CN114745403B - Industrial network communication system and industrial network communication method - Google Patents
Industrial network communication system and industrial network communication method Download PDFInfo
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- H—ELECTRICITY
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/06—Management of faults, events, alarms or notifications
- H04L41/0654—Management of faults, events, alarms or notifications using network fault recovery
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- H—ELECTRICITY
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
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Abstract
The embodiment of the application provides an industrial network communication system and method. The system comprises: first and second field devices located within different virtual area networks, the first and second field devices being connected by first and second subnets in parallel. The first field device is configured to insert the first subnet mark and the second subnet mark into the first service data to be sent to obtain first mark data and second mark data, send the first mark data to the second field device via the first access switch, the first aggregation switch and the third access switch of the first subnet, and send the second mark data to the second field device via the second access switch, the second aggregation switch and the fourth access switch of the second subnet. And the second field device is used for receiving the first marking data and the second marking data and removing the subnet marking of the data received first in the first marking data and the second marking data to obtain the first service data.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to an industrial network communication system and an industrial network communication method.
Background
Factory automation systems typically include a plurality of automation devices that are networked to one another via an industrial communication network and devices for control or regulation in the context of production or process automation. The various devices in the factory automation system cooperate to accomplish production tasks by making various communications.
In order to avoid paralysis of the whole communication system caused by network disconnection, switch faults and the like, a factory automation system generally adopts an industrial looped network and looped network coupling mode to realize higher physical link redundancy. However, such network communication systems have a significant time expenditure in terms of network convergence (e.g., typically on the order of milliseconds or more), and may not be suitable for some industrial network applications where network convergence is critical, because the physical path of the network communication is subject to network instability due to some intolerable objective factors (e.g., light attenuation, line aging, etc.). For example, in some applications in the petrochemical industry, it is often necessary to implement a 0ms handover to ensure high reliability of the network. Such network communication systems as described above are not capable of meeting the application requirements of the petrochemical industry and other industries having similar requirements.
Disclosure of Invention
In view of the above, the present invention provides an industrial network communication system for at least partially solving the above-mentioned technical problems.
In a first aspect, embodiments of the present application provide an industrial network communication system, including: first and second field devices located within different virtual area networks, the first and second field devices being connected by first and second subnets in parallel;
the first subnetwork comprises a first access switch, a third access switch and a first aggregation switch connected with the first access switch and the third access switch, wherein the first access switch and the third access switch are respectively connected to a first field device and a second field device; the second subnetwork comprises a second access switch, a fourth access switch and a second aggregation switch which are respectively redundant with the first access switch, the third access switch and the first aggregation switch;
the first field device is configured to insert a first subnet mark and a second subnet mark into first service data to be sent to obtain first mark data and second mark data, send the first mark data to the second field device via the first access switch, the first aggregation switch and the third access switch, and send the second mark data to the second field device via the second access switch, the second aggregation switch and the fourth access switch;
The second field device is configured to receive the first tag data and the second tag data, and remove a subnet tag of data received first in the first tag data and the second tag data to obtain the first service data.
In one possible implementation, the first field device is provided in a plurality, and the plurality of first field devices are respectively connected with the first access switch and the second access switch; and/or the second field device is arranged in a plurality, and the plurality of the second field devices are respectively connected with the first access switch and the second access switch.
In one possible implementation, the industrial network communication system further comprises a control center and at least one protocol conversion switch; the first aggregation switch and the second aggregation switch are connected with the at least one protocol conversion switch;
the first field device is further configured to insert the first subnet mark and the second subnet mark into second service data to be sent to obtain third mark data and fourth mark data, forward the third mark data to the at least one protocol conversion switch via the first access switch and the first aggregation switch, and send the fourth mark data to the at least one protocol conversion switch via the second access switch and the second aggregation switch;
The at least one protocol conversion switch is configured to receive the third tag data and the fourth tag data, remove a network tag of data received first in the third tag data and the fourth tag data to obtain the second service data, and forward the second service data to the control center.
In one possible implementation, the number of the at least one protocol conversion switch is two;
the two protocol conversion switches perform real-time communication so that the protocol conversion switch which receives the third tag data and/or the fourth tag data later in the two protocol conversion switches discards the third tag data and/or the fourth tag data.
In one possible implementation manner, the second field device is further configured to insert the first subnet mark and the second subnet mark into third service data to be sent to obtain fifth mark data and sixth mark data, forward the fifth mark data to the at least one protocol conversion switch via the third access switch and the first aggregation switch, and send the sixth mark data to the at least one protocol conversion switch via the fourth access switch and the second aggregation switch;
The at least one protocol conversion switch is further configured to receive the fifth tag data and the sixth tag data, remove a network tag of data received first in the fifth tag data and the sixth tag data to obtain the third service data, and forward the third service data to the control center.
In one possible implementation, the first aggregation switch is configured to aggregate the third tag data and the fifth tag data, and determine priorities of the third tag data and the fifth tag data, so as to forward the third tag data and the fifth tag data to the at least one protocol conversion switch according to the determined priorities; and/or
The second aggregation switch is configured to aggregate the fourth tag data and the sixth tag data, and determine priorities of the fourth tag data and the sixth tag data, so as to forward the fourth tag data and the sixth tag data to the at least one protocol conversion switch according to the determined priorities.
In one possible implementation, the first field device and the second field device are each configured with a first network card, a second network card, and a processing module;
The processing module of the first field device is configured to insert the first subnet mark and the second subnet mark into the first service data to obtain the first mark data and the second mark data, and control the first mark data to be sent to the second field device via a first network card of the first field device, and the second mark data to be sent to the second field device via a second network card of the first field device;
the processing module of the second field device is configured to control to receive the first tag data via a first network card of the second field device, receive the second tag data via a second network card of the second field device, and remove a subnet tag of data received first in the first tag data and the second tag data to obtain the first service data.
In one possible implementation, the control center includes a first monitoring device and a second monitoring device that are redundant to each other, and the industrial network communication system further includes a first core switch connected to the first monitoring device and a second core switch connected to the second monitoring device;
One of the two protocol conversion switches is connected to the first core switch, the other of the two protocol conversion switches is connected to the second core switch, and the first core switch is in communication connection with the second core switch.
In one possible implementation, the first access switch, the second access switch, the first aggregation switch, the third access switch, the fourth access switch, and the second aggregation switch are switches supporting parallel redundancy protocols.
In a second aspect, embodiments of the present application provide an industrial network communication method, which is applicable to an industrial network communication system, where the industrial network communication system includes: first and second field devices located within different virtual area networks, the first and second field devices being connected by first and second subnets in parallel; the first subnetwork comprises a first access switch, a third access switch and a first aggregation switch connected with the first access switch and the third access switch, wherein the first access switch and the third access switch are respectively connected to a first field device and a second field device; the second subnetwork comprises a second access switch, a fourth access switch and a second aggregation switch which are respectively redundant with the first access switch, the third access switch and the first aggregation switch; the method comprises the following steps:
Inserting a first subnet mark and a second subnet mark into first service data to be transmitted to obtain first mark data and second mark data, transmitting the first mark data to the second field device through the first access switch, the first convergence switch and the third access switch, and transmitting the second mark data to the second field device through the second access switch, the second convergence switch and the fourth access switch;
the second field device receives the first marking data and the second marking data, and removes a subnet marking of data received first in the first marking data and the second marking data to obtain the first service data.
In one possible implementation, the industrial network communication system further comprises a control center and at least one protocol conversion switch; the first aggregation switch is connected with the at least one protocol conversion switch; the method further comprises the steps of:
the first field device inserts the first subnet mark and the second subnet mark into second service data to be transmitted to obtain third mark data and fourth mark data, forwards the third mark data to the at least one protocol conversion switch through the first access switch and the first aggregation switch, and transmits the fourth mark data to the at least one protocol conversion switch through the second access switch and the second aggregation switch;
The at least one protocol conversion switch receives the third tag data and the fourth tag data, removes a network tag of data received first in the third tag data and the fourth tag data to obtain the second service data, and forwards the second service data to the control center.
In the industrial network communication system provided by the embodiment of the present application, since the first subnetwork includes a first access switch, a third access switch, and a first aggregation switch connected to the first access switch and the third access switch, the first access switch and the third access switch are respectively connected to a first field device and a second field device, the second subnetwork includes a second access switch, a fourth access switch, and a second aggregation switch that are respectively redundant to the first access switch, the third access switch, and the first aggregation switch, the first field device and the second field device are connected through a first subnetwork and a second subnetwork that are parallel, and the first field terminal inserts a first subnetwork marker and a second subnetwork marker into first service data to be transmitted to obtain first marker data and second marker data, and transmits the first marker data to the second field device via the first access switch, the first aggregation switch, and the third access switch of the first subnetwork, and the second marker data may be further removed from the first subnetwork and the second subnetwork through the second access switch, and the second subnetwork can be further removed from the first subnetwork. Because the data is transmitted in parallel through the first sub-network and the second sub-network, when one of the first sub-network and the second sub-network fails, the other one of the first sub-network and the second sub-network can actively take over the data transmission task, thereby realizing the network undisturbed switching communication between the first field device and the second field device and improving the reliability of the communication between the first field device and the second field device.
Drawings
Fig. 1 is a schematic architecture diagram of an industrial network communication system according to an embodiment of the present application;
FIG. 2 is a schematic diagram of another industrial network communication system according to an embodiment of the present application;
FIG. 3 is a schematic diagram of another industrial network communication system according to an embodiment of the present application;
fig. 4 is a schematic flow chart of an industrial network communication method according to an embodiment of the present application.
List of reference numerals:
100: first field device 200: second field device 301A: first access switch
301A: first access switch 302A: third access switch 302B: fourth access switch
401A: the first aggregation switch 401B: the second aggregation switch 500: protocol conversion switch
501: the first protocol conversion switch 502: second protocol conversion switch 601: first core switch
602: the second core switch 700: control center 701: first monitoring device
702: second monitoring device
S401: inserting the first subnet mark and the second subnet mark into the first service data to be transmitted to obtain first mark data and second mark data, transmitting the first mark data to the second field device via the first access switch, the first aggregation switch and the third access switch, and transmitting the second mark data to the second field device via the second access switch, the second aggregation switch and the fourth access switch
S402: the second field device receives the first marking data and the second marking data, and removes the subnet marking of the first received data in the first marking data and the second marking data to obtain the first service data
Detailed Description
For the purposes of making the objects, technical solutions, and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and examples. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other technical solutions obtained by a person skilled in the art based on the examples in the present application fall within the scope of protection of the present application.
In order to avoid paralysis of the whole communication system of the industrial automation system caused by network disconnection, switch failure and the like, in the existing industrial automation system, a high physical link redundancy is generally realized by adopting an industrial ring network and ring network coupling mode. Such network communication systems have a significant time expenditure in terms of network convergence, e.g., typically on the order of milliseconds or more and seconds or less. This is not applicable for industrial network applications such as the petrochemical industry where network convergence is critical. For example, in the petrochemical industry, it is often necessary to implement a 0ms handover to ensure high reliability of the network. Further, in such a network communication system, the physical path of network communication causes network instability of the whole network due to some unavoidable objective factors (e.g., optical attenuation, line aging, etc.), thereby affecting production.
Based on the above-mentioned problems, embodiments of the present application provide an industrial network communication system and an industrial network communication method, so as to at least partially solve the above-mentioned technical problems.
Specific implementations of embodiments of the present application are described in detail below with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of an industrial network communication system according to an embodiment of the present application. As shown in fig. 1, the industrial network automation system includes a first field device 100 and a second field device 200 located within different virtual area networks. Specifically, as shown in FIG. 1, a first field device 100 is located within a first virtual local area network 10 and a second field device 200 is located within a second virtual local area network 20. The first field device 100 and the second field device 200 are typically different field devices that perform a work task in an industrial field or that control the execution of related devices to perform a work task. The first field device 100 and the second field device 200 may be located within different virtual local area networks of the same operating area of an industrial site. Taking the petrochemical industry as an example, for example, the first field device 100 and the second field device 200 may be field devices located within two isolated virtual local area networks of a refinery area. The first field device 100 and the second field device 200 may also be located within different virtual local area networks of different work areas. For example, the first field device 100 is located in a refinery area, the second field device is located in a light-diameter cracking area, a polyethylene processing area, a storage and oil depot area, or a utility area.
The first field device 100 and the second field device 200 are connected by a first subnetwork and a second subnetwork in parallel. The first subnetwork includes a first access switch 301A, a third access switch 302A, and a first aggregation switch 401A connected to the first access switch 301A and the third access switch 302A, the first access switch 301A and the third access switch 302A being connected to the first field device 100 and the second field device 200, respectively; the second subnetwork includes a second access switch 301B, a fourth access switch 302B, and a second aggregation switch 401B that are redundant with the first access switch 301A, the third access switch 302A, and the first aggregation switch 401A, respectively.
The first field device 100 is configured to insert the first subnet mark and the second subnet mark into the first service data to be sent to obtain first mark data and second mark data, send the first mark data to the second field device 200 via the first access switch 301A, the first aggregation switch 401A and the third access switch 302A, and send the second mark data to the second field device 200 via the second access switch 301B, the second aggregation switch 401B and the fourth access switch 302B;
The second field device 200 is configured to receive the first tag data and the second tag data, and remove a subnet tag of the first received data in the first tag data and the second tag data to obtain the first service data.
Specifically, as shown in fig. 1, a first access switch 301A and a third access switch 302A are used to access the first field device 100 and the second field device 200, respectively, to a first subnetwork. The second access switch 301B and the fourth access switch 302B are switches provided in redundancy with the first access switch 301A and the third access switch 302A, respectively. The second access switch 301B and the fourth access switch 302B are used to access the first field device 100 and the second field device 200 to a second subnetwork in parallel with the first subnetwork. The first access switch 301A and the second access switch 301B are located within the first virtual local area network 10 where the first field device 100 is located. The third access switch 302A and the fourth access switch 302B are located within the second virtual local area network 20 where the second field device 200 is located.
The first aggregation switch 401A is configured to implement routing between the first virtual local area network 10 and the second virtual local area network 20. The first access switch 301A located within the first virtual local area network 10 may be network connected through a first aggregation switch 401A to a third access switch 302A located within the second virtual local area network 20. The first aggregation switch 401A may also aggregate the first tag data forwarded from the first access switch 301A and the third access switch 302A.
A second aggregation switch 401B, which is arranged redundant to the first aggregation switch 401A, is also used to implement routing between the first virtual local area network 10 and the second virtual local area network 20. The second access switch 301B located within the first virtual local area network 10 may be in network connection with the fourth access switch 302B located within the second virtual local area network 20 through the second aggregation switch 401B. The second aggregation switch 401B may also aggregate the second tag data forwarded from the second access switch 302A and the fourth access switch 302B.
In one embodiment of the present application, the first access switch 301A, the second access switch 301B, the third access switch 302A, the fourth access switch 302B, the first aggregation switch 401A, and the second aggregation switch 401B are all switches supporting parallel redundancy protocols.
In this embodiment, when the first field device 100 needs to send the first service data to the second field device 200, the first field device 100 inserts the first subnet mark and the second subnet mark into the first service data to be sent, so as to obtain the first mark data and the second mark data. Thereafter, the first field device 100 transmits the first marking data to the first access switch 301A via the first network segment of the first subnetwork. The first access switch sends the received first label data to the first aggregation switch 401A via the second network segment of the first subnetwork. The first aggregation switch 401A transmits the received first tag data to the third access switch 302A via the third network segment of the first subnet. The third access switch 302A transmits the received first marking data to the second field device 200 via the fourth segment of the first subnetwork.
At the same time, the first field device 100 also transmits second marking data to the second access switch 301B via the first network segment of the second subnetwork. The second access switch 301B sends the received second label data to the second aggregation switch 401B via the second network segment of the second subnet. The second aggregation switch 401B transmits the received second tag data to the fourth access switch 302B via the third network segment of the second subnet. The fourth access switch 302B transmits the received second marking data to the second field device 200 via the fourth segment of the second subnetwork.
The second field device 200, upon receiving the first tag data and the second tag data, removes the subnet tag of the first received data of the first tag data and the second tag data to obtain the first service data.
For example, in the case where there is no failure in both the first subnet and the second subnet, if the first tag data arrives at the second field device 200 first, the second tag data arrives at the second field device 200 later, and the second field device 200 may remove the first subnet tag in the first tag data to obtain the first service data. In addition, the second field device 200 may discard or delete the second marking data. The working engineering and principles of the second tag data when it first arrives at the second field device 200 are similar and will not be described in detail herein.
For another example, in the case where one of the first subnet and the second subnet has a failure, as shown in fig. 1, in the case where a certain network segment or a switch in the first subnet has a failure, the first tag data cannot reach the second field device 200, and the second tag data normally reach the second field device 200, and since the second field device 200 receives the second tag data first, the second field device 200 may remove the second subnet tag in the second tag data, to obtain the first service data. The working engineering and principle when the second subnetwork has a fault are similar, and will not be described here again.
Since the second field device 200 may still receive the tag data forwarded through the other of the first subnetwork and the second subnetwork at the same time in case of a failure of the switch in one of the first subnetwork and the second subnetwork or a disconnection of some or all network segments and is not available, the first service data may be obtained by processing the tag data, and the communication between the first field device 100 and the second field device 200 is substantially not affected, i.e. a network-undisturbed switching communication between the first field device 100 and the second field device 200 is achieved. At the same time, the second field device 200 processes the marking data that first arrives at the second field device 200, which is advantageous for communication efficiency and real-time between the first field device 100 and the second field device 200.
In one implementation of the present application, the first field device 100 and the second field device 200 are each configured with a first network card, a second network card, and a processing module. The processing module of the first field device 100 is configured to insert the first subnet mark and the second subnet mark into the first service data to obtain the first mark data and the second mark data, and control the first mark data to be sent to the second field device 200 via the first network card of the first field device 100, and the second mark data to be sent to the second field device 200 via the second network card of the first field device 100. The processing module of the second field device 200 is configured to control receiving the first tag data via the first network card of the second field device 200, receiving the second tag data via the second network card of the second field device 200, and removing a subnet tag of the first received data of the first tag data and the second tag data to obtain the first service data. In a specific implementation manner of the present application, the processing modules of the first field device 100 and the second field device 200 are configured with Softnet RNA software, and the processing modules configured with the Softnet RNA software may enable the first field device 100 and the second field device 200 to access the first subnet and the second subnet through the first network card and the second network card respectively by using the same MAC address and the IP address, so as to provide a possibility for implementing network undisturbed switching communication between the first field device 100 and the second field device 200.
It should be appreciated that for ease of description, only one first field device 100 and one second field device 200 are shown within the first virtual local area network 10 and the second virtual local area network 20, respectively, in fig. 1. It should be appreciated that in actual practice, the first virtual local area network 10 and the second virtual local area network 20 are a plurality of first field devices 100 and a plurality of second field devices 200, respectively.
Wherein the plurality of first field devices 100 are connected to the first access switch 301A and the second access switch 301B for forwarding the plurality of first tag data via said first access switch 301A to the first aggregation switch 401A, while forwarding the plurality of second tag data via the second access switch 301B to the second aggregation switch 401B. The first aggregation switch 401A and the second aggregation switch 401B may aggregate the plurality of first tag data and the plurality of second tag data, respectively, and forward the plurality of first tag data and the plurality of second tag data to the third access switch 302A and the fourth access switch 302B, respectively, for forwarding to the second field device 200 via the third access switch 302A and the fourth access switch 302B, respectively, to enable redundancy of communication between the first field device 100 and the second field device 200. In this manner, network undisturbed switching communications between the plurality of first field devices 100 and the plurality of first field devices 100 are achieved in the event of a failure of the first subnetwork or the second subnetwork.
In this embodiment of the present application, in the case where a switch of one of the first subnet and the second subnet fails or a part or all of the network segments are disconnected and unavailable, the second field device 200 may still receive corresponding tag data through the other of the first subnet and the second subnet, and further may obtain the first service data by removing the subnet tag of the tag data, where communication between the first field device 100 and the second field device 200 is not substantially affected by any influence. That is, since data is transmitted in parallel through the first and second subnets, when one of the first and second subnets fails, the other of the first and second subnets actively takes over the data transfer tasks, enabling network-undisturbed switching communications between the first and second field devices 100 and 200.
Based on the industrial network communication system shown in fig. 1, in one embodiment of the present application, as shown in fig. 2, the industrial network communication system further comprises a control center 700 and at least one protocol conversion switch 500. The first aggregation switch 401A and the second aggregation switch 401B are connected to at least one protocol conversion switch 500.
The first field device 100 is further configured to insert the first subnet mark and the second subnet mark into the second traffic data to be transmitted to obtain third mark data and fourth mark data, and forward the third mark data to the at least one protocol conversion switch 500 via the first access switch 301A and the first aggregation switch 401A, and forward the fourth mark data to the at least one protocol conversion switch 500 via the second access switch 301B and the second aggregation switch 401B.
The at least one protocol conversion switch 500 is configured to receive the third tag data and the fourth tag data, remove the network tag of the first received data in the third tag data and the fourth tag data to obtain second service data, and forward the second service data to the control center 700.
Wherein the control center 700 may be a remote control center 700 for monitoring the first field device 100. For example, control center 700 may monitor the operating state of first field device 100 by receiving second traffic data sent by first field device 100 over the first and second subnets.
The at least one protocol conversion switch 500 may convert the third tag data or the fourth tag data into the second service data by removing the first subnet tag of the third tag data or the second subnet tag of the fourth tag data so as to be transmitted to the control center 700 through the network supporting the standard ethernet protocol. In one implementation of the present application, the at least one protocol conversion switch 500 may be a switch that supports parallel redundancy protocol to standard ethernet protocol conversion.
When the first field device 100 needs to send the second service data to the control center 700, the first field device 100 inserts the first subnet mark and the second subnet mark into the second service data to be sent, so as to obtain third mark data and fourth mark data. Thereafter, the first field device 100 transmits the third marking data to the first access switch 301A via the first network segment of the first subnetwork. The first access switch 301A sends the received third tag data to the first aggregation switch 401A via the second network segment of the first subnetwork. The first aggregation switch 401A transmits the received third tag data to the at least one protocol conversion switch 500 via the fifth network segment of the first subnet.
At the same time, the first field device 100 also transmits fourth marking data to the second access switch 301B via the first network segment of the second subnetwork. The second access switch 301B sends the received fourth label data to the second aggregation switch 401B via the second network segment of the second subnetwork. The second aggregation switch 401B transmits the received fourth flag data to the at least one protocol conversion switch 500 via the fifth network segment of the second subnet.
The at least one protocol conversion switch 500 receives the third tag data and the fourth tag data, removes a network tag of the first received data of the third tag data and the fourth tag data to obtain second service data, and forwards the second service data to the control center 700.
For example, in the case that there is no failure in both the first subnet and the second subnet, if the third label data arrives at the at least one protocol conversion switch 500 first, the fourth label data arrives at the at least one protocol conversion switch 500 later, and the at least one protocol conversion switch 500 may remove the first subnet label in the third label data to obtain the second service data. Meanwhile, the at least one protocol conversion switch 500 may discard or delete the fourth flag data. The operation and principle of the fourth tag data when it first arrives at the second field device 200 are similar, and will not be described here again.
For another example, in the case where one of the first subnet and the second subnet has a failure (the failure may be represented by an "X" identifier), as shown in fig. 3, in the case where a certain network segment or switch in the first subnet has a failure, the third flag data cannot reach the at least one protocol conversion switch 500, and the fourth flag data normally reaches the second field device 200, and since the at least one protocol conversion switch 500 receives the fourth flag data first, the at least one protocol conversion switch 500 may remove the second subnet flag in the fourth flag data, to obtain the second service data. The working process and principle when the second subnetwork has a fault are similar, and will not be described here again.
Since the at least one protocol conversion switch 500 may still receive the tag data forwarded through one of the first subnetwork and the second subnetwork at the same time in case of a failure of the switch in one of the first subnetwork and the second subnetwork or a disconnection of some or all network segments and is not available, the second service data may be obtained by processing the tag data, and the communication between the first field device 100 and the control center 700 is substantially not affected, i.e. a network undisturbed switching communication between the first field device 100 and the control center 700 is achieved. This facilitates communication efficiency and real-time between the first field device 100 and the control center 700, as the at least one protocol conversion switch processes the first arriving tag data.
In one implementation of the present application, the number of the at least one protocol conversion switch 500 is two, and the two protocol conversion switches communicate in real time, so that the protocol conversion switch that receives the third flag data and/or the fourth flag data later in the two protocol conversion switches discards the third flag data and/or the fourth flag data.
As further shown in fig. 2, the two protocol conversion switches are a first protocol conversion switch 501 and a second protocol conversion switch 502, respectively. The first aggregation switch 401A forwards the third tag data received from the first access switch 301A to the first protocol conversion switch 501 and the second protocol conversion switch 502, respectively. The second aggregation switch 401B forwards the third tag data received from the second access switch 301B to the first protocol conversion switch 501 and the second protocol conversion switch 502, respectively.
The first protocol conversion switch 501 and the second protocol conversion switch 502 communicate in real time. If the first protocol conversion switch 501 receives the third flag data and/or the fourth flag data first, the first protocol conversion switch 501 informs the second protocol conversion switch 502 to discard the received third flag data and/or fourth flag data through heartbeat communication. In addition, the first protocol conversion switch 501 may remove the network tag of the first received data of the third tag data and the fourth tag data to obtain the second service data, and forward the second service data to the control center 700. The operation and principle of the second protocol conversion switch 502 when it first receives the third flag data and/or the fourth flag data are similar, and will not be described herein.
Due to the two protocol conversion switches which are arranged in a redundancy manner, network undisturbed switching communication between the first field device 100 and the control center 700 can be ensured, and meanwhile, through real-time communication between the two protocol conversion switches, redundant data transmitted to the control center 700 are reduced, and occupation of processing capacity and storage space of the control center 700 is avoided.
In one embodiment of the present application, with continued reference to fig. 2, the control center 700 includes a first monitoring device 701 and a second monitoring device 702 that are redundant to each other, and the industrial network communication system further includes a first core switch 601 connected to the first monitoring device 701 and a second core switch connected to the second monitoring device 702. One of the two protocol conversion switches 501, 502 is connected to a first core switch 601 and the other of the two protocol conversion switches 501, 502 is connected to a second core switch, the first core switch 601 being communicatively connected to the second core switch 602.
The first core switch 601 and the second core switch 602 are switches located at the core layer of the backbone portion of the network. Router redundancy is achieved between the first core switch 601 and the second core switch 602 by a virtual router redundancy protocol (Virtual Router Redundancy Protocol, VRRP), routing path control is achieved by an internal gateway protocol, open shortest path first (OSPF, open Shortest Path First), with static routing, and high transmission rate logical connections are made by (Link Aggregation Control Protocol Data Unit, LACP) link aggregation control protocol components, thereby enabling redundancy capability, reliability and high speed transmission of the network backbone portion.
As shown in fig. 2, the first protocol conversion switch 501 is connected to the first core switch 601, the second protocol conversion switch 502 is connected to the second core switch 602, and the first core switch 601 is connected to the second core switch 602, so as to provide network redundancy, and further improve the stability of communication between the control center 700 and the field terminal.
In another embodiment of the present application, as shown in fig. 2, the second field device 200 is further configured to insert the first subnet mark and the second subnet mark into the third service data to be sent to obtain fifth mark data and sixth mark data, forward the fifth mark data to the at least one protocol conversion switch 501A, 501B via the third access switch 302A and the first aggregation switch 401A, and forward the sixth mark data to the at least one protocol conversion switch 501A, 501B via the fourth access switch 302B and the second aggregation switch 401B.
At least one protocol conversion switch 501A, 501B is further configured to receive the fifth tag data and the sixth tag data, remove the network tag of the first received data in the fifth tag data and the sixth tag data to obtain third service data, and forward the third service data to the control center 700.
As shown in fig. 2, the network connection between the second field device 200 and the control center 700 is similar to the connection between the first field device 100 and the control center 700, and will not be described in detail herein for the sake of brevity.
In this embodiment of the present application, in the case that a switch in one of the first subnet and the second subnet fails or a part or all of network segments are disconnected and unavailable, the at least one protocol conversion switch may still receive the tag data forwarded through the other one of the first subnet and the second subnet, and the second service data and the third service data may be obtained by processing the tag data, so that communication between the first field device 100 and the control center 700 is not substantially affected, that is, network undisturbed switching communication between the first field device 100 and the second field device 200 and the control center 700 is achieved, and communication stability between the field device and the control center 700 is improved.
In one implementation of the present application, the first aggregation switch 401A is configured to aggregate the third tag data and the fifth tag data and determine priorities of the third tag data and the fifth tag data to forward the third tag data and the fifth tag data to the at least one protocol conversion switch according to the determined priorities, and/or the second aggregation switch 401B is configured to aggregate the fourth tag data and the sixth tag data and determine priorities of the fourth tag data and the sixth tag data to forward the fourth tag data and the sixth tag data to the at least one protocol conversion switch according to the determined priorities
Specifically, the first aggregation switch 401A aggregates the third tag data from the first field device 100 forwarded from the first access switch 301A and the fifth tag data from the second field device 200 forwarded from the third access switch 302A. Upon receiving the third tag data and the fifth tag data, the first aggregation switch 401A may perform priority identification according to the received third tag data and the fifth tag data, determine the data with higher real-time requirements as the data corresponding to the service with higher priority, and preferentially forward the data to the protocol conversion switch, so that the protocol conversion switch may transmit the data to the control center 700.
Similarly, the second aggregation switch 401B aggregates the fourth tagged data from the first field device 100 forwarded from the second access switch 301B and the sixth tagged data from the second field device 200 forwarded from the third access switch 302A. Upon receiving the fourth tag data and the sixth tag data, the second aggregation switch 401B may perform priority identification according to the received fourth tag data and the sixth tag data, determine the data with higher real-time requirements as the data corresponding to the service with higher priority, and preferentially forward the data to the protocol conversion switch, so that the protocol conversion switch may transmit the data to the control center 700.
In this way, it can be ensured that data with high real-time requirements are transmitted and responded in time, so as to ensure real-time and accuracy of the control center 700 for controlling the field device.
Based on any of the foregoing embodiments, as shown in fig. 3, in one embodiment of the present application, the first field device 100 is provided in plurality, and the plurality of first field devices 100 are connected to the first access switch 301A and the second access switch 301B, respectively. That is, a plurality of first field devices 100 are included within the first virtual local area network 10. Each of the plurality of first field devices 100 is configured to insert the first subnet mark and the second subnet mark into fourth traffic data to be transmitted to obtain seventh mark data and eighth mark data, and transmit the seventh mark data to a target first field device 100 of the plurality of first field devices 100 via the first access switch 301A, and transmit the second mark data to the target first field device 100 via the second access switch 301B. Wherein the target first field device 100 is any first field device 100 of the plurality of first field devices 100 other than the first field device 100 that transmitted the fourth service data.
The target first field device 100 is configured to receive the seventh tag data and the eighth tag data, and remove a subnet tag of data received first in the seventh tag data and the eighth tag data to obtain fourth service data.
For ease of description, fig. 3 illustrates the inclusion of two first field devices 100 within the first virtual local area network 10. It should be appreciated that in other implementations, three or more first field devices 100 are included within the first virtual area network. In addition, for convenience of illustration, only the plurality of first field devices 100 in the first vlan 10 and their communication connections with the control center 700 are shown in fig. 3, and the second field terminals in the second vlan 20 and their connection communication connections with the control center 700 are similar to the foregoing embodiments, and are not repeated herein.
As shown in fig. 3, when the first field device 100A needs to transmit fourth traffic data to the first field device 100B, the first field device 100 inserts the first subnet mark and the second subnet mark into the fourth traffic data to be transmitted to obtain seventh mark data and eighth mark data, and transmits the seventh mark data to the first field device 100B (i.e., the target first field device 100) via the first access switch 301A of the first subnet, and transmits the second mark data to the target first field device 100 via the second access switch 301B of the second subnet.
Because in the case that the switch of one of the first sub-network and the second sub-network fails or a part or all of the network segments are broken and not available, as long as a complete physical link exists between the first field device 100 that transmits the fourth service data and the target field device, the target first field device 100 can receive the corresponding marking data, and further can acquire the fourth service data by removing the sub-network marking of the marking data, that is, because the data is transmitted in parallel through the first sub-network and the second sub-network, when one of the first sub-network and the second sub-network fails, the other of the first sub-network and the second sub-network actively takes over the data transmission task, thereby realizing the network undisturbed switching communication between the plurality of first field devices 100.
It should be understood that the second field device may also be provided in a plurality, and the communication process and principle of the second field device communicating with the control center are similar to the communication process and principle of the first field device communicating with the control center, and will not be described herein.
Fig. 4 is a flow chart of an industrial network communication method according to an embodiment of the present application, which is applicable to the industrial network communication system mentioned in the foregoing embodiment. The industrial network communication system includes: first and second field devices located within different virtual area networks, the first and second field devices being connected by first and second subnets in parallel; the first subnetwork comprises a first access switch, a third access switch, and a first aggregation switch connected to the first access switch and the third access switch, the first access switch and the third access switch being connected to the first field device and the second field device, respectively; the second subnetwork includes a second access switch, a fourth access switch, and a second aggregation switch that are redundant with the first access switch, the third access switch, and the first aggregation switch, respectively.
The method comprises step S401 and step S402.
Step S401: inserting the first subnet mark and the second subnet mark into first service data to be transmitted to obtain first mark data and second mark data, transmitting the first mark data to the second field device through the first access switch, the first convergence switch and the third access switch, and transmitting the second mark data to the second field device through the second access switch, the second convergence switch and the fourth access switch;
step S402: the second field device receives the first tag data and the second tag data and removes a subnet tag of the first received data of the first tag data and the second tag data to obtain the first service data.
In another embodiment of the present application, the industrial network communication system further comprises a control center and at least one protocol conversion switch; the first aggregation switch is connected with at least one protocol conversion switch; the method further comprises the steps of:
the first field device inserts the first subnet mark and the second subnet mark into second service data to be transmitted to obtain third mark data and fourth mark data, forwards the third mark data to the at least one protocol conversion switch through the first access switch and the first aggregation switch, and transmits the fourth mark data to the at least one protocol conversion switch through the second access switch and the second aggregation switch;
At least one protocol conversion switch receives the third marking data and the fourth marking data, removes the network marking of the first received data in the third marking data and the fourth marking data to obtain second service data, and forwards the second service data to the control center.
In another embodiment of the present application, the method comprises: the second field device inserts the first subnet mark and the second subnet mark into third service data to be transmitted to obtain fifth mark data and sixth mark data, forwards the fifth mark data to the at least one protocol conversion switch through a third access switch and a first aggregation switch, and transmits the sixth mark data to the at least one protocol conversion switch through a fourth access switch and a second aggregation switch;
at least one protocol conversion switch receives the fifth tag data and the sixth tag data, removes the network tag of the first received data in the fifth tag data and the sixth tag data to obtain third service data, and forwards the third service data to the control center.
In another embodiment of the present application, the first aggregation switch aggregates the third tag data and the fifth tag data and determines priorities of the third tag data and the fifth tag data to forward the third tag data and the fifth tag data to the at least one protocol conversion switch according to the determined priorities; and/or the second aggregation switch aggregates the fourth tag data and the sixth tag data and determines priorities of the fourth tag data and the sixth tag data to forward the fourth tag data and the sixth tag data to the at least one protocol conversion switch according to the determined priorities.
The industrial network communication method provided in the present embodiment is executed by the corresponding industrial network communication system in the foregoing system embodiments, and has the beneficial effects of the corresponding system embodiments, which are not described herein again. In addition, each step of the industrial network communication method of the present embodiment may refer to the description of the corresponding part in the foregoing system embodiment, which is not repeated herein.
While the invention has been illustrated and described in detail in the drawings and in the preferred embodiments, the invention is not limited to the disclosed embodiments, and it will be appreciated by those skilled in the art that the code audits of the various embodiments described above may be combined to produce further embodiments of the invention, which are also within the scope of the invention.
Claims (8)
1. An industrial network communication system, comprising: a first field device (100) and a second field device (200) located within different virtual area networks, the first field device (100) and the second field device (200) being connected by a first subnetwork and a second subnetwork in parallel;
the first subnetwork comprises a first access switch (301A), a third access switch (302A), and a first aggregation switch (401A) connected to the first access switch (301A) and the third access switch (302A), the first access switch (301A) and the third access switch (302A) being connected to a first field device (100) and a second field device (200), respectively; the second subnetwork comprises a second access switch (301B), a fourth access switch (302B) and a second aggregation switch (401B) that are redundant with the first access switch (301A), the third access switch (302A) and the first aggregation switch (401A), respectively;
The first field device (100) is configured to insert a first subnet mark and a second subnet mark into first service data to be sent to obtain first mark data and second mark data, send the first mark data to the second field device (200) via the first access switch (301A), the first aggregation switch (401A) and the third access switch (302A), and send the second mark data to the second field device (200) via the second access switch (301B), the second aggregation switch (401B) and the fourth access switch (302B);
the second field device (200) is configured to receive the first tag data and the second tag data, and remove a subnet tag of data received first in the first tag data and the second tag data to obtain the first service data;
wherein the industrial network communication system further comprises a control center (700) and at least one protocol conversion switch (500); -said first aggregation switch (401A) and said first aggregation switch (401B) are connected to said at least one protocol conversion switch (500);
the first field device (100) is further configured to insert the first subnet mark and the second subnet mark into second traffic data to be transmitted to obtain third mark data and fourth mark data, and forward the third mark data to the at least one protocol conversion switch (500) via the first access switch (301A) and the first aggregation switch (401A), and forward the fourth mark data to the at least one protocol conversion switch (500) via the second access switch (301B) and the second aggregation switch (401B);
The at least one protocol conversion switch (500) is configured to receive the third tag data and the fourth tag data, remove a network tag of data received first in the third tag data and the fourth tag data to obtain the second service data, and forward the second service data to the control center (700);
and wherein the at least one protocol conversion switch (500) is two in number; two protocol conversion switches (501, 502) communicate in real time such that a protocol conversion switch of the two protocol conversion switches (501, 502) that receives the third tag data and/or the fourth tag data later discards the third tag data and/or the fourth tag data.
2. The industrial network communication system of claim 1, wherein the first access switch (301A), the second access switch (301B), the first aggregation switch (401A), the third access switch (302A), the fourth access switch (302B), and the second aggregation switch (401B) are all switches supporting parallel redundancy protocols.
3. The industrial network communication system of claim 1 wherein,
The second field device (200) is further configured to insert the first subnet mark and the second subnet mark into third traffic data to be sent to obtain fifth mark data and sixth mark data, forward the fifth mark data to the at least one protocol conversion switch (500) via the third access switch (302A) and the first aggregation switch (401A), and forward the sixth mark data to the at least one protocol conversion switch (500) via the fourth access switch (302B) and the second aggregation switch (401B);
the at least one protocol conversion switch (500) is further configured to receive the fifth tag data and the sixth tag data, remove a network tag of a data received first in the fifth tag data and the sixth tag data to obtain the third service data, and forward the third service data to the control center (700).
4. The industrial network communication system according to claim 3, wherein the first aggregation switch (401A) is configured to aggregate the third tag data and the fifth tag data and determine priorities of the third tag data and the fifth tag data, so as to forward the third tag data and the fifth tag data to the at least one protocol conversion switch (500) according to the determined priorities; and/or
The second aggregation switch (401B) is configured to aggregate the fourth tag data and the sixth tag data and determine priorities of the fourth tag data and the sixth tag data, so as to forward the fourth tag data and the sixth tag data to the at least one protocol conversion switch (500) according to the determined priorities.
5. The industrial network communication system of claim 1, wherein the first field device (100) and the second field device (200) are each configured with a first network card, a second network card, and a processing module;
a processing module of the first field device (100) configured to insert the first subnet mark and the second subnet mark into the first service data to obtain the first mark data and the second mark data, and control the first mark data to be sent to the second field device (200) via a first network card of the first field device (100), and the second mark data to be sent to the second field device (200) via a second network card of the first field device (100);
the processing module of the second field device (200) is configured to control receiving the first tag data via a first network card of the second field device (200), receiving the second tag data via a second network card of the second field device (200), and removing a subnet tag of data received first in the first tag data and the second tag data to obtain the first service data.
6. The industrial network communication system according to claim 1, wherein the control center (700) comprises a first monitoring device (701) and a second monitoring device (702) that are redundant to each other, the industrial network communication system further comprising a first core switch (601) connected to the first monitoring device (701) and a second core switch (602) connected to the second monitoring device (702);
one of the two protocol conversion switches is connected to the first core switch (601), the other of the two protocol conversion switches is connected to the second core switch (602), and the first core switch (601) is in communication connection with the second core switch (602).
7. The industrial network communication system according to claim 1, wherein the first field device (100) is provided in plurality, and wherein a plurality of the first field devices (100) are connected to the first access switch (301A) and the second access switch (301B), respectively;
each of the plurality of first field devices (100) for inserting a first subnet mark and a second subnet mark into fourth traffic data to be transmitted to obtain seventh mark data and eighth mark data, and transmitting the seventh mark data to a target first field device (100) of the plurality of first field devices (100) via the first access switch (301A), and transmitting the second mark data to the target first field device via the second access switch (301B);
The target first field device (100) is configured to receive the seventh tag data and the eighth tag data, and remove a subnet tag of data received first in the seventh tag data and the eighth tag data to obtain the fourth service data.
8. An industrial network communication method is applicable to an industrial network communication system, and is characterized in that: the industrial network communication system includes: first and second field devices located within different virtual area networks, the first and second field devices being connected by first and second subnets in parallel; the first subnetwork comprises a first access switch, a third access switch and a first aggregation switch connected with the first access switch and the third access switch, wherein the first access switch and the third access switch are respectively connected to a first field device and a second field device; the second subnetwork comprises a second access switch, a fourth access switch and a second aggregation switch which are respectively redundant with the first access switch, the third access switch and the first aggregation switch; the method comprises the following steps:
Inserting a first subnet mark and a second subnet mark into first service data to be transmitted to obtain first mark data and second mark data, transmitting the first mark data to the second field device through the first access switch, the first convergence switch and the third access switch, and transmitting the second mark data to the second field device through the second access switch, the second convergence switch and the fourth access switch;
the second field device receives the first marking data and the second marking data, and removes a subnet marking of data received first in the first marking data and the second marking data to obtain the first service data;
wherein the industrial network communication system further comprises a control center and at least one protocol conversion switch; the first aggregation switch and the second aggregation switch are connected with the at least one protocol conversion switch; the method further comprises the steps of:
the first field device inserts the first subnet mark and the second subnet mark into second service data to be transmitted to obtain third mark data and fourth mark data, forwards the third mark data to the at least one protocol conversion switch through the first access switch and the first aggregation switch, and transmits the fourth mark data to the at least one protocol conversion switch through the second access switch and the second aggregation switch;
The at least one protocol conversion switch receives the third tag data and the fourth tag data, removes a network tag of data received first in the third tag data and the fourth tag data to obtain the second service data, and forwards the second service data to the control center;
and wherein the number of the at least one protocol conversion switch is two; and the two protocol conversion switches conduct real-time communication so that the protocol conversion switch which receives the third marking data and/or the fourth marking data later in the two protocol conversion switches discards the third marking data and/or the fourth marking data.
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