CN102546097B - For using dynamic frame to encapsulate the method carried out data transmission in automated system - Google Patents
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Abstract
The present invention relates to a kind of method for data being transferred to receptor (100) from secondary scene equipment (102 108) by primary scene equipment (102 108) in automated system, the method is included in the following step on primary scene equipment: generate the first data burst (110 116), and the first data burst has the process data of primary scene equipment；Receiving the second Frame from secondary scene equipment, the second Frame has second data burst (110 116) of the process data with secondary scene equipment；Encapsulated by dynamic frame and the first Frame is sent on time receptor (100), first Frame includes the first and second data bursts, in the case of the second data burst can not be attached directly to the first data burst at the latest after sending the first data burst, by the way of punctual transmission, a time value is postponed in the transmission making the first Frame, so calculated time value, i.e. after sending the first data burst, the second data burst can be attached directly on the first data burst at once.
Description
Technical field
The present invention relates to a kind of method using dynamic frame encapsulation to carry out automation data transmission in automated system, use
In a kind of computer program carried out data transmission in automated system and a kind of field apparatus.
Background technology
In order to improve the message transmission rate from field apparatus to controller in automated system, introduce dynamic frame envelope
The concept of dress (Dynamic Frame Packing (DFP)).Data transmission is realized in the case of this external use container frame.?
During this, it is assigned to termination its data of internal transmission in above-mentioned container frame of encapsulation group.Thus obtained excellent
Point is, the expense of used ethernet frame only produces direct action when carrying out regulation transmission, this is because owing to using container
Frame and only use such as preambleStarting-frame delimiter and frame head.This method allows to increase package thickness,
Can to be carried out data transmission by multiple field apparatus within a clock cycle, wherein, and do not use the data of DFP to pass
Defeated comparing, the turnover rate in terms of transmission is significantly improved.
Fig. 1 shows the structure of typical real-time frame, wherein in order to carry out Ethernet transmission and by this frame this in use
Encapsulate corresponding to RFC894 in the case of the elements such as destination address, source address, ethernet type field value and CRC.Excellent using
In the case of first level mark (Priority Tagging), carry out corresponding to having the IEEE 802.1Q being arranged to 0 × 8100
Encapsulation, followed by priority hurdle/VLAN hurdle, is followed by arranged to 0 × 8892 and shows the ethernet type of real-time frame.
Frame identifier is used for marker frame itself, and wherein C_SDU is used for transmitting the I/O data of field apparatus, and APDU shape
State illustrates the state of frame.
Here, C_SDU is it is so structured that carry the I/O data of single field apparatus, or carry the IO of multiple field apparatus
Data.In the latter case, a part of C_SDU (the most so-called " subframe ") carries the content of specific field apparatus-at this
In the case of Zhong, frame is divided into multiple subframe.
The reason using frame to divide is: minimizes desire bandwidth, and optimizes efficiency in a uniform matter.As it is shown in figure 1,
The expense of frame, i.e. byte number waiting for transmission in addition to C_SDU are 28 bytes.But, because the frame gap of also 12 bytes
(InterFrameGap), the preamble of 7 bytes and the starting-frame delimiter of 1 byte, these aspects, frame must also be considered
Expense total amount have reached 48 bytes (if or preamble be reduced to 1 byte, then be 42 bytes).If C_
SDU additionally less than 40 bytes, then must additionally add this difference.
As can be seen here, the frame divided is used to reduce desire bandwidth by combination subframe 110 and 112, this is because such as Fig. 2
Shown in, the expense of subframe is only 6 bytes.By by frame single for multiple subframes combine to, the expense of used frame because of
This calculates once.
Each above-mentioned subframe 110 and 112 be assigned position, check bit, the data length of description C_SDU length,
Cycle counter (Cycle Counter), data mode and CRC.So-called position, refer to for given subframe is clear and definite
Identifier, wherein the list of subframe terminates with a specific sub-frame with location number 0.
Whether check bit should ignore CRC and the cycle counter of subframe for explanation.
The data mode of the data mode explanation subframe of subframe.The data of the data mode explanation frame in the APDU state of frame
State.If frame is made up of subframe, the data mode of the most negligible frame.Additionally, the data mode of frame to be distributed to a static state
Value is useful.
Summary of the invention
It is an object of the invention to, it is recommended that a kind of method for carrying out data transmission in automated system, Yi Jiyong
In a kind of computer program carried out data transmission in automated system and a kind of field apparatus.
Complete at this kind of in automated system, by primary scene equipment, data are transmitted from secondary scene equipment
To the method for receptor, the method is included in the following step on primary scene equipment:
-generate the first data burst, wherein this first data burst has the process data of primary scene equipment；
-receive the second Frame from secondary scene equipment, wherein this second Frame has with secondary scene equipment
Second data burst of process data；
-by dynamic frame encapsulation (DFP), the first Frame being sent to receptor on time, this first Frame includes first
With the second data burst.
Can be attached directly on the first data burst after sending the first data burst at the latest at the second data burst
In the case of, by the way of punctual transmission, make the transmission of the first Frame postpone a time value, so calculate this time value,
I.e. after sending the first data burst, the second data burst can be attached directly on the first data burst at once.
Above-mentioned receptor can be such as the controller of automated system, i.e. one so-called I/O control (IOC).So
And, receptor can also be attached to another field apparatus of primary scene device downstream.
The advantage of embodiment of the present invention is: owing to calculating by the seamless connectivity of the first and second data bursts
The time that most preferably sends of one Frame, it is ensured that the real-time Transmission in automated system.
Briefly, so postpone the first Frame and send the time started of time, even if the second data burst-once should
Data burst can use-can seamlessly add the first Frame to for dynamic frame encapsulation on primary scene equipment and include
The first Frame.The most described second data burst is encapsulated on primary scene equipment available for dynamic frame, this second number
Can be added to this moment already on the first data burst during sending by adding according to subframe.Sent out by punctual
The mode sent, also makes the second data burst be attached directly on the first data burst, represents that the second data burst can the most on time
To be attached on the first data burst-not have the gap of any waiting time form in time, this gap must send first
After data burst, it is filled with by so-called " gap frame ".Now it is necessary to receive the second data burst the most completely, i.e. exist
Described Frame dynamically can be attached to when receiving (input) second data burst on the first data burst of sending.
According to the embodiment of the present invention, the second Frame was counted from the transmitting continuous time of second to primary scene equipment
In the calculating of angle of incidence value.Such as, the transmitting continuous time include for by secondary scene equipment send the second Frame time
Between postpone, and/or being received time delay during the second Frame by primary scene equipment, and/or the second Frame is the
The time delay that the cable distribution time between two and primary scene equipment causes.
Thus in a precise manner, can determine which kind of degree the transmission of the first Frame must postpone in time, with
Just the hardware present situation about the first and second field apparatus is considered.The most also will be by considering the bus delay time, it is contemplated that the
Space length between one and secondary scene equipment-and i.e. in the case of the first and second field apparatus wide aparts, the first He
Between the equipment of the secondary scene, corresponding signal may require that longer time interval, existing to arrive first from secondary scene equipment
Field device.All these all can pass through the method according to the invention, be taken into account in the best way.
According to another embodiment of the present invention, by when being used on primary scene equipment the preparation performing dynamic frame encapsulation
Between count in the calculating of time value.Therefore, when calculating this time value, also can be it is considered herein that arrive the hard of primary scene apparatus-form
Part.Therefore can in the best way the second data burst be attached on the first data burst.
According to another embodiment of the present invention, the time difference of the local time's system in the first and second field apparatus is counted
In the calculating of angle of incidence value, the most so-called " Peer-to-Peer-Jitter (peer-to-peer network shake) ".
According to another embodiment of the present invention, the first Frame is sent to receptor by another field apparatus, its
In all field apparatus data transmission the most time-synchronously carry out；It is wherein that all field apparatus are default overall and/or indivedual
Local send start side-play amount (Global Start Offset) as time delay；In the process, at the scene on equipment
Data transmission start relative on adjacent field apparatus data transmit beginning at least be delayed transmission startup amount
Wherein carry out the transmission of the first Frame after side-play amount terminates as far back as sending to start by primary scene equipment.In other words,
A suitable time delay numerical value can be given specially, in this time delay with global mode or for each field apparatus
After, corresponding field apparatus starts to send process about adjacent field apparatus.
According to another embodiment of the present invention, when from second to primary scene equipment the second Frame transmitting continuous
Time difference of the local time's system in time and/or the first and second field apparatus and/or perform dynamic on primary scene equipment
Send the persistent period of whole first data burst during the time that state frame encapsulates, then this time value is negative.Send whole
The persistent period of one data burst depends on its size.First data burst is the biggest, it is necessary to the longest time, with by data
The individual bit of frame is sequentially transmitted to receptor.
According to another embodiment of the present invention, by the second Frame from the second transmitting continuous to primary scene equipment
The time difference of the local time's system in time, the first and second field apparatus, execution dynamic frame encapsulation on primary scene equipment
Time and on the equipment of the secondary scene, send the time value that the second Frame postponed in order to send on time constitute
Summation, deduct and send persistent period of whole first data bursts and calculate time value.The described time parameter of this summation
Can whole count in the calculating of time value.But, these parameters can also single count in the calculating of time value.When can root
When ignoring single parameter according to size, latter event is more meaningful.
According to another embodiment of the present invention, if the time value calculated opens less than the transmission of primary scene equipment
Dynamic side-play amount, then start side-play amount by the transmission of primary scene equipment and be used as time value.
On the other hand, the present invention relates to a kind of computer program, it is with the executable instruction of processor
(ASIC), it is used for performing method described above step.
On the other hand, the present invention relates to a kind of primary scene equipment, this primary scene equipment is for setting from the secondary scene
Standby receiving data, and be used for sending data to receptor, this primary scene equipment is additionally operable to perform the following step:
-generating the first data burst, this first data burst has the process data of primary scene equipment,
-receiving the second Frame from secondary scene equipment, this second Frame has the process with secondary scene equipment
Second data burst of data,
-by dynamic frame encapsulation (DFP), the first Frame being sent to receptor on time, this first Frame includes first
With the second data burst；
Wherein can not be attached directly to the first data burst after sending the first data burst at the latest at the second data burst
In the case of on, by the way of punctual transmission, make the transmission of the first Frame postpone a time value, and calculate this time value
Time, the second data burst should be made can be attached directly on the first data burst and then after sending the first data burst.
Accompanying drawing explanation
Below by accompanying drawing, further illustrate the preferred embodiment of the present invention.Shown in figure:
Fig. 3 is the method flow using DFP to carry out data transmission,
Fig. 4 is the method flow using DFP to carry out data transmission,
Fig. 5 is the diagram of DFP model of action,
Fig. 6 is the diagram of the DFP adjusted with data burst size,
Fig. 7 is when using punctual transmission mode, performs the diagram of DFP.
Hereinafter, can be with the similar element of identical reference number labelling.
Detailed description of the invention
Fig. 3 shows a kind of method that DFP of use carries out data transmission.Hereinafter thus set out, i.e. in automated system, remove
Outside controller (IOC) 100, four field apparatus (I/O device) 102,104,106 and 108 it have been sequentially arranged the most topologically.
The data transmission using dynamic frame encapsulation to carry out is issued to above-mentioned field apparatus from IOC 100 and is achieved in that, i.e. IOC 100 is by number
According to bag transmission to field apparatus 102, wherein this packet has multiple subframe 110,112,114 and 116, and it includes being respectively used to
The user data of field apparatus 102,104,106 or 108.Except subframe 110-116, the container 150 for data transmission also has
There are an Ethernet frame head 120 and an Ethernet postamble 118.
After equipment 102 have received container 150 at the scene, field apparatus 102 is extracted as its data burst 110 prepared, and
Send a new packet then in the step being marked with reference number 130 field apparatus 104.But, this is new
Packet no longer has data burst 110, and is only the data burst 112 of the downstream field devices 104-108 preparation of topology,
114 and 116.Ethernet frame head 120 is received without change, in contrast, generates a new Ethernet postamble 122, and
It is attached on this packet.
After equipment 104 have received the packet of so generation at the scene, field apparatus 104 is extracted as its data prepared
Frame 112, regenerates a new packet the most in step 132, and it only has data burst 114 and 116 now, and
Ethernet frame head 120.In addition, the packet so generated also has a new Ethernet postamble 124.
The packet so generated is received by field apparatus 106 the most again, and it extracts data burst 114, and in step
In 134, remaining data burst 116 is transmitted to together with the Ethernet postamble 126 that Ethernet frame head 120 and are new
After field apparatus 108.
Therefore can be summarized as, according to the sequencing from controller 100s, for each I/O device, (each scene sets
Standby 102,104,106 and 108) supply frame, wherein after having received packet every time, above-mentioned field apparatus by packet to change
The form crossed continues to transmit the field apparatus to downstream.
Fig. 4 shows the method flow using DFP to carry out data transmission equally, but is wherein different from the display in Fig. 3, logical
Cross field apparatus 108 to start to transmit data.Field apparatus 108 will be with Ethernet frame head and Ethernet postamble and embed therebetween
Data burst 116 frame send to field apparatus 106, its data burst 114 is then attached on data burst 116 by it,
And the packet so generated is transferred to field apparatus 104, it adds its data burst 112 to this packet again
On, and the frame so generated is transmitted to field apparatus 102.Its data burst 110 is attached to field apparatus by field apparatus 102
On the data burst 112 of 104, and the frame so generated is transmitted to such as controller 100.
Fig. 5 schematically shows how to carry out dynamic frame encapsulation according to the time.Here, abscissa represents packet process
Path, and on vertical coordinate labelling be transmission required time.
DFP schematic diagram in Fig. 5 is corresponding to the diagram of DFP data transmission in Fig. 4.Fig. 5 there is shown herein dynamic frame encapsulation
Preferable precondition, this represents, from the data burst of the field apparatus on right side to controller the most on schedule to
Reach the field apparatus being arranged in downstream, in order to can make the data burst that so receives no problemly, very close to each otherly
It is attached on the data burst of corresponding field apparatus.So, in Figure 5, such as data burst 116 can equipment 106 at the scene
Before sending data burst 114 completely, equipment 106 of reaching the spot.
If field apparatus 106 sends the time delay of data burst 114, then can according to this length of delay (FSO,
FrameSendOffset) determine a localized sustained time, when determine the transmission of data burst 114 according to this persistent period
Terminate.Size according to data burst 114 draws this time, i.e. saves according to the first character of data burst check total and sends
Time used actual frame first character joint, destination address first character joint between ratio, be multiplied by a system and determine
Numerical value, such as 80ns.This results in the in extremis, for this moment, be necessary for DFP at the scene on equipment 106 prepare
Good data burst 116.Otherwise there will be so-called " DFP frame late error ", i.e. one mistake.
It is noted that in the current situation, Ethernet frame head can be ignored without a moment's thought, because field apparatus 108
And it all can be transmitted by field apparatus 106.Because in addition, FSO is relevant to so-called starting-frame delimiter in principle, because of
The preamble used on the specific receiving port (Tx Port) of this field apparatus 106 is long or short inessential.
Therefore there is a following inequality:
FSOIODn+MaxLineRxDelay+MaxDFP_Feed≤FSOIODn-1+SubframeSizeIODn-1–
PeerToPeerJitter
The left side explanation data burst n of this inequality is at moment FSOIODnIt is transmitted, wherein by field apparatus n (IODn)
This data burst n has to pass through the holding wire between field apparatus n and n-1 (IODn and IODn-1).The most also on adding
The time of transmitting continuous time between MaxLineRxDelay, i.e. Frame equipment at the scene.This transmitting continuous time except by
Outside the time delay that the cable distribution time between Frame at the scene equipment causes, also include that field apparatus sends data
Time delay (Rx Delay) when the time delay (Tx Delay) of frame and/or field apparatus receiving data frames.
MaxDFP_Feed describes the time for performing dynamic frame encapsulation on the field apparatus received.MaxDFP_
Feed describes this device in order to the data of the data burst of arrival can just be attached to institute on current issued data burst
The time needed.
Moment FSO it is described on the right side of above-mentioned inequalityIODn-1Time send data burst n-1, wherein persistent period
SubframeSizeIODn-1It is added and makees the time period, i.e. send the persistent period needed for subframe n-1.Because respectively with
Local time's system that SyncMaster synchronizes determines FSO for IODn-1 or IOD, it is therefore necessary in view of so-called equity
Network jitter (PeertoPeer Jitter), i.e. relative to the time difference of local time's system in field apparatus.Because with data
The packet of subframe preferably must not arrive adjacent field apparatus too late, in order to can be enclosed on time, so should be from
FSOIODn-1In deduct this peer-to-peer network shake.
Above-mentioned inequality now can be converted to:
MaxDFP_Feed+MaxLineRxDelay+PeerToPeerJitter-SubframeSizeIODn-1≤
FSOIODn-1–FSOIODn
MaxDFP_Feed, PeertoPeer Jitter (peer-to-peer network shake), Tx Delay and Rx Delay
(two parts of MaxLineRxDelay) are the device attribute preset by the manufacturer of field apparatus.Only cable length can be by
User configures, and this cable length determines the signal of the ingredient as MaxLineRxDelay and runs the time.
According to prior art, now in order to meet the known following operative step of this inequality:
In DFP encapsulation group, essentially all field apparatus all starts being transmitted across of its data burst in the identical moment
Journey.In other words, the FSO of all field apparatus is identical numerical value, therefore FSOn-1-FSOnIt is zero.Thus obtain:
MaxDFP_Feed+MaxLineRxDelay+PeerToPeerJitter-SubframeSizeIODn-1≤0
And therefore
This represents: if the size of the actual real data burst on field apparatus is located in this formula calculate
Sizes values under, be necessary for artificially improving the corresponding size of data burst.Its example figure 6 illustrates:
Be sequentially connected with all field apparatus 102-108 in figure 6, and they have identical FSO value, i.e. start by
Data are to the identical moment transmitting adjacent field apparatus.But, the problem in Fig. 6 is: field apparatus 106 starts to receive data
The time of subframe 116 is substantially later than field apparatus 106 and terminates to send the time of its data burst 114.In other words, although
Before only the beginning of the data burst 116 of field apparatus 108 is received, field apparatus 106 is over towards field apparatus 104
Direction sends data burst 114.But, in order to data burst 116 being forwarded to field apparatus with a single frame
104, field apparatus 106, in being corresponding to above-mentioned equation " SubframeSize ", introduces gap infilled frame 600, its therefore conduct
Data burst 600 is directly connected on data burst 114.Have received data burst 116 on equipment 106 the most at the scene, it is just
Can dynamically be attached on data burst 600 to be sent, the most integrally produce frame shown in Fig. 6, it is by frame
Head, data burst 114, gap 600, data burst 116 and frame foot are constituted.
But, its consequence is the size adding so frame of transmission in the way of the most visual.This adds increased to be passed
The amount of transmission of data, therefore its performance is not fine.
Due to this reason, it is proposed that according to the method shown in Fig. 7, it achieves real-time Data Transmission, without increasing
Add the data transmission quantity of necessity.It is proposed that by when starting to postpone of the delivery time of the frame on field apparatus 106
Between section 704, until data burst 116 can seamlessly add on data burst 114, and non-intrusive is connected to data burst
Gap 600 on 114.Forming the frame about field apparatus 106 shown in Fig. 7 with this, it is by frame head 700, data burst
114, data burst 116 and frame foot 702 are constituted.
In other words, field apparatus IOD is so determinedn-1The transmission of (being field apparatus 106 in our example) starts
Moment FSO, the data burst 114 i.e. sent by this field apparatus just terminates, if field apparatus IODn(the example at us
In for field apparatus 108) data burst equipment 106 at the scene on be ready for DFP if.Therefore data burst 116 does not has
It is attached directly to a gap on data burst 114.In an embodiment of the invention, it is possible to for all field apparatus
Preset overall and/or the most locally a transmission startup side-play amount as time delay.Such transmission starts side-play amount
Illustrate, compared with the starting of data in field apparatus transmission starts with the data in adjacent field apparatus are transmitted,
At least be delayed this transmission start side-play amount, in order to can the most in a network for real-time Communication for Power reserve time period in pass
Defeated.For example, if presetting one all field apparatus effectively to be sent to startup side-play amount (Global Start
Offset), before this transmission startup shift time section terminates, corresponding sending out should not occur on equipment 102-108 at the scene
Send a little.It can be illustrated by equation below:
FSOIODn-1=MAX (FSOIODn+MaxDFP_Feed+MaxLineRxDelay+PeerToPeerJitter-
SubframeSizeIODn-1；GlobalStartOffset)
At IODn-1The size of data burst more than MaxDFP_Feed, MaxLineRXDelay and PeertoPeer
In particular cases, the FSO of IODn-1 should be equal to IOD to the summation of JitternOn FSO or shift to an earlier date in contrast.In other words
Say, in transmitting continuous time, the time difference of local time's system and be more than for performing the summation of the time of dynamic frame encapsulation
For send the persistent period of corresponding data subframe this in particular cases, the used time difference 704 is negative.
In brief, it is possible to calculate an optimal delivery time for data burst to be sent.Frame quilt very close to each other
It is otherwise attached on data burst, so that total size of frame to be sent keeps the least.
As in the mentioning at ET 200ecoPN 8DI of actual example, the IP67 that connects with PROFINET
The chain of chunk ancillary equipment, it takies 8 bytes in subframe size respectively.
If for MaxDFP_Feed and MaxLineRxDelay and assuming electricity for the time known to ERTEC200+
The a length of 100m of cable, then, when peer-to-peer network shake can reach 100ns, the operating procedure performing to be discussed in figure 6 needs
Minimum subframe size is 15 bytes.If peer-to-peer network shake bigger (as 300ns), the most only can reach the boy of 18 bytes
Frame sign.
Thus, during the operating procedure discussed in performing Fig. 6, each subframe of the ecoPN in data packet group needs 8 bytes
Gap.Gap " GAP " can be carried forward compensation again on this line.Therefore, the I/O control principle of each ecoPN
On between 6*80ns=560ns to 10*8=800ns (shaking according to accessible peer-to-peer network) and virtually without gap
Situation compare, need the more reception time for DFP frame.
During the operating procedure discussed in performing Fig. 6, although be less than the upstream of the equipment of 15-18 byte with subframe size
Neighboring devices " has postponed " this time laterly；But set by other downstream with the subframe size more than 15-18 byte
Standby (such as driving means, modularized equipment, such as ET200S or ET200M) compensate for this time, so that the frame on I/O control
Overall less.
Claims (10)
1. one kind in automated system by primary scene equipment by data from the secondary scene device transmission to receptor
(100) method, wherein said method is included in the following step on described primary scene equipment:
-generating the first data burst, wherein said first data burst has the process data of described primary scene equipment；
-receiving the second Frame from described secondary scene equipment, wherein said second Frame has with the described secondary scene
Second data burst of the process data of equipment；
-by dynamic frame encapsulation (DFP), the first Frame is sent on time described receptor (100), described first Frame
Including described first data burst and described second data burst,
Wherein can not be attached directly to described first after sending described first data burst at the latest at described second data burst
In the case of on data burst, by the way of punctual transmission, the transmission of described first Frame is made to postpone a time value, this
Sample calculates described time value, and i.e. after sending described first data burst, described second data burst can the most directly add
On described first data burst.
The most according to claim 1, method, wherein by described second Frame from described secondary scene equipment to described first
The transmitting continuous time of field apparatus counts in the calculating of described time value.
The most according to claim 2, method, the wherein said transmitting continuous time includes for by described secondary scene equipment
Send the time delay of described second Frame, and/or when receiving described second Frame by described primary scene equipment
Time delay, and/or the cable that described second Frame is between described secondary scene equipment and described primary scene equipment
The time delay that propagation time causes.
The most according to claim 1, method, wherein will be used for performing the encapsulation of described dynamic frame on described primary scene equipment
Time count in the calculating of described time value.
The most according to claim 1, method, wherein by the local in described primary scene equipment and described secondary scene equipment
The time difference of time system counts in the calculating of described time value.
The most according to claim 1, method, wherein said first Frame is sent to described reception by another field apparatus
Device (100), the data transmission of the most all field apparatus is the most time-synchronously carried out；It is wherein that the overall situation preset by all field apparatus
And/or the transmission of indivedual local start side-play amount as time delay；Wherein the data on a field apparatus are transmitted
Start at least to be delayed described transmission relative to the beginning that the data on adjacent field apparatus are transmitted and start side-play amount；Wherein
By described primary scene equipment as far back as described send to start carry out the transmission of described first Frame after side-play amount terminates.
Method the most according to claim 1, wherein when
-described second Frame from described secondary scene equipment to the transmitting continuous time of described primary scene equipment and/or
Time difference of the local time's system in-described primary scene equipment and described secondary scene equipment and/or
-on described primary scene equipment, perform the time that described dynamic frame encapsulates
Summation more than send the most described first data burst persistent period time, the most described time value is negative.
8. according to method according to any one of claim 1 to 7, Qi Zhongyou
-described second Frame from described secondary scene equipment to the transmitting continuous time of described primary scene equipment,
The time difference of the local time's system in-described primary scene equipment and described secondary scene equipment, and/or
-on described primary scene equipment, perform the time that described dynamic frame encapsulates, and/or
-on the equipment of the described secondary scene, send, in order to sending on time, the time value that described second Frame is postponed
The summation constituted deducts and sends persistent period of the most described first data burst and calculate described time value.
The most according to claim 8, method, when the described time value calculated is less than the transmission of described primary scene equipment
When starting side-play amount, then the transmission of described primary scene equipment is started side-play amount and be used as described time value.
10. a primary scene equipment, wherein said primary scene equipment is designed for receiving the data of secondary scene equipment also
And it is used for sending data to receptor (100), wherein said primary scene equipment is designed to carry out the following step:
-generating the first data burst, wherein said first data burst has the process data of described primary scene equipment,
-receiving the second Frame from described secondary scene equipment, wherein said second Frame has with the described secondary scene
Second data burst of the process data of equipment,
-by dynamic frame encapsulation, the first Frame being sent to described receptor (100) on time, described first Frame includes institute
State the first data burst and described second data burst,
Wherein can not be attached directly to described first after sending described first data burst at the latest at described second data burst
In the case of on data burst, by the way of punctual transmission, the transmission of described first Frame is made to postpone a time value, its
In so calculate described time value, i.e. after sending described first data burst, described second data burst can be the most direct
It is attached on described first data burst.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP20100195057 EP2466803B1 (en) | 2010-12-15 | 2010-12-15 | Method for data transmission in an automation system using dynamic frame packing |
| EP10195057.4 | 2010-12-15 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
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