CN111083198B - Communication link switching method, master domain server, slave domain server and system - Google Patents
Communication link switching method, master domain server, slave domain server and system Download PDFInfo
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- CN111083198B CN111083198B CN201911155287.4A CN201911155287A CN111083198B CN 111083198 B CN111083198 B CN 111083198B CN 201911155287 A CN201911155287 A CN 201911155287A CN 111083198 B CN111083198 B CN 111083198B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/14—Session management
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/14—Session management
- H04L67/141—Setup of application sessions
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/50—Network services
- H04L67/56—Provisioning of proxy services
- H04L67/568—Storing data temporarily at an intermediate stage, e.g. caching
Abstract
The invention provides a switching method of a communication link, a main domain server, a slave domain server and a system, wherein the main domain server determines the current main link and main domain main link information based on first link state information and sends the main domain main link information to the slave domain server; the slave domain server determines current master link and slave domain master link information based on the master domain master link information and second link state information, and feeds the slave domain master link information back to the master domain server; and if the OPC server connected with the main link indicated by the main domain main link information and the slave domain main link information is not the same OPC server, the main domain server determines whether to switch the main link based on the first link state information. The main domain server and the slave domain server respectively determine whether to switch the main link according to the link state information of the main domain server and the main link information of the opposite side, and ensure that the normal communication work is the same as the connected OPC server, thereby ensuring the consistency of the acquired data.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method, a master domain server, a slave domain server, and a system for switching a communication link.
Background
In the industrial field, industrial data is generally processed by a Distributed Control System (DCS). In processing industrial data, the DCS monitoring system typically needs to connect with OPC servers of other DCS manufacturers in order to acquire OPC data.
Currently, two redundant OPC servers are usually configured for industrial data security. The main domain server and the slave domain server in the DCS monitor system are connected with the OPC server in a one-to-one mode, namely, the main domain server is connected with one OPC server, and the slave domain server is connected with the other OPC server. On one hand, however, a server in the DCS monitoring system can only obtain OPC data from a single OPC server, and when a communication link between the server in the DCS monitoring system and the OPC server is interrupted, OPC communication is interrupted, so that normal communication operation cannot be guaranteed. On the other hand, since the OPC servers connected to the master domain server and the slave domain server are different, the consistency of the acquired data cannot be guaranteed.
Disclosure of Invention
In view of this, embodiments of the present invention provide a method, a master domain server, a slave domain server, and a system for switching a communication link, and solve the problem that the communication mode of the existing DCS monitoring system cannot guarantee normal communication work and cannot guarantee data consistency.
In order to achieve the above purpose, the embodiments of the present invention provide the following technical solutions:
the first aspect of the embodiments of the present invention discloses a method for switching a communication link, which is applicable to a home domain server, and the method includes:
determining a main link and main domain main link information of a current main domain server based on first link state information of a first communication link and a second communication link, wherein the first communication link is a communication link between the main domain server and a first OPC server, and the second communication link is a communication link between the main domain server and a second OPC server;
transmitting the master domain master link information to a slave domain server;
receiving slave domain master link information fed back by the slave domain server based on the master domain master link information and second link state information, wherein the second link state information is link state information of a third communication link and a fourth communication link of the slave domain server, the slave domain master link information is used for indicating the third communication link or the fourth communication link as a master link of the slave domain server, the third communication link is a communication link between the slave domain server and the first OPC server, and the fourth communication link is a communication link between the slave domain server and the second OPC server;
and if the OPC server connected with the main link indicated by the main domain main link information and the slave domain main link information is not the same OPC server, determining whether to switch the main link based on the first link state information.
Preferably, the determining the primary link of the current primary domain server based on the first link status information of the first communication link and the second communication link includes:
when the first communication link is a main link appointed by a main domain server, determining whether the communication states of the first communication link and the second communication link are normal;
if the communication state of the first communication link is normal, determining the first communication link as a main link of the current main domain server;
if the communication state of the first communication link is abnormal and the communication state of the second communication link is normal, determining the second communication link as the current main link of the main domain server;
alternatively, the first and second electrodes may be,
when the second communication link is a main link appointed by the main domain server, determining whether the communication states of the first communication link and the second communication link are normal;
if the communication state of the second communication link is normal, determining the second communication link as a main link of the current main domain server;
and if the communication state of the second communication link is abnormal and the communication state of the first communication link is normal, determining the first communication link as the current main link of the main domain server.
Preferably, if the OPC server of the connection between the slave domain master link information and the master link indicated by the master domain master link information is not the same OPC server, determining whether to switch the master link based on the first link state information includes:
if the main link of the main domain server is the first communication link and the main link of the slave domain server is the fourth communication link, determining whether the communication state of the second communication link is normal;
when the communication state of the second communication link is normal, switching the second communication link into a main link of the main domain server;
alternatively, the first and second electrodes may be,
if the main link of the main domain server is the second communication link and the main link of the slave domain server is the third communication link, determining whether the communication state of the first communication link is normal;
and when the communication state of the first communication link is normal, switching the first communication link to a main link of the main domain server.
The second aspect of the embodiment of the present invention discloses a method for switching a communication link, which is applicable to a slave domain server, and the method includes:
receiving main domain main link information sent by a main domain server, wherein the main domain main link information indicates that a main link of the main domain server is a first communication link or a second communication link, the first communication link is a communication link between the main domain server and a first OPC server, and the second communication link is a communication link between the main domain server and a second OPC server;
determining master link and slave domain master link information of a current slave domain server based on the master domain master link information and second link state information of a third communication link and a fourth communication link, wherein the third communication link is a communication link between the slave domain server and the first OPC server, and the fourth communication link is a communication link between the slave domain server and the second OPC server;
and feeding back the slave domain master link information to the master domain server.
Preferably, the determining the master link of the current slave domain server based on the master domain master link information and based on the second link status information of the third communication link and the fourth communication link includes:
when the main link of the main domain server is the first communication link, determining whether the communication states of a third communication link and a fourth communication link are normal;
if the communication state of the third communication link is normal, determining the third communication link as a main link of the current slave domain server;
if the communication state of the third communication link is abnormal and the communication state of the fourth communication link is normal, determining the fourth communication link as a main link of the current slave domain server;
alternatively, the first and second electrodes may be,
when the main link of the main domain server is the second communication link, determining whether the communication states of a third communication link and a fourth communication link are normal;
if the communication state of the fourth communication link is normal, determining the fourth communication link as a main link of the current slave domain server;
and if the communication state of the fourth communication link is abnormal and the communication state of the third communication link is normal, determining the third communication link as the current main link of the slave domain server.
A third aspect of the present invention discloses a home domain server, including:
a first determining unit, configured to determine a main link and main domain main link information of a current main domain server based on first link state information of a first communication link and a second communication link, where the first communication link is a communication link between the main domain server and a first OPC server, and the second communication link is a communication link between the main domain server and a second OPC server;
a sending unit, configured to send the home domain primary link information to a slave domain server;
a receiving unit, configured to receive slave domain master link information fed back by the slave domain server based on the master domain master link information and second link state information, where the second link state information is link state information of a third communication link and a fourth communication link of the slave domain server, the slave domain master link information is used to indicate the third communication link or the fourth communication link as a master link of the slave domain server, the third communication link is a communication link between the slave domain server and the first OPC server, and the fourth communication link is a communication link between the slave domain server and the second OPC server;
and a second determining unit, configured to determine whether to switch the main link based on the first link state information if the OPC server to which the main link indicated by the main domain main link information is connected to the sub-domain main link information is not the same OPC server.
Preferably, the first determining unit is specifically configured to: when a first communication link is a main link appointed by a main domain server, determining whether the communication states of the first communication link and a second communication link are normal, if the communication state of the first communication link is normal, determining the first communication link as the current main link of the main domain server, and if the communication state of the first communication link is abnormal, the communication state of the second communication link is normal, determining the second communication link as the current main link of the main domain server;
or, when the second communication link is a main link designated by the main domain server, determining whether the communication states of the first communication link and the second communication link are normal, if the communication state of the second communication link is normal, determining that the second communication link is used as the current main link of the main domain server, and if the communication state of the second communication link is abnormal, the communication state of the first communication link is normal, determining that the first communication link is used as the current main link of the main domain server.
A fourth aspect of the present invention discloses a slave domain server, including:
a receiving unit, configured to receive main domain main link information sent by a main domain server, where the main domain main link information indicates that a main link of the main domain server is a first communication link or a second communication link, the first communication link is a communication link between the main domain server and a first OPC server, and the second communication link is a communication link between the main domain server and a second OPC server;
a determining unit, configured to determine, based on the master domain master link information and based on second link state information of a third communication link and a fourth communication link, master link and slave domain master link information of a current slave domain server, where the third communication link is a communication link between the slave domain server and the first OPC server, and the fourth communication link is a communication link between the slave domain server and the second OPC server;
and the feedback unit is used for feeding back the slave domain master link information to the master domain server.
Preferably, the determining unit is specifically configured to: when the main link of the main domain server is the first communication link, determining whether the communication states of a third communication link and a fourth communication link are normal, and if the communication state of the third communication link is normal, determining the third communication link as the main link of the current slave domain server; if the communication state of the third communication link is abnormal and the communication state of the fourth communication link is normal, determining the fourth communication link as a main link of the current slave domain server;
or when the main link of the master domain server is the second communication link, determining whether the communication states of a third communication link and a fourth communication link are normal, if the communication state of the fourth communication link is normal, determining that the fourth communication link is used as the current main link of the slave domain server, and if the communication state of the fourth communication link is abnormal, the communication state of the third communication link is normal, determining that the third communication link is used as the current main link of the slave domain server.
A fifth aspect of the present invention discloses a system for switching a communication link, where the system includes: a master domain server disclosed in the third aspect of the embodiment of the present invention, and a slave domain server disclosed in the fourth aspect of the embodiment of the present invention.
Based on the above switching method, master domain server, slave domain server and system for communication link provided by the embodiments of the present invention, the method is: the master domain server determines current master link and master domain master link information based on first link state information of the first communication link and the second communication link, and sends the master domain master link information to the slave domain server; the slave domain server determines current master link and slave domain master link information based on the master domain master link information and second link state information of the third communication link and the fourth communication link, and feeds the slave domain master link information back to the master domain server; and if the OPC server connected with the main link indicated by the main domain main link information and the slave domain main link information is not the same OPC server, the main domain server determines whether to switch the main link based on the first link state information. The main domain server and the slave domain server respectively determine whether to switch the main link according to the link state information of the main domain server and the main link information of the other side, so that normal communication work is ensured, and the main domain server and the OPC server connected with the slave domain server are ensured to be the same, thereby ensuring the consistency of the acquired data.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic diagram illustrating a connection between a server and an OPC server in a DCS monitoring system according to an embodiment of the present invention;
fig. 2 is a flowchart of a method for switching a communication link according to an embodiment of the present invention;
FIG. 3 is a flow chart of determining a primary link of a current home domain server according to an embodiment of the present invention;
FIG. 4 is another flow chart for determining a primary link of a current home domain server according to an embodiment of the present invention;
FIG. 5 is a flow chart of determining a master link of a current slave domain server according to an embodiment of the present invention;
FIG. 6 is another flow chart for determining a master link of a current slave domain server according to an embodiment of the present invention;
fig. 7 is another flowchart of a method for switching a communication link according to an embodiment of the present invention;
fig. 8 is a flowchart of a method for switching a communication link according to an embodiment of the present invention;
fig. 9 is a block diagram illustrating a structure of a home domain server according to an embodiment of the present invention;
fig. 10 is a block diagram of a slave domain server according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In this application, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.
As known from the background art, a master domain server and a slave domain server in a DCS monitoring system are connected to an OPC server in a one-to-one manner, and when a communication link between the server in the DCS monitoring system and the OPC server is interrupted, OPC communication is interrupted, so that normal communication operation cannot be guaranteed. Meanwhile, the consistency of the acquired data cannot be ensured because the main domain server and the OPC server connected with the slave domain server are different.
Therefore, an embodiment of the present invention provides a method, a master domain server, a slave domain server and a system for switching a communication link, where the master domain server is connected to a first OPC server and a second OPC server, respectively, and the slave domain server is also connected to the first OPC server and the second OPC server, respectively. The main domain server and the slave domain server respectively determine whether to switch the main link according to the link state information of the main domain server and the main link information of the opposite side so as to ensure that the OPC servers connected with the main domain server and the slave domain server are the same, thereby ensuring the consistency of the acquired data.
It should be noted that, in the DCS monitoring system, when both the master domain server and the slave domain server are operating normally, both the master domain server and the slave domain server process data obtained from the OPC server, and the master domain server sends the processing result to other devices in the DCS monitoring system. The slave domain server only processes the data obtained from the OPC server and does not send the processing result to other equipment in the DCS monitoring system.
When the master domain server fails and the slave domain server operates normally, the slave domain server replaces the master domain server to work, namely the slave domain server sends the processing result to other equipment in the DCS monitoring system, so that the normal operation of the DCS monitoring system is ensured.
Referring to fig. 1, a schematic diagram of a connection between a server and an OPC server in a DCS monitoring system according to an embodiment of the present invention is shown. The main domain server and the slave domain server are used as OPC clients and are respectively connected with the OPC servers, and corresponding data are obtained from the OPC servers.
The main domain server is respectively connected with the first OPC server and the second OPC server, a communication link between the main domain server and the first OPC server is a first communication link, and a communication link between the main domain server and the second OPC server is a second communication link. Upon activation of the home domain server, the home domain server selects the first communication link as the primary link for the home domain server.
The slave domain server is respectively connected with the first OPC server and the second OPC server, a communication link between the slave domain server and the first OPC server is a third communication link, and a communication link between the slave domain server and the second OPC server is a fourth communication link. Upon starting the slave domain server, the slave domain server selects the third communication link as the master link of the slave domain server.
The master domain server and the slave domain server are connected and report respective master link information and running state information to each other.
It should be noted that, for the master domain server and the slave domain server, only the data acquired from the master link is processed, and the data acquired from the other link is cached in the memory of the slave domain server. When the main link is switched, the data cached in the memory is sent to an upper application program, and the undisturbed switching of the main link is ensured.
Referring to fig. 2 in conjunction with the content shown in fig. 1, a flowchart of a handover method of a communication link according to an embodiment of the present invention is shown, where the handover method includes the following steps:
step S201: the home domain server determines a home link and home domain home link information of a current home domain server based on first link state information of the first communication link and the second communication link.
In the process of implementing step S201, the home domain server obtains first link status information of the first communication link and the second communication link, respectively. And determining whether the communication state of the first communication link is normal according to the first link state information of the first communication link, and determining whether the communication state of the second communication link is normal according to the first link state information of the second communication link, thereby determining the main link and the main domain main link information of the current main domain server. The home domain home link information indicates that a home link of the current home domain server is a first communication link or a second communication link.
Step S202: the master domain server transmits the master domain master link information to the slave domain server.
In the process of implementing step S202 specifically, the master domain server sends the master domain master link information to the slave domain server, so that the slave domain server determines whether to switch the master link according to the master domain master link information.
Step S203: the slave domain server determines master link and slave domain master link information of the current slave domain server based on the master domain master link information and based on second link state information of the third communication link and the fourth communication link.
In the process of implementing step S203 specifically, the second link status information of the third communication link and the fourth communication link is acquired from the domain server. And determining whether the communication state of the fourth communication link is normal according to the second link state information of the third communication link, and determining whether the communication state of the fourth communication link is normal according to the second link state information of the fourth communication link. The master link and slave domain master link information of the current slave domain server are determined in conjunction with the master domain master link information. Wherein the slave domain master link information indicates that the master link of the slave domain server is the third communication link or the fourth communication link.
Step S204: and the slave domain server feeds back the slave domain main link information to the master domain server.
Step S205: the main domain server determines whether the OPC server connected to the main link indicated by the main domain main link information and the sub domain main link information is the same OPC server, if not, step S206 is executed, and if so, step S207 is executed.
In the process of implementing step S205 specifically, the main domain server determines whether the OPC server connected to the main link of the slave domain server and the main link of the main domain server is the same according to the slave domain main link information, and if not, the main domain server determines whether to switch the main link according to the first link state information. If the two links are the same, the main domain server does not switch the main link.
Step S206: the home domain server determines whether to switch the primary link based on the first link state information.
In the process of implementing step S206 specifically, if the OPC server connected to the main link indicated by the sub-domain main link information and the main link indicated by the main domain main link information is not the same OPC server, the main domain server determines whether to switch the main link based on the first link state information as follows:
the master domain server determines that the master link of the slave domain server is a fourth communication link according to the slave domain master link information, the master link of the master domain server is a first communication link, and the master domain server determines whether the communication state of the second communication link is normal. And if the communication state of the second communication link is normal, the main domain server switches the second communication link into the main link of the main domain server. If the communication state of the second communication link is abnormal, the main domain server does not switch the main link.
The main domain server determines that the main link of the slave domain server is a third communication link and the main link of the main domain server is a second communication link according to the slave domain main link information, and the main domain server determines whether the communication state of the first communication link is normal. And if the communication state of the first communication link is normal, the main domain server switches the first communication link into the main link. If the communication state of the first communication link is abnormal, the main domain server does not switch the main link.
Step S207: the home domain server does not switch the primary link.
In the embodiment of the invention, the master domain server determines the current master link and master domain master link information according to the first link state information, and sends the master domain master link information to the slave domain server. And the slave domain server determines the current main link and slave domain main link information according to the main domain main link information and the second link state information, and feeds back the slave domain main link information to the main domain server. The main domain server and the slave domain server respectively determine whether to switch the main link according to the link state information of the main domain server and the main link information of the other side, so that normal communication work is ensured, and the main domain server and the OPC server connected with the slave domain server are ensured to be the same, thereby ensuring the consistency of the acquired data.
The above embodiment of the present invention, referring to fig. 3, which is a flowchart illustrating a process of determining a main link of a current home domain server, when a first communication link is a main link specified by a home domain server, in step S201 of fig. 2, the process of determining the main link of the current home domain server according to the embodiment of the present invention includes the following steps:
step S301: when the first communication link is a main link designated by the main domain server, the main domain server determines whether the communication states of the first communication link and the second communication link are normal.
In the process of implementing step S301 specifically, the home domain server determines whether the communication state of the first communication link is normal according to the first link state information of the first communication link, and determines whether the communication state of the second communication link is normal according to the first link state information of the second communication link.
Step S302: if the communication state of the first communication link is normal, the main domain server determines that the first communication link is used as the main link of the current main domain server.
Step S303: if the communication state of the first communication link is abnormal and the communication state of the second communication link is normal, the main domain server determines that the second communication link is used as the main link of the current main domain server.
Accordingly, the above-mentioned embodiment of the present invention, referring to the process of determining the primary link of the current home domain server in step S201 of fig. 2, when the second communication link is the primary link designated by the home domain server, referring to fig. 4, shows another flowchart for determining the primary link of the current home domain server provided by the embodiment of the present invention, which includes the following steps:
step S401: when the second communication link is the main link designated by the main domain server, the main domain server determines whether the communication states of the first communication link and the second communication link are normal.
Step S402: if the communication state of the second communication link is normal, the main domain server determines that the second communication link is used as the main link of the current main domain server.
Step S403: if the communication state of the second communication link is abnormal and the communication state of the first communication link is normal, the main domain server determines that the first communication link is used as the main link of the current main domain server.
It should be noted that, if the communication states of the first communication link and the second communication link are both abnormal, the flag signal indicating the communication states of the first communication link and the second communication link is set as the preset information. For example, a flag signal indicating the communication status of the first communication link and the second communication link is set to "BAD". Meanwhile, if the communication states of the first communication link and the second communication link are abnormal, the main domain server is reconnected with the first OPC server and the second OPC server respectively.
In the embodiment of the invention, the main domain server determines whether the communication states of the first communication link and the second communication link are normal or not according to the first link state information of the first communication link and the second communication link, so that the main link of the current main domain server is determined, and the main link selected by the main domain server can ensure that the communication work is normal.
In the above-mentioned embodiment of the present invention, the process of determining the master link of the current slave domain server in step S203 in fig. 2, when the master link of the master domain server is the first communication link, referring to fig. 5, shows a flowchart for determining the master link of the current slave domain server provided in the embodiment of the present invention, and includes the following steps:
step S501: when the main link of the main domain server is the first communication link, the slave domain server determines whether the communication states of the third communication link and the fourth communication link are normal.
As can be seen from the foregoing, the OPC server to which the master link of the master domain server and the slave domain server are connected needs to be the same. Therefore, in the process of implementing step S501 specifically, when the master domain master link information indicates that the master link of the master domain server is the first communication link, the slave domain server determines whether the communication states of the third communication link and the fourth communication link are normal according to the second link state information. And if the communication state of the third communication link is normal, determining that the third communication link is the main link of the current slave domain server. And if the communication state of the third communication link is abnormal and the communication state of the fourth communication link is normal, determining the fourth communication link as the main link of the current slave domain server.
Step S502: and if the communication state of the third communication link is normal, the slave domain server determines that the third communication link is used as the main link of the current slave domain server.
Step S503: and if the communication state of the third communication link is abnormal and the communication state of the fourth communication link is normal, the slave domain server determines the fourth communication link as the main link of the current slave domain server.
Accordingly, in the above-mentioned embodiment of the present invention, the process of determining the master link of the current slave domain server in step S203 in fig. 2, when the master link of the master domain server is the second communication link, referring to fig. 6, shows a flowchart for determining the master link of the current slave domain server provided in the embodiment of the present invention, and includes the following steps:
step S601: and when the main link of the main domain server is the second communication link, the slave domain server determines whether the communication states of the third communication link and the fourth communication link are normal.
Step S602: and if the communication state of the fourth communication link is normal, the slave domain server determines the fourth communication link as the main link of the current slave domain server.
Step S603: and if the communication state of the fourth communication link is abnormal and the communication state of the third communication link is normal, the slave domain server determines the third communication link as the main link of the current slave domain server.
It should be noted that, if the communication states of the third communication link and the fourth communication link are both abnormal, the flag signal indicating the communication states of the third communication link and the fourth communication link is set as the preset information. For example, a flag signal indicating the communication status of the third communication link and the fourth communication link is set to "BAD". Meanwhile, if the communication states of the third communication link and the fourth communication link are abnormal, the slave domain server is reconnected with the first OPC server and the second OPC server respectively.
In the embodiment of the invention, the slave domain server determines the current master link of the slave domain server according to the master domain master link information and the communication states of the third communication link and the fourth communication link, and ensures that the master links of the master domain server and the slave domain server are connected with the same OPC server, thereby ensuring the consistency of the data acquired by the master domain server and the slave domain server.
To better explain the contents of fig. 2 to fig. 6 in the above embodiments of the present invention, the contents shown in fig. 7 and fig. 8 are used for illustration, and it should be noted that the contents shown in fig. 7 and fig. 8 are used for illustration only. Referring to fig. 7, another flowchart of a method for switching a communication link according to an embodiment of the present invention is shown, including the following steps:
step S701: the home domain server starts.
Step S702: the main domain server is connected with the first OPC server.
Step S703: the main domain server is connected with a second OPC server.
Step S704: the home domain server selects the first communication link as the primary link.
Step S705: the main domain server loops through the communication status check.
In the process of implementing step S705 specifically, the master domain server determines whether the master link needs to be switched according to the communication state of the first communication link, the communication state of the second communication link, and the slave domain master link information. For details, how to determine whether to switch the primary link refers to the contents shown in fig. 2 to fig. 6 in the above embodiments of the present invention, which are not described herein again.
In the process of checking the communication status, the master domain server receives the slave domain master link information transmitted from the slave domain server, and also transmits the master domain master link information to the slave domain server.
Step S706: the home domain server determines whether a primary link needs to be handed over. If necessary, the main link is switched, and the process returns to step S705. If not, the process returns to step S705.
Referring to fig. 8, there is shown another flowchart of a method for switching a communication link according to an embodiment of the present invention, including the following steps:
step S801: from the domain server.
Step S802: the first OPC server is connected to the slave domain server.
Step S803: the second OPC server is connected from the domain server.
Step S804: the third communication link is selected as the primary link from the domain server.
Step S805: communication status checks are looped from the domain server.
In the process of implementing step S805 specifically, the slave domain server determines whether the master link needs to be switched according to the communication state of the third communication link, the communication state of the fourth communication link, and the master domain master link information. For details, reference is made to the contents shown in fig. 2 to fig. 6 in the above embodiments of the present invention for determining whether to switch the primary link, and details are not described herein again.
It should be noted that, during the communication status check, the slave domain server receives the master domain master link information sent by the master domain server, and also sends the slave domain master link information to the master domain server.
Step S806: the slave domain server determines whether a handover of the primary link is required. If necessary, the main link is switched, and the process returns to step S805. If not, the process returns to step S805.
In the embodiment of the invention, the main domain server and the slave domain server respectively determine whether to switch the main link according to the self link state information and the main link information of the opposite side, so that the normal communication work is ensured, and the main domain server and the OPC server connected with the slave domain server are ensured to be the same, thereby ensuring the consistency of the acquired data.
Corresponding to the method for switching a communication link provided in the foregoing embodiment of the present invention, referring to fig. 9, an embodiment of the present invention further provides a structural block diagram of a home domain server, where the home domain server includes: a first determination unit 901, a transmission unit 902, a reception unit 903, and a second determination unit 904;
a first determining unit 901, configured to determine a main link and main domain main link information of a current main domain server based on first link state information of a first communication link and a second communication link, where the first communication link is a communication link between the main domain server and a first OPC server, and the second communication link is a communication link between the main domain server and a second OPC server.
In a specific implementation, the first determining unit 901 is specifically configured to: when the first communication link is a main link appointed by the main domain server, determining whether the communication states of the first communication link and the second communication link are normal, if the communication state of the first communication link is normal, determining that the first communication link is used as the main link of the current main domain server, and if the communication state of the first communication link is abnormal, the communication state of the second communication link is normal, determining that the second communication link is used as the main link of the current main domain server;
alternatively, the first determining unit 901 is specifically configured to: and when the second communication link is the main link appointed by the main domain server, determining whether the communication states of the first communication link and the second communication link are normal, if the communication state of the second communication link is normal, determining that the second communication link is used as the main link of the current main domain server, and if the communication state of the second communication link is abnormal, the communication state of the first communication link is normal, determining that the first communication link is used as the main link of the current main domain server.
A sending unit 902, configured to send the master domain master link information to the slave domain server.
A receiving unit 903, configured to receive slave domain master link information fed back by the slave domain server based on the master domain master link information and second link state information, where the second link state information is link state information of a third communication link and a fourth communication link of the slave domain server, the slave domain master link information is used to indicate the third communication link or the fourth communication link as a master link of the slave domain server, the third communication link is a communication link between the slave domain server and the first OPC server, and the fourth communication link is a communication link between the slave domain server and the second OPC server.
A second determining unit 904, configured to determine whether to switch the main link based on the first link state information if the OPC server to which the main link indicated by the main domain main link information is connected is not the same OPC server.
In a specific implementation, the second determining unit 904 is specifically configured to: and if the main link of the main domain server is the first communication link and the main link of the slave domain server is the fourth communication link, determining whether the communication state of the second communication link is normal. And when the communication state of the second communication link is normal, switching the second communication link into the main link of the main domain server.
Alternatively, the second determining unit 904 is specifically configured to: and if the main link of the main domain server is the second communication link and the main link of the slave domain server is the third communication link, determining whether the communication state of the first communication link is normal. And when the communication state of the first communication link is normal, switching the first communication link to a main link of the main domain server.
In the embodiment of the invention, the main domain server determines the current main link and the main domain main link information according to the first link state information, and sends the main domain main link information to the slave domain server. And determines whether to switch the primary link according to the secondary domain primary link information fed back from the secondary domain server. The main domain server and the slave domain server respectively determine whether to switch the main link according to the link state information of the main domain server and the main link information of the other side, so that normal communication work is ensured, and the main domain server and the OPC server connected with the slave domain server are ensured to be the same, thereby ensuring the consistency of the acquired data.
Corresponding to the method for switching a communication link provided in the foregoing embodiment of the present invention, referring to fig. 10, an embodiment of the present invention further provides a structural block diagram of a slave domain server, where the slave domain server includes: a receiving unit 1001, a determining unit 1002, and a feedback unit 1003;
a receiving unit 1001, configured to receive main domain main link information sent by a main domain server, where the main domain main link information indicates that a main link of the main domain server is a first communication link or a second communication link, the first communication link is a communication link between the main domain server and a first OPC server, and the second communication link is a communication link between the main domain server and a second OPC server.
A determining unit 1002, configured to determine, based on the master domain master link information and based on second link state information of a third communication link and a fourth communication link, the master link and the slave domain master link information of a current slave domain server, where the third communication link is a communication link between the slave domain server and the first OPC server, and the fourth communication link is a communication link between the slave domain server and the second OPC server.
In a specific implementation, the determining unit 1002 is specifically configured to: when the main link of the main domain server is a first communication link, determining whether the communication states of a third communication link and a fourth communication link are normal, and if the communication state of the third communication link is normal, determining the third communication link as the main link of the current slave domain server; if the communication state of the third communication link is abnormal and the communication state of the fourth communication link is normal, determining the fourth communication link as a main link of the current slave domain server;
or, the determining unit 1002 is specifically configured to: when the main link of the main domain server is the second communication link, determining whether the communication states of the third communication link and the fourth communication link are normal, if the communication state of the fourth communication link is normal, determining that the fourth communication link is used as the main link of the current slave domain server, and if the communication state of the fourth communication link is abnormal, determining that the communication state of the third communication link is normal, determining that the third communication link is used as the main link of the current slave domain server.
A feedback unit 1003, configured to feed back the slave domain master link information to the master domain server.
In the embodiment of the invention, the slave domain server determines the current master link of the slave domain server according to the master domain master link information and the communication states of the third communication link and the fourth communication link, and ensures that the master links of the master domain server and the slave domain server are connected with the same OPC server, thereby ensuring the consistency of the data acquired by the master domain server and the slave domain server.
Correspondingly, the embodiment of the invention provides a method for switching a communication link, and further provides a system for switching a communication link, which comprises a master domain server and a slave domain server. The specific content of the master domain server refers to the content shown in fig. 9 of the embodiment of the present invention, and the specific content of the slave domain server refers to the content shown in fig. 10 of the embodiment of the present invention.
To sum up, the embodiment of the present invention provides a method, a master domain server, a slave domain server and a system for switching a communication link, where the method includes: the master domain server determines current master link and master domain master link information based on first link state information of the first communication link and the second communication link, and sends the master domain master link information to the slave domain server; the slave domain server determines current master link and slave domain master link information based on the master domain master link information and second link state information of the third communication link and the fourth communication link, and feeds the slave domain master link information back to the master domain server; and if the OPC server connected with the main link indicated by the main domain main link information and the slave domain main link information is not the same OPC server, the main domain server determines whether to switch the main link based on the first link state information. The main domain server and the slave domain server respectively determine whether to switch the main link according to the link state information of the main domain server and the main link information of the other side, so that normal communication work is ensured, and the main domain server and the OPC server connected with the slave domain server are ensured to be the same, thereby ensuring the consistency of the acquired data.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, the system or system embodiments are substantially similar to the method embodiments and therefore are described in a relatively simple manner, and reference may be made to some of the descriptions of the method embodiments for related points. The above-described system and system embodiments are only illustrative, wherein the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A method for handover of a communication link, adapted to a home domain server, the method comprising:
determining a main link and main domain main link information of a current main domain server based on first link state information of a first communication link and a second communication link, wherein the first communication link is a communication link between the main domain server and a first OPC server, and the second communication link is a communication link between the main domain server and a second OPC server;
transmitting the master domain master link information to a slave domain server; enabling the slave domain server to determine whether the master link needs to be switched according to the master domain master link information; wherein, the slave domain server determining whether it needs to switch the main link according to the main domain main link information comprises: the method comprises the steps that a slave domain server determines whether a communication link between the slave domain server and an OPC server corresponding to a main domain main link is normal or not, and if the communication link is normal, the communication link between the slave domain server and the OPC server corresponding to the main domain main link is used as a slave domain main link;
receiving slave domain master link information fed back by the slave domain server based on the master domain master link information and second link state information, wherein the second link state information is link state information of a third communication link and a fourth communication link of the slave domain server, the slave domain master link information is used for indicating the third communication link or the fourth communication link as a master link of the slave domain server, the third communication link is a communication link between the slave domain server and the first OPC server, and the fourth communication link is a communication link between the slave domain server and the second OPC server;
and if the OPC server connected with the main link indicated by the main domain main link information and the sub domain main link information is not the same OPC server, determining whether to switch the main link based on the first link state information, and if the communication link between the main domain server and the OPC server corresponding to the sub domain main link is normal, switching the main link.
2. The method of claim 1, wherein determining the primary link of the current home domain server based on the first link state information of the first communication link and the second communication link comprises:
when the first communication link is a main link appointed by a main domain server, determining whether the communication states of the first communication link and the second communication link are normal;
if the communication state of the first communication link is normal, determining the first communication link as a main link of the current main domain server;
if the communication state of the first communication link is abnormal and the communication state of the second communication link is normal, determining the second communication link as the current main link of the main domain server;
alternatively, the first and second electrodes may be,
when the second communication link is a main link appointed by the main domain server, determining whether the communication states of the first communication link and the second communication link are normal;
if the communication state of the second communication link is normal, determining the second communication link as a main link of the current main domain server;
and if the communication state of the second communication link is abnormal and the communication state of the first communication link is normal, determining the first communication link as the current main link of the main domain server.
3. The method of claim 1, wherein the determining whether to switch the primary link based on the first link status information if the OPC server of the connection between the secondary domain primary link information and the primary link indicated by the primary domain primary link information is not the same OPC server comprises:
if the main link of the main domain server is the first communication link and the main link of the slave domain server is the fourth communication link, determining whether the communication state of the second communication link is normal;
when the communication state of the second communication link is normal, switching the second communication link into a main link of the main domain server;
alternatively, the first and second electrodes may be,
if the main link of the main domain server is the second communication link and the main link of the slave domain server is the third communication link, determining whether the communication state of the first communication link is normal;
and when the communication state of the first communication link is normal, switching the first communication link to a main link of the main domain server.
4. A method for handover of a communication link, adapted to be used from a domain server, the method comprising:
receiving main domain main link information sent by a main domain server, wherein the main domain main link information indicates that a main link of the main domain server is a first communication link or a second communication link, the first communication link is a communication link between the main domain server and a first OPC server, and the second communication link is a communication link between the main domain server and a second OPC server;
determining master link and slave domain master link information of a current slave domain server based on the master domain master link information and second link state information of a third communication link and a fourth communication link, wherein the third communication link is a communication link between the slave domain server and the first OPC server, and the fourth communication link is a communication link between the slave domain server and the second OPC server;
feeding back the slave domain master link information to the master domain server;
wherein the master link of the slave domain server comprises: and the slave domain server determines whether a communication link between the slave domain server and an OPC server corresponding to the main domain main link is normal, and if the communication link is normal, the communication link between the slave domain server and the OPC server corresponding to the main domain main link is used as the slave domain main link.
5. The method of claim 4, wherein determining the master link of the current slave domain server based on the master domain master link information and based on the second link state information of the third communication link and the fourth communication link comprises:
when the main link of the main domain server is the first communication link, determining whether the communication states of a third communication link and a fourth communication link are normal;
if the communication state of the third communication link is normal, determining the third communication link as a main link of the current slave domain server;
if the communication state of the third communication link is abnormal and the communication state of the fourth communication link is normal, determining the fourth communication link as a main link of the current slave domain server;
alternatively, the first and second electrodes may be,
when the main link of the main domain server is the second communication link, determining whether the communication states of a third communication link and a fourth communication link are normal;
if the communication state of the fourth communication link is normal, determining the fourth communication link as a main link of the current slave domain server;
and if the communication state of the fourth communication link is abnormal and the communication state of the third communication link is normal, determining the third communication link as the current main link of the slave domain server.
6. A home domain server, characterized in that the home domain server comprises:
a first determining unit, configured to determine a main link and main domain main link information of a current main domain server based on first link state information of a first communication link and a second communication link, where the first communication link is a communication link between the main domain server and a first OPC server, and the second communication link is a communication link between the main domain server and a second OPC server;
a sending unit, configured to send the home domain primary link information to a slave domain server; enabling the slave domain server to determine whether the master link needs to be switched according to the master domain master link information; wherein, the slave domain server determining whether it needs to switch the main link according to the main domain main link information comprises: the method comprises the steps that a slave domain server determines whether a communication link between the slave domain server and an OPC server corresponding to a main domain main link is normal or not, and if the communication link is normal, the communication link between the slave domain server and the OPC server corresponding to the main domain main link is used as a slave domain main link;
a receiving unit, configured to receive slave domain master link information fed back by the slave domain server based on the master domain master link information and second link state information, where the second link state information is link state information of a third communication link and a fourth communication link of the slave domain server, the slave domain master link information is used to indicate the third communication link or the fourth communication link as a master link of the slave domain server, the third communication link is a communication link between the slave domain server and the first OPC server, and the fourth communication link is a communication link between the slave domain server and the second OPC server;
and a second determining unit, configured to determine whether to switch the main link based on the first link state information if the OPC server to which the main link indicated by the main domain main link information is connected to the sub domain main link information is not the same OPC server, and switch the main link if a communication link between the main domain server and the OPC server corresponding to the sub domain main link is normal.
7. The home domain server of claim 6, wherein the first determining unit is specifically configured to: when a first communication link is a main link appointed by a main domain server, determining whether the communication states of the first communication link and a second communication link are normal, if the communication state of the first communication link is normal, determining the first communication link as the current main link of the main domain server, and if the communication state of the first communication link is abnormal, the communication state of the second communication link is normal, determining the second communication link as the current main link of the main domain server;
or, when the second communication link is a main link designated by the main domain server, determining whether the communication states of the first communication link and the second communication link are normal, if the communication state of the second communication link is normal, determining that the second communication link is used as the current main link of the main domain server, and if the communication state of the second communication link is abnormal, the communication state of the first communication link is normal, determining that the first communication link is used as the current main link of the main domain server.
8. A slave domain server, characterized in that the slave domain server comprises:
a receiving unit, configured to receive main domain main link information sent by a main domain server, where the main domain main link information indicates that a main link of the main domain server is a first communication link or a second communication link, the first communication link is a communication link between the main domain server and a first OPC server, and the second communication link is a communication link between the main domain server and a second OPC server;
a determining unit, configured to determine, based on the master domain master link information and based on second link state information of a third communication link and a fourth communication link, master link and slave domain master link information of a current slave domain server, where the third communication link is a communication link between the slave domain server and the first OPC server, and the fourth communication link is a communication link between the slave domain server and the second OPC server; wherein the master link of the slave domain server comprises: the method comprises the steps that a slave domain server determines whether a communication link between the slave domain server and an OPC server corresponding to a main domain main link is normal or not, and if the communication link is normal, the communication link between the slave domain server and the OPC server corresponding to the main domain main link is used as a slave domain main link;
and the feedback unit is used for feeding back the slave domain master link information to the master domain server.
9. The slave domain server according to claim 8, wherein the determining unit is specifically configured to: when the main link of the main domain server is the first communication link, determining whether the communication states of a third communication link and a fourth communication link are normal, and if the communication state of the third communication link is normal, determining the third communication link as the main link of the current slave domain server; if the communication state of the third communication link is abnormal and the communication state of the fourth communication link is normal, determining the fourth communication link as a main link of the current slave domain server;
or, when the main link of the master domain server is the second communication link, determining whether the communication states of a third communication link and a fourth communication link are normal, if the communication state of the fourth communication link is normal, determining that the fourth communication link is used as the current main link of the slave domain server, and if the communication state of the fourth communication link is abnormal, the communication state of the third communication link is normal, determining that the third communication link is used as the current main link of the slave domain server.
10. A switching system for a communication link, the switching system comprising: the master domain server of claim 6 or 7, and the slave domain server of claim 8 or 9.
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Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2005279575B2 (en) * | 2004-08-29 | 2009-05-21 | Huawei Technologies Co., Ltd. | A method for implementing dual-homing |
| CN100574486C (en) * | 2004-08-29 | 2009-12-23 | 华为技术有限公司 | The system of dual-homing networking and method thereof in the communication network |
| EP1860564A1 (en) * | 2006-05-26 | 2007-11-28 | Siemens Aktiengesellschaft | Method and device for exchanging data based on the OPC communication protocol between the redundant components of a process control system |
| JP2016015065A (en) * | 2014-07-03 | 2016-01-28 | 株式会社日立製作所 | Process monitoring/control system |
| CN105099771B (en) * | 2015-07-02 | 2018-04-24 | 北京东土科技股份有限公司 | A kind of active/standby link switchover, realize link redundancy backup method and device |
| CN106487679B (en) * | 2015-09-02 | 2019-11-08 | 北京国基科技股份有限公司 | The active-standby switch system and switching method of Ethernet switch |
| CN106383770B (en) * | 2016-09-26 | 2019-05-10 | 郑州云海信息技术有限公司 | A kind of method and server of server monitoring management |
| CN107894924A (en) * | 2017-04-18 | 2018-04-10 | 中电科技（北京）有限公司 | The method to be communicated based on OBP BIOS with multiple domain operating system |
| CN107404412A (en) * | 2017-09-12 | 2017-11-28 | 浙江中控技术股份有限公司 | A kind of switching method of server, device, system and electronic equipment |
| CN109120515B (en) * | 2018-08-20 | 2021-08-20 | 网易（杭州）网络有限公司 | Information processing method, device, medium and computing equipment in communication system |
-
2019
- 2019-11-22 CN CN201911155287.4A patent/CN111083198B/en active Active
Non-Patent Citations (1)
| Title |
|---|
| Li Dongjiang等.Implement of communication between configuration software and OPC server based on Modbus/TCP.《IEEE 2011 10th International conference on Electronic Measurement & Instruments》.2011, * |
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