CN106789495A - A kind of online changing method of single controller master-slave network bus control unit - Google Patents
A kind of online changing method of single controller master-slave network bus control unit Download PDFInfo
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- CN106789495A CN106789495A CN201611051761.5A CN201611051761A CN106789495A CN 106789495 A CN106789495 A CN 106789495A CN 201611051761 A CN201611051761 A CN 201611051761A CN 106789495 A CN106789495 A CN 106789495A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L12/40169—Flexible bus arrangements
- H04L12/40176—Flexible bus arrangements involving redundancy
- H04L12/40202—Flexible bus arrangements involving redundancy by using a plurality of master stations
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/06—Management of faults, events, alarms or notifications
- H04L41/0654—Management of faults, events, alarms or notifications using network fault recovery
- H04L41/0663—Performing the actions predefined by failover planning, e.g. switching to standby network elements
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Abstract
The invention discloses a kind of online changing method of single controller master-slave network bus control unit, bus current controller CtrlorcurrentTo slave station CtrlorcandidateSend controller handover request message；CtrlorcandidateTo CtrlorcurrentController handoff request acknowledgment message is replied, t is waiteddelay1Afterwards, itself is switched into bus control unit；CtrlorcurrentReceive after handoff request acknowledgment message, oneself is switched into slave station；CtrlorcandidateTo the Ctrlor for having switched to slave stationcurrentSwitching good news is sent, and waits tdelay2Afterwards, Ctrlor is readcurrentReply message, if replying mark effectively, switch successfully, otherwise, CtrlorcandidateAgain oneself is cut to slave station；CtrlorcurrentIn default TswitchCtrlor is received in timecandidateThe bus control unit switching good news sent, then set waits bus control unit to take, does not receive after replying mark, then bus control unit, record switching times oneself will be switched to add 1, repeat handoff procedure again；Can not still succeed until repeating n times, then bus failure of alarming terminates handoff procedure.The present invention is simple and easy to apply, reliable and stable.
Description
Technical field
The present invention relates to a kind of online changing method of single controller master-slave network bus control unit, can be used for solution and adopt
With the problem of the distributed system of master-slave mode bus architecture bus switching at runtime in the process of running.
Background technology
With module design and the development and popularization of distributed computing technology, using bus come the method for constructing system solution
Become increasingly prevalent, large industry equipment control system, intelligent monitor system that multiple spot is deployed to ensure effective monitoring and control of illegal activities and aerospace field etc.
Bus will be used.It is total that bussing technique can be divided into star bus, daisy chain structure bus, loop configuration according to topological structure
Line, master-slave mode bus, arbitration formula bus, peer-to-peer bus etc. can be divided into according to the distribution of bus control right.Wherein master-slave mode
Bus is in stability requirement system higher using relatively broad.
In the system with master-slave mode bus network as logical topological structure, in system operation according to systemic-function and
The conversion of state, it is often desirable to being capable of adaptive optimization offered load amount and localization load distribution, in good time distributed network data
Exchange capacity is distributed.Bus control unit according to power and energy switching at runtime master-slave mode bus is one kind side for realizing this target
Formula.
The switching of the controller of single controller master-slave mode bus would generally influence proper communication, in order to avoid in communication process
Unexpected message cause the abnormal operation of each equipment in system, or even system is caused harm, it usually needs power-off, Ran Houtong
Cross change configuration software mode reconfigure new bus control unit after be powered back up again.
In order to improve the efficiency of system work, a small number of more advanced system schemas realize the automatic of bus control unit and cut
Change technology.Current existing automatic switchover scheme often notifies standby using " being laid off after order " pattern, i.e. Current bus controller
After selecting bus control unit to switch, the identity of bus slave website oneself is switched to, alternative bus control unit is receiving bus marco
After device handover request, bus control unit oneself will be switched to, then handoff procedure terminates.And this process typically can not be fault-tolerant
, such as communicating, controller website attribute handoff procedure etc. may all cause the unsuccessful of switching.In handoff failure, generally
Can cause without controller in bus, bus is mourned in silence, and in this case, due to without any information transfer, causing to set in bus
Meter person cannot further be diagnosed to the malfunction of system.Further scheme is sent communication by standby guarantor
Reliability increases, but this scheme can not solve the situation of website handoff failure, so also without asking of avoiding bus from mourning in silence
Topic.
The content of the invention
Technology solve problem of the invention is：Overcome the deficiencies in the prior art, it is proposed that a kind of bus control unit switching is lost
The highly reliable online changing method of bus control unit of silent status will not be entered when losing.
Technical solution of the invention is：A kind of online changing method of single controller master-slave network bus control unit,
The method is comprised the following steps:
(1), Current bus controller CtrlorcurrentTo the website Ctrlor that will switch to bus control unitcandidate
Send controller handover request message；
(2)、CtrlorcandidateReceiving CtrlorcurrentAfter the controller handover request message sent, to
CtrlorcurrentController handoff request acknowledgment message is replied, t is then waiteddelay1Afterwards, itself is switched into bus control unit；
(3)、CtrlorcurrentReceiving CtrlorcandidateAfter the controller handoff request acknowledgment message of transmission, will be from
Oneself switches to slave station；
(4)、CtrlorcandidateAfter bus control unit is switched to, to the Ctrlor for having switched to slave stationcurrent
Switching good news is sent, and waits tdelay2Afterwards, Ctrlor is readcurrentReply message, if replying mark effectively, switch to
Work(, terminates handoff procedure, otherwise, CtrlorcandidateAgain by oneself switchback slave station；
(5)、CtrlorcurrentAfter oneself is cut into slave station, in default TswitchIn time period, if receiving
CtrlorcandidateThe bus control unit sent as bus control unit switches good news, then the reply mark during set is replied message
Will, transmission waits bus control unit to take after replying message, if default TswitchAfter time, do not receive also
CtrlorcandidateThe bus control unit switching good news and switching times sent as bus control unit are then weighed less than or equal to N
It is new that bus control unit, record switching times oneself will be switched to add 1, repeat step (1)~step (5), when switching times are more than N
When, bus failure of alarming terminates handoff procedure.
In bus control unit handoff procedure, controller handover request message, controller handoff request acknowledgment message, switching
Good news is by repeatedly sending the controller handoff failure to avoid communication error from causing.
The tdelay1It is CtrlorcurrentThe reference time length of bus slave website is switched to from bus control unit；It is described
TswitchIt is CtrlorcandidateThe reference time length of bus control unit is switched to by bus slave website；The tdelay2To have cut
It is changed to the Ctrlor of bus slave websitecurrentThe reference time length that bus slave website has switched Status Flag is put.
The CtrlorcurrentReference time length, the Ctrlor of bus slave website are switched to from bus control unitcandidate
The reference time length of bus control unit is switched to by bus slave website, the Ctrlor of bus slave website has been switched tocurrent
Put bus slave website and switched the actual execution time that the reference time length of Status Flag obtained by statistical test and obtained,
The testing time is more than 5000 times.
The specific statistical method of each reference time length is：To test the actual execution time for obtaining as sample, benchmark is taken
The median of the corresponding sample data of duration increases each as the reference time length required value on the basis of reference time length required value
The end value of each reference time length is worth to from 3 times of statistical sample standard deviation.
Compared with the prior art, the invention has the advantages that：
(1), the present invention using handoff failure Autonomous test and the function that retries considerably increase bus switch stability and
Reliability, and it can complete the handoff procedure of bus control unit in the case where the system of holding bus functionality runs well, and make
Whole handoff procedure to other website transparences in bus, the characteristics of based on master-slave mode bus, the institute in master-slave mode bus
There is slave station when communication is needed, which website without knowing in bus is bus control unit, only there need to be bus control unit
For it is serviced, its availability is substantially increased.
(2), after controller switching problem process logicnprocessing of the present invention on to master-slave mode bus, obtain as far as possible
A bus control unit changing method that logically can be closed to fault self-recovery, avoid bus from mourning in silence is obtained, work as bus control unit
During handoff failure, bus can't enter silent status.
(3), the present invention by asking to confirm, failure rollback the means such as retries and avoids because switching action performs sequential mistake
Multi-controller competition or the generation without abnormalities such as controllers in bus caused by position, bus control unit handoff failure etc..
(4), the present invention by test switching result, again switching etc. method realize in the case where there is handoff failure,
Can again be switched and retried unsuccessfully rear and alarm, extra noise communication will not be produced to disappear in this process
Breath or error communications message, reduce the probability that system breaks down during bus switch.
(5), of the invention switching by controller involved in multiple, standby guarantor's transmission bus control unit handoff procedure is asked
Message is sought, controller handoff request acknowledgment message switches good news, with the controller handoff failure for avoiding communication error from causing,
Improve the success rate of controller switching.
(6), the present invention is by tdelay1Design avoid in bus and the competition of two controllers occur and cause communication to be lost
Lose the function false-alarm problem for causing；
(7), the present invention is by TswitchDesign avoid bus for a long time in silent status, influence other websites
The real-time of communication, maintain other websites it is still online in handoff procedure the characteristics of；
(8), the present invention passes through tdelay2Design contained former bus control unit because of initialization internal memory, task scheduling etc. its
The status flag time delay that his functional bands are come, so as to ensure that the order of final response sequential, it is to avoid new bus control unit
Switchback bus slave website is missed again.
(9), the present invention is according to law of great number and Normal Distribution Theory, and each fiducial time acquisition methods of the invention are resonable
Fall in estimation range by can above ensure real data 99.7%, improve the accuracy of estimation time, so as to solve
Due to estimated time inaccurate caused timing skew, cause the problem of failure and false-alarm.
Brief description of the drawings
Fig. 1 is processing procedure schematic diagram of the invention；
Specific embodiment
Below by taking MILSTD1553B bus systems as an example, the present invention is carried out in detail with reference to the drawings and specific embodiments
Explanation.
MILSTD1553B data/address bus has bidirectional output characteristic, and real-time and reliability are high, is widely used in the present age
On transporter and a considerable amount of airline carriers of passengers and military aircraft, aerospace system is also widely applied this bus.1553B is total
Linear system system is mainly made up of 3 parts：Bus control unit BC；Remote terminal RT；Bus monitor BM.The work of 1553B buses is frequently
Rate is 1Mb/s.Using Manchester II yards, half-duplex operation.Main hardware part is for bus control unit (BC) and remotely
Terminal (RT), bus monitor (BM) is used as optional equipment.Generally, this 3 part passes through 1 multiple bus interface
(MBI) complete.MBI can be embedded in computer.The bus have 10 in message format.Each message comprises at least 2 words (life
Word and status word are made, without data word), each message can include 32 data words.Each word of message has 16 message digits,
The synchronous head of 1 parity check bit and 3 each bit lengths.1553B buses are typical time-devision system command/response formula multiplexed datas
Bus, i.e. master-slave network bus, the data transmitted in bus are dispatched by BC, and each remote end station RT will send
Message be ready to after, be put into fixed transmission buffering area, which letter decided when to send and be sent to by BC
Place, after BC can will take out message in the transmission buffering area of information source RT websites, that puts into stay of two nights RT receives buffering area, or
BC directly obtains message directly as the stay of two nights, so as to realize a communication process.It is of the invention to be by choose 1553B buses structure
In system, the handoff procedure of bus control unit BC further illustrates the implementation process of the method for the invention.
Embodiment selects the microprocessor of compatible 61580 chip functions as the chip of realizing of 1553B bus websites, including
BC and RT, is free of BM websites in bus.Each RT website in bus is received into total line traffic control that Current bus controller BC sends
The subaddressing of device handover request processed is designed as 5, the subaddressing design of each station replies BC bus control unit handover request message
It is 4, each website indicates the confirmation message transmission subaddressing for itself being switched to RT states from BC states and is designed as 9, each station
The reception subaddressing that the sign of point reception other websites transmission itself has completed the confirmation message for being switched to BC by RT is designed as
10, in this way, any RT websites in bus can be switched into BC at any time.Define bus control unit handover request form
For：
Will be detailed below in the course of the work, bus control unit BC being switched into RT5, and by the RT10 in former bus
Switch to the process of new bus control unit BC.The handoff procedure will be comprised the following steps：
(1), Current bus controller BC sends to the reception subaddressing 5 of the website RT10 that will switch to bus control unit
Controller handover request message, the data word of message includes { 0xA5F0,0xAAAA, 0x0005,0x5438 }, then by circulation
The subaddressing 4 of RT10 is inquired about to check whether RT10 sends the response message for acknowledging receipt of controller handover request；
(2), RT10 receives the controller handover request message that BC sends by way of 1553B bus chips are interrupted
Afterwards, the target RT site addresses that will switch of identification BC are 5, then by controller handoff request acknowledgment message 0xA5F0,
0x5555,0x0000,0x8214 } transmission subaddressing 4 wait BC is placed on to take, after BC takes response message away, by transmission
Address resets, and waits tdelay1=3s, itself will switch to bus control unit BC.
(3), BC starts the 1553B chips of oneself after the controller handoff request acknowledgment message for receiving RT10 transmissions
RT5 is initialized as, the design to above-mentioned steps herein avoids RT10 and do not switch due to not receiving handover request
Into the failure of BC websites；
(4), RT10 is after BC is switched to, to the subaddressing 10 of RT5 send switching good news 0xA5F0,0xF0F0,
0x0000,0x4556 }, and wait tdelay2RT5 during RT5 sends subaddressing 9 is read after=500ms to confirm to switch to RT by BC
Reply message { 0xA5F0,0xFF00,0x0000,0x1568 }, if it is effective to reply mark, switch successfully, otherwise again will
Oneself is cut to RT10；tdelay2To have switched to the Ctrlor of bus slave websitecurrentBus slave website has been put to switch
The fiducial time length of Status Flag.This fiducial time length is according to the processing speed of controller and the task scheduling of Current software
Measure to determine, 100ms is taken herein.This step is mainly used in RT10 and informs former BC websites, now oneself successful switch be total
Line traffic control website, after former BC websites (i.e. present RT5 websites) receive the confirmation message that incumbent BC websites (former RT10) send,
Can confirm that successful switch, to BC websites, the switching of BC websites is performed this procedure avoids due to RT10 to original RT10 websites
During break down and cause BC websites to switch unsuccessful problem.If due to communication failure, causing former BC websites (i.e. present
RT5 websites) when not receiving the confirmation message that incumbent BC websites (former RT10) send, then need that itself is switched RT10 website shapes again
State, waits original BC websites to complete BC website handoff functionalities again again.
(5), original BC is by oneself after RT5 is cut to, time delay Tswitch=3s, in delay time section, equally with 1553B cores
Bus control unit switching good news that the BC to be received such as mode that piece is interrupted sends 0xA5F0,0xF0F0,0x0000,
0x4556 }, if receiving the bus control unit switching good news that BC sends, put and fill out in the buffering area of transmission subaddressing 10 by oneself
Write and represent that the state for itself having completed to be switched to RT from BC replies message { 0xA5F0,0xFF00,0x0000,0x1568 }, etc.
Treat BC to take, if more than TswitchAfter=3s the times, Ctrlor is not received alsocandidateThe total line traffic control sent as bus control unit
Device processed switches good news and switching times are less than or equal to N, then bus control unit, record switching times oneself will be switched to add again
1, repeat step (1)~step (5)；When switching times are more than N, N >=1, such as：N takes 3, N alarm bus failures, terminates switching
Process.The meaning of this step is, if the BC for not receiving incumbent BC websites (i.e. original RT10 websites) transmission has switched confirmation message
When, then it is assumed that former RT10 there occurs problem during switching to BC websites, and now bus is in without BC states, therefore will be from
Oneself switches back into BC websites again, and the traffic control of bus is performed again, reattempts to the handoff functionality for completing bus B C.This process
If still there is failure after retrying n times, that is, think that the system failure cannot be recovered, output alarm waits troubleshooting.
The tdelay1It is CtrlorcurrentThe reference time length of bus slave website is switched to from bus control unit；It is described
TswitchIt is CtrlorcandidateThe reference time length of bus control unit is switched to by bus slave website；The tdelay2To have cut
It is changed to the Ctrlor of bus slave websitecurrentThe reference time length that bus slave website has switched Status Flag is put.
The CtrlorcurrentReference time length, the Ctrlor of bus slave website are switched to from bus control unitcandidate
The reference time length of bus control unit is switched to by bus slave website, the Ctrlor of bus slave website has been switched tocurrent
Put bus slave website and switched the actual execution time that the reference time length of Status Flag obtained by statistical test and obtained,
The testing time is more than 5000 times, and specific statistical method is：To test the actual execution time for obtaining as sample, benchmark is taken
The median of the corresponding sample data of duration increases each as the reference time length required value on the basis of reference time length required value
The end value of each reference time length is worth to from 3 times of statistical sample standard deviation.
Above-mentioned each reference time length obtains statistical method and sets up on the basis of law of great number and Normal Distribution Theory, Ke Yibao
The 99.7% of card real data falls in estimation range, the accuracy of estimation time is improve, during so as to solving due to estimating
Between it is inaccurate caused by timing skew, cause the problem of failure and false-alarm.
In order to improve the success rate of controller switching, in bus control unit handoff procedure, controller handover request message,
Controller handoff request acknowledgment message, switching good news can avoid accidental bus communication from disturbing event by repeatedly sending
The controller handoff failure that barrier causes.
The non-detailed description of the present invention is known to the skilled person technology.
Claims (5)
1. a kind of online changing method of single controller master-slave network bus control unit, it is characterised in that comprise the following steps:
(1), Current bus controller CtrlorcurrentTo the website Ctrlor that will switch to bus control unitcandidateSend
Controller handover request message；
(2)、CtrlorcandidateReceiving CtrlorcurrentAfter the controller handover request message sent, to Ctrlorcurrent
Controller handoff request acknowledgment message is replied, t is then waiteddelay1Afterwards, itself is switched into bus control unit；
(3)、CtrlorcurrentReceiving CtrlorcandidateAfter the controller handoff request acknowledgment message of transmission, oneself is switched
It is slave station；
(4)、CtrlorcandidateAfter bus control unit is switched to, to the Ctrlor for having switched to slave stationcurrentTransmission is cut
Message is finished changing, and waits tdelay2Afterwards, Ctrlor is readcurrentReply message, if replying mark effectively, switch successfully, terminate
Handoff procedure, otherwise, CtrlorcandidateAgain by oneself switchback slave station；
(5)、CtrlorcurrentAfter oneself is cut into slave station, in default TswitchIn time period, if receiving
CtrlorcandidateThe bus control unit sent as bus control unit switches good news, then the reply mark during set is replied message
Will, transmission waits bus control unit to take after replying message, if default TswitchAfter time, do not receive also
CtrlorcandidateThe bus control unit switching good news and switching times sent as bus control unit are then weighed less than or equal to N
It is new that bus control unit, record switching times oneself will be switched to add 1, repeat step (1)~step (5), when switching times are more than N
When, bus failure of alarming terminates handoff procedure.
2. a kind of online changing method of single controller master-slave network bus control unit according to claim 1, its feature
It is：In bus control unit handoff procedure, controller handover request message, controller handoff request acknowledgment message switches
Message is by repeatedly sending the controller handoff failure to avoid communication error from causing.
3. a kind of online changing method of single controller master-slave network bus control unit according to claim 1, its feature
It is：The tdelay1It is CtrlorcurrentThe reference time length of bus slave website is switched to from bus control unit；The Tswitch
It is CtrlorcandidateThe reference time length of bus control unit is switched to by bus slave website；The tdelay2To have switched to
The Ctrlor of bus slave websitecurrentThe reference time length that bus slave website has switched Status Flag is put.
4. a kind of online changing method of single controller master-slave network bus control unit according to claim 3, its feature exists
In：The CtrlorcurrentReference time length, the Ctrlor of bus slave website are switched to from bus control unitcandidateBy bus
Slave station switches to the reference time length of bus control unit, has switched to the Ctrlor of bus slave websitecurrentPut total
The actual execution time that the reference time length that line slave station has switched Status Flag is obtained by statistical test is obtained, the survey
Examination number of times is more than 5000 times.
5. a kind of online changing method of single controller master-slave network bus control unit according to claim 4, its feature exists
It is in each specific statistical method of reference time length：To test the actual execution time for obtaining as sample, reference time length pair is taken
The median of the sample data answered increases each statistics as the reference time length required value on the basis of reference time length required value
3 times of sample standard deviation are worth to the end value of each reference time length.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108199939A (en) * | 2017-11-29 | 2018-06-22 | 山东航天电子技术研究所 | A kind of restructural satellite Integrated Electronic System |
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| CN106789495B (en) | 2019-08-09 |
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