CN101047487A - Method and system for solving equipment redundant in industrial control network - Google Patents
Method and system for solving equipment redundant in industrial control network Download PDFInfo
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Abstract
A method for realizing device redundancy in industrial control network includes broadcasting declaration message of redundant device state in network periodically by operation device, switching itself state over on operation state by back-up device if said declaration message is not received by back-up device of operation device and broadcasting switchover message of redundant device in network, updating communication connection of operation device to be communication connection with said back-up device by device received said switchover message and set in network.
Description
Technical field
The present invention relates to communication technical field, be meant the method and system of equipment redundancy in a kind of industrial control network especially.
Background technology
At present, in industrial control system, can field apparatus run well, and will produce bigger influence to normal industrial production, personal safety.The characteristics of industrial control system are real-time, and the real time data amount is many, emphasizes real-time.When industrial control system moves, data mostly are real-time control data in the field control network, real-time requires the highest, and the control appliance of field control network layer is owing to be subjected to the influence of various aspects factor, the method of requirement network device redundancy can not be too complicated, can not take very long running time, and the traffic load portion that is produced by the field apparatus redundancy can be excessive, alternate device must be lacked switching time, to guarantee industrial continuity.Therefore, for the redundancy between the field apparatus, be the emphasis of studying in the industrial control field always.
Field apparatus comprises working equipment and alternate device.In the network of Industry Control, when realizing, be the 1:1 redundancy scheme to working equipment redundant, promptly each working equipment has a corresponding alternate device.After being linked into working equipment and alternate device in the industrial control network, between working equipment and alternate device, set up dedicated data line, working equipment and alternate device communicate by the data wire of special use.Under normal working condition, working equipment is in running order, and alternate device is in Status of Backups.If working equipment breaks down, then coupled alternate device switches to operating state with the Status of Backups of self, continues the original performed control operation of execution work equipment.
When communicating by letter between the above-mentioned method, each working equipment and its alternate device, need carry out data communication by setting up special-purpose data wire to the working equipment redundancy, more loaded down with trivial details when technology realizes; And for important working equipment, when the alternate device that will connect for it more than two, implementation procedure is complicated and can't obtain good redundant technique effect.At present, in industrial control network, formulate the uniform communication agreement, the working equipment and the alternate device of different agreement can be linked in the Control Network, but how under this industrial control network environment, realize the redundancy between working equipment and the alternate device, also be not resolved.
Summary of the invention
In view of this, the invention reside in the method and system that equipment redundancy in a kind of industrial control network is provided, above-mentioned under the network environment of unified communication protocol to solve, realize the redundancy issue between working equipment and the alternate device.
For addressing the above problem, the invention provides the method for equipment redundancy in a kind of industrial control network, comprising:
Working equipment is broadcasted redundance unit state statement message in network;
In the predetermined cycle, if the alternate device of described working equipment does not receive the statement message from working equipment, then the state exchange with self is an operating state, and broadcasting redundance unit state switches message in network;
Receive the equipment of described switching message in the network, will with the communicating to connect of described working equipment, be updated to and the communicating to connect of described alternate device.
Wherein, the alternate device of described working equipment is Liang Tai and two when above, after each alternate device is broadcasted self in network redundance unit state switches message, further comprises:
In switching time, alternate device receives the described switching message in the network at equipment redundancy, and redundant priority is competed out the highest alternate device of priority in the utilization switching message;
Described be updated to described alternate device communicate to connect for:
Receive the equipment of described switching message, will with the communicating to connect of described working equipment, upgrade and the communicating to connect of the highest alternate device of described priority.
Wherein, described competition may further comprise the steps:
Alternate device obtains redundant precedence information in the described switching message, compares with self redundant priority, judges whether the redundant priority of self is lower than the redundant priority of being obtained,
If be lower than, then self working state is switched to Status of Backups, stop to send described switching message;
If be higher than, then keep operating state.
Wherein, receive the equipment of described switching message, upgrade with the highest alternate device of described priority communicate to connect for:
Obtain redundant precedence information in the described switching message that receives, the redundant priority in the switching message that receives with the last time compares,
If be lower than the redundant priority in the switching message that the last time receives, then keep former correspondence constant;
If be higher than the redundant priority in the switching message that the last time receives, then upgrade correspondence, until being updated to and the communicating to connect of the highest alternate device of described priority.
Wherein, this method further comprises:
Working equipment receives data identical in the network with alternate device and handles, and before the described renewal, the result after handling is carried out or sent to described working equipment, and described alternate device is not carried out or sent the result after handling; After the described renewal, the result after handling is carried out or sent to described alternate device.
Wherein, comprise before this method:
After described alternate device joins in the network, described working equipment to appointment sends redundance unit data synchronization request message, described working equipment uses redundance unit data sync message that synchrodata is sent to alternate device in batches behind the redundance unit data synchronization request message that receives the alternate device transmission.
The present invention also provides the system of equipment redundancy in a kind of industrial control network, and this system comprises:
Working equipment is used for to network broadcasting redundance unit state statement message;
Alternate device was used in the predetermined cycle, if do not receive the statement message from working equipment, then the state exchange with self is an operating state, and broadcasting redundance unit state switches message in network;
Receive the equipment of described switching message in the network, be used for with the communicating to connect of described working equipment, be updated to and the communicating to connect of described alternate device.
Wherein, the alternate device of described working equipment is Liang Tai and two when above, after each alternate device is broadcasted self in network redundance unit state switches message,
Alternate device also was used at equipment redundancy in switching time, received the described switching message in the network, and redundant priority is competed out the highest alternate device of priority in the utilization switching message;
Receive the equipment of described switching message, be used for with the communicating to connect of described working equipment, upgrade and the communicating to connect of the highest alternate device of described priority.
Wherein,
Alternate device is used for obtaining the redundant precedence information of described switching message, compares with self redundant priority, judges whether the redundant priority of self is lower than the redundant priority of being obtained,
If be lower than, then self working state is switched to Status of Backups, stop to send described switching message;
If be higher than, then keep operating state.
Wherein,
Receive the equipment of described switching message, be used for obtaining the redundant precedence information of described switching message that receives, the redundant priority in the switching message that receives with the last time compares,
If be lower than the redundant priority in the switching message that the last time receives, then keep former correspondence constant;
If be higher than the redundant priority in the switching message that the last time receives, then upgrade correspondence, until being updated to and the communicating to connect of the highest alternate device of described priority.
Wherein,
Described working equipment and alternate device are used for receiving identical data of network and processing, before the described renewal, and the result after described working equipment execution or transmission are handled, described alternate device is to result's execution or transmission after handling; After the described renewal, the result after handling is carried out or sent to described alternate device.
Wherein,
Described alternate device, in joining network after, also be used for sending redundance unit data synchronization request message to the described working equipment of appointment,
Described working equipment also is used for after receiving described redundance unit data synchronization request message, uses redundance unit data sync message that synchrodata is sent to alternate device in batches.
The solution that method and system of the present invention is desirable the problem of equipment redundancy in the industrial control network, after working equipment broke down, the alternate device under it can start apace, avoids the interruption of production process.For important working equipment, adopt a plurality of alternate devices to back up, after working equipment breaks down,, compete out the work of the working equipment that alternate device unique, that priority is the highest continues to break down by the competition of redundant priority.For normal industrial production provides strong technical guarantee.
Description of drawings
Fig. 1 is the flow chart of embodiments of the invention;
Fig. 2 is the structure chart of industrial control system;
Fig. 3 is the flow chart that sends redundance unit state statement message;
Fig. 4 is the flow chart that the alternate device state switches;
Fig. 5 is a flow chart of competing out unique alternate device;
Fig. 6 is the flow chart that working equipment upgrades correspondence;
Fig. 7 is the schematic diagram that working equipment and alternate device receive network message;
Fig. 8 is the schematic diagram that working equipment and alternate device carry out data sync;
Fig. 9 is the flow chart that working equipment and alternate device carry out data sync.
Embodiment
At first, introduce down key step of the present invention by embodiment, referring to Fig. 1,
Step S101: working equipment is broadcasted redundance unit state statement message in network;
Step S102: in the predetermined cycle, if the alternate device of described working equipment does not receive the statement message from working equipment, then the state exchange with self is an operating state, and broadcasting redundance unit state switches message in network;
Step S103: receive the equipment of described switching message in the network, will with the communicating to connect of described working equipment, be updated to and the communicating to connect of described alternate device.
Below by specific embodiment and be described with reference to the accompanying drawings method and system of the present invention.Referring to Fig. 2, in the industrial control system shown in 2, comprise engineer station, operator station, monitoring station, bridge and field apparatus.Wherein, field apparatus comprises working equipment and alternate device.Bridge waits control appliance to be connected by monitor network with the engineer station with alternate device working equipment.Engineer station, operator station, monitoring station are used to realize the control to field apparatus.Each working equipment all has corresponding alternate device, and as working equipment 1 and alternate device 1, working equipment 5 has two alternate devices, alternate device 5a, 5b.
Field apparatus in control system, configuration module by self is downloaded identical configuration info from network, the data that receive in the network are carried out identical processing, result after working equipment will be handled carries out or sends, alternate device is preserved the result after handling, but the result after handling is not carried out or sends.
Under normal working condition, working equipment is broadcasting redundance unit state statement message in network periodically, and the flow process of broadcasting redundance unit state statement message is referring to Fig. 3,
Step S301: working equipment sends redundance unit state statement message to network;
Step S302: after sending redundance unit state statement message, working equipment judges whether to send once more the cycle of redundance unit state statement message, if do not have, then repeats determining step, if to transmission cycle, then execution in step S301.
Working equipment sends redundance unit state statement message in network after, in the predetermined cycle, if the alternate device as working equipment does not receive described statement message, then alternate device is an operating state with the state exchange of self, and broadcasting redundance unit state switches message in network.
Describing the handoff procedure of alternate device in detail below in conjunction with Fig. 4, is the example explanation with working equipment among Fig. 21, referring to Fig. 4,
Step S401: judge whether to receive redundance unit state statement message;
Alternate device 1 constantly judges self whether to receive redundance unit state statement message, if receive, and execution in step S403 then; If do not receive, execution in step S402 then.
Step S403: alternate device 1 is to the counter O reset of self;
Step S402: after the counter of alternate device 1 is carried out and is added an operation, execution in step S404.
Step S404: judge whether counter institute count value equals threshold value, if be not equal to, execution in step S401 then; If equal, show that then working equipment 1 breaks down execution in step S405; The threshold value of counter is the above-mentioned predetermined cycle of pointing out.
Step S405: the state of alternate device 1 self is set to operating state;
Step S406: alternate device 1 sends the redundance unit state and switches message in network;
The threshold value of counter, promptly Yu Ding cycle is preestablished when the device configuration by the user.
Alternate device 1 sends redundance unit state switching message in network after, other working equipment of communicating by letter with working equipment 1 in the network, as working equipment 2, working equipment 4, working equipment 5 etc., after receiving the redundance unit state switching message of alternate device 1, utilize the communication information in the redundance unit state switching message, will and working equipment 1 between communicate to connect, be updated to and described alternate device 1 between communicate to connect.Communicating to connect of upgrading comprises Internet protocol IP address, communication port etc.
Because some working equipment is relatively important, therefore, more than one of the alternate device of its working equipment, as the working equipment among Fig. 15, its alternate device has 5a, 5b, if alternate device 5a, 5b do not receive the redundance unit state statement message that working equipment 5 sends in the predetermined cycle, show that then working equipment 5 breaks down in the course of the work.For Liang Tai and the alternate device more than two, in switching time, compete out the highest alternate device of priority at equipment redundancy by predefined redundant priority, the alternate device of competing out is at last carried out the original operation with its relevant work equipment.Equipment redundancy switching time is meant alternate device when not receiving for the first time redundance unit state statement message, and to competing out unique alternate device, this alternate device in working order and broadcast time between the redundance unit state switching message.If have only an alternate device, referring to then that alternate device switches to operating state and broadcasts the redundance unit state switches time between the message.Belong to the alternate device of working equipment on the same stage, the predefined redundant priority of each alternate device is different, can guarantee to compete out unique the highest alternate device of redundant priority.Describe the process of competing out unique alternate device in detail below in conjunction with Fig. 5.
Step S501: send the redundance unit state and switch message;
With alternate device 5a, 5b among Fig. 2 is the example explanation, working equipment 5 breaks down, in the predetermined cycle, after alternate device 5a, 5b do not receive redundance unit state statement message, the Status of Backups of self is switched to operating state, in network, send the redundance unit state and switch message.
Step S502: the redundance unit state that alternate device 5a, 5b judge whether to receive other alternate device switches message, if do not receive, and execution in step S501 then; If receive, execution in step S503 then.
Step 503: the height of judging priority;
Alternate device is when being linked into network, can preestablish redundant priority, institute's transmission redundance unit state switches the information that carries redundant priority in the message, after alternate device receives the redundance unit state switching message of other alternate device, obtain the information of redundant priority in the message, and compare with self redundant priority.If greater than, then continue to keep operating state, and send the redundance unit state and switch message, if less than, execution in step S504 then, self operating state is set to Status of Backups, and stops to send the redundance unit state and switch message.
Alternate device 5a can receive the redundance unit state switching message that alternate device 5b is sent; Otherwise alternate device 5b also can receive the redundance unit state switching message that alternate device 5a is sent.Alternate device 5a obtains the redundant precedence information in the received switching message, compare than redundant priority with self, after the redundant priority that compares alternate device 5a is higher than the redundant priority of alternate device 5b, continue to keep operating state, and send redundance unit state switching message.
Alternate device 5b obtains the redundant precedence information in the received switching message, compare than redundant priority with self, after the redundant priority that compares alternate device 5b is lower than the redundant priority of alternate device 5a, self working state is set to Status of Backups, and stops to send redundance unit state switching message.
Step S504: self working state is set to Status of Backups.
After each alternate device carries out the comparison of priority, have only the highest alternate device of redundant priority to keep operating state at last, and establish a communications link with other working equipment.
In switching time, each working equipment in the network upgrades correspondence after receiving redundance unit state switching message at equipment redundancy.Because there are a plurality of alternate devices in the working equipment that has, belongs to the alternate device of the working equipment that breaks down, in process of competition, constantly send the redundance unit state and switch message, and and normal working equipment between upgrade correspondence.Therefore, the renewal of correspondence may need repeatedly to finish.Describe the process that correspondence upgrades in detail below in conjunction with Fig. 6.
Step S601: judge whether to receive the redundance unit state and switch message;
Working equipment constantly judges whether to receive the redundance unit state and switches message from network, if receive, and execution in step S502 then; If do not receive, then continue to judge.
Step S602: upgrade correspondence;
After receiving redundance unit state switching message, obtain the address information in the message, upgrade correspondence.
Step S603: in switching time, judge whether to receive once more the redundance unit state and switch message at equipment redundancy; If receive, execution in step S604 then;
Step S604: working equipment obtains the redundant precedence information in the received switching message, and the redundant priority in the switching message that receives with the last time compares.If be higher than the redundant priority in the switching message that the last time receives, then execution in step S602; If be lower than, execution in step S603 then.
As, after working equipment 5 breaks down, alternate device 5a, 5b broadcast the redundance unit state and switch message in network, after other working equipment receives the switching message of alternate device 5b earlier, will be updated to the correspondence with alternate device 5b with the correspondence of working equipment 5.After other normal each working equipment will receive the switching message of alternate device 5a again, by switching the relatively redundant priority of two alternate devices of message, because the redundant priority of alternate device 5a is higher than the redundant priority of redundance unit 5b, therefore, will be updated to correspondence with alternate device 5a with the correspondence of alternate device 5b.
For preventing working equipment in the moment of breaking down, the alternate device under it can replace the operation of fail operation equipment fast, needs to carry out real-time data sync between working equipment and the alternate device.Referring to Fig. 7, working equipment receives identical network message data simultaneously with alternate device, and institute's control appliance is carried out configuration or carries out the control corresponding algorithm according to the network message data that receive, working equipment utilizes the result after algorithm is carried out to carry out corresponding operation, and alternate device is not carried out corresponding operation.
Describe the process of data sync in detail below in conjunction with Fig. 8, Fig. 9.Referring to Fig. 8, alternate device is specified the alternate device as a working equipment after powering on, and sends redundance unit data synchronization request message to this working equipment.Working equipment will use redundance unit data sync message that synchrodata is sent to alternate device in batches behind the redundance unit data synchronization request message that receives the alternate device transmission.
See also Fig. 9, the idiographic flow that working equipment sends synchrodata comprises:
Step S901: working equipment uses redundance unit data sync message that synchrodata is sent to alternate device;
Step S902: judge whether that in addition synchrodata will send, if, execution in step S901 then; Otherwise, finish to send.
Referring to Fig. 2, the present invention also provides the system of equipment redundancy in a kind of industrial control network, comprising:
Working equipment is used for to network broadcasting redundance unit state statement message;
Alternate device was used in the predetermined cycle, if do not receive the statement message from working equipment, then the state exchange with self is an operating state, and broadcasting redundance unit state switches message in network;
Receive the equipment of described switching message in the network, be used for with the communicating to connect of described working equipment, be updated to and the communicating to connect of described alternate device.
In system of the present invention, the alternate device of described working equipment is Liang Tai and two when above, after each alternate device is broadcasted self in network redundance unit state switches message,
Alternate device also was used at equipment redundancy in switching time, received the described switching message in the network, and redundant priority is competed out the highest alternate device of priority in the utilization switching message;
Receive the equipment of described switching message, be used for with the communicating to connect of described working equipment, upgrade and the communicating to connect of the highest alternate device of described priority.
In system of the present invention,
Alternate device is used for obtaining the redundant precedence information of described switching message, compares with self redundant priority, judges whether the redundant priority of self is lower than the redundant priority of being obtained,
If be lower than, then self working state is switched to Status of Backups, stop to send described switching message;
If be higher than, then keep operating state.
In system of the present invention,
Receive the equipment of described switching message, be used for obtaining the redundant precedence information of described switching message that receives, the redundant priority in the switching message that receives with the last time compares,
If be lower than the redundant priority in the switching message that the last time receives, then keep former correspondence constant;
If be higher than the redundant priority in the switching message that the last time receives, then upgrade correspondence, until being updated to and the communicating to connect of the highest alternate device of described priority.
In system of the present invention,
Described working equipment and alternate device are used for receiving identical data of network and processing, before the described renewal, and the result after described working equipment execution or transmission are handled, described alternate device is to result's execution or transmission after handling; After the described renewal, the result after handling is carried out or sent to described alternate device.
In system of the present invention, also comprise process monitoring layer equipment, be used for working equipment and alternate device are controlled and detected, process monitoring layer equipment is engineer station, operator station or monitoring station etc. shown in Figure 2.
For method and system of the present invention, within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (12)
1, the method for equipment redundancy in a kind of industrial control network is characterized in that, comprising:
Working equipment is broadcasted redundance unit state statement message in network;
In the predetermined cycle, if the alternate device of described working equipment does not receive the statement message from working equipment, then the state exchange with self is an operating state, and broadcasting redundance unit state switches message in network;
Receive the equipment of described switching message in the network, will with the communicating to connect of described working equipment, be updated to and the communicating to connect of described alternate device.
2, method according to claim 1 is characterized in that, the alternate device of described working equipment is Liang Tai and two when above, after each alternate device is broadcasted self in network redundance unit state switches message, further comprises:
In switching time, alternate device receives the described switching message in the network at equipment redundancy, and redundant priority is competed out the highest alternate device of priority in the utilization switching message;
Described be updated to described alternate device communicate to connect for:
Receive the equipment of described switching message, will with the communicating to connect of described working equipment, upgrade and the communicating to connect of the highest alternate device of described priority.
3, method according to claim 2 is characterized in that, described competition may further comprise the steps:
Alternate device obtains redundant precedence information in the described switching message, compares with self redundant priority, judges whether the redundant priority of self is lower than the redundant priority of being obtained,
If be lower than, then self working state is switched to Status of Backups, stop to send described switching message;
If be higher than, then keep operating state.
4, method according to claim 2 is characterized in that, receives the equipment of described switching message, upgrade with the highest alternate device of described priority communicate to connect for:
Obtain redundant precedence information in the described switching message that receives, the redundant priority in the switching message that receives with the last time compares,
If be lower than the redundant priority in the switching message that the last time receives, then keep former correspondence constant;
If be higher than the redundant priority in the switching message that the last time receives, then upgrade correspondence, until being updated to and the communicating to connect of the highest alternate device of described priority.
5, method according to claim 1 is characterized in that, this method further comprises:
Working equipment receives data identical in the network with alternate device and handles, and before the described renewal, the result after handling is carried out or sent to described working equipment, and described alternate device is not carried out or sent the result after handling; After the described renewal, the result after handling is carried out or sent to described alternate device.
6, method according to claim 1 is characterized in that, comprises before this method:
After described alternate device joins in the network, described working equipment to appointment sends redundance unit data synchronization request message, described working equipment uses redundance unit data sync message that synchrodata is sent to alternate device in batches behind the redundance unit data synchronization request message that receives the alternate device transmission.
7, the system of equipment redundancy in a kind of industrial control network is characterized in that this system comprises:
Working equipment is used for to network broadcasting redundance unit state statement message;
Alternate device was used in the predetermined cycle, if do not receive the statement message from working equipment, then the state exchange with self is an operating state, and broadcasting redundance unit state switches message in network;
Receive the equipment of described switching message in the network, be used for with the communicating to connect of described working equipment, be updated to and the communicating to connect of described alternate device.
8, system according to claim 7 is characterized in that, the alternate device of described working equipment is Liang Tai and two when above, after each alternate device is broadcasted self in network redundance unit state switches message,
Alternate device also was used at equipment redundancy in switching time, received the described switching message in the network, and redundant priority is competed out the highest alternate device of priority in the utilization switching message;
Receive the equipment of described switching message, be used for with the communicating to connect of described working equipment, upgrade and the communicating to connect of the highest alternate device of described priority.
9, system according to claim 8 is characterized in that,
Alternate device is used for obtaining the redundant precedence information of described switching message, compares with self redundant priority, judges whether the redundant priority of self is lower than the redundant priority of being obtained,
If be lower than, then self working state is switched to Status of Backups, stop to send described switching message;
If be higher than, then keep operating state.
10, system according to claim 8 is characterized in that,
Receive the equipment of described switching message, be used for obtaining the redundant precedence information of described switching message that receives, the redundant priority in the switching message that receives with the last time compares,
If be lower than the redundant priority in the switching message that the last time receives, then keep former correspondence constant;
If be higher than the redundant priority in the switching message that the last time receives, then upgrade correspondence, until being updated to and the communicating to connect of the highest alternate device of described priority.
11, system according to claim 7 is characterized in that,
Described working equipment and alternate device are used for receiving identical data of network and processing, before the described renewal, and the result after described working equipment execution or transmission are handled, described alternate device is to result's execution or transmission after handling; After the described renewal, the result after handling is carried out or sent to described alternate device.
12, system according to claim 7 is characterized in that,
Described alternate device, in joining network after, also be used for sending redundance unit data synchronization request message to the described working equipment of appointment,
Described working equipment also is used for after receiving described redundance unit data synchronization request message, uses redundance unit data sync message that synchrodata is sent to alternate device in batches.
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| CNA2007101017103A CN101047487A (en) | 2007-04-24 | 2007-04-24 | Method and system for solving equipment redundant in industrial control network |
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| CN102291262A (en) * | 2011-09-01 | 2011-12-21 | 中兴通讯股份有限公司 | Disaster recovery method, device and system |
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