CN108777649B

CN108777649B - Network interception device, system and method

Info

Publication number: CN108777649B
Application number: CN201810573875.9A
Authority: CN
Inventors: 张承瑞; 马学斌; 姬帅
Original assignee: Shandong Ezcode Intelligent Technology Co ltd
Current assignee: Shandong Ezcode Intelligent Technology Co ltd
Priority date: 2018-06-06
Filing date: 2018-06-06
Publication date: 2023-05-30
Anticipated expiration: 2038-06-06
Also published as: CN108777649A

Abstract

The invention discloses a network interception device, a system and a method, which realize data interception of a real-time industrial Ethernet on the basis of not intervening in the original network topology. The first network port and the second network port of the device are directly connected through the PCB wiring, so that network data can directly enter a network through the other network port while being uploaded, delay caused by processing and forwarding is avoided, and the requirement of small-period real-time communication is met. The device uses FPGA as a core device, adds a serial number and a time stamp to a network data frame, then sends the network data frame to a monitoring computer, simultaneously analyzes the data frame in a CPU soft core, acquires required state information, and uploads the state information to a server through an NB-IOT module. The hardware connection method is convenient and reliable, the cost is low, and a user can write a data frame analysis method according to the type of the network to be tested, so as to acquire the concerned state information. Has wide use value and application prospect in the field of industrial Ethernet.

Description

Network interception device, system and method

Technical Field

The invention relates to a network interception device, a system and a method.

Background

Real-time industrial ethernet technology is an extension and development of ethernet technology in the field of automation control, and is an important development direction in the field of industrial control automation. The interception of network data frames is an effective means for researching the communication performance and state of the network, whether in the networking development and debugging stage of the real-time Ethernet or the normal operation stage of the whole network equipment.

However, as the numerical control processing is developed towards high speed and high precision, the communication period of the real-time ethernet is shorter and shorter, and the traditional mode of forwarding the data frame by transmitting the data frame into the microprocessor tends to cause delay of network transmission, so that the communication quality of the communication network with extremely short communication period is reduced and even normal communication cannot be performed. All real-time Ethernet manufacturers also put forward related network interception devices, but interception aiming at a certain real-time Ethernet, such as Bei Jialai interception devices aiming at POWERLINK and Beifu aiming at EtherCAT, has poor universality, and the test method is closed, is not disclosed externally, and has poor expandability.

On the other hand, existing network listeners typically use wired connections and rarely communicate using wireless technology. Even if the related products use the wireless transmission technology, the problems of short transmission distance, poor signal transmission in a closed environment and high cost are common due to the technical limitation of the traditional wireless network. This greatly limits the range of applications and is not conducive to remote long-term network monitoring.

Disclosure of Invention

In order to solve the defects in the prior art, the invention provides a network interception device, a system and a method;

Introduction of terms: cellular-based narrowband internet of things (Narrow Band Internet of Things, NB-IoT);

PHY refers to the Physical Layer, the lowest Layer of OSI. Generally refers to a chip that interfaces with external signals. The PHY chip, i.e., an ethernet transceiver, is similar to a network card.

In a first aspect of the present invention, a network interception device is provided;

a network listening device comprising:

the FPGA is respectively connected with the first Ethernet interface module, the second Ethernet interface module, the third Ethernet interface module, the communication state indication module, the power supply module, the crystal oscillator circuit and the narrow-band Internet of things module NB-IoT;

the network to be monitored is provided with a first device and a second device which are connected in series, the first Ethernet interface module is connected with the first device, the second Ethernet interface module is connected with the second device, and the first Ethernet interface module is also connected with the second Ethernet interface module;

the first Ethernet interface module receives downlink data transmitted by the first equipment, the downlink data is transmitted to the FPGA through the first Ethernet interface module, and after the FPGA listens for the downlink data, the detected data is transmitted to the cloud server through the narrow-band Internet of things module NB-IoT; the FPGA also transmits downlink data to the monitoring computer through the third Ethernet interface module; the downlink data also sequentially passes through the first Ethernet interface module and the second Ethernet interface module, so that the data is directly transmitted to the second equipment by the first equipment, and the second equipment transmits the downlink data to the network;

The second Ethernet interface module receives uplink data transmitted by the second equipment, the uplink data are sequentially transmitted to the FPGA through the second Ethernet interface module, and after the FPGA listens for the uplink data, the detected data are transmitted to the cloud server through the narrow-band Internet of things module NB-IoT; the FPGA also transmits all uplink data to the monitoring computer through the third Ethernet interface module; the uplink data also sequentially pass through the second Ethernet interface module and the first Ethernet interface module, so that the data is directly transmitted to the first equipment by the second equipment, and the first equipment transmits the uplink data to the network;

the first ethernet interface module includes: the first PHY chip, the first network port transformer and the first RJ45 network port are sequentially connected; the first PHY chip is connected with the FPGA, and the first RJ45 network port is connected with the first device;

the second ethernet interface module includes: the second PHY chip, the second network port transformer and the second RJ45 network port are sequentially connected; the second PHY chip is connected with the FPGA, and the second RJ45 network port is connected with second equipment;

the receiving signal line of the first RJ45 network port is connected with the transmitting signal line of the second RJ45 network port through PCB wiring;

The transmitting signal line of the first RJ45 network port is connected with the receiving signal line of the second RJ45 network port through PCB wiring.

The third ethernet interface module includes: the third PHY chip, the third network port transformer and the third RJ45 network port are sequentially connected; the third PHY chip is connected with the FPGA, and the third RJ45 network port is connected with the monitoring computer.

The narrowband internet of things module NB-IoT wirelessly transmits data heard by the FPGA to the cloud server, and simultaneously receives a remote monitoring command of the cloud server.

Further, the FPGA includes: the device comprises a CPU soft core module, an NB-IOT driving module, an uploading module, a time stamp module, a first data frame encapsulation module, a second data frame encapsulation module, a first port, a second port and a third port;

the CPU soft core module is used for analyzing the data frames encapsulated by the first data frame encapsulation module or the second data frame encapsulation module, extracting the required equipment state information, controlling the NB-IOT driving module to send the data to the narrow-band Internet of things module NB-IOT, and sending the data to the cloud server by the narrow-band Internet of things module NB-IOT. Meanwhile, the CPU soft core module processes instructions remotely controlled by operators through the narrow-band internet of things module NB-IoT to finish corresponding operations.

The NB-IOT driving module is used for realizing the normal operation of the narrow-band Internet of things module NB-IOT by the CPU soft check.

The first port receives the data uploaded by the first Ethernet interface module, encapsulates the uploaded data through the first data frame encapsulation module, then sends the encapsulated data to the third port through the uploading module, and simultaneously uploads the encapsulated data to the CPU soft core for processing, and sends the encapsulated data to the narrow-band Internet of things module NB-IOT by using the NB-IOT driving module, and the narrow-band Internet of things module NB-IOT sends the data to the cloud server;

the second port receives the data uploaded by the second Ethernet interface module, packages the uploaded data through the second data frame packaging module, sends the packaged data to the third port through the uploading module, and simultaneously uploads the packaged data to the CPU soft core for processing, and sends the data to the narrow-band Internet of things module NB-IOT through the NB-IOT module, and the narrow-band Internet of things module NB-IOT sends the data to the cloud server;

further, the first data frame encapsulation module and the second data frame encapsulation module each include: the system comprises an original data frame buffer module and a frame information adding module; wherein, the liquid crystal display device comprises a liquid crystal display device,

the original data frame buffer module buffers the data uploaded by the port, stores the time stamp and the serial number uploaded by the data frame recorded by the time stamp module, and sends the time stamp and the serial number to the frame information adding module;

The frame information adding module is used for adding the time stamp and the serial number information sent by the original data frame buffer module to the back of the original data frame to form a new data frame, and waiting to be respectively sent to the CPU soft core module and the uploading module;

the first data frame encapsulation module and the second data frame encapsulation module are both connected with the time stamp module.

The first data frame encapsulation module is used for forming a new data frame after adding a serial number and a time stamp to the data frame of the first port, transmitting the new data frame to the uploading module, waiting for uploading, and simultaneously transmitting the new data frame to the CPU soft core module, waiting for analysis;

the second data frame encapsulation module is used for forming a new data frame after adding a serial number and a time stamp to the data frame of the second port, transmitting the new data frame to the uploading module, waiting for uploading, and simultaneously transmitting the new data frame to the CPU soft core module, waiting for analysis;

the time stamp module is used for recording the time of uploading the data frames by the first port and the second port, and adding the time of the data frames to the back of the original data frames by the corresponding data frame encapsulation module;

further, the uploading module includes: the first write logic control unit, the second write logic control unit, 8 FIFO units and a transmission control unit; wherein, the liquid crystal display device comprises a liquid crystal display device,

The first writing logic control unit or the second writing logic control unit writes the data sent by the first data packaging module or the second data packaging module into the FIFO memory according to the time sequence, performs writing logic control, and avoids logic difficulty when a plurality of ports simultaneously generate data packet writing requests. In order to prevent errors caused by the fact that the corresponding FIFO is fully occupied due to the fact that the data volume of one port is too large in a period of time, the write-in logic control unit allows the current port to occupy the idle FIFO resources of other ports.

The priority of the first FIFO is set to cope with the situation that a large amount of data arrives in a short time, one port corresponds to four FIFOs, the first FIFO is preferentially used, meanwhile, the priority of the first FIFO is highest, and when all the four FIFOs store data to be transmitted, the data in the first FIFO is transmitted first; thereby ensuring that the monitoring computer can monitor according to the arrival sequence of the data packets.

The sending control unit polls each FIFO buffer memory unit and sends the stored data frame to the monitoring computer through the third Ethernet module interface.

The first write-in logic control unit is used for collecting the data uploaded by the first data frame encapsulation module and then sending the data to the sending control unit through four FIFO units with different sending priorities;

The second writing logic control unit is used for collecting the data uploaded by the second data frame encapsulation module and then sending the data to the sending control unit through the other four FIFO units with different sending priorities;

the transmission control unit transmits the data to the listening computer.

The write logic control is performed, so that the logic difficulty when a plurality of ports simultaneously generate data packet write requests can be avoided. In order to prevent errors caused by the fact that the corresponding FIFO is fully occupied due to the fact that the data volume of one port is too large in a period of time, the write-in logic control unit allows the current port to occupy the idle FIFO resources of other ports.

The priority is set for dealing with the arrival of a large amount of data in a short time, one port corresponds to four FIFOs, the first FIFO is preferentially used, the priority is highest, and when all the four FIFOs store data to be transmitted, the data in the first FIFO is transmitted first. By doing so, the monitoring computer can monitor according to the arrival sequence of the data packets.

The communication state indicating module includes: one or more of a power indicator light, an Ethernet connection status indicator light, an Ethernet communication status indicator light or an NB-IOT narrowband Internet of things communication indicator light.

And the crystal oscillator circuit module provides clock signals for the FPGA.

And the power supply module supplies power to the network interception device.

In a second aspect of the present invention, a network interception system is provided;

a network listening system comprising: the system comprises a network interception device, a cloud server, a interception computer, a first device and a second device of a real-time industrial Ethernet;

the method comprises the steps that data of the real-time industrial Ethernet are transmitted to first equipment, the first equipment uploads the data to a network interception device through a first Ethernet interface module of the network interception device, meanwhile, the data of the first Ethernet interface module are directly transmitted to second equipment through a second Ethernet interface module, the network interception device intercepts the uploaded data, and all the intercepted data are directly transmitted to an interception computer through a third Ethernet interface module; the network interception device analyzes the uploaded data correspondingly according to a preset data frame analysis method corresponding to different types of networks or a data frame analysis method compiled by a user, acquires the needed equipment feedback information, and then uploads the analyzed data to the cloud server.

The data of the first Ethernet interface module is directly transmitted to the second equipment through the second Ethernet interface module, which is equivalent to that the first equipment is directly connected with the second equipment through a network cable, so that the delay caused by the fact that the data is forwarded after being processed to the industrial Ethernet interception is avoided, and the method is also the key point of the real-time industrial Ethernet with extremely short interception period.

In a third aspect of the present invention, a network interception method is provided;

a network interception method, comprising:

step (1): according to the topology type of the network to be intercepted, writing a data frame analysis method of the corresponding network and downloading the data frame analysis method into a network interception device;

step (2): selecting the installation position of a network interception device in the network to be intercepted according to the topology type of the network to be intercepted;

for example:

if the network to be intercepted is an EtherCAT linear topology network, a POWERLINK linear topology network or an EtherMAC linear topology network, connecting a network interception device between a master station and a first slave station of the network to be intercepted; at this time, the master station acts as a first device, and the first slave station acts as a second device;

if the network to be intercepted is an EtherCAT ring topology network, a POWERLINK linear ring network, an EtherMAC ring topology network or an RTEX ring topology network, connecting a network interception device between a last slave station and a master station of the network to be intercepted; at the moment, the last slave station is used as a first device, and the master station is used as a second device;

step (3): when the downlink data is intercepted, the data of the industrial real-time Ethernet is transmitted from the first equipment to a first Ethernet interface module of the network interception device;

Step (4): the first Ethernet interface module of the network interception device directly sends the data transmitted by the first equipment to the second equipment through the second Ethernet interface module, and meanwhile, the data transmitted by the first equipment is uploaded to the FPGA;

step (5): the FPGA processes the received data in two branches, wherein the first branch is used for transmitting the received data to the monitoring computer through the third Ethernet interface unit, the second branch is used for analyzing the received data in the FPGA and transmitting the analyzed required equipment state information to the cloud server through the NB-IOT narrowband Internet of things.

Step (6): when the uplink data is intercepted, the data of the industrial real-time Ethernet is transmitted from the second equipment to a second Ethernet interface module of the network interception device;

step (7): the second Ethernet interface module of the network interception device directly sends the data transmitted by the second equipment to the first equipment through the first Ethernet interface module, and meanwhile, the data transmitted by the second equipment is uploaded to the FPGA;

step (8): the FPGA processes the received data in two branches, wherein the first branch is used for transmitting the received data to the monitoring computer through the third Ethernet interface unit, the second branch is used for analyzing the received data in the FPGA and transmitting the analyzed required equipment state information to the cloud server through the NB-IOT narrowband Internet of things.

And the network interception device is used for passively receiving a remote monitoring instruction, and uploading all the Ethernet data frames which are currently intercepted to the cloud server through the NB-IOT after receiving the remote monitoring instruction.

While the data frame has two paths after passing through the first or second data encapsulation module. One is to enter the uploading module intact and send to the monitoring computer to obtain the complete data frame. The other is to enter a CPU soft core, the CPU soft core analyzes the data frame according to a pre-written analysis method to obtain the required state information, and then the state information is uploaded to a cloud server through an NB-IOT. The beneficial effects of this step are: because NB-IOT is slow and has high delay, a complete data frame is too large for it, so the required state information is sent after the data frame is parsed.

In the interception process of the FPGA:

the first data frame encapsulation module adds a serial number and a time stamp to the data frame of the first port to form a new data frame, and transmits the new data frame to the uploading module to wait for uploading, and simultaneously uploads the new data frame to the CPU soft core to wait for analysis;

the second data frame encapsulation module adds the serial number and the time stamp to the data frame of the second port to form a new data frame, and transmits the new data frame to the uploading module to wait for uploading, and simultaneously uploads the new data frame to the CPU soft core to wait for analysis;

The differential signal RX+ of the first RJ45 network port of the first Ethernet interface module is connected with the differential signal TX+ of the second RJ45 network port of the second Ethernet interface module; the TX+ of the first network port is connected with the RX+ of the second network port.

The differential signal RX of the first RJ45 network port of the first Ethernet interface module is connected with the differential signal TX of the second RJ45 network port of the second Ethernet interface module; the TX of the first network port is connected with the RX of the second network port.

The serial number can be used for distinguishing the sequence of arrival of the data frames, and the time stamp records the specific relative time of arrival of the data frames. Because the industrial real-time ethernet field to which the device is applied has time requirements reaching microsecond levels or even sub microsecond levels, the device is time sensitive.

In a fourth aspect of the present invention, there is provided a listening method for four networks EtherCAT, POWERLINK, etherMAC, RTEX;

step (1): the network interception device pre-stores a network analysis method corresponding to a network to be intercepted; selecting the position of a network interception device in a network according to the type of network topology to be intercepted;

step (2): when the downlink data is intercepted, the data of the industrial real-time Ethernet is transmitted from the first equipment to a first Ethernet interface module of the network interception device;

step (3): the first Ethernet interface module of the network interception device directly sends the data transmitted by the first equipment to the second equipment through the second Ethernet interface module, and meanwhile, the data transmitted by the first equipment is uploaded to the FPGA;

step (4): the FPGA processes the received data in two branches, wherein the first branch is to transmit the received data to a monitoring computer through a third Ethernet interface unit, the second branch is to upload the received data to the FPGA, the FPGA firstly judges the network topology type to which the data frame belongs, then a corresponding pre-stored network analysis method is called from the FPGA to analyze the data frame, and the analyzed required equipment state information is uploaded to a cloud server through an NB-IOT narrowband Internet of things;

Step (5): when the uplink data is intercepted, the data of the industrial real-time Ethernet is transmitted from the second equipment to a second Ethernet interface module of the network interception device;

step (6): the second Ethernet interface module of the network interception device directly sends the data transmitted by the second equipment to the first equipment through the first Ethernet interface module, and meanwhile, the data transmitted by the second equipment is uploaded to the FPGA;

step (7): the FPGA processes the received data in two branches, the first branch is to transmit the received data to the monitoring computer through the third Ethernet interface unit, the second branch is to upload the received data to the FPGA, the FPGA firstly judges the network topology type to which the data frame belongs, then the FPGA invokes a corresponding pre-stored network analysis method to analyze the data frame, and the analyzed required equipment state information is transmitted to the cloud server through the NB-IOT narrowband Internet of things.

As a further improvement of the present invention, the method for retrieving the corresponding pre-stored network data frame from the FPGA analyzes different types of network data frames, and transmits the analyzed required device status information to the cloud server through the NB-IOT narrowband internet of things, which means that:

For the EtherCAT data frame, the slave station directly inserts own state information into the control information issued by the master station, recognizes the state information field of the slave station according to the state word, extracts the state information of the slave station one by one according to the zone bit, and finally uploads the extracted information to the cloud server through the NB-IOT narrowband Internet of things; or alternatively, the process may be performed,

for POWERLINK data frames, firstly identifying a return data frame of each secondary station according to an identification bit, then extracting state data of each secondary station from the return data frame, and finally uploading the extracted information to a cloud server through an NB-IOT (network of things) narrowband; or alternatively, the process may be performed,

for the EtherMAC data frame, firstly, a return data frame is identified, then state information of the slave stations is extracted one by one according to the zone bit, and finally, the extracted information is uploaded to a cloud server through the NB-IOT narrowband Internet of things; or alternatively, the process may be performed,

for RTEX data frames, firstly, a return data frame is identified, then, the running state data of each secondary station is extracted according to the field position, and finally, the extracted information is uploaded to a cloud server through the NB-IOT narrowband Internet of things.

The network interception device also passively receives a remote monitoring instruction, and uploads the complete Ethernet data frame which is currently intercepted to the cloud server through the NB-IOT after receiving the remote monitoring instruction.

While the data frame has two paths after passing through the first or second data encapsulation module. One is to enter the uploading module intact and send to the monitoring computer to obtain the complete data frame. The other is to enter a CPU soft core, the CPU soft core firstly judges the network type of the industrial Ethernet to which the data frame belongs, then analyzes the data frame according to a related protocol, and transmits the analyzed required equipment state information to a cloud server through an NB-IOT narrowband Internet of things. The beneficial effects of this step are: because NB-IOT is slow and has high latency, a complete data frame is too bulky for it, and therefore the required state information is sent after parsing the data frame.

In the interception process of the FPGA:

Compared with the prior art, the invention has the beneficial effects that:

the invention provides an industrial real-time Ethernet communication catcher, which does not change the original network topology structure, realizes network monitoring on the basis of not influencing the original communication quality and not causing transmission delay through the intervention of a probe, can acquire complete communication messages, and can upload running state information to a server through a narrowband Internet of things after processing the messages so as to realize remote monitoring.

Before network interception is performed, the corresponding analysis method is written in the CPU soft core of the FPGA according to the network type and the self requirement, so that the real-time Ethernet equipment in the current market can be intercepted, the flexibility is high, and the application range is wide.

The invention adopts the FPGA soft core technology to replace the singlechip as a microprocessor, has the advantages of high running speed, more pins, easy realization of a large-scale system and convenient secondary development of the FPGA serving as a hardware technology, and greatly improves the integration and performance of the system.

The wireless output module adopted by the invention is a narrow-band internet of things (NB-IOT) module, and compared with wireless transmission modules such as Bluetooth, wifi and the like, the NB-IOT module has low power consumption, long transmission distance, good transmission quality in a closed space state and relatively small interference by environment, and is very suitable for transmitting data to the cloud for large data analysis. Therefore, the invention reduces the cost when realizing the function of wireless transmission and remote monitoring.

On the basis of not intervening in the original network topology, the data monitoring of the real-time industrial Ethernet is realized. The first network port and the second network port of the device are directly connected through the PCB wiring, so that network data can directly enter a network through the other network port while being uploaded, delay caused by processing and forwarding is avoided, and the requirement of small-period real-time communication is met. The device uses FPGA as a core device, adds a serial number and a time stamp to a network data frame, then sends the network data frame to a monitoring computer, simultaneously analyzes the data frame in a CPU soft core, acquires required state information, and uploads the state information to a server through an NB-IOT module. The hardware connection method is convenient and reliable, the cost is low, and a user can write a data frame analysis method according to the type of the network to be tested, so as to acquire the concerned state information. Has wide use value and application prospect in the field of industrial Ethernet.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application.

FIG. 1 is a schematic diagram of a hardware architecture of the present invention;

FIG. 2 is a diagram of a portal connection according to the present invention;

FIG. 3 is a block diagram of the internal functions of the FPGA of the present invention;

fig. 4 is a functional sub-block diagram of the internal upload module of the FPGA of the present invention.

Fig. 5 is a functional sub-block diagram of the FPGA internal data frame encapsulation module of the present invention.

Fig. 6 is a process of analyzing four network protocols of EtherCAT, POWERLINK, etherMAC, RTEX by the CPU soft core in the FPGA according to the present invention.

Fig. 7 shows a first embodiment of the present invention: setting network interception devices of a master station and a slave station aiming at the line type;

fig. 8 shows a second embodiment of the present invention: setting up network interception devices for ring-shaped master stations and slave stations.

Detailed Description

It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

As shown in fig. 1, a network interception apparatus includes:

the method comprises the steps that a first Ethernet interface receives downlink data transmitted by first equipment, the downlink data are sequentially transmitted to an FPGA through the first Ethernet interface, and after the FPGA listens for the downlink data, the detected data are transmitted to a cloud server through a narrow-band internet of things module NB-IoT; the downlink data are also transmitted to the FPGA through the first Ethernet interface, and the FPGA transmits the downlink data to the monitoring computer through the third Ethernet interface module; the downlink data also sequentially pass through the first Ethernet interface and the second Ethernet interface, so that the data is directly transmitted to the second equipment by the first equipment, and the second equipment transmits the downlink data to the network;

The second Ethernet interface receives uplink data transmitted by the second equipment, the uplink data are sequentially transmitted to the FPGA through the second Ethernet interface, and after the FPGA listens for the uplink data, the detected data are transmitted to the cloud server through the narrow-band internet of things module NB-IoT; the uplink data are also transmitted to the FPGA through the second Ethernet interface, and the FPGA transmits the uplink data to the monitoring computer through the third Ethernet interface module; the uplink data also sequentially pass through the second Ethernet interface and the first Ethernet interface, so that the data is directly transmitted to the first equipment by the second equipment, and the first equipment transmits the uplink data to the network;

the first RJ45 network port is connected with the second RJ45 network port, so that delay of Ethernet communication caused by data interception is avoided;

The hardware part of the invention takes the FPGA as a core component, acquires the data frame in the industrial Ethernet, processes the data, extracts the required state information, and finally can select the Ethernet or the narrow-band Internet of things NB-IOT to upload the data according to different purposes, and the components are mutually matched to realize the nondestructive monitoring and the remote monitoring of the industrial Ethernet.

The FPGA module is an FPGA chip of ALTERA company, and the data frame is analyzed by using the CPU soft core technology of the FPGA and uploaded through the NB-IOT module.

The power module comprises a DC24V input serving as a main input of a power supply, a 5V power supply voltage stabilizing chip and a DC5V-3.3V, DC V-2.5V, DC V-1.2V voltage stabilizing chip.

The Ethernet interface module comprises three groups of PHY chips, network port transformers and RJ45 network ports. Two groups of the two channels are used as a 'one-in one-out' channel for monitoring industrial Ethernet communication, and the other group of the two channels is used as an interface between a network monitoring device and a monitoring computer.

The communication state indicating module comprises a power supply indicating lamp, an Ethernet connection state indicating lamp, an Ethernet communication state indicating lamp and an NB-IOT narrowband Internet of things communication indicating lamp.

The NB-IOT narrowband Internet of things module is a telecommunication NB-IOT module with a frequency band of 850 MHz.

The crystal oscillator circuit selects 50MHz crystal oscillator to provide a required main frequency clock for the FPGA.

The RX signal line between the network ports of the first channel and the second channel of the industrial Ethernet is directly connected with the TX signal line of the other network port through the PCB wiring, so that communication delay caused by data processing is avoided. As shown in fig. 2.

The FPGA internal design is divided into a data frame packaging module and an uploading module. The data frame encapsulation module has the functions of adding information such as a serial number, a time stamp and the like into the data frame of the local network port to form a new data frame, transmitting the new data frame to the uploading module to wait for uploading, and uploading the new data frame to the CPU soft core part to wait for analysis. The uploading module has the function of storing the data of 2 network ports into a cache and uploading the data to the monitoring computer. As shown in fig. 3.

The uploading module consists of 8 FIFOs, and each port independently corresponds to 4 FIFOs with different sending priorities to buffer the data of the data packet of the port. In order to prevent errors caused by the fact that the corresponding FIFO is fully occupied due to the fact that the data volume of one port is too large in a period of time, the write-in logic control unit allows the current port to occupy the idle FIFO resources of other ports. And the sending state machine polls the FIFO buffer module and sends the stored data frames to the monitoring computer. As shown in fig. 4.

After the CPU soft core module analyzes the data frame, the state information of the running of the equipment is obtained and uploaded to the server through the NB-IOT module. An operator can also remotely control through the NB-IOT module, actively acquire the complete data frame which is currently heard, and remotely monitor.

As shown in fig. 5, the first data frame encapsulation module and the second data frame encapsulation module each include: the system comprises an original data frame buffer module and a frame information adding module; wherein, the liquid crystal display device comprises a liquid crystal display device,

As shown in fig. 6, after the CPU soft core receives a data frame, it first determines which of the four industrial ethernet networks belongs to EtherCAT, POWERLINK, etherMAC, RTEX.

For EtherCAT data frames, the slave station directly inserts the state information into the control information issued by the master station, the state information field of the slave station needs to be identified according to the state word, then the state information of the slave station is extracted one by one according to the flag bit, the state information is put in the corresponding variable, and finally the information is uploaded to the server through the NB-IOT.

For the POWERLINK data frames, the return data frames Pres of the secondary stations are separated, the return data frames Pres of the secondary stations are identified, state data of the secondary stations are extracted from the data frames, the state data are placed in corresponding variables, and finally information is uploaded to a server through the NB-IOT.

For EtherMAC data frames, the status information returned by the secondary stations is all integrated in one data frame and is separate from the control data frame issued by the primary station. Firstly, a return data frame is identified, then state information of the secondary stations is extracted one by one according to the zone bit, the state information is placed in corresponding variables, and finally, the information is uploaded to a server through the NB-IOT.

For RTEX data frames, the return data frame is also integrated in one data frame and is separate from the control data frame, but it has no flag bit, the meaning of the data for each location is fixed. Therefore, the return data frame is firstly identified, then the running state data of each secondary station is extracted according to the field position and put in the corresponding variable, and finally the information is uploaded to the server through the NB-IOT.

Application example: two examples

1. In the constructed EtherCAT industrial Ethernet with linear topology, a master station transmits a control data frame, the data frame sequentially passes through cascaded slave stations to reach the last slave station, and at the moment, the slave nodes initiate feedback data frames and then reversely transmit the feedback data frames back to the master station. Then, in connection with the network cable, the transmitting network port of the master station is connected with the network port 1 of the device, and the network port 2 of the device is connected with the receiving network port of the slave station 1, wherein the connection mode is shown in fig. 7. In this application example, the network ports all adopt a full duplex working mode, and the same network port can transmit both downlink data frames, i.e. control data frames, and uplink data frames, i.e. feedback data frames.

When transmitting downlink data frames, the differential signals 'RX+' and 'RX-' of the network port 1 are directly connected with the differential signals 'TX+' and 'TX-' of the network port 2 through the PCB wiring, so that the control data frames are divided into two paths at the network port 1, and one path is directly transmitted to the slave station 1 through the network port 2, and the physical connection between the master station and the slave station 1 is equivalent to the connection directly through the network cable, only the increased wires are adopted, and the delay effect caused by the increased wires is negligible. The communication period of EtherCAT is extremely short, and the normal communication of industrial Ethernet with extremely high real-time requirements cannot be influenced. Meanwhile, the network port 1 uploads the other path of instruction data to the FPGA through the PHY chip for subsequent processing. Similarly, when the uplink data frame is transmitted, the differential signals RX+ and RX-of the network port 2 are directly connected with the differential signals TX+ and TX-of the network port 1 through the PCB wiring, so that the feedback data frame is divided into two paths at the network port 2, one path is transmitted back to the master station through the network port 1, and the other path is uploaded to the FPGA through the PHY chip of the network port 2 for subsequent processing.

In the FPGA, the function of the data frame encapsulation module is to add information such as serial numbers, time stamps and the like to the data frames uploaded by the corresponding network ports to form new data frames, and the new data frames are transmitted to the uploading module to wait for uploading and the CPU soft core part to wait for analysis. The uploading module has the function of storing the data of the two network ports into a cache and uploading the data to the monitoring computer. Meanwhile, the CPU soft core processes the uplink and downlink data frames, obtains the running state of the equipment, and uploads the required information to the server through the NB-IOT narrowband Internet of things module for big data analysis. In addition, an operator can remotely initiate a monitoring request through the NB-IOT narrowband Internet of things module, and the current data frame captured by the FPGA is completely sent to the cloud end, so that the function of remote monitoring is achieved.

2. For the industrial Ethernet with ring topology, the master station transmits control data frames sequentially through the slave stations, the last slave station is connected with the master station, and feedback data frames containing state information of the slave stations are directly transmitted back to the master station. At this time, the network interception device is installed between the last slave station and the master station, the transmission port of the last slave station is connected with the port 1 of the device, the port 2 of the device is connected with the receiving port of the master station, and the connection mode is shown in fig. 8.

When a data frame is transmitted to the last slave station, there are both control data frames and feedback data frames (according to different real-time ethernet protocols, the two data frames may be integrated in one data frame or may be split into two). Because the differential signals RX+ and RX-of the network port 1 are directly connected with the differential signals TX+ and TX-of the network port 2 through the PCB wiring, the data frame is divided into two paths at the network port 1, and one path is directly transmitted back to the master station through the network port 2, so that normal communication is completed. Meanwhile, the network port 1 uploads the other path of instruction data to the FPGA through the PHY chip for subsequent processing.

The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A network listening device, comprising:

The FPGA comprises: the device comprises a CPU soft core module, an NB-IOT driving module, an uploading module, a time stamp module, a first data frame encapsulation module, a second data frame encapsulation module, a first port, a second port and a third port;

the CPU soft core module is used for analyzing the data frames encapsulated by the first data frame encapsulation module or the second data frame encapsulation module, extracting the required equipment state information, controlling the NB-IOT driving module to send the data to the narrow-band Internet of things module NB-IOT, and sending the data to the cloud server by the narrow-band Internet of things module NB-IOT; meanwhile, the CPU soft core module processes an instruction of remote control of an operator through the narrow-band internet of things module NB-IoT to finish corresponding operation;

the NB-IOT driving module is used for realizing the normal operation of the narrow-band Internet of things module NB-IOT by the CPU soft check;

The second port receives the data uploaded by the second Ethernet interface module, packages the uploaded data through the second data frame packaging module, sends the packaged data to the third port through the uploading module, and simultaneously uploads the packaged data to the CPU soft core for processing, and sends the data to the narrow-band Internet of things module NB-IOT through the NB-IOT module, and the narrow-band Internet of things module NB-IOT sends the data to the cloud server.

2. A network listening device as claimed in claim 1, wherein,

the second Ethernet interface module receives uplink data transmitted by the second equipment, the uplink data are sequentially transmitted to the FPGA through the second Ethernet interface module, and after the FPGA listens for the uplink data, the detected data are transmitted to the cloud server through the narrow-band Internet of things module NB-IoT; the FPGA also transmits all uplink data to the monitoring computer through the third Ethernet interface module; the uplink data also sequentially passes through the second Ethernet interface module and the first Ethernet interface module, so that the data is directly transmitted to the first device by the second device, and the first device transmits the uplink data to the network.

3. A network listening device as claimed in claim 1, wherein,

the transmitting signal line of the first RJ45 network port is connected with the receiving signal line of the second RJ45 network port through PCB wiring;

the third ethernet interface module includes: the third PHY chip, the third network port transformer and the third RJ45 network port are sequentially connected; the third PHY chip is connected with the FPGA, and the third RJ45 network port is connected with the monitoring computer;

4. A network listening system, comprising: the system comprises a network interception device, a cloud server, a interception computer, a first device and a second device of a real-time industrial Ethernet;

5. A method of network interception, comprising:

6. A network listening method as defined in claim 5, wherein,

7. A network listening method as defined in claim 5, wherein,

in the interception process of the FPGA:

The differential signal RX+ of the first RJ45 network port of the first Ethernet interface module is connected with the differential signal TX+ of the second RJ45 network port of the second Ethernet interface module; the TX+ of the first network port is connected with the RX+ of the second network port;

8. A method of network interception, comprising:

9. The method of claim 8, wherein the retrieving the corresponding pre-stored network data frame parsing method from the FPGA parses the different types of network data frames, and uploads the parsed required device state information to the cloud server through the NB-IOT narrowband internet of things, which means: