Standby signal cable monitoring alarm

Abstract

The utility model relates to a signal standby cable monitoring alarm machine, which comprises a broken line detection module, an insulation detection module, an alarm value generation circuit, a signal comparison circuit and an alarm module, and is characterized in that the broken line detection module measures a first resistance of a standby cable and converts the first resistance into a broken line signal voltage; the insulation detection module measures a second resistance between the standby cable and the ground and converts the second resistance into an insulation signal voltage; the alarm value generation circuit generates a disconnection reference voltage and an insulation reference voltage; the signal comparison circuit compares the disconnection signal voltage with the disconnection reference voltage and outputs a cable disconnection state to the alarm module; the insulation signal voltage is compared with the insulation reference voltage, and the cable insulation state is output to the alarm module; the alarm module carries out alarm processing when the standby cable is broken or insulation is abnormal. According to the alarm machine, the signal standby cable can be accurately and comprehensively monitored and alarmed, and the monitoring timeliness and efficiency are improved.

Description

Technical Field

[0001] This utility model relates to the field of railway signaling technology, and in particular to a signal backup cable monitoring and alarm device. Background Technology

[0002] Currently, the testing method for spare core wires of signal cables is carried out by the work team according to the annual schedule. When testing the continuity of the spare cable core wires, the workers also need to go to a remote location to seal the core wires before testing. The workload is large. However, these tests still cannot detect problems such as broken wires, poor insulation to ground, or poor insulation between wires in the spare core wires of signal cables in a timely manner. Utility Model Content

[0003] Therefore, it is necessary to provide a signal backup cable monitoring and alarm device to address the problem of high workload in traditional backup cable detection methods.

[0004] A signal backup cable monitoring and alarm device includes: a line break detection module, an insulation detection module, an alarm value generation circuit, a signal comparison circuit, and an alarm module, wherein the line break detection module, the insulation detection module, the alarm value generation circuit, and the signal comparison circuit are connected;

[0005] The disconnection detection module measures the first resistance of the backup cable and converts the first resistance into a disconnection signal voltage.

[0006] The insulation detection module measures the second resistance between the backup cable and the ground, and converts the second resistance into an insulation signal voltage.

[0007] The alarm value generation circuit generates a disconnection reference voltage and an insulation reference voltage;

[0008] The signal comparison circuit compares the disconnection signal voltage with the disconnection reference voltage and outputs the cable disconnection status to the alarm module; and compares the insulation signal voltage with the insulation reference voltage and outputs the cable insulation status to the alarm module.

[0009] The alarm module will trigger an alarm when the backup cable is broken or has abnormal insulation.

[0010] The aforementioned signal backup cable monitoring and alarm device, through the combined action of a break detection module, an alarm value generation module, and a signal comparison circuit, can promptly detect whether a cable is broken and issue an alarm when a cable is broken. Similarly, through the combined action of an insulation detection module, an alarm value generation circuit, and a signal comparison circuit, it can promptly detect whether the cable insulation is normal and issue an alarm when the cable insulation is poor. Therefore, by incorporating these modules / circuits, the signal backup cable monitoring and alarm device can achieve accurate and comprehensive monitoring and alarm functions, improving the timeliness and efficiency of monitoring.

[0011] In some embodiments, the signal comparison circuit is disposed in the controller, and the alarm also includes a power supply module connected to the controller; the power supply module includes an isolation power supply for the controller, an isolation power supply for wire breakage detection, and an isolation power supply for insulation detection.

[0012] In some embodiments, the disconnection detection module includes a first signal isolation circuit; the disconnection detection isolation power supply in the power supply module is applied to both ends of the backup cable to convert the resistance characteristics of the backup cable into a disconnection detection current; and the disconnection detection current is converted into the disconnection signal voltage through the first signal isolation circuit.

[0013] In some embodiments, the insulation detection module includes a second signal isolation circuit; the insulation detection isolation power supply in the power module is applied to the spare cable and the grounding copper busbar, converting the insulation resistance characteristics of the spare cable into an insulation detection current; and the insulation detection current is converted into the insulation signal voltage through the second signal isolation circuit.

[0014] In some embodiments, the alarm value generation circuit includes:

[0015] The first resistor voltage divider circuit and voltage regulator circuit are used to generate the reference voltage for the disconnection.

[0016] The second resistor divider circuit and voltage regulator circuit are used to generate an insulation reference voltage.

[0017] In some embodiments, the signal comparison circuit includes a first operational amplifier circuit and a second operational amplifier circuit;

[0018] The first operational amplifier circuit compares the disconnection signal voltage with the disconnection reference voltage to output the cable disconnection status.

[0019] The insulation status of the cable is output by comparing the insulation signal voltage with the insulation reference voltage through the second operational amplifier circuit.

[0020] In some embodiments, the alarm module is connected to the controller, and the alarm module is also connected to the alarm device.

[0021] In some embodiments, an external resistor terminal and an external alarm value setting terminal are also included.

[0022] In some embodiments, a communication module connected to the controller and the monitoring host is also included.

[0023] In some embodiments, a touchscreen connected to the controller is also included.

[0024] In some embodiments, a storage module connected to the controller is also included. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of a signal backup cable monitoring alarm device according to one embodiment;

[0026] Figure 2 This is a schematic diagram of the structure of a wire breakage detection module according to another embodiment;

[0027] Figure 3 This is a schematic diagram of the structure of an insulation detection module according to one embodiment;

[0028] Figure 4 This is a schematic diagram of the alarm value generation circuit in one embodiment;

[0029] Figure 5 This is a schematic diagram of the signal comparison circuit in one embodiment;

[0030] Figure 6 This is a schematic diagram of an external resistor terminal in one embodiment;

[0031] Figure 7 This is a schematic diagram of the structure of a signal backup cable monitoring alarm device according to another embodiment;

[0032] Figure 8 This is a schematic diagram of the field wiring for a signal cable monitoring alarm unit according to one embodiment;

[0033] Figure 9 This is a schematic diagram illustrating the monitoring of spare core wires in 36 cables according to one embodiment. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and do not limit the scope of protection of this utility model.

[0035] like Figure 1As shown, an embodiment of this utility model provides a signal backup cable monitoring alarm, including: a broken wire detection module 110, an insulation detection module 120, an alarm value generation circuit 130, a signal comparison circuit 140, and an alarm module 150. The broken wire detection module 110, the insulation detection module 120, the alarm value generation circuit 130, and the signal comparison circuit 140 are connected.

[0036] The disconnection detection module 110 measures the first resistance of the spare cable and converts the first resistance into a disconnection signal voltage.

[0037] The insulation detection module 120 measures the second resistance between the spare cable and the ground, and converts the second resistance into an insulation signal voltage.

[0038] Alarm value generation circuit 130 generates open circuit reference voltage and insulation reference voltage;

[0039] The signal comparison circuit 140 compares the disconnection signal voltage with the disconnection reference voltage and outputs the cable disconnection status to the alarm module 150; and compares the insulation signal voltage with the insulation reference voltage and outputs the cable insulation status to the alarm module 150.

[0040] The alarm module 150 will trigger an alarm when the backup cable is broken or the insulation is abnormal.

[0041] The wire breakage detection module 110, insulation detection module 120, alarm value generation circuit 130 and signal comparison circuit 140 can be connected by circuitry.

[0042] The open circuit detection module 110 measures the first resistance of the backup cable, which can be understood as the resistance of the backup cable itself. After measuring the first resistance, the open circuit detection model converts it into an open circuit signal voltage, which serves as the basis for determining whether the backup cable is open. Similarly, the insulation detection module 120 measures the second resistance between the backup cable and the ground, i.e., the resistance to ground. After measuring the second resistance, it converts it into an insulation signal voltage, which serves as the basis for determining whether the backup cable has an insulation fault.

[0043] It is understandable that after determining the disconnection signal voltage, a reference voltage can be established. This reference voltage is then compared with the disconnection signal voltage to determine whether the cable is disconnected. Specifically, the disconnection reference voltage can be generated by the alarm value generation circuit 130. The signal comparison circuit 140 is connected to the disconnection detection module 110 and the alarm value generation circuit 130, and can acquire the disconnection signal voltage measured by the disconnection detection module 110 and the disconnection reference voltage generated by the alarm value generation circuit 130. The magnitudes of the disconnection signal voltage and the disconnection reference voltage can then be compared, and the corresponding cable disconnection status can be output to the alarm module 150 based on the comparison result. For example, the signal comparison circuit 140 can output a high-level signal or a low-level signal based on the comparison result of the disconnection signal voltage and the disconnection reference voltage; a high-level signal indicates a cable disconnection, and a low-level signal indicates that the cable is normal.

[0044] Similarly, a corresponding reference can be set for the insulation signal voltage. This reference is compared with the insulation signal voltage to determine if there is a problem with the cable insulation. Specifically, an insulation reference voltage can be generated by the alarm value generation circuit 130. The signal comparison circuit 140 is connected to the insulation detection module 120 and the alarm value generation circuit 130, and can acquire the insulation signal voltage measured by the insulation detection module 120 and the insulation reference voltage generated by the alarm value generation circuit 130. Then, the magnitudes of the insulation signal voltage and the insulation reference voltage can be compared, and the corresponding cable insulation status can be output to the alarm module 150 based on the comparison result. For example, the signal comparison circuit 140 can output a high-level signal or a low-level signal based on the comparison result of the insulation signal voltage and the insulation reference voltage; a high-level signal indicates poor cable insulation, and a low-level signal indicates normal cable insulation.

[0045] The signal comparison circuit 140 outputs the cable breakage status and cable insulation status to the alarm module 150. The alarm module 150 can determine whether the cable is broken based on the cable breakage status and whether the cable insulation is normal based on the cable insulation status, so that it can perform alarm processing when the cable is broken or the insulation is abnormal.

[0046] In some embodiments, the signal backup cable monitoring alarm of this utility model is set with five measurement modes: automatic measurement, wire breakage measurement, insulation measurement, debugging measurement, and disable measurement, making on-site testing and data review more convenient.

[0047] The signal backup cable monitoring and alarm device provided in this embodiment, through the combined action of a disconnection detection module, an alarm value generation module, and a signal comparison circuit, can promptly detect whether the cable is broken and, upon cable breakage, trigger an alarm. Similarly, through the combined action of an insulation detection module, an alarm value generation circuit, and a signal comparison circuit, it can promptly detect whether the cable insulation is normal and, upon insulation failure, trigger an alarm. Therefore, this signal backup cable monitoring and alarm device, comprising these modules / circuits, can achieve accurate and comprehensive monitoring and alarming of the signal backup cable, improving monitoring timeliness and efficiency.

[0048] In some embodiments, the signal comparison circuit is located in the controller, and the alarm also includes a power supply module connected to the controller; the power supply module includes an isolated power supply for the controller, an isolated power supply for line breakage detection, and an isolated power supply for insulation detection. Specifically, the power supply module is used to power the signal backup cable monitoring alarm. The controller may employ microcontroller technology to control the power supply and operation of each module and the touch screen.

[0049] In some embodiments, such as Figure 2 As shown, the disconnection detection module includes a first signal isolation circuit; the disconnection detection isolation power supply in the power supply module is applied to both ends of the backup cable, converting the resistance characteristics of the backup cable into a disconnection detection current; the first signal isolation circuit converts the disconnection detection current into a disconnection signal voltage. The first signal isolation circuit can be a linear isolation optocoupler. The disconnection detection module 110 applies the disconnection detection isolation power supply to both ends of the backup cable, converting the resistance characteristics of the backup cable into a disconnection detection current. The disconnection detection current is converted into a stable disconnection signal voltage by the linear isolation optocoupler and output to the signal comparison circuit 140.

[0050] In some embodiments, such as Figure 3 As shown, the insulation detection module includes a second signal isolation circuit; the insulation detection isolation power supply in the power supply module is applied to the spare cable and the grounding copper busbar, converting the insulation resistance characteristics of the spare cable into an insulation detection current; the insulation detection current is converted into an insulation signal voltage through the second signal isolation circuit. The first signal isolation circuit can be a linear isolation optocoupler. The insulation detection module 120 applies the insulation detection isolation power supply to the spare cable and the grounding copper busbar, converting the insulation resistance characteristics of the spare cable into an insulation detection current. The insulation detection current is converted into a stable insulation signal voltage through the linear isolation optocoupler and output to the signal comparison circuit 140.

[0051] In some embodiments, such as Figure 4As shown, the alarm value generation circuit includes a first resistor voltage divider circuit and a voltage regulator circuit for generating a disconnection reference voltage; and a second resistor voltage divider circuit and a voltage regulator circuit for generating an insulation reference voltage. Specifically, the "alarm value generation circuit" is a resistor voltage divider and voltage regulator circuit that converts the internal DC voltage into the required reference voltage. The internal DC voltage can be understood as the voltage input to the controller. Resistor voltage division refers to converting the internal DC voltage into the required voltage through resistors. For example, if the internal DC voltage is 5VDC and the required reference voltage is 2.5VDC, two 10k resistors can be connected in series for voltage division, and the voltage across each 10k resistor is the required 2.5VDC voltage. The voltage regulator circuit provides a stable output voltage, unaffected by the input voltage or load current. In this embodiment, corresponding voltage divider and voltage regulator circuits are set for the disconnection and insulation parts respectively. The voltage divider and voltage regulator circuits for the disconnection detection part are denoted as the first resistor voltage divider and voltage regulator circuit, used to generate the disconnection reference voltage. The voltage divider and voltage regulator circuits in the insulation detection section are referred to as the second resistor voltage divider and voltage regulator circuits, and are used to generate the insulation reference voltage.

[0052] In some embodiments, such as Figure 5 As shown, the signal comparison circuit includes a first operational amplifier circuit and a second operational amplifier circuit. The first operational amplifier circuit compares the disconnection signal voltage with the disconnection reference voltage to output the cable disconnection status. The second operational amplifier circuit compares the insulation signal voltage with the insulation reference voltage to output the cable insulation status. Specifically, the "signal comparison circuit" uses the first operational amplifier circuit to determine the magnitude of the voltage values ​​of the "disconnection signal voltage" and the "disconnection reference voltage," outputting a high-level or low-level signal; a high-level signal represents a cable disconnection, and a low-level signal represents a normal cable. Similarly, the signal comparison circuit 140 uses the same principle as the disconnection detection to determine the "insulation signal voltage" and the "insulation comparison voltage," outputting a high-level or low-level signal based on the voltage value; a high-level signal represents poor cable insulation, and a low-level signal represents normal cable insulation. Thus, the disconnection status and insulation status of the spare cable are determined by the output of the signal comparison circuit.

[0053] In some embodiments, the alarm module is connected to the controller and also to an alarm device. Specifically, the alarm module provides a normally closed relay contact to output the abnormal cable status to other devices, such as an alarm device, when a backup cable is broken or has poor insulation. The alarm device can be an audible and visual alarm device, such as a buzzer, LED, or flashing light. The alarm module is used to output the corresponding abnormal status to the alarm device in the event of a backup cable break or insulation failure, so that the alarm device can trigger an alarm.

[0054] In some embodiments, an external resistor terminal and an external alarm value setting terminal are also included. Specifically, the monitoring alarm parameters are modifiable: if the monitoring alarm parameters need to be modified due to special natural environments on site, a calculated external resistor can be added through the external resistor terminal to adapt the open circuit and insulation monitoring alarm parameters set by the monitoring alarm device to special circumstances, such as... Figure 6 The diagram shows a schematic of the external resistor terminals. The "external alarm value setting terminal" is used to externally modify the alarm value (i.e., the disconnection reference voltage and the insulation reference voltage). In other words, the reference voltage generated by the alarm value generation circuit 130 is affected by the external alarm value setting terminal, which supports external modification of the judgment criteria for disconnection faults and insulation failure faults.

[0055] In some embodiments, a communication module connected to the controller and the monitoring host is also included. The communication module may use RS-485 communication to communicate with the monitoring host, supporting the monitoring host in reading the detection data and setting parameters of the signal backup cable monitoring alarm.

[0056] In some embodiments, a touchscreen connected to the controller is also included. The main function of the touchscreen is human-machine interaction, facilitating personnel to query equipment status, set equipment parameters, and control equipment operation. The touchscreen allows users to modify the system time, the name of the cable under test, and view monitoring records.

[0057] In some embodiments, a storage module connected to the controller is also included. The storage module is used to store the detection data (including disconnection signal voltage, insulation signal voltage, disconnection reference voltage, insulation reference voltage, etc.) and set parameters of the signal backup cable monitoring alarm, so as to ensure that the data is not lost when the signal backup cable monitoring alarm is powered off.

[0058] When testing the continuity of backup cable cores, operators need to travel to a remote location to seal the cores before testing, resulting in a large workload. However, these tests still cannot promptly detect issues such as broken backup cores, poor insulation to ground, or inadequate insulation between wires. Furthermore, when a signal cable core fails, operators must first test and confirm the backup cable cores are functioning correctly before reconnecting, increasing the time required for backup core connection and leading to slow and prolonged signal cable fault handling. Therefore, the backup cable monitoring and alarm device provided by this invention not only accurately and comprehensively monitors and alarms backup signal cables but also provides technical support for reducing signal cable fault delays.

[0059] To more clearly illustrate the embodiments of this utility model, the following will be combined with Figure 7 Further explanation is needed. For example... Figure 7 The diagram shown is a schematic representation of the overall structure of the signal backup cable monitoring and alarm device, including:

[0060] (1) "Power supply module", used to supply power to the machine, including isolated power supply for controller, isolated power supply for wire breakage detection, and isolated power supply for insulation detection.

[0061] (2) The “disconnection detection module” measures the resistance of the spare cable and generates a disconnection detection module signal. The “disconnection detection module” applies the disconnection detection power supply to both ends of the spare cable and converts the resistance characteristics of the spare cable into a disconnection detection current. The disconnection detection current is converted into a stable “disconnection signal voltage” through a signal isolation circuit.

[0062] (3) The "insulation detection module" measures the insulation resistance between the spare cable and the grounding copper busbar and generates an insulation detection module signal. The "insulation detection module" applies insulation detection power to the spare cable and the grounding copper busbar, converting the insulation resistance characteristics of the spare cable into insulation detection current. The insulation detection current is converted into a stable "insulation signal voltage" through a signal isolation circuit.

[0063] (4) The "alarm value generation circuit" generates a disconnection reference signal, which is compared with the signal from the disconnection detection module to determine whether the cable has been disconnected; and generates an insulation reference signal, which is compared with the signal from the insulation detection module to determine whether the cable has insulation defects. The alarm value generation circuit includes a resistor voltage divider and a voltage regulator circuit, which can convert the internal DC voltage into the required "disconnection reference voltage" and "insulation reference voltage".

[0064] The reference signal generated by the "alarm value generation circuit" is affected by the "alarm value external setting terminal", which means that it supports external modification of the judgment criteria for open circuit faults and poor insulation faults.

[0065] (5) The three-way signal comparison circuit (i.e. the signal comparison circuit 140 in the above embodiment) uses the first operational amplifier circuit to determine the voltage value of the "disconnection signal voltage" and the "disconnection reference voltage", and outputs a high-level or low-level signal; the high-level signal represents that the cable is disconnected, and the low-level signal represents that the cable is normal.

[0066] The "three-way signal comparison circuit" uses the second operational amplifier circuit to determine the "insulation signal voltage" and "insulation reference voltage" in the same way as the open circuit detection. It outputs a high-level or low-level signal based on the voltage value. A high-level signal indicates poor cable insulation, while a low-level signal indicates normal cable insulation.

[0067] (6) The “Extended alarm module” (corresponding to the alarm module 150 in the above embodiment) provides a normally closed relay node, which outputs the abnormal status to other devices, such as external sound and light alarm devices, when a backup cable is broken or insulation is faulty.

[0068] (7) The “485 communication module” supports the microcomputer monitoring system to read local detection data and set system parameters.

[0069] (8) The “controller” is the core module of the equipment, which controls the operation and power supply of each module.

[0070] (9) The main function of the touch screen is human-computer interaction, which makes it convenient for people to check the equipment status, set equipment parameters and control the operation of the equipment.

[0071] (10) The “Storage Module” stores the device settings parameters and the insulation detection data of the broken wires, ensuring that the data is not lost when the device is powered off.

[0072] Spare signal cable, junction box and outdoor terminal loop connection.

[0073] like Figure 8 The diagram shown is a schematic of the on-site wiring for a signal cable monitoring alarm. After connecting all the spare core wires of the cable in series, the wiring can be completed by matching them to the corresponding terminals at the rear.

[0074] like Figure 9 The diagram shown illustrates the monitoring of spare core wires for 36 cables, which can be used for monitoring spare signal cables in general station sections and within stations.

[0075] The above scheme uses an isolation circuit to convert the detection current into a detection voltage, which is then compared with a reference voltage to detect cable breaks and insulation. The reference voltage is calculated, the break resistance determines the detection current, and the detection current determines the detection voltage. Therefore, the detection voltage (such as the break signal voltage) should theoretically be equal to the reference voltage (such as the break reference voltage). Thus, an alarm can be triggered when the actual break resistance is less than the theoretical break resistance, and only when it is greater than the theoretical break resistance. Insulation detection is similar to break detection. For example, if the total length of a single-core return line of the spare cable is ≤100KM, the break resistance alarm parameter is ≥6KΩ, and the alarm parameters for the spare core wire insulation to ground and inter-line insulation resistance are ≤18KΩ, an alarm will be triggered promptly when the cable break monitoring and insulation monitoring exceed these parameters, providing technical support for the early handling of problematic signal cable spare lines.

[0076] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0077] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A signal backup cable monitoring and alarm device, characterized in that, include: The system includes a wire breakage detection module, an insulation detection module, an alarm value generation circuit, a signal comparison circuit, and an alarm module, wherein the wire breakage detection module, the insulation detection module, the alarm value generation circuit, and the signal comparison circuit are connected together. The disconnection detection module measures the first resistance of the backup cable and converts the first resistance into a disconnection signal voltage. The insulation detection module measures the second resistance between the backup cable and the ground, and converts the second resistance into an insulation signal voltage. The alarm value generation circuit generates a disconnection reference voltage and an insulation reference voltage; The signal comparison circuit compares the disconnection signal voltage with the disconnection reference voltage and outputs the cable disconnection status to the alarm module. Furthermore, by comparing the insulation signal voltage with the insulation reference voltage, the cable insulation status is output to the alarm module; The alarm module will trigger an alarm when the backup cable is broken or has abnormal insulation.

2. The alarm device according to claim 1, characterized in that, The signal comparison circuit is located in the controller, and the alarm also includes a power module connected to the controller. The power module includes an isolated power supply for the controller, an isolated power supply for wire breakage detection, and an isolated power supply for insulation detection.

3. The alarm device according to claim 2, characterized in that, The disconnection detection module includes a first signal isolation circuit; The disconnection detection isolation power supply in the power module is applied to both ends of the backup cable, converting the resistance characteristics of the backup cable into a disconnection detection current; the disconnection detection current is converted into a disconnection signal voltage through the first signal isolation circuit.

4. The alarm device according to claim 2, characterized in that, The insulation detection module includes a second signal isolation circuit; The insulation detection isolation power supply in the power module is applied to the backup cable and the grounding copper busbar, converting the insulation resistance characteristics of the backup cable into an insulation detection current; the insulation detection current is then converted into the insulation signal voltage through the second signal isolation circuit.

5. The alarm device according to claim 1, characterized in that, The alarm value generation circuit includes: The first resistor voltage divider circuit and voltage regulator circuit are used to generate the reference voltage for the disconnection. The second resistor divider circuit and voltage regulator circuit are used to generate an insulation reference voltage.

6. The alarm device according to claim 1, characterized in that, The signal comparison circuit includes a first operational amplifier circuit and a second operational amplifier circuit; The first operational amplifier circuit compares the disconnection signal voltage with the disconnection reference voltage to output the cable disconnection status. The insulation status of the cable is output by comparing the insulation signal voltage with the insulation reference voltage through the second operational amplifier circuit.

7. The alarm device according to any one of claims 1-6, characterized in that, The alarm module is connected to the controller and also to the alarm device.

8. The alarm device according to any one of claims 1-6, characterized in that, It also includes external resistor terminals and external alarm value setting terminals.

9. The alarm device according to any one of claims 1-6, characterized in that, It also includes a communication module connected to the controller, which is connected to the monitoring host.

10. The alarm device according to any one of claims 1-6, characterized in that, It also includes a touchscreen and a storage module that connect to the controller.

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