CN103986601B - A kind of message transmissions time delay acquisition methods and device - Google Patents
A kind of message transmissions time delay acquisition methods and device Download PDFInfo
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- CN103986601B CN103986601B CN201410207297.9A CN201410207297A CN103986601B CN 103986601 B CN103986601 B CN 103986601B CN 201410207297 A CN201410207297 A CN 201410207297A CN 103986601 B CN103986601 B CN 103986601B
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Abstract
The invention discloses a kind of message transmissions time delay acquisition methods and device, its method is, obtain the first clock information that receiving port receives communication packet, and sending port sends the second clock information of above-mentioned communication packet, according to first clock information, second clock information, it is determined that the propagation delay time of communication packet in a switch in a switch.Using above-mentioned technical proposal; specified location of the interchanger in communication packet adds corresponding timestamp information; and according to the timestamp information; determine the communication packet propagation delay time of corresponding communication packet in a switch during interchanger local transmission; in the case of industry measurement and control system and synchronisation source step-out; it still is able to conveniently determine the propagation delay time of communication packet in a switch, so as to ensure that the error protection and failure detection result accuracy to equipment in industry measurement and control system.
Description
Technical field
The present invention relates to communication technical field, more particularly to a kind of message transmissions time delay acquisition methods and device.
Background technology
At present, in industry measurement and control system, exemplified by intelligent Substation System, when any in intelligent Substation System
When one equipment breaks down, the sampling apparatus in intelligent Substation System can be according to the sampled data generation SV related to failure
(Sampled Value；Sampling value) message, and SV messages are transmitted to protection device by switch network.
Based on the limitation of existing switched network performance, there is propagation delay time, that is, protect in transmission of the SV messages in exchange network
Protection unit will be later than transformer at the time of receiving SV messages and send SV messages.Therefore, in intelligent Substation System or
The corresponding synchronisation source of intelligent Substation System is additionally provided with outside intelligent Substation System, for ensureing the sampling that transformer is obtained
The synchronism of data.Specifically, protection device can be local to protection device according to the clock information of synchronisation source according to predetermined period
Clock information is calibrated, after protection device receives SV messages, that is, obtains the sampled data carried in the SV messages, and
According to the corresponding acquisition time of the sampled data carried in SV messages, the time of failure of faulty equipment is determined, so that pair event
Hinder equipment and perform corresponding operation.Special, when the corresponding synchronisation source failure of intelligent Substation System, due to that can not determine to hand over
Switching network transmits propagation delay time corresponding during SV messages, therefore, can not judge to use when protection device receives SV messages
The synchronism of data, based on the setting of existing intelligent substation, above-mentioned protection device will move out operation, so as to be unfavorable for intelligent change
The protection and fault detect of equipment in electric power station system.
Similarly, it is also to GOOSE using the above method in the industry measurement and control system by taking intelligent industrial TT＆C system as an example
(Generic Object Oriented Substation Event, towards the transformer substation case of general object) message is passed
Defeated, therefore, protection device can not equally determine the propagation delay time of GOOSE message in a switch.
In addition, for some industry communications protocols as communication packet, such as：Profinet (industry of real-time certainty with
Too fidonetFido) propagation delay time that is transmitted in a switch can not equally determine.
In summary, at present in industry measurement and control system is included in, because the communication packet that can not obtain exchange network exists
Propagation delay time in interchanger, causes that fault detect can not be carried out to equipment in industry measurement and control system and error protection is asked
Topic.
The content of the invention
The embodiment of the present invention provides a kind of message transmissions time delay acquisition methods and device, to solve at present in industrial measurement and control
In system, the problem of fault detect and error protection can not be carried out to equipment in industry measurement and control system by existing.
Concrete technical scheme provided in an embodiment of the present invention is as follows：
A kind of message transmissions time delay acquisition methods, applied in industry measurement and control system, the industry measurement and control system is comprising extremely
A few interchanger, methods described includes：
After it is determined that the receiving port of the interchanger receives communication packet, the specified location in the communication packet
Add corresponding first clock information of clock source of the interchanger；Wherein, first clock information is chain-circuit time delay and institute
State the absolute value of difference at the time of receiving port receives the communication packet；
After it is determined that the sending port of the interchanger gets the communication packet of the first clock information of addition, it is determined that described
The corresponding second clock information of clock source；Wherein, the second clock packet gets the addition containing the sending port
At the time of the communication packet of first clock information；Or, the second clock packet gets described containing the sending port
At the time of adding the communication packet of the first clock information and the clock source reversion number of times；
According to first clock information carried in the communication packet, and the second clock information, institute is obtained
State propagation delay time of the communication packet in the interchanger.
Optionally, the size also carried in the communication packet between first current time and the chain-circuit time delay is closed
System, the size at clock source moment corresponding with the half at the clock source recordable maximum moment at first current time is closed
System, and the size at chain-circuit time delay clock source moment corresponding with the half at the clock source recordable maximum moment are closed
System；When the second clock information only included for the second current time, it is less than the chain-circuit time delay when first current time,
When the chain-circuit time delay is less than the clock source moment more than the clock source moment, and second current time, institute is calculated
Stated for the second current time with the first clock information sum as initial correspondence message transmissions time delay, if the initial correspondence report
Literary propagation delay time is less than the clock source recordable maximum moment, then regard the initial correspondence message transmissions time delay as communication
Propagation delay time of the message in the interchanger；It is less than the chain-circuit time delay, the chain-circuit time delay when first current time
Less than the clock source moment, and second current time is when being less than the clock source moment, calculate described second it is current when
Carve and propagation delay time of the first clock information sum as communication packet in the interchanger；When described first is current
Carve and be less than the chain-circuit time delay, the chain-circuit time delay is more than the clock source moment, and second current time is more than described
During the clock source moment, calculating second current time exchanges with the first clock information sum as communication packet described
Propagation delay time in machine；It is less than the chain-circuit time delay when first current time, the chain-circuit time delay is less than the clock source
Moment, and second current time is when being more than the clock source moment, when calculating second current time with described first
Propagation delay time of the clock information sum as communication packet in the interchanger；It is more than the link when first current time
Time delay, first current time is more than the clock source moment, and second current time is less than the clock source moment
When, calculate clock source recordable maximum moment and the difference of first clock information, and obtain the difference with
Propagation delay time of the second current time sum as communication packet in the interchanger；It is more than institute when first current time
Chain-circuit time delay is stated, first current time is more than the clock source moment, and second current time is more than the clock
During the moment of source, the difference of second current time and first clock information is calculated as communication packet in the interchanger
Propagation delay time；It is more than the chain-circuit time delay when first current time, first current time is less than the clock source
Moment, and second current time is when being less than the clock source moment, when calculating second current time with described first
Propagation delay time of the difference of clock information as communication packet in the interchanger；It is more than the link when first current time
Time delay, first current time is less than the clock source moment, and second current time is more than the clock source moment
When, calculate transmission of the difference of second current time and first clock information as communication packet in the interchanger
Time delay.
Optionally, the size also carried in the communication packet between first current time and the chain-circuit time delay is closed
System；When reversion number of times of the second clock packet containing the second current time and the clock source, work as when described first
When the preceding moment is less than the chain-circuit time delay, according to first clock information, second current time, the clock source can be remembered
The maximum moment of record, and the clock source reversion number of times, when obtaining the transmission of the communication packet in the interchanger
Prolong；When being more than the chain-circuit time delay at first current time, according to first clock information, it is described second it is current when
The reversion number of times of quarter, the clock source recordable maximum moment, and the clock source, obtains the communication packet described
Propagation delay time in interchanger.
The first clock information and second clock information obtained using above-mentioned technical proposal, interchanger is according to local
The clock information that provides of clock source, without synchronous with synchronisation source holdings, thus reduce industry measurement and control system and synchronisation source it
Between Signalling exchange, saved system resource.
Optionally, the communication packet is sent to local by the sampling apparatus in the industry measurement and control system, or, it is described
Communication packet is sent to local by other interchangers in the industry measurement and control system.
Further, obtain after the communication packet propagation delay time, generate the communication packet propagation delay time corresponding
Binary system Delay, and the specified location that the binary system Delay is added in the communication packet；Will be described logical
News message sends the protection device into the industry measurement and control system, makes the protection device be carried according in the communication packet
Sampled data corresponding protection performed to faulty equipment operate.
A kind of message transmissions time delay acquisition device, applied in industry measurement and control system, the industry measurement and control system is comprising extremely
A few interchanger, described device includes：
Writing unit, for after the receiving port for determining the interchanger receives communication packet, in the communication report
Specified location in text adds corresponding first clock information of clock source of the interchanger；Wherein, first clock information
The absolute value of difference at the time of receiving the communication packet for chain-circuit time delay and the receiving port；
Clock information acquiring unit, for getting the first clock information of addition when the sending port for determining the interchanger
Communication packet after, determine the corresponding second clock information of the clock source；Wherein, the second clock packet contains the hair
At the time of sending end mouth gets the communication packet of the first clock information of the addition；Or, the second clock packet contains institute
State sending port get it is described addition the first clock information communication packet at the time of and the clock source reversion number of times；
Propagation delay time acquiring unit, for according to first clock information carried in the communication packet, Yi Jisuo
Second clock information is stated, propagation delay time of the communication packet in the interchanger is obtained.
Optionally, the propagation delay time acquiring unit, specifically for：If also carrying described first in the communication packet to work as
When the magnitude relationship between preceding moment and the chain-circuit time delay, first current time and the recordable maximum clock source
The magnitude relationship at the half corresponding clock source moment at quarter, and when the chain-circuit time delay and the recordable maximum clock source
The magnitude relationship at the half corresponding clock source moment at quarter, then when the second clock information only included for the second current time,
If first current time is less than the chain-circuit time delay, the chain-circuit time delay is more than the clock source moment, and described second
Current time is less than the clock source moment, then calculates second current time with the first clock information sum as first
Beginning communication packet propagation delay time, if the initial correspondence message transmissions time delay is less than the clock source recordable maximum moment,
The then propagation delay time using the initial correspondence message transmissions time delay as communication packet in the interchanger；If described first works as
The preceding moment is less than the chain-circuit time delay, and the chain-circuit time delay is less than the clock source moment, and second current time is less than
The clock source moment, then calculate second current time with the first clock information sum as communication packet described
Propagation delay time in interchanger；If first current time is less than the chain-circuit time delay, when the chain-circuit time delay is more than described
The Zhong Yuan moment, and second current time be more than the clock source moment, then calculate second current time and described the
Propagation delay time of the one clock information sum as communication packet in the interchanger；If first current time is less than described
Chain-circuit time delay, the chain-circuit time delay is less than the clock source moment, and second current time is more than the clock source moment,
Then calculate second current time and transmission of the first clock information sum as communication packet in the interchanger
Time delay；If first current time is more than the chain-circuit time delay, first current time is more than the clock source moment, and
Second current time is less than the clock source moment, then calculates the clock source recordable maximum moment and described first
The difference of clock information, and the difference and the second current time sum are obtained as communication packet in the interchanger
Propagation delay time；If first current time is more than the chain-circuit time delay, when first current time is more than the clock source
Carve, and second current time is more than the clock source moment, then calculates second current time and first clock
Propagation delay time of the difference of information as communication packet in the interchanger；If first current time is more than the link
Prolong, first current time is less than the clock source moment, and second current time is less than the clock source moment, then
When calculating the difference of second current time and first clock information as transmission of the communication packet in the interchanger
Prolong；If first current time is more than the chain-circuit time delay, first current time is less than the clock source moment, and institute
Stated for the second current time more than the clock source moment, then calculate the difference of second current time and first clock information
It is used as propagation delay time of the communication packet in the interchanger.
Optionally, the propagation delay time acquiring unit, specifically for：If also carrying described first in the communication packet to work as
Magnitude relationship between preceding moment and the chain-circuit time delay, then when the second clock packet contains the second current time and institute
When stating the reversion number of times of clock source, if first current time is less than the chain-circuit time delay, believed according to first clock
The reversion number of times of breath, second current time, the clock source recordable maximum moment, and the clock source, is obtained
Propagation delay time of the communication packet in the interchanger；If first current time is more than the chain-circuit time delay, root
According to first clock information, second current time, the clock source recordable maximum moment, and when described
Zhong Yuan reversion number of times, obtains propagation delay time of the communication packet in the interchanger.
The first clock information and second clock information obtained using above-mentioned technical proposal, interchanger is according to local
The clock information that provides of clock source, without synchronous with synchronisation source holdings, thus reduce industry measurement and control system and synchronisation source it
Between Signalling exchange, saved system resource.
Optionally, said write unit, is used for：Receive as described in being sent the sampling apparatus in the industry measurement and control system
Communication packet, or, receive the communication packet sent by other interchangers in the industry measurement and control system.
Further, said apparatus also includes transmitting element, is used for：Obtain after the communication packet propagation delay time, give birth to
Lead into the corresponding binary system Delay of the communication packet propagation delay time, and by the binary system Delay added to described
Interrogate the specified location in message；The communication packet is sent into the protection device into the industry measurement and control system, the guarantor is made
Protection unit performs corresponding protection to faulty equipment according to the sampled data carried in the communication packet and operated.
In the embodiment of the present invention, the first clock information that receiving port receives communication packet, and sending port are obtained
The second clock information of above-mentioned communication packet is sent, according to first clock information, second clock information, it is determined that in a switch
The propagation delay time of communication packet in a switch.Using above-mentioned technical proposal, specified location of the interchanger in communication packet adds
Plus corresponding timestamp information, and according to the timestamp information, determine communication packet correspondence during interchanger local transmission
Communication packet propagation delay time in a switch, in the case of industry measurement and control system and synchronisation source step-out, still be able to conveniently
The propagation delay time of communication packet in a switch is efficiently determined, the failure of equipment in industry measurement and control system is protected so as to ensure that
Shield and failure detection result accuracy.
Brief description of the drawings
Fig. 1 is industry measurement and control system configuration diagram in the embodiment of the present invention；
Fig. 2 is the propagation delay time flow chart of acquisition communication packet in a switch in the embodiment of the present invention；
Fig. 3 is switch architecture schematic diagram in the embodiment of the present invention；
Fig. 4 a and Fig. 4 b are SV message schematic diagrames in the embodiment of the present invention；
Fig. 5 is the SV message schematic diagrames after the propagation delay time of addition SV messages in a switch in the embodiment of the present invention；
Fig. 6 is message transmissions time delay acquisition device structural representation in the embodiment of the present invention.
Embodiment
In order to solve at present in intelligent industrial TT＆C system, existing can not be carried out to equipment in intelligent industrial TT＆C system
The problem of fault detect and error protection.In the embodiment of the present invention, when acquisition receiving port receives the first of communication packet
Clock information, and sending port send the second clock information of above-mentioned communication packet, according to first clock information, second clock
Information, it is determined that the propagation delay time of communication packet in a switch in a switch.Using above-mentioned technical proposal, interchanger is in communication
Specified location in message adds corresponding timestamp information, and according to the timestamp information, determines communication packet in interchanger
The propagation delay time of corresponding communication packet in a switch during local transmission, in industry measurement and control system and synchronisation source step-out
In the case of, it still is able to conveniently determine the propagation delay time of communication packet in a switch, so as to ensure that to industrial measurement and control
The error protection and failure detection result accuracy of devices in system.
In this following specific embodiment, what is carried out so that communication packet is SV messages as an example illustrates；Similarly, GOOSE
Message has SV message identical message formats, equally uses, is used for using retention position as specified location in GOOSE message
Bearing message propagation delay time information.In addition, industry communications protocol is as communication packet, such as the data field in Profinet forms
It is not specifically defined, therefore the data area can be used as specified location, for bearing message propagation delay time information.Together
Relevant position can be delimited in reason, other industry communications protocols to use as specified location, can also meet the requirement of the present invention.
Currently preferred implementation is described in detail below in conjunction with the accompanying drawings.
As shown in fig.1, being industry measurement and control system Organization Chart in the embodiment of the present invention, the industry measurement and control system includes failure
Equipment, sampling apparatus, exchange network, and protection device, wherein, the exchange network includes at least one interchanger, Ke Yitong
Each interchanger crossed in exchange network obtains the propagation delay time of the SV messages of itself in a switch, can also be by special
Propagation delay time acquisition device obtain the SV messages propagation delay time in a switch of exchange network.In the embodiment of the present invention, with
Carried out in detail exemplified by obtaining the propagation delay time of the SV messages of itself in a switch by each interchanger in exchange network
Introduce.
As shown in fig.2, in the embodiment of the present invention, the process for obtaining the propagation delay time of SV messages in a switch is：
Step 200：After interchanger determines that local receiving port receives SV messages, the specific bit in the SV messages
Put corresponding first clock information in acquisition local clock source.
As shown in fig.3, in the embodiment of the present invention, interchanger includes receiving port, sending port, exchanging array, and
Clock source.Wherein, receiving port is used to receive SV messages；Sending port is used to send the SV messages to protection device；Clock
Source is used to mark clock information, and the clock source has the recordable maximum moment (being td), when clock source reaches remembering for itself
During the record maximum moment, reversion (restarting timing from 0) occurs for the clock source.
In the embodiment of the present invention, due to including at least one interchanger in the exchange network in industry measurement and control system, therefore,
Above-mentioned SV messages send local to this interchanger by the sampling apparatus in industry measurement and control system；Or, when being included in exchange system
During at least two interchangers, SV messages can also send local to this interchanger by the interchanger of other in industry measurement and control system.
When the SV messages that interchanger is received are sent by sampling apparatus, the chain-circuit time delay of the exchange network carried in above-mentioned SV messages
(being designated as △ t0) is 0；When the SV messages that interchanger is received are sent by other interchangers, the exchange carried in above-mentioned SV messages
The chain-circuit time delay △ t0 of network are not 0, for example, when interchanger 1 receives the SV messages of the transmission of interchanger 0, you can obtain SV reports
The chain-circuit time delay carried in text, the chain-circuit time delay is propagation delay time of the corresponding SV messages of interchanger 1 in interchanger 1.
Based on the interchanger shown in above-mentioned Fig. 3, when detecting receiving port and receiving SV messages, i.e., received from clock source
Port receives the first bit information corresponding first current time in SV messages；Calculate the chain-circuit time delay carried in SV messages
And the absolute value of the difference at the first current time, regard the chain-circuit time delay and the absolute value of the difference at the first current time as the first clock
Specified location in information write-in SV messages.
Refering to shown in Fig. 4 a, being SV message schematic diagrames in the embodiment of the present invention.Optionally, by SV messages
Reserved1 and Reserved2 reserved field adds the first clock information as specified location.Specifically, refering to Fig. 4 b institutes
Show, be a part for SV messages, a part for the SV messages includes 32 bits, wherein, the corresponding position of bit sequence 0~23 is
For the specified location of SV messages, i.e., the first clock information is preserved to the corresponding position of the 1st bit to the 24th bit of SV messages；
The corresponding position of bit sequence 24~29 is the extension bits of SV messages；The corresponding position of bit sequence 30 is the quality of SV messages
Position, when the position is 0 to represent effective, when the position is 1 to represent invalid；The corresponding position of bit sequence 31 is SV messages
Test position.
Optionally, after interchanger obtains the first clock information, first clock information is converted into binary format, and
First clock information of the binary format is stored to above-mentioned specified location；Also, the temporal information stored in the SV messages
In units of nanosecond, due to storing the temporal information comprising 24 bits in the SV messages, therefore, when storable in SV messages
Between maximum time value represented by information be 16.777215 milliseconds (i.e. 224Nanosecond).
Further, the recordable maximum moment td of above-mentioned clock source is preset according to concrete application scene.In order to just
In the simplicity of the propagation delay time acquisition process to SV messages in a switch, preferably, the recordable maximum of above-mentioned clock source
Moment td is equal to the maximum time value represented by storable temporal information in above-mentioned SV messages.
Optionally, above-mentioned first current time (being designated as t1) is also carried in above-mentioned SV messages, chain-circuit time delay △ t0 are with timely
The recordable maximum moment td in clock source, when the SV messages reach sending port, during by above-mentioned first current time t1 and link
Prolong △ t0, chain-circuit time delay △ t0 clock source moment (being designated as td/2) corresponding with the half at clock source recordable maximum moment,
And first corresponding with the half at clock source recordable maximum moment clock source moment td/2 at current time compared respectively
Compared with.Or, after interchanger receiving port receives SV messages, that is, when being respectively compared the first current time t1 of acquisition with link
Prolong △ t0, chain-circuit time delay △ t0 and clock source recordable maximum moment half corresponding clock time td/2, Yi Ji
One current time clock source moment td/2 corresponding with the half at clock source recordable maximum moment, and according to above three ratio
Relatively result generates the bit for the serial number 0~2 that corresponding binary identification is added in SV messages.If for example, t1 ＜ td/2,
Then record ft1=1, if t1 ＞ td/2, record ft1=0；If △ t0 ＜ td/2, record f△t0=1, if △ t0 ＞ td/2,
Record f△t0=0；If t1 ＜ △ t0, record ftMiddle=1, if t1 ＞ △ t0, record ftMiddle=0, wherein, should
TMiddle=| Δ t0-t1 |.As can be seen here, when using above-mentioned technical proposal, if the bit of the serial number 0~2 in SV messages
The corresponding binary identification in position is ftMiddle=1, ft1=1, then it represents that t1 ＞ △ t0, t1 ＜ td/2.Compared to former scheme
In directly by above-mentioned t1, △ t0, t2, and the mode that td/2 is added in SV messages during using latter technique scheme, passes through
Three binary identifications represent to remove above three in t1, △ t0, t2, and the relation between td/2, SV messages in specified location
The first clock information can also be carried outside bit, so as to improve the precision of clock information entrained in SV messages.
Step 210：When interchanger determines that local sending port gets the SV messages of the above-mentioned clock information of addition first
Afterwards, the corresponding second clock information of clock source is determined.
In the embodiment of the present invention, when interchanger determines that above-mentioned SV messages reach local sending port, the transmission is determined
Port gets the second current time of the corresponding clock source of the first bit information in SV messages, and by the second of the clock source
Current time is recorded as second clock information；Or, when interchanger determines that above-mentioned SV messages reach local transmitting terminal
During mouth, determine that sending port gets the second current time of the corresponding clock source of the first bit information in SV messages, and
The reversion number of times of the clock source, and during using the reversion number of times of the second current time of above-mentioned clock source and clock source as second
Clock information is recorded.As can be seen here, above-mentioned second clock information gets SV messages to characterize the sending port of interchanger
The information at the first bit moment；Or, above-mentioned second clock information gets SV messages to characterize the sending port of interchanger
First bit moment, and the corresponding information for inverting number of times of clock source.
The first clock information and second clock information obtained using above-mentioned technical proposal, interchanger is according to local
The clock information that provides of clock source, without synchronous with synchronisation source holdings, thus reduce industry measurement and control system and synchronisation source it
Between Signalling exchange, saved system resource.
Step 220：According to the first clock information carried in above-mentioned SV messages, and second clock information, SV reports are obtained
The propagation delay time of text in a switch.
In the embodiment of the present invention, according to whether, comprising reversion number of times, interchanger obtains SV messages and existed in second clock information
The mode of propagation delay time in interchanger is divided into two kinds：
First way：When in second clock information only include the first clock information when, interchanger according to first it is current when
Carve the second current time (being designated as t2) included in t1, second clock information, and the recordable maximum moment td of clock source, and
Calculate half corresponding clock source moment td/2 at clock source recordable maximum moment；Respectively by above-mentioned first current time t1
With chain-circuit time delay △ t0, chain-circuit time delay △ t0 clock source moment td/ corresponding with the half at clock source recordable maximum moment
2, the first current time t1 clock source moment td/2 corresponding with the half at clock source recordable maximum moment, and second work as
Preceding moment t2 clock source moment td/2 corresponding with the half at clock source recordable maximum moment is compared, can obtain with
Lower eight kinds of comparative results, be according to the process that eight kinds of comparative results obtain the propagation delay time △ t of SV messages in a switch：
The first situation：It is less than chain-circuit time delay when the first current time, chain-circuit time delay is more than the clock source moment, and second works as
When the preceding moment is less than the clock source moment, interchanger calculated for the second current time and the first clock information sum is used as initial SV messages
Propagation delay time, if initial SV message transmissions time delay is less than the clock source recordable maximum moment, during by initial SV message transmissions
Prolong the propagation delay time in a switch as SV messages.If can be expressed as with formula：
As t1 ＜ △ t0, △ t0 ＞ td/2, t2 ＜ td/2, △ t=t2+ | Δ t0-t1 |.
In the first case, due to △ t0 ＞ td/2, t1 ＜ △ t0, and t2 ＜ td/2, therefore, as t1 ＜ td/2,
Show that clock source is not inverted, now, △ t=t2+ | Δ t0-t1 |；As t1 ＞ td/2, show that clock source occurs anti-
Turn, now, according to △ t=t2+ | Δ t0-t1 | the △ t0 of acquisition will be greater than td, if td is equal to 16.777215 milliseconds, due to
The maximum time value that the specified location that td exceeds in SV messages can be represented, therefore, interchanger need to send error reporting prompting
Specified location in SV messages can not represent the propagation delay time of above-mentioned SV messages in a switch.
Second of situation：It is less than chain-circuit time delay when the first current time, chain-circuit time delay is less than the clock source moment, and second works as
When the preceding moment is less than the clock source moment, the second current time of calculating is exchanging with above-mentioned first clock information sum as SV messages
Propagation delay time in machine.If can be expressed as with formula：
As t1 ＜ △ t0, △ t0 ＜ td/2, t2 ＜ td/2, △ t=t2+ | Δ t0-t1 |.
The third situation：It is less than chain-circuit time delay when the first current time, chain-circuit time delay is more than the clock source moment, and second works as
When the preceding moment is more than the clock source moment, the second current time of calculating is exchanging with above-mentioned first clock information sum as SV messages
Propagation delay time in machine.If can be expressed as with formula：
As t1 ＜ △ t0, △ t0 ＞ td/2, t2 ＞ td/2, △ t=t2+ | Δ t0-t1 |.
4th kind of situation：It is less than chain-circuit time delay when the first current time, chain-circuit time delay is less than the clock source moment, and second works as
When the preceding moment is more than the clock source moment, the second current time and above-mentioned first clock information are calculated as SV messages in a switch
Propagation delay time.If can be expressed as with formula：
As t1 ＜ △ t0, △ t0 ＜ td/2, t2 ＞ td/2, △ t=t2+ | Δ t0-t1 |.
5th kind of situation：It is more than chain-circuit time delay when the first current time, the first current time was more than clock source moment, and the
When two current times were less than the clock source moment, obtain and calculate clock source recordable maximum moment and the difference of above-mentioned first clock information
Value, and obtain above-mentioned difference and propagation delay time of the second current time sum as SV messages in a switch.At the 5th kind
In situation, due to t1 ＞ △ t0, t1 ＞ td/2, and t2 ＜ td/2, it is therefore shown that clock source is inverted, if can with formula
To be expressed as：
As t1 ＞ △ t0, t2 ＞ td/2, t2 ＜ td/2, △ t=td- | Δ t0-t1 |+t2.
6th kind of situation：It is more than chain-circuit time delay when the first current time, the first current time was more than clock source moment, and the
When two current times were more than the clock source moment, the difference for calculating the second current time and above-mentioned first clock information exists as SV messages
Propagation delay time in interchanger.If can be expressed as with formula：
As t1 ＞ △ t0, t1 ＞ td/2, t2 ＞ td/2, △ t=t2- | Δ t0-t1 |.
7th kind of situation：It is more than chain-circuit time delay when the first current time, the first current time was less than clock source moment, and the
When two current times were less than the clock source moment, the difference for calculating the second current time and above-mentioned first clock information exists as SV messages
Propagation delay time in interchanger.If can be expressed as with formula：
As t1 ＞ △ t0, t1 ＜ td/2, t2 ＜ td/2, △ t=t2- | Δ t0-t1 |.
8th kind of situation：It is more than chain-circuit time delay when the first current time, the first current time was less than clock source moment, and the
When two current times were more than the clock source moment, the difference for calculating the second current time and above-mentioned first clock information exists as SV messages
Propagation delay time in interchanger.If can be expressed as with formula：
As t1 ＞ △ t0, t1 ＜ td/2, t2 ＞ td/2, △ t=t2- | Δ t0-t1 |.
Because in the first implementation, interchanger is according to t1, △ t0, t2, and the judgement clock source between td/2
Whether invert, therefore, the propagation delay time of the SV messages of above-mentioned acquisition in a switch is not more than td/2.
The second way：When second clock information includes the reversion number of times at the second current time and clock source simultaneously,
Interchanger is according to the first current time t1 included in the first clock information, the second current time included in second clock information
T2, and clock source reversion number of times, compare the first current time t1 and chain-circuit time delay △ t0, following two ratios can be obtained
Relatively result, according to the reversion times N of two kinds of comparative results and clock source, can support the reversion number of times correctly judged here
N depends on the number of bits n reserved in SV messages, and relation is N=2n- 1, obtain the propagation delay time △ of SV messages in a switch
T process is：
The first situation：When being less than chain-circuit time delay at the first current time, according to chain-circuit time delay, the first current time, the
The reversion number of times of two current times, clock source recordable maximum moment, and clock source, obtains SV messages in a switch
Propagation delay time.When in the first case, due to t1 ＜ △ t0, N ＞ 1, show that clock source is inverted.If can be with table with formula
It is shown as：
As t1 ＜ △ t0, when, △ t=td*N+t2+ | Δ t0-t1 |.
In above process, if td is equal to 16.777215 milliseconds, the specified location institute energy exceeded by td in SV messages
The maximum time value of expression, therefore, optionally, is divided into two parts, when a part is used to carry by the specified location of SV messages
Zhong Yuan reversion number of times, another part is used in the case where ensureing the propagation delay time precision of SV messages in a switch, carrying
The propagation delay time of no more than td SV messages in a switch.
Second of situation：When being more than chain-circuit time delay at the first current time, according to chain-circuit time delay, the first current time, the
The reversion number of times of two current times, clock source recordable maximum moment, and clock source, obtains SV messages in a switch
Propagation delay time.If can be expressed as with formula：
As t1 ＞ △ t0, △ t=td*N+t2- | Δ t0-t1 |.
Further, the bit addition of serial number 3~6 represents the mark of the reversion number of times of clock source in SV messages,
For example, when the reversion number of times of clock source is 3 times, then the mark of the reversion number of times of the clock source is 11, by the binary system mark
Know the bit for being added to serial number 3~6 in above-mentioned SV messages.
In second of implementation, the reversion number of times of clock source is represented due to being contained in the specified location of SV messages
Mark, therefore, in this kind of mode, the propagation delay time of SV messages in a switch is no longer limited by td/2.
Further, after interchanger obtains the propagation delay time of SV messages in a switch, generation SV messages are in interchanger
In the corresponding binary system Delay of propagation delay time, and by the binary system Delay be added to SV messages in specific bit
Put；The SV messages are sent into the protection device into industry measurement and control system, protection device are made according to the sampling carried in SV messages
Data perform corresponding protection to faulty equipment and operated.For example, when the first bit of SV messages enters receiving port, recorded
Up to moment t1=193.457101130 second；When the first bit of SV messages is sent from sending port, interchanger record hair
Send moment t2=193.457204970 second；Calculate residence time Δ t=t2-t1=of the SV messages in current SWITCH
103840ns, Δ t values are converted into binary system is：11001010110100000, by above-mentioned binary system Delay by low level to
In high-order SV messages successively shown in Fig. 5.
Using above-mentioned technical proposal, the biography of SV messages in a switch is accurately calculated by adding timestamp in SV messages
Defeated time delay, and the propagation delay time of SV messages in a switch is sent to protection device；Protection device receives SV messages and existed
After propagation delay time in interchanger, local time reference is relied on, the sampling at the multiple intervals received is reduced using MU inherent delays
At the generation moment of data, complete the synchronization process of sampled value.
After technical solution of the present invention, the SV messages propagation delay time precision in a switch that interchanger is obtained for ±
100 nanoseconds (determined, it is impossible to less than 1 microsecond) according to test result；When there is multiple switch in exchange network, multi-exchange
Cascade often jumps time delay and adds up precision for ± 100 nanoseconds (being determined according to test result, it is impossible to less than 1 microsecond)；The technology of the present invention side
Case supports linear speed to be more than or equal to the message (100,000,000/gigabit) of 64 bytes.
Based on above-mentioned technical proposal, as shown in fig.6, the present invention also provides a kind of message transmissions time delay acquisition device, wrap
Include writing unit 60, clock information acquiring unit 61, propagation delay time acquiring unit 62, wherein：
Writing unit 60, for after the receiving port for determining the interchanger receives communication packet, in the communication
Specified location in message adds corresponding first clock information of clock source of the interchanger；Wherein, the first clock letter
Cease the absolute value of the difference at the time of communication packet is received for chain-circuit time delay and the receiving port；
Clock information acquiring unit 61, for getting addition the first clock letter when the sending port for determining the interchanger
After the communication packet of breath, the corresponding second clock information of the clock source is determined；Wherein, the second clock packet is containing described
At the time of sending port gets the communication packet of the first clock information of the addition；Or, the second clock packet contains
At the time of the sending port gets the communication packet of the first clock information of the addition and the clock source reversion time
Number；
Propagation delay time acquiring unit 62, for according to first clock information carried in the communication packet, and
The second clock information, obtains propagation delay time of the communication packet in the interchanger.
Further, said apparatus also includes transmitting element 63, is used for：The communication packet is obtained in the interchanger
Propagation delay time after, generate the corresponding binary system Delay of propagation delay time of the communication packet in the interchanger,
And the specified location that the binary system Delay is added in the communication packet；The communication packet is sent to described
Protection device in industry measurement and control system, makes the protection device according to the sampled data carried in the communication packet to failure
Equipment performs corresponding protection operation.
In summary, in the embodiment of the present invention, when interchanger determines that local receiving port receives sampling value communication report
Wen Hou, corresponding first clock information in specified location addition local clock source in the communication packet；When interchanger determines this
The sending port on ground is received after the communication packet of the above-mentioned clock information of addition first, obtains the corresponding second clock letter of clock source
Breath；According to the first clock information carried in above-mentioned communication packet, and second clock information, obtain communication packet and handed over described
Propagation delay time in changing planes.Using technical solution of the present invention, when specified location addition of the interchanger in communication packet is corresponding
Between stab information, and according to the timestamp information, determine communication packet corresponding communication packet during interchanger local transmission
Propagation delay time in the interchanger, in the case of industry measurement and control system and synchronisation source step-out, still is able to conveniently
Propagation delay time of the communication packet in the interchanger is determined, so as to ensure that the error protection to equipment in industry measurement and control system
And failure detection result accuracy.
It should be understood by those skilled in the art that, embodiments of the invention can be provided as method, system or computer program
Product.Therefore, the present invention can be using the reality in terms of complete hardware embodiment, complete software embodiment or combination software and hardware
Apply the form of example.Moreover, the present invention can be used in one or more computers for wherein including computer usable program code
The computer program production that usable storage medium is implemented on (including but is not limited to magnetic disk storage, CD-ROM, optical memory etc.)
The form of product.
The present invention is the flow with reference to method according to embodiments of the present invention, equipment (system) and computer program product
Figure and/or block diagram are described.It should be understood that can be by every first-class in computer program instructions implementation process figure and/or block diagram
Journey and/or the flow in square frame and flow chart and/or block diagram and/or the combination of square frame.These computer programs can be provided
The processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing devices is instructed to produce
A raw machine so that produced by the instruction of computer or the computing device of other programmable data processing devices for real
The device for the function of being specified in present one flow of flow chart or one square frame of multiple flows and/or block diagram or multiple square frames.
These computer program instructions, which may be alternatively stored in, can guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works so that the instruction being stored in the computer-readable memory, which is produced, to be included referring to
Make the manufacture of device, the command device realize in one flow of flow chart or multiple flows and/or one square frame of block diagram or
The function of being specified in multiple square frames.
These computer program instructions can be also loaded into computer or other programmable data processing devices so that in meter
Series of operation steps is performed on calculation machine or other programmable devices to produce computer implemented processing, thus in computer or
The instruction performed on other programmable devices is provided for realizing in one flow of flow chart or multiple flows and/or block diagram one
The step of function of being specified in individual square frame or multiple square frames.
, but those skilled in the art once know basic creation although preferred embodiments of the present invention have been described
Property concept, then can make other change and modification to these embodiments.So, appended claims are intended to be construed to include excellent
Select embodiment and fall into having altered and changing for the scope of the invention.
Obviously, those skilled in the art can carry out various changes and modification without departing from this hair to the embodiment of the present invention
The spirit and scope of bright embodiment.So, if these modifications and variations of the embodiment of the present invention belong to the claims in the present invention
And its within the scope of equivalent technologies, then the present invention is also intended to comprising including these changes and modification.
Claims (10)
1. a kind of message transmissions time delay acquisition methods, applied in industry measurement and control system, it is characterised in that the industrial measurement and control system
System includes at least one interchanger, and methods described includes：
After it is determined that the receiving port of the interchanger receives communication packet, the specified location addition in the communication packet
Corresponding first clock information of clock source of the interchanger；Wherein, first clock information is that chain-circuit time delay connects with described
The absolute value of difference at the time of receiving end mouth receives the communication packet；
After it is determined that the sending port of the interchanger gets the communication packet of the first clock information of addition, the clock is determined
The corresponding second clock information in source；Wherein, the second clock packet gets the addition first containing the sending port
At the time of the communication packet of clock information and the clock source reversion number of times；Wherein, the reversion frequency table of the clock source
Show, the clock source reaches the number of times at the recordable maximum moment of itself；Wherein, the clock source recordable maximum moment is equal to
Maximum time value in the communication packet represented by storable temporal information；Three two are also carried in the communication packet to enter
System mark, wherein, three binary identifications are obtained in the following manner：When the communication packet reaches sending port
When, or, after the receiving port of interchanger receives the communication packet, it is respectively compared the first current time and the link
Magnitude relationship between time delay, when first current time is corresponding with the half at the clock source recordable maximum moment
The magnitude relationship at Zhong Yuan moment, and the chain-circuit time delay it is corresponding with the half at the clock source recordable maximum moment when
The magnitude relationship at Zhong Yuan moment, and generate corresponding binary identification according to three comparative results；
According to first clock information carried in the communication packet, and the second clock information, obtain described logical
Interrogate propagation delay time of the message in the interchanger.
2. the method as described in claim 1, it is characterised in that when the second clock information only included for the second current time
When, according to first clock information carried in the communication packet, and the second clock information, obtain the communication
Propagation delay time of the message in the interchanger, is specifically included：
It is less than the chain-circuit time delay when first current time, the chain-circuit time delay is more than the clock source moment, and described
When second current time was less than the clock source moment, second current time and the first clock information sum work are calculated
For initial correspondence message transmissions time delay, if the initial correspondence message transmissions time delay be less than the clock source it is recordable maximum
Carve, then the propagation delay time using the initial correspondence message transmissions time delay as communication packet in the interchanger；
It is less than the chain-circuit time delay when first current time, the chain-circuit time delay is less than the clock source moment, and described
When second current time was less than the clock source moment, second current time and the first clock information sum work are calculated
For propagation delay time of the communication packet in the interchanger；
It is less than the chain-circuit time delay when first current time, the chain-circuit time delay is more than the clock source moment, and described
When second current time was more than the clock source moment, second current time and the first clock information sum work are calculated
For propagation delay time of the communication packet in the interchanger；
It is less than the chain-circuit time delay when first current time, the chain-circuit time delay is less than the clock source moment, and described
When second current time was more than the clock source moment, second current time and the first clock information sum work are calculated
For propagation delay time of the communication packet in the interchanger；
It is more than the chain-circuit time delay when first current time, first current time is more than the clock source moment, and
When second current time is less than the clock source moment, the clock source recordable maximum moment and described first is calculated
The difference of clock information, and the difference and the second current time sum are obtained as communication packet in the interchanger
Propagation delay time；
It is more than the chain-circuit time delay when first current time, first current time is more than the clock source moment, and
When second current time is more than the clock source moment, calculate second current time and first clock information it
Propagation delay time of the difference as communication packet in the interchanger；
It is more than the chain-circuit time delay when first current time, first current time is less than the clock source moment, and
When second current time is less than the clock source moment, calculate second current time and first clock information it
Propagation delay time of the difference as communication packet in the interchanger；
It is more than the chain-circuit time delay when first current time, first current time is less than the clock source moment, and
When second current time is more than the clock source moment, calculate second current time and first clock information it
Propagation delay time of the difference as communication packet in the interchanger.
3. the method as described in claim 1, it is characterised in that also carried in the communication packet the first current time with it is described
Magnitude relationship between chain-circuit time delay；
When the second clock packet contains the reversion number of times at the second current time and the clock source, according to the communication
First clock information carried in message, and the second clock information, obtain the communication packet and are exchanged described
Propagation delay time in machine, is specifically included：
When being less than the chain-circuit time delay at first current time, according to first clock information, it is described second it is current when
The reversion number of times of quarter, the clock source recordable maximum moment, and the clock source, obtains the communication packet described
Propagation delay time in interchanger；
When being more than the chain-circuit time delay at first current time, according to first clock information, it is described second it is current when
The reversion number of times of quarter, the clock source recordable maximum moment, and the clock source, obtains the communication packet described
Propagation delay time in interchanger.
4. the method as described in claim any one of 1-3, it is characterised in that the communication packet is by the industry measurement and control system
In sampling apparatus send to local, or, the communication packet is sent by other interchangers in the industry measurement and control system
To local.
5. the method as described in claim 1, it is characterised in that obtain after the communication packet propagation delay time, further wrap
Include：
The corresponding binary system Delay of the communication packet propagation delay time is generated, and the binary system Delay is added to
Specified location in the communication packet；
The communication packet is sent into the protection device into the industry measurement and control system, the protection device is made according to described logical
The sampled data carried in news message performs corresponding protection to faulty equipment and operated.
6. a kind of message transmissions time delay acquisition device, applied in industry measurement and control system, it is characterised in that the industrial measurement and control system
System includes at least one interchanger, and described device includes：
Writing unit, for after the receiving port for determining the interchanger receives communication packet, in the communication packet
Specified location add corresponding first clock information of clock source of the interchanger；Wherein, first clock information is chain
The absolute value of difference at the time of road time delay and the receiving port receive the communication packet；
Clock information acquiring unit, for getting the logical of the first clock information of addition when the sending port for determining the interchanger
Interrogate after message, determine the corresponding second clock information of the clock source；Wherein, the second clock packet contains the transmitting terminal
Mouth get it is described addition the first clock information communication packet at the time of and the clock source reversion number of times；Wherein, institute
The reversion number of times for stating clock source represents that the clock source reaches the number of times at the recordable maximum moment of itself；Wherein, clock source
The recordable maximum moment is equal to the maximum time value represented by storable temporal information in the communication packet；The communication
Three binary identifications are also carried in message, wherein, three binary identifications are obtained in the following manner：When described
When communication packet reaches sending port, or, after the receiving port of interchanger receives the communication packet, it is respectively compared the
Magnitude relationship between one current time and the chain-circuit time delay, first current time and the clock source are recordable most
The magnitude relationship at the half corresponding clock source moment at big moment, and the chain-circuit time delay and the clock source it is recordable most
The magnitude relationship at the half corresponding clock source moment at big moment, and generate corresponding binary system mark according to three comparative results
Know；
Propagation delay time acquiring unit, for according to first clock information carried in the communication packet, and described
Two clock informations, obtain propagation delay time of the communication packet in the interchanger.
7. device as claimed in claim 6, it is characterised in that the propagation delay time acquiring unit, specifically for：
When the second clock information only included for the second current time, if first current time is less than the link
Prolong, the chain-circuit time delay is more than the clock source moment, and second current time is less than the clock source moment, then calculates
Second current time and the first clock information sum are as initial correspondence message transmissions time delay, if the initial correspondence
Message transmissions time delay is less than the clock source recordable maximum moment, then using the initial correspondence message transmissions time delay as logical
Interrogate propagation delay time of the message in the interchanger；If first current time is less than the chain-circuit time delay, during the link
Prolong less than the clock source moment, and second current time is less than the clock source moment, then calculates described second current
Moment and propagation delay time of the first clock information sum as communication packet in the interchanger；If described first is current
Moment is less than the chain-circuit time delay, and the chain-circuit time delay is more than the clock source moment, and second current time is more than institute
The clock source moment is stated, then calculates second current time and the first clock information sum and is handed over as communication packet described
Propagation delay time in changing planes；If first current time is less than the chain-circuit time delay, the chain-circuit time delay is less than the clock
The source moment, and second current time is more than the clock source moment, then calculates second current time and described first
Propagation delay time of the clock information sum as communication packet in the interchanger；If first current time is more than the chain
Road time delay, when first current time is less than the clock source more than the clock source moment, and second current time
Carve, then calculate the difference at the clock source recordable maximum moment and first clock information, and obtain the difference
Propagation delay time with the second current time sum as communication packet in the interchanger；If first current time is more than
The chain-circuit time delay, when first current time is more than described more than the clock source moment, and second current time
The Zhong Yuan moment, then the difference of second current time and first clock information is calculated as communication packet in the interchanger
In propagation delay time；If first current time is more than the chain-circuit time delay, first current time is less than the clock
The source moment, and second current time is less than the clock source moment, then calculates second current time and described first
Propagation delay time of the difference of clock information as communication packet in the interchanger；If first current time is more than the chain
Road time delay, when first current time is more than the clock source less than the clock source moment, and second current time
Carve, then calculate biography of the difference of second current time and first clock information as communication packet in the interchanger
Defeated time delay.
8. device as claimed in claim 6, it is characterised in that the propagation delay time acquiring unit, specifically for：
If also carrying the magnitude relationship between the first current time and the chain-circuit time delay in the communication packet, when described
During reversion number of times of two clock informations comprising the second current time and the clock source, if first current time is less than institute
State chain-circuit time delay, then according to first clock information, second current time, when the clock source is recordable maximum
Carve, and the clock source reversion number of times, obtain the propagation delay time of the communication packet in the interchanger；If described
One current time was more than the chain-circuit time delay, then according to first clock information, second current time, the clock source
The recordable maximum moment, and the clock source reversion number of times, obtain the biography of the communication packet in the interchanger
Defeated time delay.
9. the device as described in claim any one of 6-8, it is characterised in that said write unit, is used for：
The communication packet sent by the sampling apparatus in the industry measurement and control system is received, or, receive by the industry
The communication packet that other interchangers in TT＆C system are sent.
10. device as claimed in claim 6, it is characterised in that also including transmitting element, is used for：
Obtain after the communication packet propagation delay time, generate the corresponding binary system time delay letter of the communication packet propagation delay time
Breath, and the specified location that the binary system Delay is added in the communication packet；By the communication packet send to
Protection device in the industry measurement and control system, makes the protection device according to the sampled data pair carried in the communication packet
Faulty equipment performs corresponding protection operation.
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