CN112511397B - Self-healing method of EPA (Ethernet for plant Automation) annular network - Google Patents
Self-healing method of EPA (Ethernet for plant Automation) annular network Download PDFInfo
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Abstract
A self-healing method of an EPA ring network comprises the following steps: the main station equipment sends a management message in an EPA annular network; each slave station device receives the management message and reports the sequence position of the slave station device in the ring network in the management message; the slave station equipment detects whether the sequence position of the slave station equipment in the ring network changes or not based on the management message sent by the master station equipment; if the sequence position changes, each slave station device carries out corresponding clock synchronization and communication according to the sequence position change; and the master station equipment judges whether the number of the slave station equipment in the ring network changes or not according to the received management message, and if so, the master station equipment sequentially initiates all the slave station equipment to re-measure the network delay time and adjusts the sequence of the slave station equipment in the network. The network state is diagnosed by monitoring the number of the slave station devices in the network through the master station device and monitoring the position numbers of each slave station device in the network nodes, whether the slave station devices are on line or off line can be diagnosed, and then network self-healing is carried out according to the node change conditions.
Description
Technical Field
The invention relates to the technical field of real-time industrial Ethernet, in particular to a self-healing method of an EPA (Ethernet for plant automation) ring network.
Background
A ring network is a network that uses a continuous ring to connect each device together. It can ensure that a signal transmitted on one device can be received by all other devices on the ring. As a mature network topology structure, the ring network has the advantages of low cost, high reliability, high transmission rate, simple networking and the like, and is gradually applied to the field of industrial control. But the nodes of the ring network go down to cause a full network failure and the failure detection is difficult. When communication is performed based on a ring network, how to avoid logical looping on a physical loop and how to construct a fast failure detection mechanism have been the focus of research. The ethernet ring network generally adopts the ethernet ring detection technology of the spanning tree protocol STP and the ethernet ring protection switching protocol ERPS. However, the algorithm of the STP protocol is complicated and has a very long convergence time, and the convergence time is increased with the increase of the network. Furthermore, STP cannot be implemented to locate the ring points. STP is mainly suitable for Ethernet LAN with low requirement for reliability and less node number. The ERPS is essentially a loop protection switching technology, is very suitable for a known ethernet loop topology, and can perform protection switching by using a redundant path in a loop to improve the reliability of a network, but under the condition that a looping point cannot be known in advance, the ERPS cannot be set and is difficult to protect, and the ERPS is only suitable for protecting the known loop or the ethernet network with the loop topology determined in advance. The two loop detection technologies cannot realize fault detection and self-healing of the industrial Ethernet EPA annular network.
Disclosure of Invention
In order to solve the above problems, the present application provides a self-healing method for an EPA ring network, which diagnoses a network state based on an EPA ring network device having a node automatic bypass function by monitoring the number of devices in the network by a master device and monitoring the position number of each device in a network node, and can diagnose whether a device is online or offline, and then perform network self-healing according to the node change condition.
The technical scheme of the invention is as follows:
the invention provides a self-healing method of an EPA (Ethernet for plant automation) annular network, wherein the EPA annular network comprises a master station device and a plurality of slave station devices, each network node in the EPA annular network is respectively provided with an automatic bypass, a communication mechanism of the EPA annular network is divided into real-time periodic data communication, real-time aperiodic data communication and non-real-time data communication, the real-time periodic data communication and the real-time aperiodic data communication respectively adopt an exclusive communication mechanism, the non-real-time data communication adopts a full-network concurrent communication mechanism, and the self-healing method comprises the following steps:
the main station equipment sends a management message in an EPA annular network;
each slave station device receives the management message and reports the sequence position of the slave station device in the ring network in the management message;
the slave station equipment detects whether the sequence position of the slave station equipment in the ring network changes or not based on the management message sent by the master station equipment;
if the sequence position changes, each slave station device carries out corresponding clock synchronization and communication according to the sequence position change;
the master station device judges whether the number of the slave station devices in the ring network changes or not according to the received management message,
and if the network delay time changes, the master station equipment sequentially initiates all the slave station equipment to measure the network delay time again, and adjusts the sequence of the slave station equipment in the network.
Further preferably, when a single slave station device in the ring network goes offline, each slave station device performs corresponding clock synchronization and communication according to a change of the sequential position, specifically including: when a single slave device goes offline, all the online slave devices perform clock synchronization and co-communication.
Further preferably, when at least two slave station devices in the ring network are offline simultaneously, each slave station device performs corresponding clock synchronization and communication according to a change of the sequential position, specifically including:
dividing the ring network into a first interval and a second interval, wherein the first interval is an interval containing the master station equipment between two slave station equipment which are off-line simultaneously, and the second interval is an interval not containing the master station equipment between the two slave station equipment which are off-line simultaneously;
and the slave station equipment in the first interval performs clock synchronization and communication, and the slave station equipment in the second interval does not perform clock synchronization and only receives, forwards and closes the real-time message.
Further preferably, when at least two slave devices in the ring network go offline simultaneously, the slave devices in the second interval have a receiving and forwarding function and no transmitting function in a real-time period and a real-time non-period, respectively.
Further preferably, when a single slave station device in the ring network comes online, each slave station device performs corresponding clock synchronization and communication according to a change of the sequential position, specifically including:
all the original online slave station equipment carries out clock synchronization and communication;
the on-line slave station equipment sends an on-line request to the master station equipment in a non-real-time message time slice;
the master station equipment judges whether the slave station equipment on line has a reserved time slice and whether the reserved time slice meets the requirement or not according to the received on-line request;
if the slave station equipment which is on line is judged to be provided with the reserved time slice and meets the requirement, the macro-cycle configuration is unchanged;
and if the slave station equipment which is on line is judged to have no reserved time slice or can not meet the requirement, the macro cycle is reconfigured, and all the slave station equipment carries out scheduling according to the reconfigured macro cycle.
It is further preferable that, when a single slave device is on line in the ring network, the on-line slave device has a receiving, forwarding and transmitting function in a non-real-time period, and has a receiving and forwarding function in a real-time non-periodic and real-time period, and has no transmitting function.
It is further preferred that the first and second liquid crystal compositions,
according to the first aspect, when at least two slave station devices simultaneously come online in the ring network, each slave station device performs corresponding clock synchronization and communication according to a change of a sequential position, specifically including:
dividing a ring network into a first interval and a second interval, wherein the first interval is an interval containing a master station device between two slave station devices which are on-line simultaneously, and the second interval is an interval not containing the master station device between the two slave station devices which are on-line simultaneously;
the slave station equipment in the first interval carries out clock synchronization and communication, and the slave station equipment in the second interval does not carry out clock synchronization and only receives, forwards and closes the real-time message;
the on-line slave station equipment sends an on-line request to the master station equipment in a non-real-time message time slice;
the master station equipment judges whether the slave station equipment on line has a reserved time slice and whether the reserved time slice meets the requirement or not according to the received on-line request;
if the slave station equipment which is on line is judged to be provided with the reserved time slice and meets the requirement, the macro-cycle configuration is unchanged;
and if the slave station equipment which is on line is judged to have no reserved time slice or can not meet the requirement, the macro cycle is reconfigured, and all the slave station equipment carries out scheduling according to the reconfigured macro cycle.
Further preferably, when at least two slave station devices in the ring network are simultaneously on-line, the on-line slave station device and the slave station device in the second interval have receiving, forwarding and transmitting functions in a non-real-time period, and have receiving and forwarding functions in a real-time non-real-time period and a real-time period, but do not have a transmitting function.
According to the self-healing method of the EPA annular network, based on the EPA ring network equipment with the node automatic bypass function, the network state is diagnosed by monitoring the number of the slave station equipment in the network through the master station equipment and monitoring the position number of each slave station equipment in the network node, whether the slave station equipment is on line or off line can be diagnosed, and then the network self-healing is carried out according to the node change condition. The method has the advantages of high fault detection speed, high reliability, high network self-healing speed and the like.
Drawings
FIG. 1 is a schematic diagram of bypass hardware;
FIG. 2 is a communication mechanism of EPA ring network macrocycle;
FIG. 3 is a diagram of macrocycle time slice division;
FIG. 4 is a flow chart of a EPA ring network self-healing process;
fig. 5 is a schematic diagram of EPA ring network clock synchronization.
Detailed Description
The present invention will be described in further detail with reference to the following detailed description and accompanying drawings.
The EPA network hardware equipment adopts an equipment power-down bypass function, when one or more pieces of equipment in the ring network are powered down, the power-down equipment can automatically start a bypass of the equipment so as to ensure that the physical layer of the ring network is normally connected, for the network, only the number of nodes of the network is changed, and the hardware bypass is shown in figure 1.
As can be seen from fig. 1, the EPA ring network includes a master device and several slave devices, and each network node in the EPA ring network is configured with an automatic bypass.
The communication mechanism of the EPA ring network is divided into real-time periodic data communication, real-time non-periodic data communication, non-real-time data communication, i.e. dividing the macrocycle into three time slices, as shown in fig. 2 and 3. Both the real-time periodic data communication and the real-time non-periodic data communication adopt an exclusive communication mechanism, namely when a certain device sends a time slice, the device can exclusively use the whole network for data transmission. The time slice division and the sending sequence of the real-time periodic data can be configured; the method comprises the steps that real-time non-periodic data are applied for time slices from slave station equipment to master station equipment, the master station equipment is distributed in a coordinated mode, and the slave station equipment sends data after obtaining the time slices; when the non-real-time data time slice is sent, all the ring network node devices can simultaneously and parallelly transmit data. The various types of data transmission characteristics in the EPA ring network are shown in table 1.
TABLE 1 Transmission characteristics of various types of data
Based on the above-described EPA ring network with node automatic bypass function, the present application provides a self-healing method for an EPA ring network, where a flowchart thereof is shown in fig. 4, and specifically includes the following steps.
S100: the master station device sends a management message in the EPA ring network.
S200: and each slave station device receives the management message and reports the sequential position of the slave station device in the ring network in the management message.
S300: and the slave station equipment detects whether the sequence position of the slave station equipment in the ring network changes or not based on the management message sent by the master station equipment.
S400: if the sequence position changes, the slave station devices carry out corresponding clock synchronization and communication according to the sequence position change.
S500: and the master station equipment judges whether the number of the slave station equipment in the ring network changes or not according to the received management message.
S600: and if the network delay time changes, the master station equipment sequentially initiates all the slave station equipment to measure the network delay time again, and adjusts the sequence of the slave station equipment in the network.
In the technical solutions provided in the above steps S100-S600, the network device offline monitoring is based on that the management message sent by the master station device includes device count information, and when the management message finally returns to the master station device, the master station device can find whether the network increases/decreases devices, and can determine the specific changed position through the report position sequence change message of the slave station device. At the beginning of the establishment of the EPA network, each slave device already knows the sequential position of its own transmission in the ring network, and therefore, the slave device can determine whether its own position has changed according to the device information in the management message sent by the master device. If the clock synchronization message received by the port is changed, the clock synchronization message is not used for clock synchronization calculation.
When the slave station device finds that the position of the slave station device in one direction in the ring network changes, the slave station device selects the clock synchronization message of the correct port in the other direction to synchronize, so that the influence of the device on the up-down line on the slave station device is avoided. If the positions of the two directions are changed, the slave station equipment stops sending the real-time message and only receives and forwards the real-time message, determines a non-real-time slice by monitoring the non-real-time message and can send the non-real-time message. Fig. 5 is a schematic diagram of clock synchronization of the EPA ring network, where DTCn and DTWn are line delay times for clockwise and counterclockwise transmissions between device Nn and master N0, respectively.
The following describes specific situations of online and offline of devices in the EPA ring network.
As shown in table 2 below, when a single slave device in the EPA ring network goes offline, each slave device performs corresponding clock synchronization and communication according to the change of the sequential position, which specifically includes: when a single slave device goes offline, all the online slave devices perform clock synchronization and co-communication.
TABLE 2 Single Equipment Down (bypass) case
As shown in table 2 above, when a single device goes down (bypass), the clock synchronization and communication scheduling mechanism of each device in the EPA-XRT network works as follows: when a single device is offline, all online devices can find the correct path of clock synchronization, and can correctly synchronize and communicate. Meanwhile, when the master station monitors that the number of the network devices changes, the master station device sequentially initiates all the slave station devices to re-measure the network delay time (time slices are distributed in a real-time non-periodic manner), and adjusts the sequence of the slave station devices in the network, and the synchronization process does not affect the normal communication of the network.
As shown in table 3 below, when at least two slave station devices in the ring network go offline simultaneously, each slave station device performs corresponding clock synchronization and communication according to the change of the sequential position, which specifically includes:
dividing the ring network into a first interval and a second interval, wherein the first interval is an interval containing the master station equipment between two slave station equipment which are off-line simultaneously, and the second interval is an interval not containing the master station equipment between the two slave station equipment which are off-line simultaneously;
and the slave station equipment in the first interval performs clock synchronization and communication, and the slave station equipment in the second interval does not perform clock synchronization and only receives, forwards and closes the real-time message.
TABLE 3 Simultaneous two-device offline (bypass) case
As shown in table 3 above, when two devices are offline (bypassed) simultaneously, the clock synchronization and communication scheduling mechanism of each device in the EPA-XRT network works as follows: when two devices get off the line, the ring network is divided into two intervals, one is an interval between the two off-line devices and containing the main station device, and the other is an interval between the two off-line devices and not containing the main station device. The devices in the first zone can synchronize and communicate properly. The equipment in the second interval cannot be synchronized correctly, the communication only supports receiving and forwarding, and the real-time message sending function is closed. Meanwhile, when the master station monitors that the number of the network devices changes, the master station device sequentially initiates all the slave station devices to re-measure the network delay time (time slices are distributed in a real-time non-periodic manner), and adjusts the sequence of the slave station devices in the network, so that the whole network is recovered to be normal.
When more than two devices are off-line (bypass) at the same time, the processing method is similar to that of the two devices. When a plurality of devices are sequentially offline (bypassed), the processing method is similar to that of the offline (bypassed) single device.
As shown in table 4 below, when a single slave device in the ring network comes online, each slave device performs corresponding clock synchronization and communication according to a change of the sequential position, which specifically includes:
all the original online slave station equipment carries out clock synchronization and communication;
the on-line slave station equipment sends an on-line request to the master station equipment in a non-real-time message time slice;
the master station equipment judges whether the slave station equipment on line has a reserved time slice and whether the reserved time slice meets the requirement or not according to the received on-line request;
if the slave station equipment which is on line is judged to be provided with the reserved time slice and meets the requirement, the macro-cycle configuration is unchanged;
and if the slave station equipment which is on line is judged to have no reserved time slice or can not meet the requirement, the macro cycle is reconfigured, and all the slave station equipment carries out scheduling according to the reconfigured macro cycle.
TABLE 4 Single device on-line conditions
As shown in table 4 above, when a single device is online, the clock synchronization and communication scheduling mechanism of each device in the EPA-XRT network works as follows: when a single device is on line, all original on-line devices can find the correct path of clock synchronization, and correct synchronization and communication can be realized. The new online equipment reports the online requirement to the main station equipment in the non-real-time message time slice, and simultaneously supports the receiving and forwarding of the message. After the master station receives the online requirement of the new online device, the master station device judges that the macrocycle configuration is unchanged and the communication of other original devices is not influenced if the online device has a reserved time slice and meets the requirement; and if the online equipment does not reserve the time slice or cannot meet the requirement, the macrocycle configuration is reconfigured, and all the equipment is scheduled again according to the new configuration. And after the network delay time is measured again by each slave station device, the network returns to normal.
As shown in table 5 below, when at least two slave station devices in the ring network simultaneously come on line, each slave station device performs corresponding clock synchronization and communication according to the change of the sequential position, which specifically includes:
dividing a ring network into a first interval and a second interval, wherein the first interval is an interval containing a master station device between two slave station devices which are on-line simultaneously, and the second interval is an interval not containing the master station device between the two slave station devices which are on-line simultaneously;
the slave station equipment in the first interval carries out clock synchronization and communication, and the slave station equipment in the second interval does not carry out clock synchronization and only receives, forwards and closes the real-time message;
the on-line slave station equipment sends an on-line request to the master station equipment in a non-real-time message time slice;
the master station equipment judges whether the slave station equipment on line has a reserved time slice and whether the reserved time slice meets the requirement or not according to the received on-line request;
if the slave station equipment which is on line is judged to be provided with the reserved time slice and meets the requirement, the macro-cycle configuration is unchanged;
and if the slave station equipment which is on line is judged to have no reserved time slice or can not meet the requirement, the macro cycle is reconfigured, and all the slave station equipment carries out scheduling according to the reconfigured macro cycle.
TABLE 5 two devices on line
As shown in table 5 above, when two devices are online, the clock synchronization and communication scheduling mechanism of each device in the EPA-XRT network works as follows: when two devices are on line, the ring network is divided into two intervals, one interval is an interval between the two devices on line and contains the main station device, and the other interval is an interval between the two devices on line and does not contain the main station device. The devices in the first zone can synchronize and communicate properly. The equipment in the second interval cannot be synchronized correctly, the communication only supports receiving and forwarding, and the real-time message sending function is closed. After the master station receives the online requirement of the new online device, the master station device judges that the macrocycle configuration is unchanged and the communication of other original devices is not influenced if the online device has a reserved time slice and meets the requirement; and if the online equipment does not reserve the time slice or cannot meet the requirement, the macrocycle configuration is reconfigured, and all the equipment is scheduled again according to the new configuration. And after the network delay time is measured again by each slave station device, the network returns to normal.
When more than two devices are on-line simultaneously, the processing method is similar to the on-line of the two devices. When a plurality of devices are on-line in sequence, the processing method is similar to the on-line processing of a single device.
By the technical scheme provided by the application, when a single device or a plurality of devices are simultaneously/sequentially offline (bypassed)/online, the EPA annular network can be recovered to be normal. The EPA annular network has a network self-healing function, and the EPA annular network can not influence the clock synchronization precision and further influence the scheduling transmission mechanism of the EPA network when the ring network equipment is off-line (bypass)/on-line due to fault maintenance, equipment maintenance and the like.
The present invention has been described in terms of specific examples, which are provided to aid understanding of the invention and are not intended to be limiting. For a person skilled in the art to which the invention pertains, several simple deductions, modifications or substitutions may be made according to the idea of the invention.
Claims (8)
1. A self-healing method of an EPA annular network is characterized in that the EPA annular network comprises a master station device and a plurality of slave station devices, each network node in the EPA annular network is respectively provided with an automatic bypass, a communication mechanism of the EPA annular network is divided into real-time periodic data communication, real-time aperiodic data communication and non-real-time data communication, the real-time periodic data communication and the real-time aperiodic data communication respectively adopt an exclusive communication mechanism, the non-real-time data communication adopts a full-network concurrent communication mechanism, and the self-healing method comprises the following steps:
the main station equipment sends a management message in an EPA annular network;
each slave station device receives the management message and reports the sequence position of the slave station device in the ring network in the management message;
the slave station equipment detects whether the sequence position of the slave station equipment in the ring network changes or not based on the management message sent by the master station equipment;
if the sequence position changes, each slave station device carries out corresponding clock synchronization and communication according to the sequence position change;
the master station device judges whether the number of the slave station devices in the ring network changes or not according to the received management message,
and if the network delay time changes, the master station equipment sequentially initiates all the slave station equipment to measure the network delay time again, and adjusts the sequence of the slave station equipment in the network.
2. A self-healing method according to claim 1, wherein when a single slave device in the ring network goes off-line, each slave device performs corresponding clock synchronization and communication according to a change of sequential position, specifically comprising: when a single slave device goes offline, all the online slave devices perform clock synchronization and co-communication.
3. A self-healing method according to claim 1, wherein when at least two slave devices in the ring network go offline simultaneously, each slave device performs corresponding clock synchronization and communication according to a change of sequential position, specifically comprising:
dividing the ring network into a first interval and a second interval, wherein the first interval is an interval containing the master station equipment between two slave station equipment which are off-line simultaneously, and the second interval is an interval not containing the master station equipment between the two slave station equipment which are off-line simultaneously;
and the slave station equipment in the first interval performs clock synchronization and communication, and the slave station equipment in the second interval does not perform clock synchronization and only receives, forwards and closes the real-time message.
4. A self-healing method according to claim 3, wherein when at least two slave devices in the ring network go offline simultaneously, the slave devices in the second interval have a receiving and forwarding function and no transmitting function in a real-time period and a real-time aperiodic period, respectively.
5. A self-healing method according to claim 1, wherein when a single slave device in the ring network comes online, each slave device performs corresponding clock synchronization and communication according to a change of sequential position, and specifically includes:
all the original online slave station equipment carries out clock synchronization and communication;
the on-line slave station equipment sends an on-line request to the master station equipment in a non-real-time message time slice;
the master station equipment judges whether the slave station equipment on line has a reserved time slice and whether the reserved time slice meets the requirement or not according to the received on-line request;
if the slave station equipment which is on line is judged to be provided with the reserved time slice and meets the requirement, the macro-cycle configuration is unchanged;
and if the slave station equipment which is on line is judged to have no reserved time slice or can not meet the requirement, the macro cycle is reconfigured, and all the slave station equipment carries out scheduling according to the reconfigured macro cycle.
6. A self-healing method according to claim 5, wherein when a single slave device is on-line in the ring network, the on-line slave device has a receiving, forwarding and transmitting function in a non-real time period, and has a receiving and forwarding function and no transmitting function in a real time non-periodic and real time period.
7. A self-healing method according to claim 1, wherein when at least two slave devices in the ring network come on line simultaneously, each slave device performs corresponding clock synchronization and communication according to a change of sequential position, specifically comprising:
dividing a ring network into a first interval and a second interval, wherein the first interval is an interval containing a master station device between two slave station devices which are on-line simultaneously, and the second interval is an interval not containing the master station device between the two slave station devices which are on-line simultaneously;
the slave station equipment in the first interval carries out clock synchronization and communication, and the slave station equipment in the second interval does not carry out clock synchronization and only receives, forwards and closes the real-time message;
the on-line slave station equipment sends an on-line request to the master station equipment in a non-real-time message time slice;
the master station equipment judges whether the slave station equipment on line has a reserved time slice and whether the reserved time slice meets the requirement or not according to the received on-line request;
if the slave station equipment which is on line is judged to be provided with the reserved time slice and meets the requirement, the macro-cycle configuration is unchanged;
and if the slave station equipment which is on line is judged to have no reserved time slice or can not meet the requirement, the macro cycle is reconfigured, and all the slave station equipment carries out scheduling according to the reconfigured macro cycle.
8. A self-healing method according to claim 7, wherein when at least two slave devices in the ring network come on-line simultaneously, the on-line slave device and the slave device in the second interval have the receiving, forwarding and transmitting functions in a non-real-time period, and have the receiving and forwarding functions in a real-time non-period and a real-time period, respectively, and have no transmitting function.
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| CN112511397A (en) | 2021-03-16 |
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