital quantity signal from the primary meter is copied into two copies by the signal distributor, and transmitted to the first data acquisition instrument and the second data acquisition instrument respectively;

[0018] Continuously monitoring the working status of the first data acquisition instrument in the distributed control system "DCS";

[0019] When the distributed control system "DCS" detects a failure in the first data acquisition instrument, an alarm is triggered and the operation and maintenance personnel are notified;

[0020] The switching device is used to perform a switching operation from the first data acquisition instrument to the second data acquisition instrument, thereby ensuring the continuity of data transmission.

[0021] The beneficial effects of the present invention are: it can realize real-time dual backup of the equipment and data in the data acquisition instrument. At the same time, in order to ensure that the distributed control system "DCS" can timely discover the failure of the online monitoring equipment, promptly notify the operation and maintenance staff to handle the failure, reduce the response time of the failure handling, and make an alarm reminder for the existing distributed control system "DCS". It reduces the maintenance time of the failure caused by hardware connection and serial port configuration, and also reduces the failure data of the ecological environment monitoring platform, and improves the efficiency of data transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0023] Figure 1 It is a system block diagram of the present invention.

[0024] In the figure:

[0025] 100. Signal distributor; 101. First data acquisition instrument; 102. Second data acquisition instrument; 103. Switching device; 104. Distributed control system "DCS"; 105. User interaction interface terminal. DETAILED DESCRIPTION

[0026] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0027] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0028] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0029] Example 1

[0030] Reference Figure 1 , is the first embodiment of the present invention, which provides a switching device for data backup and transmission, including a primary meter for generating an original digital signal; a signal distributor (100) connected to the primary meter for receiving the digital signal and duplicating it into two independent signals in real time; a first data acquisition instrument 101 connected to the signal distributor 100 for serving as a main data acquisition device; a second data acquisition instrument 102 connected to the signal distributor 100 for serving as a backup data acquisition device; a switching device 103 connected to the first data acquisition instrument 101 and the second data acquisition instrument 102 for switching the data transmission link from the first data acquisition instrument 101 to the second data acquisition instrument 102 when a failure of the first data acquisition instrument 101 is detected; a distributed control system "DCS" 104 connected to the first data acquisition instrument 101 and the second data acquisition instrument 102 for monitoring the operating status of the two and triggering an alarm when a failure of the first data acquisition instrument 101 is detected.

[0031] In this embodiment, the primary meter serves as the input end of the system and is responsible for converting physical quantities or analog signals into digital signals. This can be any type of sensor, such as a temperature sensor, a pressure sensor, etc., which varies according to the application environment. The signal distributor 100 receives the digital signal from the primary meter and copies it into two completely independent signals in real time. The purpose of this is to ensure that even if one of the signals has a problem, the other can still work normally, thereby improving the reliability of the system.

[0032] The first data acquisition instrument 101 is used as the main data acquisition device and is connected to one output of the signal distributor 100. It is responsible for preliminary processing and storage of data. It usually has high-speed processing capabilities and can quickly respond to and process large amounts of data. The second data acquisition instrument 102: As a backup data acquisition device, it is connected to another output of the signal distributor 100. When a failure is detected in the main data acquisition instrument, the switching device 103 will automatically switch the data transmission link to the second data acquisition instrument 102 to ensure the continuity of the data acquisition process. The switching device 103 is responsible for monitoring the status of the first data acquisition instrument 101. Once a failure is detected in the main device, the switching operation is immediately performed to ensure that the data flow is seamlessly transferred to the backup device.

[0033] The distributed control system "DCS" 104 maintains communication connection with both the first data acquisition instrument 101 and the second data acquisition instrument 102, not only monitoring the operating status of both, but also triggering an alarm when the main equipment fails, reminding maintenance personnel to intervene in time.

[0034] Specifically, after startup, all components complete self-checking to ensure that they are in the best working state. The distributed control system "DCS" 104 starts to monitor the working condition of the first data acquisition instrument 101.

[0035] In the absence of failure, all data are collected, processed and stored by the first data acquisition instrument 101. At the same time, the distributed control system "DCS" 104 continuously monitors the status of the first data acquisition instrument 101 to ensure its normal operation.

[0036] When the first data acquisition instrument 101 fails, the switching device 103 responds immediately, determines the type and severity of the failure through a preset logic judgment mechanism, and then quickly switches the data transmission link from the first data acquisition instrument 101 to the second data acquisition instrument 102.

[0037] After the switch is completed, the distributed control system "DCS" 104 will trigger an alarm to notify relevant personnel. At the same time, the system enters standby mode, waiting for technicians to repair the first data acquisition instrument 101. Once the main equipment returns to normal, the switching device 103 will automatically or manually switch the data flow back to the first data acquisition instrument 101 and restore it to the initial configuration.

[0038] In another embodiment, a mechanical or solid-state relay may be used as a component of the switching device 103. When a fault is detected in the first data acquisition device 101, the control circuit activates the relay, physically disconnects the connection with the first data acquisition device 101, and simultaneously establishes a connection with the second data acquisition device 102. This method is simple and reliable, and is suitable for scenarios where the switching speed requirement is not particularly high.

[0039] In addition, in a more complex network environment, an SDN controller can be used to dynamically adjust the data flow path. Through pre-set rules, the SDN controller can quickly reconfigure the network and direct traffic to the backup path after detecting the failure of the primary path. This method is highly flexible and programmable.

[0040] Example 2

[0041] Reference Figure 1 , is the second embodiment of the present invention, which provides a switching device for data backup and transmission. The signal distributor 100 includes an input interface for receiving a digital signal from a primary meter; at least two output interfaces, each output interface is connected to a corresponding data acquisition instrument, and is used to copy the digital signal losslessly and transmit it to the corresponding data acquisition instrument. The switching device 103 includes a detection unit for monitoring the working status of the first data acquisition instrument 101; a control unit connected to the detection unit, and is used to control the switching operation when a fault of the first data acquisition instrument 101 is detected, so that the data transmission link is switched from the first data acquisition instrument 101 to the second data acquisition instrument 102. The control unit includes two switching modes, manual and automatic. In the automatic mode, the control unit automatically completes the switching according to the preset fault judgment logic; in the manual mode, the control unit receives external instructions to perform the switching.

[0042] In this embodiment, the input interface serves as the entrance of the signal distributor 100 and is responsible for receiving digital signals generated by primary meters (such as flow meters, temperature sensors, etc.). These signals are usually transmitted in the form of standard industrial protocols (such as ModbusRTU / ASCII, Profibus-DP, CANopen, etc.).

[0043] Two output interfaces, each of which can be independently connected to different data acquisition instruments. It can copy the received digital signal losslessly and transmit it synchronously to all connected data acquisition instruments. This means that even if one of the data acquisition instruments fails, the other one can continue to work normally, ensuring the continuity and reliability of data acquisition.

[0044] The detection unit continuously monitors the working status of the first data acquisition instrument 101, including but not limited to indicators such as network connection status, data transmission rate, and error rate.

[0045] The control unit periodically checks the response of the first data acquisition instrument 101 through the heartbeat packet mechanism, and immediately triggers an alarm if an abnormality is found. (The heartbeat packet mechanism is a commonly used network communication health check method, which detects the status of the communication link by periodically sending specific data packets)

[0046] When the detection unit reports that the first data acquisition instrument 101 fails, the control unit will automatically or according to the user's instruction perform a switching operation to switch the data stream from the failed device to the spare second data acquisition instrument 102 .

[0047] Automatic mode: Based on the preset fault judgment logic, for example, three consecutive heartbeat failures are regarded as faults, and the switching process is automatically completed without manual intervention.

[0048] Manual mode: allows operators to manually trigger switching through a specific interface or command line tool. It is suitable for situations where human confirmation is required.

[0049] Example 3

[0050] Reference Figure 1 , which is the third embodiment of the present invention, and this embodiment provides a switching device for data backup and transmission, and the distributed control system "DCS" 104 includes a status monitoring module for collecting the working status information of the first data acquisition instrument 101 and the second data acquisition instrument 102 in real time; a fault detection module, connected to the status monitoring module, for analyzing the working status information and identifying potential faults; an alarm module, connected to the fault detection module, for generating an alarm when a fault is detected, and sending the alarm information to the operation and maintenance personnel through a preset communication channel. The distributed control system "DCS" 104 also includes a user interaction interface terminal 105, which is used to display the working status of the first data acquisition instrument 101 and the second data acquisition instrument 102, and provide user control options for switching operations.

[0051] In this embodiment, the status monitoring module is responsible for collecting the working status information of the first data acquisition instrument 101 and the second data acquisition instrument 102 in real time, such as temperature, humidity, voltage level, signal strength, etc. This information is essential for evaluating the health status of the equipment. Advanced sensor technology and Internet of Things (IoT) protocols can be used to support multiple communication standards, such as Modbus, OPC-UA, etc., to ensure compatibility with data acquisition instruments of different brands and models.

[0052] The fault detection module works closely with the status monitoring module, using machine learning algorithms to conduct in-depth analysis of the collected working status information and automatically identify potential fault points or abnormal trends. It integrates multiple fault diagnosis models, such as rule-based expert systems, support vector machines (SVMs), random forests, etc., and combines historical data training models to improve fault prediction accuracy.

[0053] Alarm module When the fault detection module confirms that there is a fault, the alarm module will start, generate an alarm and notify the operation and maintenance personnel through the preset communication channels, including SMS, email, APP push, etc. Support multi-channel message sending to ensure the timeliness and reliability of information transmission; at the same time, different alarm levels can be set according to the severity of the fault to help the operation and maintenance team prioritize emergency situations.

[0054] The user interaction interface terminal 105 provides an intuitive and easy-to-use operation interface and also allows the user to manually perform switching operations to ensure that the service can be quickly restored when necessary.

[0055] The alarm module includes a communication failure alarm unit: triggered when the connection between the primary meter and the data acquisition instrument fails or the cabinet negative pressure is insufficient; a historical data loss alarm unit: triggered if the industrial computer database lacks 2 or 3 consecutive groups of the latest ten-minute historical data; a data constant value alarm unit: triggered if the latest 5 groups of five-minute historical data in the industrial computer database show that the data has not changed. The alarm module can convert the communication failure alarm unit, the historical data loss alarm unit, and the data constant value alarm unit into switch signals to facilitate the display of alarm information on the distributed control system "DCS" 104. The alarm module also includes an over-standard alarm unit, which is combined with the data constant value alarm, that is, the alarm will also be triggered when the historical data does not change.

[0056] In this embodiment, the communication fault alarm unit is responsible for monitoring the health status of the communication link between the primary meter and the data acquisition instrument. It checks whether the connection between the two is normal by regularly sending heartbeat signals or requesting data packets. When the connection between the primary meter and the data acquisition instrument is interrupted for more than a preset time threshold (for example, 30 seconds); or the negative pressure inside the cabinet fails to meet the safety operation requirements (for example, less than -10Pa). Once it is detected that any of the above conditions is met, the communication fault alarm unit will start immediately and output a high or low level switch signal to the distributed control system "DCS" 104 through the hardware interface, which may be accompanied by an audible and visual alarm to alert the on-site operator.

[0057] The historical data loss alarm unit is used to monitor the integrity of historical data in the industrial computer database. It determines whether there is data missing by comparing the actual received data with the expected data points.

[0058] If it is found that 2 or 3 groups of the latest ten-minute historical data are missing in succession in the industrial computer database, it is considered that a data loss event has occurred. After being triggered, the unit will also generate a switch signal to notify the distributed control system "DCS" 104, and may record the time period and related parameters of the data loss, so as to facilitate the subsequent analysis of the cause of the problem.

[0059] The data constant value alarm unit identifies abnormal stagnation that may occur during system operation. It achieves this goal by continuously monitoring data changes over a specific time period. When the latest five sets of five-minute historical data in the industrial computer database show that the data has not changed, it indicates that there may be a sensor failure or other systemic problem. At this time, the data constant value alarm unit will be activated and send the corresponding switch signal to the distributed control system "DCS" 104, and can be configured to automatically record relevant alarm information.

[0060] The over-limit alarm unit mainly focuses on whether the measured value exceeds the preset safety range. In addition, it is combined with the data constant value alarm unit to ensure that a warning can be issued in time even if the data remains unchanged for a long time.

[0061] Realize the judgment logic of exceeding the standard: when SO2 concentration>10mg / m 3 、NOx concentration>30mg / m 3 、PM concentration>5mg / m 3 The system should trigger an alarm immediately.

[0062] The alarm information includes detailed information such as the name of the exceeding substance, concentration value, exceeding time, etc., which can be conveyed to the operator through various forms such as visual (screen display) and auditory (sound prompt).

[0063] Combined with data constant value alarm, that is, when the data remains unchanged for a long time and exceeds the normal fluctuation range.

[0064] Once triggered, the unit generates a switch signal and displays an alarm message through the distributed control system "DCS" 104 interface to remind the operator to take necessary measures.

[0065] In summary, this alarm module, through the effective combination of multiple alarm units, can not only timely and accurately reflect the status changes of on-site equipment, but also provide valuable diagnostic information for maintenance personnel, greatly improving the safety and efficiency of the production process.

[0066] A method for using a switching device for data backup and transmission, wherein data is collected, processed and stored through a first data acquisition instrument 101. At the same time, a distributed control system "DCS" 104 continuously monitors the status of the first data acquisition instrument 101 to ensure its normal operation. When the first data acquisition instrument 101 fails, the switching device 103 responds immediately, determines the type and severity of the failure through a preset logical judgment mechanism, and then quickly switches the data transmission link from the first data acquisition instrument 101 to the second data acquisition instrument 102. After the switch is completed, the distributed control system "DCS" 104 will trigger an alarm to notify relevant personnel to perform maintenance.

[0067] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), installation arrangement, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure of performing the function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to numerous modifications still falling within the scope of the appended claims.

[0068] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0069] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0070] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A switching device for data backup and transmission, characterized in that: include, A primary table is used to generate the original digital signal; A signal distributor (100), connected to the primary meter, for receiving the digital signal and duplicating it in real time into two independent signals; A first data acquisition device (101), connected to the signal distributor (100), used as a main data acquisition device; A second data acquisition device (102), connected to the signal distributor (100), used as a backup data acquisition device; A switching device (103) connected to the first data acquisition instrument (101) and the second data acquisition instrument (102), and used for switching the data transmission link from the first data acquisition instrument (101) to the second data acquisition instrument (102) when a failure of the first data acquisition instrument (101) is detected; A distributed control system "DCS" (104) is connected in communication with the first data acquisition instrument (101) and the second data acquisition instrument (102) to monitor the operating status of the two and trigger an alarm when the first data acquisition instrument (101) fails.

2. A switching device for data backup and transmission as claimed in claim 1, characterized in that: The signal distributor (100) comprises: An input interface, used for receiving a digital quantity signal from the primary meter; At least two output interfaces, each of which is connected to a corresponding data acquisition instrument, are used to losslessly copy and transmit the digital quantity signal to the corresponding data acquisition instrument.

3. A switching device for data backup and transmission as claimed in claim 2, characterized in that: The switching device (103) comprises: A detection unit, used for monitoring the working state of the first data acquisition instrument (101); The control unit is connected to the detection unit and is used to control the switching operation when a failure of the first data acquisition instrument (101) is detected, so that the data transmission link is switched from the first data acquisition instrument (101) to the second data acquisition instrument (102).

4. A switching device for data backup and transmission as claimed in claim 3, characterized in that: The control unit includes two switching modes: manual and automatic. In the automatic mode, the control unit automatically completes the switching according to the preset fault judgment logic; in the manual mode, the control unit receives external instructions to execute the switching.

5. A switching device for data backup and transmission as claimed in claim 4, characterized in that: The distributed control system "DCS" (104) comprises, A status monitoring module, used for collecting working status information of the first data acquisition instrument (101) and the second data acquisition instrument (102) in real time; A fault detection module, connected to the status monitoring module, for analyzing the working status information and identifying potential faults; The alarm module is connected to the fault detection module and is used to generate an alarm when a fault is detected and send the alarm information to the operation and maintenance personnel through a preset communication channel.

6. A switching device for data backup and transmission as claimed in claim 1, characterized in that: The distributed control system "DCS" (104) also includes a user interaction interface terminal (105) for displaying the working status of the first data acquisition instrument (101) and the second data acquisition instrument (102), and providing user control options for switching operations.

7. A switching device for data backup and transmission as claimed in claim 5, characterized in that: The alarm module comprises: Communication failure alarm unit: triggered when the connection between the primary meter and the data acquisition instrument fails or the cabinet negative pressure is insufficient; Historical data loss alarm unit: triggered if two or three consecutive groups of the latest ten-minute historical data are missing from the industrial computer database; Data constant value alarm unit: Triggered if the latest 5 sets of five-minute historical data in the industrial computer database show no change in the data.

8. A switching device for data backup and transmission as claimed in claim 7, characterized in that: The alarm module can convert the communication failure alarm unit, the historical data loss alarm unit, and the data constant value alarm unit into switch signals so as to display the alarm information on the distributed control system "DCS" (104).

9. A switching device for data backup and transmission as claimed in claim 8, characterized in that: The alarm module also includes an over-standard alarm unit, which is combined with a data constant value alarm, that is, an alarm will be triggered when the historical data remains unchanged.

10. A method for using a switching device for data backup and transmission, characterized in that: A switching device for data backup and transmission comprising any one of claims 1 to 9, and: The digital quantity signal from the primary meter is copied into two copies by the signal distributor, and transmitted to the first data acquisition instrument and the second data acquisition instrument respectively; Continuously monitor the working status of the first data logger in the distributed control system "DCS"; When the distributed control system "DCS" detects a failure in the first data logger, it triggers an alarm and notifies the operation and maintenance personnel; The switching operation from the first data acquisition instrument to the second data acquisition instrument is performed by the switching device to ensure the continuity of data transmission.

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