CN112187607B - System applied to communication expansion of control system - Google Patents
System applied to communication expansion of control system Download PDFInfo
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- CN112187607B CN112187607B CN202011124756.9A CN202011124756A CN112187607B CN 112187607 B CN112187607 B CN 112187607B CN 202011124756 A CN202011124756 A CN 202011124756A CN 112187607 B CN112187607 B CN 112187607B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/42—Loop networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/22—Arrangements for detecting or preventing errors in the information received using redundant apparatus to increase reliability
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/42—Loop networks
- H04L12/437—Ring fault isolation or reconfiguration
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/14—Two-way operation using the same type of signal, i.e. duplex
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/14—Two-way operation using the same type of signal, i.e. duplex
- H04L5/16—Half-duplex systems; Simplex/duplex switching; Transmission of break signals non-automatically inverting the direction of transmission
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Abstract
The invention discloses a system applied to communication expansion of a control system, which comprises a controller module, network nodes and communication links, wherein the controller module is connected with a plurality of network nodes in series through the communication links, and the network nodes at the tail end are connected with the controller module to form a ring network topology. The control system for redundant network communication realizes cascade connection of a plurality of expansion modules through a network interface, and enriches the functions of a controller system; the forwarding mode of the message cache can realize full duplex communication between the controller unit and the network expansion module; the message forwarding is supported in the storage process, and the message delay is small; the isolation between the redundant communication links enables the system to support ring-shaped network topology, and network switching equipment is not required to be added, so that the network layout is simpler and more reliable.
Description
The technical field is as follows:
the invention relates to a system applied to control system communication extension.
Background art:
in the field of industrial automation with high reliability requirements, the method adopts the modes of equipment redundancy and communication link redundancy, and improves the reliability of the whole system. Ethernet is an open, standardized local area network technology, and the IEEE802.3 ethernet technology standard, which specifies the physical medium, signal interface, and medium access layer protocols, is established by the IEEE organization. Physical layer chips (PHY) meeting different physical media and designed by various manufacturers according to the standard can meet different communication requirements of dozens of meters, kilometers or dozens of kilometers on an industrial common twisted pair and optical fiber, and meanwhile, a signal interface (MII) and a Medium Access Controller (MAC) are integrated into a current general micro-processor (MCU) with low cost, so that the Ethernet communication has the characteristics of simple realization, standardization of related devices, high reliability, various communication media, high communication speed and the like, and is widely applied to industrial control.
High-speed and good-compatibility communication mode Ethernet is a necessary choice, and redundant communication adopted in the aspect of high reliability is adopted, the currently adopted mode is to adopt a main MCU and a backup MCU to provide a redundant Ethernet controller and a communication link, and in addition, a standard two-layer Ethernet switching chip can also be adopted to realize the redundant communication. These solutions are based on the premise that the complexity of the system increases, and the degree of domestic productization of the two-layer ethernet switch chip is not high. The invention realizes that the network expansion mode with Ethernet physical layer exchange as the core has lower network delay through the programmable logic device, realizes the redundant communication network of the controller, and the network supports the ring-shaped network topology, reduces the network layout cost, and simultaneously supports more flexible network diagnosis and function configuration, thereby leading the network application to be more flexible.
The invention content is as follows:
the invention provides a system for controlling system communication expansion to solve the problems in the prior art, and the system realizes function expansion including redundant communication and ring network topology through standard Ethernet and supports half/full duplex communication.
The technical scheme adopted by the invention is as follows:
the system applied to communication expansion of the control system comprises a controller module, network nodes and communication links, wherein the controller module is connected with the network nodes in series through the communication links, and the network nodes at the tail end are connected with the controller module to form a ring network topology.
The network node comprises a first network expansion module and a second network expansion module which are redundant mutually, the communication link comprises a first communication link and a second communication link, the first network expansion module in the serially connected network node is connected through the first communication link, and the second network expansion module in the serially connected network node is connected through the second communication link.
Furthermore, the controller module comprises a master controller module and a slave controller module, two first network expansion modules at head and tail positions in the plurality of serially connected network nodes are correspondingly connected with the master controller module and the slave controller module through first communication links, and two second network expansion modules at head and tail positions are correspondingly connected with the master controller module and the slave controller module through second communication links.
Further, the master controller module and the slave controller module each include a first MCU processor, a first logic control unit, a first PHY, a first network interface, a second PHY, and a second network interface, the first MCU processor is connected to the first logic control unit, the first logic control unit expands the first PHY and the second PHY, the first network interface and the second network interface are correspondingly connected to the first PHY and the second PHY, the first PHY expanded by the first logic control unit and the first network interface are connected to a first communication link in the communication link, and the second PHY expanded by the first logic control unit and the second network interface are connected to a second communication link in the communication link; the first PHY and the first network interface expanded by the first logic control unit are isolated from the second PHY and the second network interface.
Further, the first MCU processor includes a MAC controller, the MAC controller provides a first MII interface and a configuration diagnosis interface to the outside, the first logic control unit provides 3 second MII interfaces, the 3 second MII interfaces are respectively used to connect the first MII interface, the first PHY and the second PHY, and the configuration diagnosis interface is connected to the first logic control unit and is used for function configuration and diagnosis data reading of the first logic control unit.
Furthermore, the first logic control unit comprises a message cache module, a message exchange module, a message filtering module and a memory with network diagnosis and configuration functions, the first logic control unit provides 3 second MII interfaces to the outside, the message exchange module realizes the Ethernet message exchange function of three ports, respectively forwards the data of the first MCU processor to the first communication link and the second communication link, meanwhile, the data of the first communication link and the second communication link are forwarded to the MCU processor, the message filtering module acquires the interface data of the first communication link and the interface data of the second communication link and filters illegal messages in the first communication link and the second communication link, and writing the obtained illegal message information into a memory, reading the data of the memory by the first MCU processor, and caching the data of the first MCU processor, the first communication link and the second communication link by the message caching module.
Further, the first network expansion module is connected to the first communication link, the second network expansion module is connected to the second communication link, and both the first network expansion module and the second network expansion module include a second MCU processor, a second logic control unit, a third PHY, a third network interface, a fourth PHY, and a fourth network interface, where the third network interface and the fourth network interface are connected to the first communication link or the second communication link; the communication between the third PHY and the third network interface expanded by the second logic control unit and the communication between the fourth PHY and the fourth network interface are not isolated; the second MCU processor and the second logic control unit have the same modules and interfaces with the first MCU processor and the first logic control unit, and are connected through the corresponding MII interface and the configuration diagnosis interface.
The redundant communication link provided by the invention is a redundant ring topology structure, and the redundant communication in the scheme comprises controller redundancy, network expansion module redundancy and communication link redundancy. Wherein the controller redundancy comprises a master controller module and a slave controller module. After the master controller is connected with the redundant first network expansion modules of all the network expansion modules in series through the first communication link in the communication link redundancy, the master controller is connected to the slave controller module in a ring mode at the last first network expansion module. Meanwhile, after the master controller is connected with all the redundant second network expansion modules of the network expansion modules in series through the second communication link in the communication link redundancy, the slave controller module is annularly connected to the last second network expansion module. The device redundancy and the link redundancy of a control system communication expansion mode are realized, the ring-shaped communication mode modifies the star topology of the Ethernet into the ring topology, and the complexity of network layout is reduced. The first communication link and the second communication link in the ring topology are completely isolated independent networks, so that the network collision probability is reduced, and the communication rate is improved. The beneficial effects produced by the method are as follows:
1) the invention realizes the function expansion of the whole controller network by the cascade connection of the controller and the network expansion module.
2) The invention includes redundancy of equipment and redundancy of communication links. The equipment redundancy comprises a redundant controller module and a redundant network expansion module, and simultaneously comprises a redundant communication link for cascading the redundant controller module and the redundant network expansion module, so that the reliability of the whole controller system is improved.
3) The system structure is simplified, the device integration level is high, less logic resource consumption is realized, and the cost advantage is higher.
4) The message is based on a store-and-forward mode, allows the nodes to receive data simultaneously when sending data, and realizes half/full duplex communication of the redundant communication network.
5) The message exchange module of the physical layer realizes smaller network communication delay.
6) The star topology of the Ethernet is modified into a ring topology, and the complexity of network layout is reduced.
7) The isolation between redundant networks reduces the probability of network conflict and improves the communication rate.
Description of the drawings:
fig. 1 is a topology of the present invention.
Fig. 2 is an overall block diagram of the present invention.
Fig. 3 is an internal functional diagram of the controller module of the present invention.
Fig. 4 is an internal functional diagram of the network expansion module of the present invention.
Fig. 5 is a connection diagram of the MCU and the logic control unit in the controller module and the network expansion module according to the present invention.
The specific implementation mode is as follows:
the invention will be further described with reference to the accompanying drawings.
The system applied to the communication expansion of the control system can be applied to the occasions of industrial automation controllers with high reliability requirements, short communication controller period and higher real-time requirements. The reliability of the whole system is improved through equipment redundancy and link redundancy, the requirements of short period communication and high real-time requirement of industrial automation control can be met by adopting hundred-mega Ethernet communication, and higher controller precision can be achieved. On the other hand, the number of external interfaces of the controller is limited, more network expansion modules are cascaded through the network interfaces, the functions of the controller are enriched, and the complexity of system application is reduced due to the ring-shaped network topology.
As shown in fig. 1, the present invention includes a controller module 2, a network node 3, and a redundant communication link 4 connecting the controller module 2 and the network node 3.
The controller module 2 and a plurality of network nodes are connected through a redundant communication link 4, and the expansion of the functions of the control system is realized. The redundant communication links 4 are of a ring topology and the controller module 2 provides a network interface for communication in the redundant communication links 4 that connects all of the network nodes 3 in series and returns to the controller module 2 at the last network node 3.
With reference to fig. 2, the network node 3 comprises two mutually redundant first and second network expansion modules 31, 32, the communication link 4 comprises a first communication link 41 and a second communication link 42, the first network expansion module 31 of the serially connected network nodes 3 is connected via the first communication link 41, and the second network expansion module 32 of the serially connected network nodes 3 is connected via the second communication link 42.
The controller module 2 includes a master controller module 21 and a slave controller module 22. The controller module 2 includes two network interfaces, which are respectively connected to the first communication link 41 and the second communication link 42 to form redundant communication. The first communication link 41 and the second communication link 42 cannot communicate with each other, and constitute two communication links isolated from each other.
Two first network expansion modules 31 at the head and tail positions in the plurality of serially connected network nodes 3 are correspondingly connected with the master controller module 21 and the slave controller module 22 through first communication links 41, and two second network expansion modules 32 at the head and tail positions are correspondingly connected with the master controller module 21 and the slave controller module 22 through second communication links 42.
The network node 3 is connected to two independent redundant first network expansion modules 31 and two independent redundant second network expansion modules 32 at a redundant communication link 4, each network expansion module comprises two network interfaces, and the two network interfaces are not isolated and can communicate with each other. The network interface on each network expansion module is for cascading network expansions on the corresponding communication link.
As shown in fig. 3 (fig. 3 takes the master controller module 21 as an example), the master controller module 21 and the slave controller module 22 in the present invention each include a first MCU processor 211, a first logic control unit 212, a first PHY213 (PHY is a physical layer), a first network interface 214, a second PHY215, and a second network interface 216.
The first MCU processor 211 is connected to the first logic control unit 212, the first logic control unit 212 extends the first PHY213 and the second PHY215, the first network interface 214 and the second network interface 216 are respectively connected to the first PHY213 and the second PHY215, the first PHY213 and the first network interface 214 extended by the first logic control unit 212 are connected to the first communication link 41 in the communication link, and the second PHY215 and the second network interface 216 extended by the first logic control unit 212 are connected to the second communication link 42 in the communication link; the first PHY213 and the first network interface 214 extended by the first logic control unit 212 are isolated from the second PHY215 and the second network interface 216.
The first MCU processor 211 includes a MAC controller 2111, the MAC controller 2111 provides a first MII interface 2112 and a configuration diagnostic interface 2113, the MAC controller 2111 provides 3 second MII interfaces 217 to the outside, the 3 second MII interfaces 217 are respectively used for connecting the first MII interface 2112, the first PHY213 and the second PHY215, and the configuration diagnostic interface 2113 is connected to the first logic control unit 212 and used for function configuration and diagnostic data reading of the first logic control unit 212.
The first network expansion module 31 is connected to the first communication link 41, the second network expansion module 32 is connected to the second communication link 42, and the first network expansion module 31 and the second network expansion module 32 have similar structures to the main controller module 21, and each include a second MCU processor 311, a second logic control unit 312, a third PHY313, a third network interface 314, a fourth PHY315, and a fourth network interface 316. The third network interface 314 and the fourth network interface 316 are commonly connected to the first communication link 41 or the second communication link 42 (fig. 4 illustrates the first network expansion module). Unlike the main controller module 21, the third PHY313 and the third network interface 314 extended by the second logic control unit 312 are not isolated from the fourth PHY315 and the fourth network interface 316; the second MCU processor 311 and the second logic control unit 312 have the same modules and interfaces as the first MCU processor 211 and the first logic control unit 212, and the second MCU processor 311 and the second logic control unit 312 are connected via corresponding MII interfaces and configuration diagnosis interfaces.
As shown in fig. 5, logic control units (i.e., corresponding first logic control unit 212 and second logic control unit 312) are disposed in the master controller module 21, the slave controller module 22, the first network expansion module 31, and the second network expansion module 32.
Taking the first logic control unit 212 as an example (fig. 5), the first logic control unit 212 includes a memory 2124 with network diagnosis and configuration functions, the first MCU processor 211 writes configuration data into the first logic control unit 212 according to the difference between the functions of the controller module 2 and the network node 3, and the first MCU processor 211 reads the diagnosis data in the first logic control unit 212.
The first logic controller unit 212 further includes a message filtering module 2123, a message caching module 2121, a message switching module 2122, and 3 second MII interfaces 217 for connecting the first MCU processor 211, the first network interface 214, and the second network interface 216, respectively.
The message filtering module 2123 obtains interface data of the first communication link 42 and interface data of the second communication link 41, filters illegal messages in the first communication link 42 and the second communication link 41, including messages with too long or too short messages and frame intervals that are not consistent, and writes the obtained illegal message information into the memory 2124 of the network diagnosis and configuration function, and the first MCU processor 211 can read the memory data.
The message buffer module 2121 is configured to store data that is received and transmitted by the first MCU processor 211 through the first MII interface 2112, and the filtered data of the first communication link 42 and the filtered data of the second communication link 41. The message buffer module 2121 is configured to store data in the first MCU processor 211, the first communication link 42, and the second communication link 41, so that network switching is based on a store-and-forward mode, and thus the first MCU processor 211, the first communication link 42, and the second communication link 41 receive data simultaneously when transmitting data, thereby implementing full-duplex communication of a redundant communication network. In addition, the store-and-forward module 2121 supports forwarding the packet during the storing process, so as to minimize the delay of the packet.
The message switching module 2122 is a three-port network switching unit, and is connected to the first MCU processor 211 data cache, the first communication link data cache, and the second communication link data cache, respectively, and the message switching module 2122 forwards the message to other ports except its own port in a time division manner. Wherein the redundant communication links isolated in the controller module 2 are implemented by the first MCU processor 211 configuring the message exchange module 2122 through the configuration diagnostic interface 2113. In the network node 3, the two network interfaces are not isolated, and the first MCU processor 211 configures the message switching module 2122 through the configuration diagnosis interface 2113.
The foregoing is only a preferred embodiment of this invention and it should be noted that modifications can be made by those skilled in the art without departing from the principle of the invention and these modifications should also be considered as the protection scope of the invention.
Claims (5)
1. A system for controlling system communication extensions, comprising: the network node system comprises a controller module (2), network nodes (3) and communication links (4), wherein the controller module (2) is connected with a plurality of network nodes (3) in series through the communication links (4), and the network nodes (3) at the tail end are connected with the controller module (2) to form a ring network topology; the network node (3) comprises a first network expansion module (31) and a second network expansion module (32) which are redundant to each other, the communication link (4) comprises a first communication link (41) and a second communication link (42), the first network expansion module (31) in the serially connected network nodes (3) is connected through the first communication link (41), and the second network expansion module (32) in the serially connected network nodes (3) is connected through the second communication link (42);
the controller module (2) comprises a master controller module (21) and a slave controller module (22), two first network expansion modules (31) at head and tail positions in a plurality of serially connected network nodes (3) are correspondingly connected with the master controller module (21) and the slave controller module (22) through first communication links (41), and two second network expansion modules (32) at head and tail positions are correspondingly connected with the master controller module (21) and the slave controller module (22) through second communication links (42).
2. The system for controlling system communication extensions of claim 1, wherein: the master controller module (21) and the slave controller module (22) each comprise a first MCU processor (211), a first logic control unit (212), a first PHY (213), a first network interface (214), a second PHY (215), and a second network interface (216), the first MCU processor (211) is connected with a first logic control unit (212), the first logic control unit (212) expands a first PHY (213) and a second PHY (215), a first network interface (214) and a second network interface (216) are correspondingly connected with the first PHY (213) and the second PHY (215) respectively, the first PHY (213) and the first network interface (214) expanded by the first logic control unit (212) are connected with a first communication link (41) in the communication link, and the second PHY (215) and the second network interface (216) expanded by the first logic control unit (212) are connected with a second communication link (42) in the communication link; the first PHY (213) and the first network interface (214) of the first logic control unit (212) are expanded to be isolated from the second PHY (215) and the second network interface (216).
3. The system for controlling system communication extensions of claim 2, wherein: the first MCU processor (211) comprises a MAC controller (2111), the MAC controller (2111) provides a first MII interface (2112) and a configuration diagnosis interface (2113) for the outside, the first logic control unit (212) provides 3 second MII interfaces (217), the 3 second MII interfaces (217) are respectively used for connecting the first MII interface (2112), the first PHY (213) and the second PHY (215), and the configuration diagnosis interface (2113) is connected with the first logic control unit (212) and used for function configuration and diagnosis data reading of the first logic control unit (212).
4. A system for controlling system communication extensions according to claim 3 further comprising: the first logic control unit (212) comprises a message buffer module (2121), a message exchange module (2122), a message filtering module (2123) and a memory (2124) with network diagnosis and configuration functions, the first logic control unit (212) is externally provided with 3 second MII interfaces (217), the message exchange module (2122) realizes the Ethernet message exchange function of three ports, respectively forwards the data of the first MCU processor (211) to the first communication link (41) and the second communication link (42), and simultaneously forwards the data of the first communication link (41) and the second communication link (42) to the MCU processor (211), the message filtering module (2123) acquires the interface data of the first communication link (41) and the interface data of the second communication link (42), and filters illegal messages in the first communication link (41) and the second communication link (42), and writing the obtained illegal message information into a memory (2124), reading the memory data by the first MCU processor (211), and caching the data by the message caching module (2121) for the first MCU processor (211), the first communication link (41) and the second communication link (42).
5. The system for controlling system communication extensions of claim 1, wherein: the first network expansion module (31) is connected with a first communication link (41), the second network expansion module (32) is connected with a second communication link (42), the first network expansion module (31) and the second network expansion module (32) both comprise a second MCU processor (311), a second logic control unit (312), a third PHY (313), a third network interface (314), a fourth PHY (315) and a fourth network interface (316), and the third network interface (314) and the fourth network interface (316) are connected with the first communication link (41) or the second communication link (42) together; the third PHY (313) and the third network interface (314) extended by the second logic control unit (312) are not isolated from the fourth PHY (315) and the fourth network interface (316) in communication; the second MCU processor (311) and the second logic control unit (312) have the same modules and interfaces with the first MCU processor (211) and the first logic control unit (212), and the second MCU processor (311) and the second logic control unit (312) are connected through corresponding MII interfaces and configuration diagnosis interfaces.
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