CN103986601A - Message transmission delay obtaining method and device - Google Patents
Message transmission delay obtaining method and device Download PDFInfo
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Abstract
The invention discloses a message transmission delay obtaining method and device. The method includes the steps that first clock information for receiving a communication message by a receiving port and second clock information for sending the communication message by a sending port are obtained, and transmission time delay of the communication message in a switch is determined according to the first clock information and the second clock information. According to the technical scheme, corresponding timestamp information is added to a designated position in the communication message by the switch, the transmission time delay of the corresponding communication message in the switch is determined in the local transmission process of the communication message in the switch, under the condition of loss of synchronization of an industrial measuring and controlling system and a synchronous source, the transmission time delay of the communication message in the switch can still be conveniently and fast determined, and therefore fault protection of equipment in the industrial measuring and controlling system and the accuracy of a fault detection result are ensured.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of message transmissions time delay acquisition methods and device.
Background technology
At present, in industry measurement and control system, take in Intelligent Substation System is example, and when any equipment in Intelligent Substation System breaks down, the sampling apparatus in Intelligent Substation System can generate SV (Sampled Value according to the sampled data relevant to fault; Sampling value) message, and SV message is transferred to protective device by switch network.
Based on the restriction of existing switched network performance, there is propagation delay time in the transmission of SV message in switching network, and the moment that protective device receives SV message will be later than converting equipment and send SV message.Therefore, in Intelligent Substation System or Intelligent Substation System be also provided with the synchronisation source that Intelligent Substation System is corresponding outward, for guaranteeing the synchronism of the sampled data that converting equipment obtains.Concrete; protective device can be calibrated protective device local clock information according to the clock information of synchronisation source according to predetermined period; when protective device receives after SV message; obtain the sampled data of carrying in this SV message; and the acquisition time corresponding according to the sampled data of carrying in SV message; determine the time of failure of faulty equipment, thereby faulty equipment is carried out to corresponding operation.Special; when synchronisation source fault corresponding to Intelligent Substation System; corresponding propagation delay time owing to cannot determine switching network transmission SV message time; therefore; when receiving SV message, protective device cannot judge the synchronism that adopts data; setting based on existing intelligent substation, above-mentioned protective device is out of service, thereby is unfavorable for protection and the fault detect of equipment in Intelligent Substation System.
Similarly; in the industry measurement and control system that the intelligent industrial TT&C system of take is example; also be to adopt said method to GOOSE (Generic Object Oriented Substation Event; transformer substation case towards general object) message transmits; therefore, protective device cannot be determined the propagation delay time of GOOSE message in switch equally.
In addition, for some industrial communication agreements as communication packet, for example: the propagation delay time that profinet (in real time deterministic industrial Ethernet agreement) transmits in switch cannot be determined equally.
In sum, at present in being included in industry measurement and control system, due to the propagation delay time of the communication packet that cannot obtain switching network in switch, causing and cannot carry out to equipment in industry measurement and control system the problem of fault detect and error protection.
Summary of the invention
The embodiment of the present invention provides a kind of message transmissions time delay acquisition methods and device, and in order to solve at present in industry measurement and control system, existence cannot be carried out to equipment in industry measurement and control system the problem of fault detect and error protection.
The concrete technical scheme that the embodiment of the present invention provides is as follows:
A message transmissions time delay acquisition methods, is applied in industry measurement and control system, and described industry measurement and control system comprises at least one switch, and described method comprises:
When determining that the receiving port of described switch receives after communication packet, the assigned address in described communication packet adds first clock information corresponding to clock source of described switch; Wherein, described the first clock information is the absolute value of the difference in chain-circuit time delay and described receiving port moment of receiving described communication packet;
When determining that the transmit port of described switch gets after the communication packet that adds the first clock information, determines the second clock information that described clock source is corresponding; Wherein, described second clock packets of information gets the moment of the communication packet of described interpolation the first clock information containing described transmit port; Or described second clock packets of information gets the moment of communication packet and the reversion number of times of described clock source of described interpolation the first clock information containing described transmit port;
According to described the first clock information carrying in described communication packet, and described second clock information, the propagation delay time of described communication packet in described switch obtained.
Optionally, in described communication packet, also carry the magnitude relationship between described the first current time and described chain-circuit time delay, described the first current time and recordable maximum half the corresponding clock source constantly of described clock source magnitude relationship constantly, and described chain-circuit time delay and recordable maximum half the corresponding clock source constantly of described clock source magnitude relationship constantly; When described second clock information only comprises the second current time, when described the first current time is less than described chain-circuit time delay, described chain-circuit time delay is greater than described clock source constantly, and described the second current time is less than described clock source during the moment, calculate described the second current time and described the first clock information sum as initial communication packet propagation delay time, if described initial communication packet propagation delay time be less than described clock source recordable maximum constantly, using described initial communication packet propagation delay time as communication packet the propagation delay time in described switch; When described the first current time is less than described chain-circuit time delay, described chain-circuit time delay is less than described clock source constantly, and described the second current time is less than described clock source constantly time, calculate described the second current time and described the first clock information sum as communication packet the propagation delay time in described switch; When described the first current time is less than described chain-circuit time delay, described chain-circuit time delay is greater than described clock source constantly, and described the second current time is greater than described clock source constantly time, calculate described the second current time and described the first clock information sum as communication packet the propagation delay time in described switch; When described the first current time is less than described chain-circuit time delay, described chain-circuit time delay is less than described clock source constantly, and described the second current time is greater than described clock source constantly time, calculate described the second current time and described the first clock information sum as communication packet the propagation delay time in described switch; When described the first current time is greater than described chain-circuit time delay, described the first current time is greater than described clock source constantly, and described the second current time is less than described clock source during the moment, calculate described clock source recordable maximum constantly with the difference of described the first clock information, and obtain described difference and the second current time sum as communication packet the propagation delay time in described switch; When described the first current time is greater than described chain-circuit time delay, described the first current time is greater than described clock source constantly, and described the second current time is greater than described clock source constantly time, the difference of calculating described the second current time and described the first clock information is the propagation delay time in described switch as communication packet; When described the first current time is greater than described chain-circuit time delay, described the first current time is less than described clock source constantly, and described the second current time is less than described clock source constantly time, the difference of calculating described the second current time and described the first clock information is the propagation delay time in described switch as communication packet; When described the first current time is greater than described chain-circuit time delay, described the first current time is less than described clock source constantly, and described the second current time is greater than described clock source constantly time, the difference of calculating described the second current time and described the first clock information is the propagation delay time in described switch as communication packet.
Optionally, in described communication packet, also carry the magnitude relationship between described the first current time and described chain-circuit time delay; When described second clock packets of information contains the reversion number of times of the second current time and described clock source, when described the first current time is less than described chain-circuit time delay, according to described the first clock information, described the second current time, described clock source is recordable constantly maximum, and the reversion number of times of described clock source, obtain the propagation delay time of described communication packet in described switch; When described the first current time is greater than described chain-circuit time delay, according to described the first clock information, described the second current time, described clock source is recordable constantly maximum, and the reversion number of times of described clock source, obtain the propagation delay time of described communication packet in described switch.
Adopt technique scheme, the clock information providing according to local clock source is provided for the first clock information and second clock information that switch obtains, need not keep synchronizeing with synchronisation source, thereby reduce the Signalling exchange between industry measurement and control system and synchronisation source, save system resource.
Optionally, the sampling apparatus of described communication packet in described industry measurement and control system is sent to this locality, or described communication packet other switches in described industry measurement and control system are sent to this locality.
Further, after obtaining described communication packet propagation delay time, generate binary system Delay corresponding to described communication packet propagation delay time, and described binary system Delay is added into the assigned address in described communication packet; Described communication packet is sent to the protective device in described industry measurement and control system, makes described protective device, according to the sampled data of carrying in described communication packet, faulty equipment be carried out to corresponding protection operation.
A message transmissions time delay acquisition device, is applied in industry measurement and control system, and described industry measurement and control system comprises at least one switch, and described device comprises:
Writing unit, receives after communication packet for the receiving port when definite described switch, and the assigned address in described communication packet adds first clock information corresponding to clock source of described switch; Wherein, described the first clock information is the absolute value of the difference in chain-circuit time delay and described receiving port moment of receiving described communication packet;
Clock information acquiring unit, gets after the communication packet that adds the first clock information for the transmit port when definite described switch, determines the second clock information that described clock source is corresponding; Wherein, described second clock packets of information gets the moment of the communication packet of described interpolation the first clock information containing described transmit port; Or described second clock packets of information gets the moment of communication packet and the reversion number of times of described clock source of described interpolation the first clock information containing described transmit port;
Propagation delay time acquiring unit, for described the first clock information carrying according to described communication packet, and described second clock information, obtain the propagation delay time of described communication packet in described switch.
Optionally, described propagation delay time acquiring unit, specifically for: if also carry the magnitude relationship between described the first current time and described chain-circuit time delay in described communication packet, described the first current time and recordable maximum half the corresponding clock source constantly of described clock source magnitude relationship constantly, and described chain-circuit time delay and recordable maximum half the corresponding clock source constantly of described clock source magnitude relationship constantly, when described second clock information only comprises the second current time, if described the first current time is less than described chain-circuit time delay, described chain-circuit time delay is greater than described clock source constantly, and described the second current time is less than described clock source constantly, calculate described the second current time and described the first clock information sum as initial communication packet propagation delay time, if it is recordable constantly maximum that described initial communication packet propagation delay time is less than described clock source, using described initial communication packet propagation delay time as communication packet the propagation delay time in described switch, if described the first current time is less than described chain-circuit time delay, described chain-circuit time delay is less than described clock source constantly, and described the second current time is less than described clock source constantly, calculate described the second current time and described the first clock information sum as communication packet the propagation delay time in described switch, if described the first current time is less than described chain-circuit time delay, described chain-circuit time delay is greater than described clock source constantly, and described the second current time is greater than described clock source constantly, calculate described the second current time and described the first clock information sum as communication packet the propagation delay time in described switch, if described the first current time is less than described chain-circuit time delay, described chain-circuit time delay is less than described clock source constantly, and described the second current time is greater than described clock source constantly, calculate described the second current time and described the first clock information sum as communication packet the propagation delay time in described switch, if described the first current time is greater than described chain-circuit time delay, described the first current time is greater than described clock source constantly, and described the second current time is less than described clock source constantly, calculate described clock source recordable maximum constantly with the difference of described the first clock information, and obtain described difference and the second current time sum as communication packet the propagation delay time in described switch, if described the first current time is greater than described chain-circuit time delay, described the first current time is greater than described clock source constantly, and described the second current time is greater than described clock source constantly, the difference of calculating described the second current time and described the first clock information is the propagation delay time in described switch as communication packet, if described the first current time is greater than described chain-circuit time delay, described the first current time is less than described clock source constantly, and described the second current time is less than described clock source constantly, the difference of calculating described the second current time and described the first clock information is the propagation delay time in described switch as communication packet, if described the first current time is greater than described chain-circuit time delay, described the first current time is less than described clock source constantly, and described the second current time is greater than described clock source constantly, the difference of calculating described the second current time and described the first clock information is the propagation delay time in described switch as communication packet.
Optionally, described propagation delay time acquiring unit, specifically for: if also carry the magnitude relationship between described the first current time and described chain-circuit time delay in described communication packet, when described second clock packets of information contains the reversion number of times of the second current time and described clock source, if described the first current time is less than described chain-circuit time delay, according to described the first clock information, described the second current time, described clock source is recordable constantly maximum, and the reversion number of times of described clock source, obtain the propagation delay time of described communication packet in described switch; If described the first current time is greater than described chain-circuit time delay, according to described the first clock information, described the second current time, described clock source is recordable constantly maximum, and the reversion number of times of described clock source, obtain the propagation delay time of described communication packet in described switch.
Adopt technique scheme, the clock information providing according to local clock source is provided for the first clock information and second clock information that switch obtains, need not keep synchronizeing with synchronisation source, thereby reduce the Signalling exchange between industry measurement and control system and synchronisation source, save system resource.
Optionally, said write unit, for: receive the described communication packet by the sampling apparatus transmission of described industry measurement and control system, or, the described communication packet that other switches in described industry measurement and control system send received.
Further, said apparatus also comprises transmitting element, be used for: after obtaining described communication packet propagation delay time, generate binary system Delay corresponding to described communication packet propagation delay time, and described binary system Delay is added into the assigned address in described communication packet; Described communication packet is sent to the protective device in described industry measurement and control system, makes described protective device, according to the sampled data of carrying in described communication packet, faulty equipment be carried out to corresponding protection operation.
In the embodiment of the present invention, obtain the first clock information that receiving port receives communication packet, and transmit port sends the second clock information of above-mentioned communication packet, according to this first clock information, second clock information, determines the propagation delay time of communication packet in switch in switch.Adopt technique scheme; the assigned address of switch in communication packet adds corresponding timestamp information; and according to this timestamp information; determine communication packet corresponding communication packet propagation delay time in switch in switch local transmission process; the in the situation that of industry measurement and control system and synchronisation source step-out; still can conveniently determine the propagation delay time of communication packet in switch, thereby guarantee the error protection of equipment in industry measurement and control system and fault detect result accuracy.
Accompanying drawing explanation
Fig. 1 is industry measurement and control system configuration diagram in the embodiment of the present invention;
Fig. 2 obtains the propagation delay time flow chart of communication packet in 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 diagram in the embodiment of the present invention;
Fig. 5 is the SV message schematic diagram adding in the embodiment of the present invention after the propagation delay time of SV message in switch;
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, existence cannot 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, obtain the first clock information that receiving port receives communication packet, and transmit port sends the second clock information of above-mentioned communication packet, according to this first clock information, second clock information, determines the propagation delay time of communication packet in switch in switch.Adopt technique scheme; the assigned address of switch in communication packet adds corresponding timestamp information; and according to this timestamp information; determine communication packet corresponding communication packet propagation delay time in switch in switch local transmission process; the in the situation that of industry measurement and control system and synchronisation source step-out; still can conveniently determine the propagation delay time of communication packet in switch, thereby guarantee the error protection of equipment in industry measurement and control system and fault detect result accuracy.
In this following specific embodiment, what the communication packet of take carried out as SV message as example illustrates; Similarly, GOOSE message has the message format that SV message is identical, equally retention position is used as assigned address, for bearing message propagation delay time information in GOOSE message.In addition, industrial communication agreement is as communication packet, and for example the data field in Profinet form is not specifically defined, and therefore this data area can be used as assigned address, for bearing message propagation delay time information.In like manner, in other industrial communication agreement, can delimit relevant position and use as assigned address, also can meet requirement of the present invention.
Below in conjunction with accompanying drawing, the preferred device for carrying out said of the present invention is elaborated.
Consult shown in Fig. 1; for industry measurement and control system Organization Chart in the embodiment of the present invention; this industry measurement and control system comprises faulty equipment; sampling apparatus, switching network, and protective device; wherein; this switching network comprises at least one switch, the propagation delay time of the SV message that can obtain by each switch in switching network self in switch, the propagation delay time of the SV message that also can obtain by special propagation delay time acquisition device switching network in switch.In the embodiment of the present invention, the propagation delay time of SV message in switch of obtaining self by each switch in switching network of take describes in detail as example.
Consult shown in Fig. 2, in the embodiment of the present invention, the process of obtaining the propagation delay time of SV message in switch is:
Step 200: determine local receiving port when switch and receive after SV message, the assigned address in this SV message obtains the first clock information corresponding to local clock source.
Consult shown in Fig. 3, in the embodiment of the present invention, switch comprises receiving port, transmit port, exchanging array, and clock source.Wherein, receiving port is used for receiving SV message; Transmit port is for being sent to protective device by this SV message; Clock source is for mark clock information, and this clock source exists and can record maximum (being td) constantly, and recorded maximum that arrives self when clock source be during the moment, this clock source reverse (restarting timing from 0).
In the embodiment of the present invention, owing to comprising at least one switch in the switching network in industry measurement and control system, therefore, it is local that the sampling apparatus of above-mentioned SV message in industry measurement and control system is sent to this switch; Or while comprising at least two switches in switching system, SV message also can be sent to this switch this locality by other switches in industry measurement and control system.When the SV message receiving when switch is sent by sampling apparatus, the chain-circuit time delay of the switching network carrying in above-mentioned SV message (being designated as △ t0) is 0; When the SV message receiving when switch is sent by other switches, the chain-circuit time delay △ t0 of the switching network carrying in above-mentioned SV message is not 0, for example, when switch 1 receives the SV message of switch 0 transmission, can obtain the chain-circuit time delay carrying in SV message, the propagation delay time of the SV message that this chain-circuit time delay is switch 1 correspondence in switch 1.
Switch based on shown in above-mentioned Fig. 3, when receiving port being detected and receive SV message, receives the first current time corresponding to the first bit information SV message from clock source receiving port; The absolute value of the chain-circuit time delay carrying in calculating SV message and the difference of the first current time, writes the assigned address in SV message using the absolute value of the difference of this chain-circuit time delay and the first current time as the first clock information.
Consulting shown in Fig. 4 a, is SV message schematic diagram in the embodiment of the present invention.Optionally, using the reserved field of the Reserved1 in SV message and Reserved2 as assigned address, add the first clock information.Concrete, consult shown in Fig. 4 b, be a part for SV message, a part for this SV message comprises 32 bits, wherein, the position of bit sequence 0～23 correspondence is the assigned address of SV message, is about to the 1st position corresponding to bit to the 24 bits that the first clock information is saved to SV message; The position of bit sequence 24～29 correspondences is the extension bits of SV message; The position of bit sequence 30 correspondences is the quality position of SV message, when this position is 0 to represent effectively, when this position be 1 represent invalid; The position of bit sequence 31 correspondences is the test bit of SV message.
Optionally, when switch obtains after the first clock information, this first clock information is converted to binary format, and the first clock information of this binary format is stored to above-mentioned assigned address; And the temporal information of storing in this SV message be take nanosecond as unit, owing to comprising 24 bits in this SV message, store this temporal information, therefore, in SV message, the represented maximum time value of storable temporal information is 16.777215 milliseconds (2
24nanosecond).
Further, the recordable maximum td constantly of above-mentioned clock source presets according to concrete application scenarios.For the ease of the simplicity of the propagation delay time acquisition process in switch to SV message, preferably, the recordable maximum td constantly of above-mentioned clock source equals the represented maximum time value of storable temporal information in above-mentioned SV message.
Optionally, in above-mentioned SV message, also carry above-mentioned the first current time (being designated as t1), the recordable maximum td constantly of chain-circuit time delay △ t0 and clock source, when this SV message arrives transmit port, by above-mentioned the first current time t1 and chain-circuit time delay △ t0, the recordable maximum of chain-circuit time delay △ t0 and clock source half corresponding clock source is constantly (being designated as td/2) constantly, and the first current time compares respectively with recordable maximum half the corresponding clock source moment td/2 constantly of clock source.Or, when switch receiving port receives after SV message, the the first current time t1 relatively obtaining respectively and chain-circuit time delay △ t0, recordable maximum half the corresponding clock time td/2 constantly of chain-circuit time delay △ t0 and clock source, and first current time and recordable maximum half the corresponding clock source constantly of the clock source td/2 constantly, and according to above-mentioned three comparative results, generate corresponding binary identification and be added into the bit that the sequence number in SV message is 0～2.For example, if t1 < is td/2, record f
t1=1, if t1 > is td/2, record f
t1=0; If △ t0 < is td/2, record f
△ t0=1, if △ t0 > is td/2, record f
△ t0=0; If t1 < △ is t0, record f
tMiddle=1, if t1 > △ is t0, record f
tMiddle=0, wherein, this tMiddle=| Δ t0-t1|.As can be seen here, when adopting technique scheme, if binary identification corresponding to the bit that the sequence number in SV message is 0～2 is f
tMiddle=1, f
t1=1, represent t1 > △ t0, t1 < td/2.Compared in front a kind of scheme directly by above-mentioned t1, △ t0, t2, and td/2 is added into the mode in SV message, while adopting rear a kind of technical scheme, by three binary identification, represent t1, △ t0, t2, and the relation between td/2, in SV message, in assigned address, except above-mentioned three bits, can also carry the first clock information, thereby improve the precision of clock information entrained in SV message.
Step 210: determine local transmit port when switch and get after the SV message of above-mentioned interpolation the first clock information, determine the second clock information that clock source is corresponding.
In the embodiment of the present invention, when switch determines that above-mentioned SV message arrives local transmit port, determine that this transmit port gets the second current time of the clock source that the first bit information in SV message is corresponding, and the second current time of this clock source is carried out to record as second clock information; Or, when switch determines that above-mentioned SV message arrives local transmit port, determine that transmit port gets the second current time of the clock source that the first bit information in SV message is corresponding, and the reversion number of times of this clock source, and the reversion number of times of the second current time of above-mentioned clock source and clock source is carried out to record as second clock information.As can be seen here, above-mentioned second clock information gets the information in the first bit moment of SV message for characterizing the transmit port of switch; Or, above-mentioned second clock information for the first bit of characterizing the transmit port of switch and getting SV message constantly, and the information of reversion number of times corresponding to clock source.
Adopt technique scheme, the clock information providing according to local clock source is provided for the first clock information and second clock information that switch obtains, need not keep synchronizeing with synchronisation source, thereby reduce the Signalling exchange between industry measurement and control system and synchronisation source, save system resource.
Step 220: according to the first clock information carrying in above-mentioned SV message, and second clock information, obtain the propagation delay time of SV message in switch.
In the embodiment of the present invention, according to whether comprising reversion number of times in second clock information, the mode that switch obtains the propagation delay time of SV message in switch is divided into two kinds:
First kind of way: while only comprising the first clock information in second clock information, switch is according to the first current time t1, the second current time (being designated as t2) comprising in second clock information, and the recordable maximum td constantly of clock source, and calculate recordable maximum half the corresponding clock source constantly of clock source td/2 constantly; Respectively by above-mentioned the first current time t1 and chain-circuit time delay △ t0, chain-circuit time delay △ t0 and recordable maximum half the corresponding clock source moment td/2 constantly of clock source, the first current time t1 and recordable maximum half the corresponding clock source moment td/2 constantly of clock source, and recordable maximum half the corresponding clock source constantly of the second current time t2 and clock source constantly td/2 compare, can obtain following eight kinds of comparative results, the process of obtaining the propagation delay time △ t of SV message in switch according to these eight kinds of comparative results is:
The first situation: when the first current time is less than chain-circuit time delay, chain-circuit time delay is greater than clock source constantly, and the second current time is less than clock source during the moment, switch computes the second current time and the first clock information sum are as initial SV message transmissions time delay, if it is recordable constantly maximum that initial SV message transmissions time delay is less than clock source, using initial SV message transmissions time delay as SV message the propagation delay time in switch.If can be expressed as with formula:
As t1 < △ t0, △ t0 > td/2, during t2 < td/2, △ t=t2+| Δ t0-t1|.
In the first situation, due to △ t0 > td/2, t1 < △ t0, and t2 < td/2, therefore, when t1 < td/2, show that clock source does not reverse, now, △ t=t2+| Δ t0-t1|; When t1 > td/2, show that clock source reverses, now, the △ t0 obtaining according to △ t=t2+| Δ t0-t1| will be greater than td, if td equals 16.777215 milliseconds,, because td exceeds the maximum time value that the assigned address in SV message can represent, therefore, the assigned address that switch need to send in error reporting prompting SV message cannot represent the propagation delay time of above-mentioned SV message in switch.
The second situation: when the first current time is less than chain-circuit time delay, chain-circuit time delay is less than clock source constantly, and the second current time is less than clock source during the moment, and calculating the second current time and above-mentioned the first clock information sum be the propagation delay time in switch as SV message.If can be expressed as with formula:
As t1 < △ t0, △ t0 < td/2, during t2 < td/2, △ t=t2+| Δ t0-t1|.
The third situation: when the first current time is less than chain-circuit time delay, chain-circuit time delay is greater than clock source constantly, and the second current time is greater than clock source during the moment, and calculating the second current time and above-mentioned the first clock information sum be the propagation delay time in switch as SV message.If can be expressed as with formula:
As t1 < △ t0, △ t0 > td/2, during t2 > td/2, △ t=t2+| Δ t0-t1|.
The 4th kind of situation: when the first current time is less than chain-circuit time delay, chain-circuit time delay is less than clock source constantly, and the second current time is greater than clock source constantly time, calculate the second current time and above-mentioned the first clock information as SV message the propagation delay time in switch.If can be expressed as with formula:
As t1 < △ t0, △ t0 < td/2, during t2 > td/2, △ t=t2+| Δ t0-t1|.
The 5th kind of situation: when the first current time is greater than chain-circuit time delay, the first current time is greater than clock source constantly, and the second current time is less than clock source during the moment, obtain calculate clock source recordable maximum constantly with the difference of above-mentioned the first clock information, and obtain above-mentioned difference and the second current time sum as SV message the propagation delay time in switch.In the 5th kind of situation, due to t1 > △ t0, t1 > td/2, and therefore t2 < td/2, shows that reversion has occurred clock source, if can be expressed as with formula:
As t1 > △ t0, t2 > td/2, during t2 < td/2, △ t=td-| Δ t0-t1|+t2.
The 6th kind of situation: when the first current time is greater than chain-circuit time delay, the first current time is greater than clock source constantly, and the second current time is greater than clock source during the moment, and the difference of calculating the second current time and above-mentioned the first clock information is the propagation delay time in switch as SV message.If can be expressed as with formula:
As t1 > △ t0, t1 > td/2, during t2 > td/2, △ t=t2-| Δ t0-t1|.
The 7th kind of situation: when the first current time is greater than chain-circuit time delay, the first current time is less than clock source constantly, and the second current time is less than clock source during the moment, and the difference of calculating the second current time and above-mentioned the first clock information is the propagation delay time in switch as SV message.If can be expressed as with formula:
As t1 > △ t0, t1 < td/2, during t2 < td/2, △ t=t2-| Δ t0-t1|.
The 8th kind of situation: when the first current time is greater than chain-circuit time delay, the first current time is less than clock source constantly, and the second current time is greater than clock source during the moment, and the difference of calculating the second current time and above-mentioned the first clock information is the propagation delay time in switch as SV message.If can be expressed as with formula:
As t1 > △ t0, t1 < td/2, during t2 > td/2, △ t=t2-| Δ t0-t1|.
Due in the first implementation, switch is according to t1, △ t0, t2, and whether the clock source that judges between td/2 reverse, and therefore, the propagation delay time of the above-mentioned SV message obtaining in switch is not more than td/2.
The second way: when second clock information comprises the reversion number of times of the second current time and clock source simultaneously, switch is according to the first current time t1 comprising in the first clock information, the the second current time t2 comprising in second clock information, and the reversion number of times of clock source, compare the first current time t1 and chain-circuit time delay △ t0, can obtain following two kinds of comparative results, according to the reversion times N of these two kinds of comparative results and clock source, here can support the reversion times N of correct judgement to depend on number of bits n reserved in SV message, relation is N=2
n-1, the process of obtaining the propagation delay time △ t of SV message in switch is:
The first situation: when the first current time is less than chain-circuit time delay, according to chain-circuit time delay, the first current time, the second current time, clock source is recordable constantly maximum, and the reversion number of times of clock source, obtains the propagation delay time of SV message in switch.In the first situation, due to t1 < △ t0, during N > 1, show that clock source reverses.If can be expressed as with formula:
As t1 < △ t0, time, △ t=td*N+t2+| Δ t0-t1|.
In said process, if td equals 16.777215 milliseconds, because td exceeds the maximum time value that the assigned address in SV message can represent, therefore, optionally, the assigned address of SV message is divided into two parts, a part is for carrying the reversion number of times of clock source, another part is for guaranteeing SV message in the situation that the propagation delay time precision of switch, the propagation delay time of the SV message that carrying is not more than td in switch.
The second situation: when the first current time is greater than chain-circuit time delay, according to chain-circuit time delay, the first current time, the second current time, clock source is recordable constantly maximum, and the reversion number of times of clock source, obtains the propagation delay time of SV message in switch.If can be expressed as with formula:
As t1 > △ t0, △ t=td*N+t2-| Δ t0-t1|.
Further, the bit that sequence number is 3～6 in SV message adds the sign of the reversion number of times that represents clock source, for example, when the reversion number of times of clock source is 3 times, the sign of the reversion number of times of this clock source is 11, and this binary identification is added into the bit that in above-mentioned SV message, sequence number is 3～6.
In the second implementation, in the assigned address due to SV message, comprised the sign that represents the reversion number of times of clock source, therefore, in this kind of mode, the propagation delay time of SV message in switch is no longer subject to the restriction of td/2.
Further, after switch obtains the propagation delay time of SV message in switch, generate binary system Delay corresponding to propagation delay time of SV message in switch, and this binary system Delay is added into the assigned address in SV message; This SV message is sent to the protective device in industry measurement and control system, makes protective device, according to the sampled data of carrying in SV message, faulty equipment be carried out to corresponding protection operation.For example, when the first bit of SV message enters receiving port, record due in t1=193.457101130 second; When the first bit of SV message sends from transmit port, switch records delivery time t2=193.457204970 second; Calculate SV message at the residence time Δ t=t2-t1=103840ns of current switch, Δ t value is converted to binary system is: 11001010110100000, by the above-mentioned binary system Delay little-endian successively SV message shown in Fig. 5.
Adopt technique scheme, by add the propagation delay time of timestamp accurate Calculation SV message in switch in SV message, and the propagation delay time of this SV message in switch is sent to protective device; Protective device receives after the propagation delay time of SV message in switch, relies on local time reference, utilize a plurality of intervals that the reduction of MU inherent delay receives sampled data generation constantly, complete the synchronous processing of sampled value.
Adopt after technical solution of the present invention, the propagation delay time precision of the SV message that switch obtains in switch be ± 100 nanoseconds (definite according to test result, can not lower than 1 microsecond); While there is a plurality of switch in switching network, the cumulative precision of the every jumping time delay of multi-exchange cascade be ± 100 nanoseconds (definite according to test result, can not lower than 1 microsecond); Technical solution of the present invention supports linear speed to be more than or equal to the message (100,000,000/gigabit) of 64 bytes.
Based on technique scheme, consult shown in Fig. 6, the present invention also provides a kind of message transmissions time delay acquisition device, comprises writing unit 60, clock information acquiring unit 61, propagation delay time acquiring unit 62, wherein:
Writing unit 60, receives after communication packet for the receiving port when definite described switch, and the assigned address in described communication packet adds first clock information corresponding to clock source of described switch; Wherein, described the first clock information is the absolute value of the difference in chain-circuit time delay and described receiving port moment of receiving described communication packet;
Clock information acquiring unit 61, gets after the communication packet that adds the first clock information for the transmit port when definite described switch, determines the second clock information that described clock source is corresponding; Wherein, described second clock packets of information gets the moment of the communication packet of described interpolation the first clock information containing described transmit port; Or described second clock packets of information gets the moment of communication packet and the reversion number of times of described clock source of described interpolation the first clock information containing described transmit port;
Propagation delay time acquiring unit 62, for described the first clock information carrying according to described communication packet, and described second clock information, obtain the propagation delay time of described communication packet in described switch.
Further, said apparatus also comprises transmitting element 63, be used for: obtain described communication packet after the propagation delay time of described switch, generate binary system Delay corresponding to the propagation delay time of described communication packet in described switch, and described binary system Delay is added into the assigned address in described communication packet; Described communication packet is sent to the protective device in described industry measurement and control system, makes described protective device, according to the sampled data of carrying in described communication packet, faulty equipment be carried out to corresponding protection operation.
In sum, in the embodiment of the present invention, determine local receiving port receive after sampling value communication packet when switch, the assigned address in this communication packet adds the first clock information corresponding to local clock source; When switch, determine local transmit port and receive after the communication packet of above-mentioned interpolation the first clock information, obtain the second clock information that clock source is corresponding; According to the first clock information carrying in above-mentioned communication packet, and second clock information, the propagation delay time of communication packet in described switch obtained.Adopt technical solution of the present invention; the assigned address of switch in communication packet adds corresponding timestamp information; and according to this timestamp information; determine communication packet corresponding communication packet propagation delay time in described switch in switch local transmission process; the in the situation that of industry measurement and control system and synchronisation source step-out; still can conveniently determine the propagation delay time of communication packet in described switch, thereby guarantee the error protection of equipment in industry measurement and control system and fault detect result accuracy.
Those skilled in the art should understand, embodiments of the invention can be provided as method, system or computer program.Therefore, the present invention can adopt complete hardware implementation example, implement software example or in conjunction with the form of the embodiment of software and hardware aspect completely.And the present invention can adopt the form that wherein includes the upper computer program of implementing of computer-usable storage medium (including but not limited to magnetic disc store, CD-ROM, optical memory etc.) of computer usable program code one or more.
The present invention is with reference to describing according to flow chart and/or the block diagram of the method for the embodiment of the present invention, equipment (system) and computer program.Should understand can be in computer program instructions realization flow figure and/or block diagram each flow process and/or the flow process in square frame and flow chart and/or block diagram and/or the combination of square frame.Can provide these computer program instructions to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce a machine, the instruction of carrying out by the processor of computer or other programmable data processing device is produced for realizing the device in the function of flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame appointments.
These computer program instructions also can be stored in energy vectoring computer or the computer-readable memory of other programmable data processing device with ad hoc fashion work, the instruction that makes to be stored in this computer-readable memory produces the manufacture that comprises command device, and this command device is realized the function of appointment in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame.
These computer program instructions also can be loaded in computer or other programmable data processing device, make to carry out sequence of operations step to produce computer implemented processing on computer or other programmable devices, thereby the instruction of carrying out is provided for realizing the step of the function of appointment in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame on computer or other programmable devices.
Although described the preferred embodiments of the present invention, once those skilled in the art obtain the basic creative concept of cicada, can make other change and modification to these embodiment.So claims are intended to all changes and the modification that are interpreted as comprising preferred embodiment and fall into the scope of the invention.
Obviously, those skilled in the art can carry out various changes and modification and not depart from the spirit and scope of the embodiment of the present invention the embodiment of the present invention.Like this, if within these of the embodiment of the present invention are revised and modification belongs to the scope of the claims in the present invention and equivalent technologies thereof, the present invention is also intended to comprise these changes and modification interior.
Claims (10)
1. a message transmissions time delay acquisition methods, is applied to, in industry measurement and control system, it is characterized in that, described industry measurement and control system comprises at least one switch, and described method comprises:
When determining that the receiving port of described switch receives after communication packet, the assigned address in described communication packet adds first clock information corresponding to clock source of described switch; Wherein, described the first clock information is the absolute value of the difference in chain-circuit time delay and described receiving port moment of receiving described communication packet;
When determining that the transmit port of described switch gets after the communication packet that adds the first clock information, determines the second clock information that described clock source is corresponding; Wherein, described second clock packets of information gets the moment of the communication packet of described interpolation the first clock information containing described transmit port; Or described second clock packets of information gets the moment of communication packet and the reversion number of times of described clock source of described interpolation the first clock information containing described transmit port;
According to described the first clock information carrying in described communication packet, and described second clock information, the propagation delay time of described communication packet in described switch obtained.
2. the method for claim 1, it is characterized in that, in described communication packet, also carry the magnitude relationship between described the first current time and described chain-circuit time delay, described the first current time and recordable maximum half the corresponding clock source constantly of described clock source magnitude relationship constantly, and described chain-circuit time delay and recordable maximum half the corresponding clock source constantly of described clock source magnitude relationship constantly;
When described second clock information only comprises the second current time, according to described the first clock information carrying in described communication packet, and described second clock information, obtain the propagation delay time of described communication packet in described switch, specifically comprise:
When described the first current time is less than described chain-circuit time delay, described chain-circuit time delay is greater than described clock source constantly, and described the second current time is less than described clock source during the moment, calculate described the second current time and described the first clock information sum as initial communication packet propagation delay time, if described initial communication packet propagation delay time be less than described clock source recordable maximum constantly, using described initial communication packet propagation delay time as communication packet the propagation delay time in described switch;
When described the first current time is less than described chain-circuit time delay, described chain-circuit time delay is less than described clock source constantly, and described the second current time is less than described clock source constantly time, calculate described the second current time and described the first clock information sum as communication packet the propagation delay time in described switch;
When described the first current time is less than described chain-circuit time delay, described chain-circuit time delay is greater than described clock source constantly, and described the second current time is greater than described clock source constantly time, calculate described the second current time and described the first clock information sum as communication packet the propagation delay time in described switch;
When described the first current time is less than described chain-circuit time delay, described chain-circuit time delay is less than described clock source constantly, and described the second current time is greater than described clock source constantly time, calculate described the second current time and described the first clock information sum as communication packet the propagation delay time in described switch;
When described the first current time is greater than described chain-circuit time delay, described the first current time is greater than described clock source constantly, and described the second current time is less than described clock source during the moment, calculate described clock source recordable maximum constantly with the difference of described the first clock information, and obtain described difference and the second current time sum as communication packet the propagation delay time in described switch;
When described the first current time is greater than described chain-circuit time delay, described the first current time is greater than described clock source constantly, and described the second current time is greater than described clock source constantly time, the difference of calculating described the second current time and described the first clock information is the propagation delay time in described switch as communication packet;
When described the first current time is greater than described chain-circuit time delay, described the first current time is less than described clock source constantly, and described the second current time is less than described clock source constantly time, the difference of calculating described the second current time and described the first clock information is the propagation delay time in described switch as communication packet;
When described the first current time is greater than described chain-circuit time delay, described the first current time is less than described clock source constantly, and described the second current time is greater than described clock source constantly time, the difference of calculating described the second current time and described the first clock information is the propagation delay time in described switch as communication packet.
3. the method for claim 1, is characterized in that, also carries the magnitude relationship between described the first current time and described chain-circuit time delay in described communication packet;
When described second clock packets of information contains the reversion number of times of the second current time and described clock source, according to described the first clock information carrying in described communication packet, and described second clock information, obtain the propagation delay time of described communication packet in described switch, specifically comprise:
When described the first current time is less than described chain-circuit time delay, according to described the first clock information, described the second current time, described clock source is recordable constantly maximum, and the reversion number of times of described clock source, obtain the propagation delay time of described communication packet in described switch;
When described the first current time is greater than described chain-circuit time delay, according to described the first clock information, described the second current time, described clock source is recordable constantly maximum, and the reversion number of times of described clock source, obtain the propagation delay time of described communication packet in described switch.
4. the method as described in claim 1-3, is characterized in that, the sampling apparatus of described communication packet in described industry measurement and control system is sent to this locality, or described communication packet other switches in described industry measurement and control system are sent to this locality.
5. the method for claim 1, is characterized in that, after obtaining described communication packet propagation delay time, further comprises:
Generate binary system Delay corresponding to described communication packet propagation delay time, and described binary system Delay is added into the assigned address in described communication packet;
Described communication packet is sent to the protective device in described industry measurement and control system, makes described protective device, according to the sampled data of carrying in described communication packet, faulty equipment be carried out to corresponding protection operation.
6. a message transmissions time delay acquisition device, is applied to, in industry measurement and control system, it is characterized in that, described industry measurement and control system comprises at least one switch, and described device comprises:
Writing unit, receives after communication packet for the receiving port when definite described switch, and the assigned address in described communication packet adds first clock information corresponding to clock source of described switch; Wherein, described the first clock information is the absolute value of the difference in chain-circuit time delay and described receiving port moment of receiving described communication packet;
Clock information acquiring unit, gets after the communication packet that adds the first clock information for the transmit port when definite described switch, determines the second clock information that described clock source is corresponding; Wherein, described second clock packets of information gets the moment of the communication packet of described interpolation the first clock information containing described transmit port; Or described second clock packets of information gets the moment of communication packet and the reversion number of times of described clock source of described interpolation the first clock information containing described transmit port;
Propagation delay time acquiring unit, for described the first clock information carrying according to described communication packet, and described second clock information, obtain the propagation delay time of described communication packet in described switch.
7. device as claimed in claim 6, is characterized in that, described propagation delay time acquiring unit, specifically for:
If also carry the magnitude relationship between described the first current time and described chain-circuit time delay in described communication packet, described the first current time and recordable maximum half the corresponding clock source constantly of described clock source magnitude relationship constantly, and described chain-circuit time delay and recordable maximum half the corresponding clock source constantly of described clock source magnitude relationship constantly, when described second clock information only comprises the second current time, if described the first current time is less than described chain-circuit time delay, described chain-circuit time delay is greater than described clock source constantly, and described the second current time is less than described clock source constantly, calculate described the second current time and described the first clock information sum as initial communication packet propagation delay time, if it is recordable constantly maximum that described initial communication packet propagation delay time is less than described clock source, using described initial communication packet propagation delay time as communication packet the propagation delay time in described switch, if described the first current time is less than described chain-circuit time delay, described chain-circuit time delay is less than described clock source constantly, and described the second current time is less than described clock source constantly, calculate described the second current time and described the first clock information sum as communication packet the propagation delay time in described switch, if described the first current time is less than described chain-circuit time delay, described chain-circuit time delay is greater than described clock source constantly, and described the second current time is greater than described clock source constantly, calculate described the second current time and described the first clock information sum as communication packet the propagation delay time in described switch, if described the first current time is less than described chain-circuit time delay, described chain-circuit time delay is less than described clock source constantly, and described the second current time is greater than described clock source constantly, calculate described the second current time and described the first clock information sum as communication packet the propagation delay time in described switch, if described the first current time is greater than described chain-circuit time delay, described the first current time is greater than described clock source constantly, and described the second current time is less than described clock source constantly, calculate described clock source recordable maximum constantly with the difference of described the first clock information, and obtain described difference and the second current time sum as communication packet the propagation delay time in described switch, if described the first current time is greater than described chain-circuit time delay, described the first current time is greater than described clock source constantly, and described the second current time is greater than described clock source constantly, the difference of calculating described the second current time and described the first clock information is the propagation delay time in described switch as communication packet, if described the first current time is greater than described chain-circuit time delay, described the first current time is less than described clock source constantly, and described the second current time is less than described clock source constantly, the difference of calculating described the second current time and described the first clock information is the propagation delay time in described switch as communication packet, if described the first current time is greater than described chain-circuit time delay, described the first current time is less than described clock source constantly, and described the second current time is greater than described clock source constantly, the difference of calculating described the second current time and described the first clock information is the propagation delay time in described switch as communication packet.
8. device as claimed in claim 6, is characterized in that, described propagation delay time acquiring unit, specifically for:
If also carry the magnitude relationship between described the first current time and described chain-circuit time delay in described communication packet, when described second clock packets of information contains the reversion number of times of the second current time and described clock source, if described the first current time is less than described chain-circuit time delay, according to described the first clock information, described the second current time, described clock source is recordable constantly maximum, and the reversion number of times of described clock source, obtains the propagation delay time of described communication packet in described switch; If described the first current time is greater than described chain-circuit time delay, according to described the first clock information, described the second current time, described clock source is recordable constantly maximum, and the reversion number of times of described clock source, obtain the propagation delay time of described communication packet in described switch.
9. the device as described in claim 6-8 any one, is characterized in that, said write unit, for:
The described communication packet that the sampling apparatus of reception in described industry measurement and control system sends, or, the described communication packet that other switches in described industry measurement and control system send received.
10. device as claimed in claim 6, is characterized in that, also comprises transmitting element, for:
After obtaining described communication packet propagation delay time, generate binary system Delay corresponding to described communication packet propagation delay time, and described binary system Delay is added into the assigned address in described communication packet; Described communication packet is sent to the protective device in described industry measurement and control system, makes described protective device, according to the sampled data of carrying in described communication packet, faulty equipment be carried out to corresponding protection operation.
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