A continuity detection device for DP networks

Abstract

This application proposes a continuity detection device for a DP network, relating to the field of industrial automation control technology. The system includes: a signal generating device, a signal acquisition module, a signal processing module, and an alarm execution module, wherein: the signal generating device is used to generate periodic physical signals; the input terminal of the signal acquisition module is connected to the DP network to acquire the physical signals through the DP network and obtain the signal status of the physical signals; the signal processing module is connected to the output terminal of the signal acquisition module; the signal processing module is used to receive the signal status and generate a fault judgment signal based on the signal status; the alarm execution module is connected to the signal processing module; the alarm execution module is used to receive the fault judgment signal and execute an alarm or equipment interlock action based on the fault judgment signal.

Description

Technical Field

[0001] This utility model relates to the field of industrial automation control technology, and in particular to a continuity detection device for DP networks. Background Technology

[0002] In industrial automation control systems, DP (Decentralized Periphery Network) is widely used as the core fieldbus standard to connect programmable logic controllers (PLCs) and distributed I / O devices. The communication status of this network directly determines the stable and safe operation of production equipment. However, in real industrial environments, DP networks often experience communication interruptions or signal transmission errors due to aging wiring, electromagnetic interference, and other reasons, necessitating effective real-time monitoring methods to ensure production safety.

[0003] Currently, monitoring the connectivity of DP networks primarily relies on stand-alone network diagnostic software systems. These solutions typically require dedicated monitoring computers, are expensive, and their alarm information is usually only displayed in a central monitoring room far from the production site, making it difficult for equipment maintenance personnel to detect and locate faults immediately. Furthermore, existing solutions generally suffer from the inability to automatically reset alarm information, difficulty for non-professionals to understand abstract fault codes, and, most importantly, a lack of direct interlock between alarm signals and field equipment operation, failing to immediately execute protective operations such as shutdowns when a fault occurs, posing safety hazards. Utility Model Content

[0004] This application provides a continuity detection device for DP networks, which can simply and cost-effectively detect the continuity of DP networks and establish alarms and interlocks with the operation of field equipment, thereby improving the stable operation of the equipment.

[0005] This application proposes a continuity detection device for DP networks, comprising: a signal generator, a signal acquisition module, a signal processing module, and an alarm execution module, wherein: The signal generating device is used to generate periodic physical signals; The input terminal of the signal acquisition module is connected to the DP network to acquire the physical signal through the DP network and obtain the signal state of the physical signal; The signal processing module is connected to the output terminal of the signal acquisition module; the signal processing module is used to receive the signal status and generate a fault judgment signal based on the signal status; The alarm execution module is connected to the signal processing module; the alarm execution module is used to receive the fault judgment signal and execute alarm or equipment interlocking actions based on the fault judgment signal.

[0006] Optionally, the signal state includes a first signal state and a second signal state, wherein: The input terminal of the signal acquisition module is connected to the first network segment and the second network segment of the DP network, respectively, so as to obtain the first signal state of the physical signal through the first network segment and the second signal state of the physical signal through the second network segment.

[0007] Optionally, the signal processing module is further configured to: Receive the first signal state and the second signal state; Compare whether the first signal state and the second signal state are consistent; If the first signal state is inconsistent with the second signal state, then the fault judgment signal is generated.

[0008] Optionally, the signal processing module is further configured to: After taking the first signal state as positive and the second signal state as negative, a series logic judgment is performed. If the series circuit is connected, it is determined that the first signal state and the second signal state are inconsistent.

[0009] Optionally, the signal generating device includes: Electric motor; A stop is fixedly installed on the rotating shaft of the motor; A proximity switch, wherein the sensing surface of the proximity switch is disposed opposite to the rotation trajectory of the stop; the proximity switch is used to generate a physical signal in the form of a pulse when the stop rotates closer.

[0010] Optionally, the continuity detection device for DP networks further includes a base bracket; the motor and the proximity switch are fixedly mounted via the base bracket.

[0011] Optionally, the motor is a 24V adjustable speed motor, and the speed of the motor is configured to rotate once every 6 seconds.

[0012] Optionally, the alarm execution module includes a human-machine interface alarm unit, which is used to display text alarm information containing the location of the faulty network segment on the operation interface when the fault judgment signal is received.

[0013] Optionally, the alarm execution module further includes a device interlocking control unit, which is used to stop the operation of the devices connected to the DP network when the fault judgment signal is received.

[0014] Optionally, the signal processing module is further configured to start timing after generating the fault judgment signal; if the first signal state and the second signal state return to consistency within a preset time, the fault judgment signal is automatically cancelled; if the first signal state and the second signal state are still inconsistent after the preset time, the fault judgment signal is maintained and the alarm execution module is triggered.

[0015] The continuity detection device for DP networks proposed in this application, by introducing an independent signal generator and utilizing the unique structure of DP networks with multi-segment parallel transmission and comparison, achieves real-time, automatic, and highly reliable monitoring of network continuity status. This effectively overcomes the shortcomings of existing software detection schemes, such as high cost, inconvenient viewing of alarm information, and inability to interlock with equipment. The device has a simple structure and only requires a small amount of additional hardware to utilize existing control system resources to achieve fault diagnosis and safety protection functions, significantly reducing implementation costs. At the same time, its judgment mechanism based on hardware signal state differences fundamentally avoids false alarms and missed alarms, ensuring the stable and safe operation of the production system.

[0016] The present application provides a continuity detection device for DP networks. Other advantages, objectives and features of this application will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this application. Attached Figure Description

[0017] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of exemplary embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 A schematic diagram of the structure of a continuity detection device for a DP network provided in an embodiment of this application; Figure 2 This is a schematic diagram of the structure of a signal generating device provided in an embodiment of this application; Figure 3 A flowchart illustrating the working principle of a continuity detection device for a DP network provided in an embodiment of this application; in, Figure 1 The correspondence between the reference numerals in the attached drawings and the names of the components is as follows: 10 Signal Generator; 20 Signal Acquisition Module; 30 Signal Processing Module; 40 Alarm Execution Module; Figure 2 The correspondence between the reference numerals in the attached drawings and the names of the components is as follows: 1. Motor; 2. Stop; 3. Proximity switch; 4. Base bracket. Detailed Implementation

[0018] To better understand the technical solutions provided in the embodiments of this specification, the technical solutions of the embodiments of this specification will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments of this specification and the specific features in the embodiments are detailed descriptions of the technical solutions of the embodiments of this specification, rather than limitations on the technical solutions of this specification. In the absence of conflict, the embodiments of this specification and the technical features in the embodiments can be combined with each other.

[0019] In this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, without necessarily requiring or implying any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. The term "two or more" includes two or more cases.

[0020] Currently, DP network monitoring primarily relies on dedicated monitoring devices independent of the field automation system. Alarm information can only be displayed remotely on a separate POC (Point of Control) monitoring unit in the electrical room, far from the actual production site, making it extremely inconvenient for personnel to view. Furthermore, the lack of dedicated personnel for 24-hour continuous monitoring means communication alarm problems cannot be detected promptly, easily escalating the impact of accidents. In addition, the alarm function of this monitoring device has significant shortcomings: it cannot automatically reset or filter alarm information, resulting in a large accumulation of historical alarms on the POC monitoring unit, severely interfering with fault diagnosis efficiency. Simultaneously, the lack of an interlocking mechanism between alarm signals and field equipment means that equipment cannot be stopped promptly when communication anomalies occur, posing a safety hazard. Moreover, alarm information is presented only in serial number form, making it difficult for non-professionals to directly identify the specific fault location, increasing maintenance difficulty. Finally, such independently operating monitoring software systems are typically expensive, further increasing the cost burden on enterprises.

[0021] In view of this, this application provides a continuity detection device for DP networks, which can simply and cost-effectively detect the continuity of DP networks and establish alarms and interlocks with the operation of field equipment, thereby improving the stable operation of the equipment.

[0022] According to an embodiment of this application, this application proposes a continuity detection device for DP networks, see [link to relevant documentation]. Figure 1 It includes: a signal generating device 10, a signal acquisition module 20, a signal processing module 30, and an alarm execution module 40, wherein: The signal generator 10 is used to generate periodic physical signals; The input terminal of the signal acquisition module 20 is connected to the DP network to acquire physical signals through the DP network and obtain the signal status of the physical signals; The signal processing module 30 is connected to the output terminal of the signal acquisition module 20; the signal processing module 30 is used to receive the signal status and generate a fault judgment signal based on the signal status. The alarm execution module 40 is connected to the signal processing module 30; the alarm execution module 40 is used to receive fault judgment signals and execute alarm or equipment interlocking actions based on the fault judgment signals.

[0023] For example, this application provides a continuity detection device for a DP network, comprising a signal generator 10, a signal acquisition module 20, a signal processing module 30, and an alarm execution module 40. It uses a continuously changing physical signal, independent of normal DP network service data, as the detection source, and simultaneously injects this signal into different network segments of the DP network to be monitored for transmission. The device uses the signal acquisition module 20 to capture the signal status in real time after transmission through each network segment and sends it to the signal processing module 30 for logical comparison. The signal processing module 30 analyzes and compares the consistency of the signal status transmitted by each network segment to determine the continuity health of the network communication channel—if there is a difference in the signal status, it indicates that a certain network segment has failed and cannot transmit the changing signal normally. Finally, the device generates a fault judgment signal and triggers the alarm execution module 40 to realize on-site audible and visual alarms or equipment safety interlocks, thereby achieving real-time, automatic, and low-cost effective monitoring of the DP network status.

[0024] This application provides a continuity detection device for DP networks. By employing an independent hardware signal generator 10 to generate periodic physical signals and utilizing an innovative structure of parallel transmission and acquisition comparison across multiple DP network segments, it achieves real-time and automated monitoring of the communication status of industrial fieldbuses. This device effectively overcomes the drawbacks of traditional methods that rely on dedicated software and independent monitoring computers, such as high cost, low real-time performance, and inconvenience in viewing alarm information. Its signal state difference-based comparison mechanism significantly improves the accuracy and reliability of fault diagnosis, and can promptly trigger intuitive text alarms and equipment safety interlock actions. This greatly lowers the threshold for non-professionals to identify and handle faults, while fully utilizing existing control system resources to significantly improve the operational stability and safety of the entire automation system at extremely low additional costs.

[0025] In some examples, the signal state includes a first signal state and a second signal state, wherein: The input terminals of the signal acquisition module 20 are connected to the first network segment and the second network segment of the DP network, respectively, so as to obtain the first signal state of the physical signal through the first network segment and the second signal state of the physical signal through the second network segment.

[0026] For example, the signal state includes a first signal state and a second signal state. The input terminals of the signal acquisition module 20 are respectively connected to the first network segment and the second network segment of the DP network. It acquires physical signals through the first network segment and converts them into the first signal state, and simultaneously acquires the same physical signals through the second network segment and converts them into the second signal state. The signal processing module 30 receives the first signal state and the second signal state and compares them. If the first signal state and the second signal state are inconsistent, it indicates that at least one of the first network segment and the second network segment has a continuity or disconnection abnormality, and a fault judgment signal is then generated.

[0027] This application utilizes a multi-segment signal parallel acquisition and comparison method, enabling the device to accurately locate the specific network segment experiencing a continuity / disconnection fault and generate clear and intuitive text alarm information. This significantly reduces the professional skill requirements for operators in fault identification and location. Simultaneously, through hardware-level signal status comparison and interlocking triggering mechanisms, it ensures high real-time performance and high reliability in fault response, fundamentally avoiding the production safety risks caused by alarm information delays, omissions, or misjudgments in traditional solutions. Ultimately, it achieves low-cost, highly available DP network status monitoring and protection functions with a simple and reliable hardware structure.

[0028] In some examples, the signal processing module 30 is also used for: Receive the first signal state and the second signal state; Compare whether the first signal state and the second signal state are consistent; If the first signal state is inconsistent with the second signal state, a fault judgment signal is generated.

[0029] In some examples, the signal processing module 30 is also used for: After taking the first signal state as positive and the second signal state as negative, a series logic judgment is performed. If the series circuit is connected, it is determined that the first signal state and the second signal state are inconsistent.

[0030] For example, the signal processing module 30 is used to receive a first signal state and a second signal state, and compare and analyze them. The specific comparison method is as follows: the first signal state from the first network segment is positive, and the second signal state from the second network segment is negative. Then, the positive first signal state and the negative second signal state are connected in series to form a judgment loop. The signal processing module 30 completes the comparison operation by monitoring whether the judgment loop is conductive. If the series loop is conductive, it indicates that the first signal state and the second signal state are inconsistent.

[0031] Once the inconsistency between the two signal states is determined through the above method, the signal processing module 30 generates a fault judgment signal, which indicates that at least one of the first and second network segments has experienced a continuity fault. This series continuity judgment method based on hardware circuit logic has a clear physical concept, avoids the complexity and uncertainty that may exist in software programs, and provides a simple and reliable implementation path for fault detection.

[0032] This comparison and judgment method based on the principles of inversion and series conduction provides an extremely stable and intuitive hardware-level fault detection mechanism. This mechanism directly reflects network communication anomalies through the circuit's on / off state, with high real-time response. It does not rely on complex software algorithms and expensive processing chips, which greatly reduces the implementation cost and power consumption of the device. At the same time, the determinism of its hardware logic also ensures anti-interference and reliability when working in harsh industrial electromagnetic environments.

[0033] In some examples, such as Figure 2 As shown, the signal generating device 10 includes: Motor 1; The stop 2 is fixedly installed on the rotating shaft of the motor 1; The proximity switch 3 has its sensing surface positioned relative to the rotation trajectory of the stop 2; the proximity switch 3 is used to generate a pulse-shaped physical signal when the stop 2 rotates closer.

[0034] In some examples, the continuity detection device for DP networks provided in this application also includes a base bracket 4; the motor 1 and the proximity switch 3 are fixedly mounted via the base bracket 4.

[0035] In some examples, motor 1 is a 24V adjustable speed motor, and the speed of motor 1 is configured to rotate once every 6 seconds.

[0036] For example, the signal generating device 10 includes three core components: a motor 1, a stop 2, and a proximity switch 3. The motor 1 is a 24V DC adjustable speed motor, and a metal stop 2 is fixedly welded to its rotating shaft. The stop 2 rotates together with the rotating shaft of the motor 1. The proximity switch 3 is bolted to the base bracket 4 or mounting plate, such that the sensing surface of the proximity switch 3 is positioned relative to the rotation trajectory of the stop 2. The distance between the sensing surface of the proximity switch 3 and the rotation trajectory of the stop 2 is precisely adjusted within the effective sensing distance range of the proximity switch 3, thereby ensuring that the proximity switch 3 is reliably triggered once per revolution of the stop 2.

[0037] Motor 1 is configured to operate at a constant speed of one revolution every 6 seconds. When the stop 2 rotates with the rotating shaft of motor 1 to a position close to the sensing surface of proximity switch 3, the internal circuit state of proximity switch 3 changes and outputs a pulse-shaped physical signal. This pulse signal serves as a detection source characterizing the on / off state of the DP network and is synchronously transmitted to the first and second network segment entrances of the DP network, providing a periodically changing signal source for subsequent signal acquisition and comparison.

[0038] This signal generator 10, through the combination of mechanical structure and electrical components, generates a continuous and regularly changing physical signal, providing a hardware-level signal source for network continuity detection that is unaffected by software operation status, fundamentally ensuring the independence and reliability of the detection benchmark. At the same time, the device has a simple structure, requiring only a common motor and proximity switch 3, without the need for complex circuits or dedicated signal generators, significantly reducing hardware costs. Furthermore, its output pulse signal is easily acquired and transmitted by standard DP network modules, perfectly adapting to existing hardware environments in industrial settings, ultimately achieving automated generation of detection signals at extremely low additional costs.

[0039] In some examples, the alarm execution module 40 includes a human-machine interface alarm unit, which is used to display text alarm information containing the location of the faulty network segment on the operation interface when a fault judgment signal is received.

[0040] For example, the alarm execution module 40 includes a human-machine interface alarm unit, which is communicatively connected to the signal processing module 30. When the signal processing module 30 generates a fault judgment signal, the signal is transmitted to the human-machine interface alarm unit in real time to trigger its alarm display program. The human-machine interface alarm unit converts the abstract fault judgment signal into text alarm information containing a specific fault network segment identifier (such as "DP network first network segment communication interruption" or "second network segment signal abnormality") according to a preset alarm information mapping relationship, and pushes the text information to the prominent alarm area of ​​the on-site operation interface for display in real time.

[0041] In addition to specifying the specific faulty network segment, the text alarm message may also include additional information such as the time of the fault occurrence and suggested handling measures; the alarm message continues to be displayed until the fault is resolved and the signal processing module 30 cancels the fault judgment signal, and then automatically disappears without manual reset operation; this human-machine interface alarm unit is integrated with the field control system through configuration software, and can directly utilize the existing operator station hardware resources without the need for additional dedicated display equipment.

[0042] This human-machine interface alarm unit completely solves the problem that traditional detection devices can only provide abstract fault codes, making it difficult for on-site personnel to quickly locate faults. The text information directly indicates the location of the faulty network segment, significantly reducing the professional skills required for maintenance personnel and shortening the fault identification and handling time. At the same time, its automatic clearing mechanism avoids the interference caused by the accumulation of historical alarm information. Ultimately, by improving the understandability and usability of alarm information, it effectively ensures the continuous and stable operation of the production system.

[0043] In some examples, the alarm execution module 40 also includes a device interlock control unit, which is used to stop the operation of devices connected to the DP network when a fault judgment signal is received.

[0044] For example, the alarm execution module 40 also includes a device interlock control unit, which is directly connected to the fault judgment signal output terminal of the signal processing module 30. When the device interlock control unit receives the fault judgment signal sent by the signal processing module 30, it immediately outputs a safety shutdown control signal to the control system of the device connected to the DP network. The shutdown signal is transmitted to the main controller of the device through a hard-wired connection or communication protocol command to forcibly interrupt the device operation process and realize emergency shutdown protection.

[0045] The equipment interlocking control unit is implemented using a relay circuit or a safety PLC module. Its output interface is directly connected to the emergency stop circuit or control program interlocking point of the field equipment to ensure that the execution priority of the stop signal is the highest and the response delay is the shortest. The interlocking action is maintained until the fault judgment signal is canceled by the signal processing module 30, and only then is manual confirmation allowed to resume equipment operation, thereby avoiding the accidental start of the equipment before the fault is eliminated.

[0046] This equipment interlocking control unit completely solves the safety hazard of independent alarm and equipment control in traditional detection schemes by establishing a direct hardware association between fault judgment signals and equipment shutdown. It achieves millisecond-level rapid response from fault detection to safety protection. This mechanism can automatically execute shutdown operations without manual intervention, effectively preventing equipment malfunctions or production accidents caused by network communication failures, and significantly improving the inherent safety level and operational reliability of the entire production system.

[0047] In some examples, the signal processing module 30 is also used to start timing after generating the fault judgment signal. If the first signal state and the second signal state return to the same state within a preset time, the fault judgment signal is automatically cancelled. If the first signal state and the second signal state are still inconsistent after the preset time, the fault judgment signal is maintained and the alarm execution module 40 is triggered.

[0048] For example, the signal processing module 30 also includes a timing judgment function, which is manifested as follows: when the module generates a fault judgment signal, it immediately starts an internal timer to start timing. The preset time of the timer can be set by configuration parameters according to the on-site working conditions. Within the preset time range, the signal processing module 30 continuously compares the actual values ​​of the first signal state and the second signal state. If the two signal states return to the same state within this time period, it is determined to be a momentary interference and the previously generated fault judgment signal is automatically canceled.

[0049] If the first signal state and the second signal state remain inconsistent after the timer reaches the preset time threshold, the signal processing module 30 confirms that the fault is a continuous on / off anomaly. At this time, the fault judgment signal is maintained in a valid state and the signal is transmitted to the alarm execution module 40 to trigger subsequent alarm and equipment interlocking actions. In the entire judgment process, the preset time parameter of the timer serves as a key threshold for distinguishing between instantaneous interference and real faults. Its value setting needs to take into account the network transmission characteristics and equipment process requirements.

[0050] This timing judgment function, by introducing a time-dimensional verification mechanism, can effectively filter out false alarms caused by on-site electromagnetic interference or instantaneous signal jitter, significantly improving the system's anti-interference capability and detection accuracy. At the same time, this function ensures that only persistent real faults will trigger equipment shutdown and other interlocking actions, avoiding unplanned shutdowns caused by instantaneous anomalies during production, and fundamentally improving the continuous operation stability and operational economy of the production system.

[0051] In summary, the continuity detection device for DP networks provided in this application, by introducing an independent signal generator 10 and utilizing the unique structure of DP networks with multi-segment parallel transmission and comparison, achieves real-time, automatic, and highly reliable monitoring of network continuity status. This effectively overcomes the shortcomings of existing software detection schemes, such as high cost, inconvenient viewing of alarm information, and inability to interlock with equipment. The device has a simple structure and only requires a small amount of additional hardware to utilize existing control system resources to achieve fault diagnosis and safety protection functions, significantly reducing implementation costs. At the same time, its judgment mechanism based on hardware signal state differences fundamentally avoids false alarms and missed alarms, ensuring the stable and safe operation of the production system.

[0052] In one specific implementation, such as Figure 3As shown, a modified 24V adjustable speed motor first drives the welded stop 2 to rotate, triggering the proximity switch 3 every 6 seconds, thereby generating a periodic pulse signal with a frequency of 10 times / minute. This physical signal is simultaneously transmitted through two different network segments of the DP network (such as network segment 1 and network segment 2). After being collected by each network segment, a first signal state and a second signal state are formed respectively. During signal processing, the first signal state is positive and the second signal state is negative, and they are connected in series to form a judgment loop. The signal consistency is judged by detecting whether the loop is conductive: if the series loop is not conductive, it indicates that the two signal states are consistent, the network communication is judged to be normal, and the loop detection continues; if the series loop is conductive, it indicates that the signal states are inconsistent, the DP network is immediately judged to have a continuity fault, triggering the on-site operation interface to display the text alarm information of the specific fault network segment location, and simultaneously activating the equipment interlock control unit to stop the operation of related equipment, thereby realizing fully automatic processing from fault detection to safety protection.

[0053] It should be noted that the descriptions of each embodiment in the above embodiments have different focuses. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0054] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

[0055] Although preferred embodiments have been described in this specification, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this specification.

[0056] Obviously, those skilled in the art can make various modifications and variations to this specification without departing from its spirit and scope. Therefore, if such modifications and variations fall within the scope of the claims and their equivalents, this specification is also intended to include such modifications and variations.

Claims

1. A continuity detection device for DP networks, characterized in that, include: The system comprises a signal generating device, a signal acquisition module, a signal processing module, and an alarm execution module, wherein: The signal generating device is used to generate periodic physical signals; The input terminal of the signal acquisition module is connected to the DP network to acquire the physical signal through the DP network and obtain the signal state of the physical signal; The signal processing module is connected to the output terminal of the signal acquisition module; the signal processing module is used to receive the signal status and generate a fault judgment signal based on the signal status; The alarm execution module is connected to the signal processing module; the alarm execution module is used to receive the fault judgment signal and execute alarm or equipment interlocking actions based on the fault judgment signal.

2. The continuity detection device for DP networks according to claim 1, characterized in that, The signal states include a first signal state and a second signal state, wherein: The input terminal of the signal acquisition module is connected to the first network segment and the second network segment of the DP network, respectively, so as to obtain the first signal state of the physical signal through the first network segment and the second signal state of the physical signal through the second network segment.

3. The continuity detection device for DP networks according to claim 2, characterized in that, The signal processing module is also used for: Receive the first signal state and the second signal state; Compare whether the first signal state and the second signal state are consistent; If the first signal state is inconsistent with the second signal state, then the fault judgment signal is generated.

4. The continuity detection device for DP networks according to claim 3, characterized in that, The signal processing module is also used for: After taking the first signal state as positive and the second signal state as negative, a series logic judgment is performed. If the series circuit is connected, it is determined that the first signal state and the second signal state are inconsistent.

5. The continuity detection device for DP networks according to claim 1, characterized in that, The signal generating device includes: Electric motor; A stop is fixedly installed on the rotating shaft of the motor; A proximity switch, wherein the sensing surface of the proximity switch is disposed opposite to the rotation trajectory of the stop; the proximity switch is used to generate a physical signal in the form of a pulse when the stop rotates closer.

6. The continuity detection device for DP networks according to claim 5, characterized in that, It also includes a base bracket; the motor and the proximity switch are fixedly mounted via the base bracket.

7. The continuity detection device for DP networks according to claim 5, characterized in that, The motor is a 24V adjustable speed motor, and the motor speed is configured to rotate once every 6 seconds.

8. The continuity detection device for DP networks according to claim 1, characterized in that, The alarm execution module includes a human-machine interface alarm unit, which is used to display text alarm information containing the location of the faulty network segment on the operation interface when the fault judgment signal is received.

9. The continuity detection device for DP networks according to claim 1, characterized in that, The alarm execution module also includes a device interlocking control unit, which is used to stop the operation of the devices connected to the DP network when the fault judgment signal is received.

10. The continuity detection device for DP networks according to claim 2, characterized in that, The signal processing module is further configured to start timing after generating the fault judgment signal; if the first signal state and the second signal state return to consistency within a preset time, the fault judgment signal is automatically cancelled; if the first signal state and the second signal state are still inconsistent after the preset time, the fault judgment signal is maintained and the alarm execution module is triggered.

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