EtherCAT master station communication control circuit and distributed IO module
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHENZHEN SANMING ELECTRIC CO LTD
- Filing Date
- 2025-04-14
- Publication Date
- 2026-04-17
AI Technical Summary
[0004]现有的EtherCAT主站模块通常仅支持标准以太网接口，缺乏CAN总线、USB等多样化通信接口，扩展性差，难以适配不同工业场景下的设备互联需求
Smart Images
Figure CN224139019U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of fieldbus control technology, and in particular to an EtherCAT master station communication control circuit and a distributed I / O module. Background Technology
[0002] A distributed I / O module is a remote data acquisition and control device based on industrial bus technology. The distributed I / O module features a distributed architecture, including master and slave devices. The slave devices are connected to the master device via a high-speed industrial bus (such as EtherCAT or PROFINET), and are physically distributed across the industrial field to achieve local signal acquisition and actuator control.
[0003] The distributed I / O module features a modular design, supporting flexible combinations of digital input / output (DI / DO), analog input / output (AI / AO), and dedicated functions (such as PWM and encoder interfaces). Utilizing real-time Ethernet protocols like EtherCAT, it achieves microsecond-level synchronous response, meeting the low-latency requirements of motion control, PLC, and other scenarios. Typical applications of the distributed I / O module include, but are not limited to, industrial robot joint control, sensor networks in smart manufacturing production lines, and remote monitoring of power systems.
[0004] Existing EtherCAT master modules typically only support standard Ethernet interfaces, lacking diverse communication interfaces such as CAN bus and USB, resulting in poor scalability and difficulty in adapting to the interconnection needs of devices in different industrial scenarios. Furthermore, in industrial environments, EtherCAT communication is susceptible to electromagnetic interference (EMI), and insufficient isolation performance can lead to signal distortion or communication interruptions, affecting the reliability of data transmission from the distributed I / O module. Therefore, inventing a reliable EtherCAT master communication control circuit and distributed I / O module is a problem urgently needing to be solved by those skilled in the art. Utility Model Content
[0005] The purpose of this application is to provide an EtherCAT master station communication control circuit and a distributed I / O module. This solution can realize the expansion of EtherCAT slave devices and CAN communication devices, with strong compatibility. At the same time, it can also realize reliable data transmission between the distributed I / O module master station and PLC, and the distributed I / O module slave station, effectively preventing surge / EMI interference.
[0006] To solve the above-mentioned technical problems, this application provides an EtherCAT master station communication control circuit, including a power supply module, a main control module, an EtherCAT master station control module, a first network port pulse transformer module, a second network port pulse transformer module, a CAN communication control module, and a USB interface module.
[0007] The power module is electrically connected to the main control module, the EtherCAT master station control module, the first network port pulse transformer module, the second network port pulse transformer module, the CAN communication control module, and the USB interface module, respectively.
[0008] The PLC is electrically connected to the first network port pulse transformer module, the first network port pulse transformer module is electrically connected to the EtherCAT master station control module, the EtherCAT master station control module is electrically connected to the second network port pulse transformer module, and the second network port pulse transformer module is electrically connected to the EtherCAT slave station; the master control module is electrically connected to the EtherCAT master station control module, the CAN communication control module is electrically connected to the master control module, and the USB interface module is electrically connected to the master control module.
[0009] Preferably, the CAN communication control module includes a digital isolation unit, a CAN transceiver unit, and a signal processing unit;
[0010] The power module is electrically connected to the digital isolation unit, the CAN transceiver unit, and the signal processing unit, respectively.
[0011] The digital isolation unit is electrically connected to the main control module, the CAN transceiver unit is electrically connected to the digital isolation unit, and the signal processing unit is electrically connected to both the CAN transceiver unit and the distributed I / O module slave station.
[0012] Preferably, the signal processing unit includes a common-mode choke coil unit, a terminating resistor subunit, a TVS protection subunit, and a power supply protection subunit;
[0013] The common-mode choke coil unit is electrically connected to the CAN transceiver unit, the terminating resistor subunit is electrically connected to the common-mode choke coil unit, the TVS protection subunit is electrically connected to the terminating resistor subunit, and the power protection subunit is electrically connected to both the TVS protection subunit and the distributed I / O module slave station.
[0014] Preferably, the terminal resistor subunit includes a first resistor and a second resistor;
[0015] The first end of the first resistor is electrically connected to the common-mode choke coil unit and the TVS protection subunit, respectively, and the second end of the first resistor is grounded;
[0016] The first end of the second resistor is electrically connected to the common-mode choke coil unit and the TVS protection subunit, respectively, and the second end of the second resistor is grounded.
[0017] Preferably, the first network port pulse transformer module includes a first network port pulse transformer unit, a first bidirectional ESD protection unit, and a first network interface connection unit;
[0018] The first network interface connection unit is electrically connected to the PLC, the first bidirectional ESD protection unit is electrically connected to the first network interface connection unit and the first network port pulse transformer unit, and the first network port pulse transformer unit is electrically connected to the EtherCAT master station control module.
[0019] Preferably, the second network port pulse transformer module includes a second network port pulse transformer unit, a second bidirectional ESD protection unit, and a second network interface connection unit;
[0020] The second network interface connection unit is electrically connected to the EtherCAT master station control module, the second bidirectional ESD protection unit is electrically connected to the second network interface connection unit and the second network port pulse transformer unit, and the second network port pulse transformer unit is electrically connected to the EtherCAT slave station.
[0021] Preferably, the main control module includes a main control unit and a switch switching unit;
[0022] The power module is electrically connected to both the main control unit and the switch switching unit, and the switch switching unit is electrically connected to the main control unit.
[0023] Preferably, the USB interface module includes a USB interface unit and a USB electrostatic discharge protection unit;
[0024] The USB interface unit is electrically connected to the main control module, and the USB electrostatic discharge protection unit is electrically connected to the USB interface unit.
[0025] Preferably, the main control unit is configured as an MCU.
[0026] To address the aforementioned technical problems, this application provides a distributed I / O module, including the aforementioned EtherCAT master station communication control circuit.
[0027] This utility model discloses an EtherCAT master station communication control circuit and distributed I / O module, which has the following advantages: It includes a power supply module, a main control module, an EtherCAT master station control module, a first network port pulse transformer module, a second network port pulse transformer module, a CAN communication control module, and a USB interface module. The main control module runs the EtherCAT master station protocol stack and coordinates communication between modules. The EtherCAT master station control module parses the EtherCAT protocol and manages master-slave data exchange. The first network port pulse transformer module connects to a PLC and is used to isolate and convert Ethernet signals. The second network port pulse transformer module connects to EtherCAT slaves and is used to convert the differential signals output by the EtherCAT master station control module into isolated Ethernet signals, connecting multiple EtherCAT slaves through a topology. The CAN communication control module supports CAN communication device access and converts the TTL signals of the main control module into CAN differential signals through a CAN transceiver. The USB interface module provides a debugging or configuration interface. Therefore, this invention can expand EtherCAT slave devices and CAN communication devices, with strong compatibility; at the same time, it can also realize reliable data transmission between the distributed IO module master station and PLC, and the distributed IO module slave station, effectively preventing surge / EMI interference. Attached Figure Description
[0028] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the utility model will be further described below in conjunction with the accompanying drawings and embodiments. The drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0029] Figure 1 This is a schematic diagram of the structure of an EtherCAT master station communication control circuit according to a preferred embodiment of the present invention.
[0030] Figure 2 This is a schematic diagram of the structure of a distributed I / O module according to a preferred embodiment of the present invention.
[0031] Figure 3 This is a schematic diagram of the structure of a CAN communication control module according to a preferred embodiment of the present invention.
[0032] Figure 4 This is a circuit diagram of a CAN communication control module according to a preferred embodiment of the present invention.
[0033] Figure 5 This is a schematic diagram of the structure of a signal processing unit according to a preferred embodiment of the present invention.
[0034] Figure 6This is a circuit diagram of a signal processing unit according to a preferred embodiment of the present invention.
[0035] Figure 7 This is a schematic diagram of the structure of the first network port pulse transformer module of a preferred embodiment of the present invention.
[0036] Figure 8 This is a circuit diagram of the first network port pulse transformer module of a preferred embodiment of the present invention.
[0037] Figure 9 This is a circuit diagram of a switch switching unit according to a preferred embodiment of the present invention.
[0038] Figure 10 This is a circuit diagram of a USB interface module according to a preferred embodiment of the present invention. Detailed Implementation
[0039] The core of this application is to provide an EtherCAT master station communication control circuit and a distributed I / O module. This solution can realize the expansion of EtherCAT slave devices and CAN communication devices, with strong compatibility. At the same time, it can also realize reliable data transmission between the distributed I / O module master station and PLC, and the distributed I / O module slave station, effectively preventing surge / EMI interference.
[0040] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0041] Please see Figure 1 , Figure 1 The schematic diagram of an EtherCAT master station communication control circuit provided in this application includes a power supply module 1, a main control module 2, an EtherCAT master station control module 3, a first network port pulse transformer module 4, a second network port pulse transformer module 5, a CAN communication control module 6, and a USB interface module 7.
[0042] Power module 1 is electrically connected to main control module 2, EtherCAT master station control module 3, first network port pulse transformer module 4, second network port pulse transformer module 5, CAN communication control module 6, and USB interface module 7, respectively; PLC is electrically connected to first network port pulse transformer module 4, first network port pulse transformer module 4 is electrically connected to EtherCAT master station control module 3, EtherCAT master station control module 3 is electrically connected to second network port pulse transformer module 5, second network port pulse transformer module 5 is electrically connected to EtherCAT slave station; main control module 2 is electrically connected to EtherCAT slave station control module, CAN communication control module 6 is electrically connected to main control module 2, and USB interface module 7 is electrically connected to main control module 2.
[0043] Specifically, in this embodiment, the power supply module 1 is used to provide a stable rated voltage output for each functional module; the main control module 1 is used to run the EtherCAT master station protocol stack and coordinate the communication of each module; the EtherCAT master station control module 3 is used to parse the EtherCAT protocol and manage the data exchange between the master and slave stations; the first network port pulse transformer module 4 is connected to the PLC and is used to isolate and convert Ethernet signals; the second network port pulse transformer module 5 is connected to the EtherCAT slave station and is used to convert the differential signal output by the EtherCAT master station control module into an isolated Ethernet signal, and connect multiple EtherCAT slave stations through topology; the CAN communication control module 6 is used to support the access of CAN communication devices and convert the TTL signal of the main control module 2 into a CAN differential signal through a CAN transceiver; and the USB interface module 7 is used to provide a debugging or configuration interface.
[0044] Please see Figure 2 , Figure 2 This is a schematic diagram of the structure of a distributed I / O module provided in this application.
[0045] Specifically, in this embodiment, the power supply module 1, main control module 2, EtherCAT master station control module 3, first network port pulse transformer module 4, second network port pulse transformer module 5, CAN communication control module 6, and USB interface module 7 adopt a highly integrated design and are jointly packaged to form a complete EtherCAT master station. The EtherCAT master station has the ability to interact with various slave devices configured with the EtherCAT communication protocol, and its compatibility is not limited by specific brands, so it can be widely used in the field of industrial automation control.
[0046] In particular, the EtherCAT master station, through its integrated CAN communication control module 6, can establish stable communication connections with multiple distributed I / O module slave stations, forming a hybrid network topology among the EtherCAT master station, EtherCAT slave stations, and distributed I / O module slave stations. By extending the connection of more distributed I / O devices through the CAN bus, the system's scalability and adaptability are improved, meeting the diverse communication needs in complex industrial scenarios.
[0047] Specifically, the EtherCAT master control module 3 receives PLC data (such as control commands) from the first network port pulse transformer module 4, encapsulates it into an EtherCAT frame, broadcasts the data to the EtherCAT slave through the second network port pulse transformer module 5, and collects the slave's response data.
[0048] Specifically, the first network port pulse transformer module 4 receives PLC data, which is then isolated by the pulse transformer of the first network port pulse transformer module 4 and converted into a differential signal before being transmitted to the EtherCAT master station control module.
[0049] In summary, this application provides an EtherCAT master station communication control circuit, which includes a power supply module 1, a main control module 2, an EtherCAT master station control module 3, a first network port pulse transformer module 4, a second network port pulse transformer module 5, a CAN communication control module 6, and a USB interface module 7. The power supply module 1 is electrically connected to the main control module 2, the EtherCAT master station control module 3, the first network port pulse transformer module 4, the second network port pulse transformer module 5, the CAN communication control module 6, and the USB interface module 7. The PLC is electrically connected to the first network port pulse transformer module 4, the first network port pulse transformer module 4 is electrically connected to the EtherCAT master station control module 3, the EtherCAT master station control module 3 is electrically connected to the second network port pulse transformer module 5, and the second network port pulse transformer module 5 is electrically connected to the EtherCAT slave station. The main control module 2 is electrically connected to the EtherCAT slave station control module, the CAN communication control module 6 is electrically connected to the main control module 2, and the USB interface module 7 is electrically connected to the main control module 2. Therefore, this invention can expand EtherCAT slave devices and CAN communication devices, with strong compatibility; at the same time, it can also realize reliable data transmission between the distributed IO module master station and PLC, and the distributed IO module slave station, effectively preventing surge / EMI interference.
[0050] Based on the above embodiments:
[0051] Please refer to Figure 3 , Figure 3 This is a schematic diagram of the structure of a CAN communication control module provided in this application.
[0052] Please refer to Figure 4 , Figure 4 The circuit schematic diagram of a CAN communication control module provided in this application.
[0053] In a preferred embodiment, the CAN communication control module 6 includes a digital isolation unit 61, a CAN transceiver unit 62, and a signal processing unit 63;
[0054] The power module 1 is electrically connected to the digital isolation unit 61, the CAN transceiver unit 62, and the signal processing unit 63, respectively.
[0055] Digital isolation unit 61 is electrically connected to main control module 2, CAN transceiver unit 62 is electrically connected to digital isolation unit 61, and signal processing unit 63 is electrically connected to CAN transceiver unit 62 and distributed IO module slave station respectively.
[0056] Specifically, in this embodiment, the digital isolation unit 61 is used to achieve electrical isolation between the main control module 2 and the CAN bus, preventing ground loop interference and common-mode noise from affecting system stability; the CAN transceiver unit 62 is used to convert digital signals into CAN bus differential signals (CANH / CANL) and realize bus driving and protection; the signal processing unit 63 is used to optimize CAN signal quality and adapt to the electrical characteristics of the distributed IO module slave station.
[0057] Please refer to Figure 5 , Figure 5 This is a schematic diagram of the structure of a signal processing unit provided in this application.
[0058] Please refer to Figure 6 , Figure 6 The circuit schematic diagram of a signal processing unit provided in this application.
[0059] In a preferred embodiment, the signal processing unit 63 includes a common-mode choke coil unit 631, a terminating resistor subunit 632, a TVS protection subunit 633, and a power protection subunit 634.
[0060] The common-mode choke coil unit 631 is electrically connected to the CAN transceiver unit 62, the terminating resistor subunit 632 is electrically connected to the common-mode choke coil unit 631, the TVS protection subunit 633 is electrically connected to the terminating resistor subunit 632, and the power protection subunit 634 is electrically connected to the TVS protection subunit 633 and the distributed IO module slave station, respectively.
[0061] In a preferred embodiment, the terminating resistor subunit 632 includes a first resistor and a second resistor;
[0062] The first end of the first resistor is electrically connected to the common-mode choke coil unit 631 and the TVS protection subunit 633 respectively, and the second end of the first resistor is grounded.
[0063] The first end of the second resistor is electrically connected to the common-mode choke coil unit 631 and the TVS protection subunit 633, respectively, and the second end of the second resistor is grounded.
[0064] Specifically, in this embodiment, the common-mode choke coil unit 631 is used to suppress common-mode noise (such as electromagnetic interference EMI) on the CAN bus. The common-mode choke coil is composed of symmetrically wound inductor coils, which present high impedance to common-mode signals to prevent them from passing through; and present low impedance to differential signals (the effective data of CANH / CANL) to ensure lossless signal transmission.
[0065] Specifically, the terminating resistor subunit 632 is used to match the bus impedance and prevent signal reflection. The first resistor R1 and the second resistor R2 are both 120Ω, and their equivalent resistance after being connected in parallel is 60Ω. The two resistors are connected across CANH and CANL to absorb signal energy and eliminate reflection at the end of the transmission line.
[0066] Specifically, the TVS protection subunit 633 is used to suppress transient voltages, and the power supply protection subunit 634 is used to prevent abnormal power supply from damaging the connected distributed I / O modules.
[0067] Please refer to Figure 7 , Figure 7 This is a schematic diagram of the structure of a first network port pulse transformer module provided in this application.
[0068] Please refer to Figure 8 , Figure 8 The circuit diagram of a first network port pulse transformer module provided in this application.
[0069] In a preferred embodiment, the first network port pulse transformer module 4 includes a first network port pulse transformer unit 41, a first bidirectional ESD protection unit 42, and a first network interface connection unit 43;
[0070] The first network interface connection unit 43 is electrically connected to the PLC, the first bidirectional ESD protection unit 42 is electrically connected to the first network interface connection unit 43 and the first network port pulse transformer unit 41 respectively, and the first network port pulse transformer unit 41 is electrically connected to the EtherCAT master station control module 3.
[0071] In a preferred embodiment, the second network port pulse transformer module 5 includes a second network port pulse transformer unit 51, a second bidirectional ESD protection unit 52, and a second network interface connection unit 53;
[0072] The second network interface connection unit 53 is electrically connected to the EtherCAT master station control module 3. The second bidirectional ESD protection unit 52 is electrically connected to the second network interface connection unit 53 and the second network port pulse transformer unit 51 respectively. The second network port pulse transformer unit 51 is electrically connected to the EtherCAT slave station.
[0073] Specifically, in this embodiment, the first network interface connection unit 43 provides a standard RJ45 physical interface for electrical connection with the PLC; the first bidirectional ESD protection unit 42 provides bidirectional electrostatic discharge (ESD) protection; and the first network port pulse transformer unit 41 achieves signal isolation and impedance matching by using a gigabit Ethernet pulse transformer with a 1:1 turns ratio. It is understood that in this embodiment, the working principle of the second network port pulse transformer module 5 is the same as that of the first network port pulse transformer module 4, and will not be described again here.
[0074] Please refer to Figure 9 , Figure 9 The circuit diagram of a switch switching unit provided in this application.
[0075] In a preferred embodiment, the main control module 2 includes a main control unit 21 and a switch switching unit 22;
[0076] The power module 1 is electrically connected to the main control unit 21 and the switch switching unit 22 respectively, and the switch switching unit 22 is electrically connected to the main control unit 21.
[0077] Specifically, in this embodiment, the switch switching unit 22 is implemented by a piano key switch. The piano key switch is used to switch the working mode of the EtherCAT master station. The working mode includes two types: USB burning mode and normal working mode, which are not specifically limited here.
[0078] Please refer to Figure 10 , Figure 10 The circuit schematic diagram of a USB interface module provided in this application.
[0079] In a preferred embodiment, the USB interface module 7 includes a USB interface unit 71 and a USB electrostatic discharge protection unit 72;
[0080] The USB interface unit 71 is electrically connected to the main control module 2, and the USB electrostatic protection unit 72 is electrically connected to the USB interface unit 71.
[0081] Specifically, in this embodiment, the USB interface unit 71 is used to connect the program burning device, enabling plug-and-play functionality, and the USB electrostatic discharge protection unit 72 is used to suppress electrostatic discharge and prevent electrical overload.
[0082] In a preferred embodiment, the main control unit 21 is configured as an MCU. In another embodiment, the model and type of the main control unit 21 are not specifically limited.
[0083] This application also provides a distributed I / O module, including an EtherCAT master station communication control circuit.
[0084] For a description of the EtherCAT master communication control circuit in a distributed IO module provided in this application, please refer to the above embodiments; further details will not be repeated here.
[0085] It should be noted that, in this specification, 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. Unless otherwise specified, 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 that element.
[0086] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. An EtherCAT master communication control circuit, characterized by comprising: It includes a power supply module, a main control module, an EtherCAT master station control module, a first network port pulse transformer module, a second network port pulse transformer module, a CAN communication control module, and a USB interface module; The power module is electrically connected to the main control module, the EtherCAT master station control module, the first network port pulse transformer module, the second network port pulse transformer module, the CAN communication control module, and the USB interface module, respectively. The PLC is electrically connected to the first network port pulse transformer module, the first network port pulse transformer module is electrically connected to the EtherCAT master station control module, the EtherCAT master station control module is electrically connected to the second network port pulse transformer module, and the second network port pulse transformer module is electrically connected to the EtherCAT slave station; the master control module is electrically connected to the EtherCAT master station control module, the CAN communication control module is electrically connected to the master control module, and the USB interface module is electrically connected to the master control module.
2. The EtherCAT master communication control circuit according to claim 1, characterized in that, The CAN communication control module includes a digital isolation unit, a CAN transceiver unit, and a signal processing unit. The power module is electrically connected to the digital isolation unit, the CAN transceiver unit, and the signal processing unit, respectively. The digital isolation unit is electrically connected to the main control module, the CAN transceiver unit is electrically connected to the digital isolation unit, and the signal processing unit is electrically connected to both the CAN transceiver unit and the distributed I / O module slave station.
3. The EtherCAT master communication control circuit according to claim 2, characterized in that, The signal processing unit includes a common-mode choke coil unit, a terminating resistor subunit, a TVS protection subunit, and a power supply protection subunit. The common-mode choke coil unit is electrically connected to the CAN transceiver unit, the terminating resistor subunit is electrically connected to the common-mode choke coil unit, the TVS protection subunit is electrically connected to the terminating resistor subunit, and the power protection subunit is electrically connected to both the TVS protection subunit and the distributed I / O module slave station.
4. The EtherCAT master communication control circuit according to claim 3, characterized in that, The terminal resistor subunit includes a first resistor and a second resistor; The first end of the first resistor is electrically connected to the common-mode choke coil unit and the TVS protection subunit, respectively, and the second end of the first resistor is grounded; The first end of the second resistor is electrically connected to the common-mode choke coil unit and the TVS protection subunit, respectively, and the second end of the second resistor is grounded.
5. The EtherCAT master station communication control circuit according to claim 1, characterized in that, The first network port pulse transformer module includes a first network port pulse transformer unit, a first bidirectional ESD protection unit, and a first network interface connection unit; The first network interface connection unit is electrically connected to the PLC, the first bidirectional ESD protection unit is electrically connected to the first network interface connection unit and the first network port pulse transformer unit, and the first network port pulse transformer unit is electrically connected to the EtherCAT master station control module.
6. The EtherCAT master communication control circuit according to claim 1, characterized in that, The second network port pulse transformer module includes a second network port pulse transformer unit, a second bidirectional ESD protection unit, and a second network interface connection unit; The second network interface connection unit is electrically connected to the EtherCAT master station control module, the second bidirectional ESD protection unit is electrically connected to the second network interface connection unit and the second network port pulse transformer unit, and the second network port pulse transformer unit is electrically connected to the EtherCAT slave station.
7. The EtherCAT master communication control circuit according to claim 1, characterized in that, The main control module includes a main control unit and a switch switching unit; The power module is electrically connected to both the main control unit and the switch switching unit, and the switch switching unit is electrically connected to the main control unit.
8. The EtherCAT master communication control circuit according to claim 1, characterized in that, The USB interface module includes a USB interface unit and a USB electrostatic protection unit. The USB interface unit is electrically connected to the main control module, and the USB electrostatic discharge protection unit is electrically connected to the USB interface unit.
9. The EtherCAT master communication control circuit according to claim 7, characterized in that, The main control unit is set as an MCU.
10. A distributed IO module, comprising: Includes an EtherCAT master station communication control circuit as described in any one of claims 1 to 9.