CAN (Controller Area Network) relay device for transmitting data issued by host end to terminal

Abstract

The utility model relates to the field of automation, in particular to a CAN (Controller Area Network) relay device for transmitting data issued by a host end to a terminal. According to the utility model, through the CAN communication processing unit, received CAN data are identified, and the identified data are distributed to different CAN links. The device can play a relay role in long-distance CAN communication, can also be suitable for a one-master multi-slave working scene, can effectively reduce the number of CAN communication devices, and reduces the cost.

Description

Technical Field

[0001] This utility model relates to the field of automation, and in particular to a CAN relay device that transmits data from the host to the terminal. Background Technology

[0002] With the development of the electronics and information industry, electronic devices suitable for different working environments are emerging in an endless stream. CAN communication is widely used in industrial automation, shipbuilding, medical, and industrial equipment. In the fields of shipbuilding and industrial control, the distance between CAN communication devices is long, and the operating environment is complex. Therefore, it is necessary to add relay modules between communicating devices to increase anti-interference capabilities.

[0003] With the booming development of the electronics and information industry, a large number of electronic devices adapted to different working conditions have emerged in various industries. Among them, CAN communication technology is widely used, such as in industrial automated production lines, ship equipment integration, medical instrument networking, and collaborative operation of various industrial equipment. However, in ship navigation and complex industrial manufacturing environments, the distance between devices is often large and there are many interference factors, resulting in prominent signal attenuation and interference problems. Although traditional repeater modules can extend the communication distance to a certain extent, their functions are limited and cannot meet the stringent requirements for accurate data transmission and efficient utilization under complex working conditions. To enhance communication reliability, improve transmission efficiency, and reduce system energy consumption and maintenance costs, the development of a new type of CAN repeater device with link extension capabilities is of great significance. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a CAN relay device that distributes data from the host to terminals. The CAN relay device architecture of this invention includes a CAN communication processing unit, a host interface, and multiple terminal link interfaces. The host acts as the core data transmission and reception hub, uniformly managing global data interaction; the terminal interfaces construct diverse branch links, radiating to various terminal devices, establishing a flexible and efficient data distribution structure.

[0005] The technical solution of this utility model is: a CAN relay device for transmitting data from a host to a terminal, comprising a host, a primary distribution CAN, a secondary distribution CAN, and a terminal. The host is connected to multiple primary distribution CANs. The host is characterized by connecting to the primary distribution CANs via signal output lines CANL0 and CANH0. The CANL0 and CANH0 signals are respectively connected to the input terminal of a common-mode inductor T via a first resistor and a second resistor. The output terminal of the common-mode inductor T is connected to the primary distribution CAN. The signal output line CANL0 is connected to ground via a first bidirectional Zener diode D1, and the signal output line CANH is connected to ground via a second bidirectional Zener diode D2. The primary distribution CAN is an isolated transceiver. The isolated transceiver connects to multiple secondary distribution CANs, and each secondary distribution CAN is connected to a terminal.

[0006] According to the CAN relay device for transmitting data from the host to the terminal as described above, the feature is that: the host is connected to 4 primary distribution CANs, and each primary distribution CAN is connected to 4 secondary distribution CANs.

[0007] According to the CAN relay device for transmitting data from the host to the terminal as described above, the common mode inductor T is an SDCW3216 inductor.

[0008] According to the CAN relay device for transmitting data from the host to the terminal as described above, the first bidirectional Zener diode D1 is a W05Z0B or RCIAMP0521P diode.

[0009] According to the CAN relay device for transmitting data from the host to the terminal as described above, the second bidirectional Zener diode D2 is a W05Z0B or RCIAMP0521P diode.

[0010] The beneficial effects of this invention are as follows: The device optimizes network performance, ensuring that critical commands reach the target terminal with zero latency, thus improving the efficiency of system collaborative operations. This has profound significance in industrial real-time control scenarios. This invention also enables the efficient expansion of the CAN communication port into multiple independent output links, laying a solid foundation for building complex distributed control systems, enhancing the flexibility and scalability of the system architecture, and reducing network construction costs. Attached Figure Description

[0011] Figure 1 This is a functional block diagram of a CAN relay device.

[0012] Figure 2 This is a schematic diagram of the hardware principle of a CAN relay device. Detailed Implementation

[0013] The technical solution of this utility model will be further described below with reference to the accompanying drawings.

[0014] like Figure 1 and Figure 2 As shown, this utility model discloses a CAN relay device for transmitting data from a host to a terminal. It includes a host, a primary distribution CAN, a secondary distribution CAN, and terminals. The primary and secondary distribution CANs constitute the relay device. The host is connected to multiple primary distribution CANs, each primary distribution CAN is connected to multiple secondary distribution CANs, and each secondary distribution CAN corresponds to one terminal. Figure 1In this configuration, the host connects to two primary distribution CANs, each primary distribution CAN connects to two secondary distribution CANs, and each secondary distribution CAN connects to one terminal. In actual designs, multiple secondary distribution CANs can be configured as required. For example, the host can connect to four primary distribution CANs, each primary distribution CAN connects to four secondary distribution CANs, resulting in a total of 16 secondary distribution CANs, which can correspond to 16 terminals and satisfy data distribution needs of multiple systems.

[0015] like Figure 2 As shown, the host end of this invention connects to the primary distribution CAN via signal output lines CANL0 and CANH0. CANL0 and CANH0 signals are connected to the input terminal of common-mode inductor T via first resistor R1 and second resistor R2, respectively. The output terminal of common-mode inductor T is connected to the primary distribution CAN (U1). This common-mode inductor connection prevents damage to the communication interface from high current and voltage, providing protection for the internal circuitry. The common-mode inductor T in this invention can be an SDCW3216 inductor. The signal output line CANL0 is connected to ground via a first bidirectional Zener diode D1, and the signal output line CANH is connected to ground via a second bidirectional Zener diode D2. The common-mode inductor T and the bidirectional Zener diodes work together to eliminate interference signals on the line, filtering the transmitted signal. They also provide breakdown discharge when the device is affected by static electricity or lightning, preventing damage to the CAN transceiver. The primary distribution CAN (U1) in this invention is an isolated transceiver (CTD331SCANH). The isolated transceiver (CTD331SCANH) connects multiple secondary CAN distribution transceivers. Because this invention uses a multi-level CAN connection, common-mode inductors and bidirectional Zener diodes are installed at each level to ensure uninterrupted signal transmission between levels. This allows for multi-level expansion, with each level capable of having 2 to 10 transceivers connected in parallel.

[0016] The first bidirectional Zener diode D1 and the second bidirectional Zener diode D2 of this utility model can be diodes of models such as W05Z0B and RCIAMP0521P.

[0017] For example, in actual operation, the device of this invention can quickly determine the specific terminal link to which the data such as temperature, pressure, and flow collected from different sensors on the production line should be sent, based on the feedback requirements of the control unit corresponding to the equipment area. This ensures that the data is accurately transmitted along the optimal path in the vast industrial network, realizing the efficient and orderly operation of the entire system and providing a solid and reliable data transmission guarantee for key links such as precise control and fault early warning in the industrial automation production process.

[0018] This invention encompasses a CAN communication processing unit, a host interface, and multiple terminal link interfaces. The host, as the core hub of the entire data transmission system, bears the crucial responsibility of being the main CAN data transceiver port, uniformly managing data interactions from various sources and in various directions. The host can receive instructions and data from the upper-level control system or other data sources in real time and stably, while simultaneously sending processed or forwarded data to the corresponding terminal links. The terminal interfaces construct a multi-branch link network, widely radiating to various terminal devices, forming a network architecture with the host as the core and each terminal device as a node. This architecture lays a solid foundation for efficient data distribution, enabling data to quickly reach each target terminal from the central node (host) along multiple independent paths, avoiding data transmission congestion and chaos, and ensuring that each terminal device can receive data information closely related to its own task in the shortest possible time, thus providing strong support for the stable operation and efficient collaboration of the entire system.

[0019] The host side of this utility model relies on preset protocol rules, and first-level CAN distribution and second-level CAN distribution analyze the downlink data frame identifier, key content features and target terminal attribute mapping relationship of the host side; filter condition matching and link allocation decision, accurately sort data according to the analysis results, drive it to be transmitted in a directional manner along the adapted terminal link, ensure accurate data delivery, and avoid link congestion and resource loss caused by invalid transmission.

Claims

1. A CAN relay device for transmitting data from a host to a terminal, comprising a host, a primary distribution CAN, a secondary distribution CAN, and a terminal, wherein the host is connected to multiple primary distribution CANs, characterized in that: The host unit connects to the primary distribution CAN via signal output lines CANL0 and CANH0. The CANL0 and CANH0 signals are connected to the input terminal of the common-mode inductor T via the first resistor and the second resistor, respectively. The output terminal of the common-mode inductor T is connected to the primary distribution CAN. The signal output line CANL0 is connected to the power supply ground via the first bidirectional Zener diode D1, and the signal output line CANH is connected to the power supply ground via the second bidirectional Zener diode D2. The primary distribution CAN is an isolated transceiver. The isolated transceiver connects to multiple secondary distribution CANs, and each secondary distribution CAN is connected to a terminal.

2. The CAN relay device for transmitting data from the host to the terminal according to claim 1, characterized in that: The host connects to four primary distribution CANs, and each primary distribution CAN connects to four secondary distribution CANs.

3. A CAN relay device for transmitting data from the host to the terminal according to claim 1 or 2, characterized in that: The common-mode inductor T is an SDCW3216 inductor.

4. A CAN relay device for transmitting data from the host to the terminal according to claim 1 or 2, characterized in that: The first bidirectional Zener diode D1 is either a W05Z0B or an RCIAMP0521P diode.

5. A CAN relay device for transmitting data from the host to the terminal according to claim 1 or 2, characterized in that: The second bidirectional Zener diode D2 is either a W05Z0B or an RCIAMP0521P diode.

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