CN109861894A - A kind of real-time ethernet using FDX Ethernet bandwidth - Google Patents
A kind of real-time ethernet using FDX Ethernet bandwidth Download PDFInfo
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- CN109861894A CN109861894A CN201811632830.0A CN201811632830A CN109861894A CN 109861894 A CN109861894 A CN 109861894A CN 201811632830 A CN201811632830 A CN 201811632830A CN 109861894 A CN109861894 A CN 109861894A
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Abstract
The present invention relates to a kind of real-time ethernet using FDX Ethernet bandwidth, media access control uses main website/slave station principle, and master node sends ethernet frame to slave node, and slave node extracts from these frames and be inserted into data；This method uses the function of Ethernet full duplex: the communication of twocouese all independently executes, each slave station is read and is write on the path that main website is sent, also, when ethernet frame passes through each intermediate slave station again on returning to main website path, the measurement for being sent to the received time is only executed.The present invention uses the different communication technology of quantity as few as possible, realize the PERCOM peripheral communication and internal communication with fieldbus layer, to realize that lean designs, it avoids using proprietary technology, but it is able to use the professional standard for most widely receiving and opening, less hardware means that MTBF can be extended and reduces development cost, unit price and logistics cost.Meanwhile these standardization are so that the pin connector and number of cables that use largely reduce.
Description
Technical field
It is specifically a kind of to utilize the real-time of FDX Ethernet bandwidth the invention belongs to digital communication network technique field
Ethernet.
Background technique
Fieldbus has become the integrated package of automatic technology, by a large amount of Practical experiments and test, has nowadays obtained
It must be widely applied.Just because of the universal of field bus technique, PC-Based Control system is just enable to be widely applied.However,
Although performance (the especially performance of the IPC) development of controller CPU is swift and violent, traditional field bus system just becomes control increasingly
" bottleneck " of system performance development processed.Be badly in need of technological innovation another factor be then due to traditional solution not very
It is ideal.Traditional scheme is usually all to form (periodic system) by several auxiliary systems by the control system that layer divides: i.e. real
The simple local firmware period of border control task, field bus system, the local expansion bus in I/O system or peripheral equipment.
Under normal circumstances, system response time is 3-5 times of controller cycle time.Level (i.e. net on bus system at the scene
Network controller) in, Ethernet often represents the level of technology development to a certain extent.This aspect technology newer at present is
Driving or I/O grades of application, i.e., generally use these fields of field bus system in the past.These application types require system tool
Standby good real-time capacity adapts to small data quantity communication, and price economy.EtherCAT can satisfy these demands, and
It can also be in I/O grades of realization technique of internet.
Make every effort to realize the real-time capacity of Ethernet there are many scheme.For example, CSMA/CD medium accesses process regimes, that is, prohibit
Only upper-layer protocol access process, and a solution as replaced timeslice or repeating query mode；Another solution is then
It is that Ethernet packet is distributed in such a way that private branch exchange system accurately controls the time.Although these schemes can be to a certain extent
Connected ethernet node is rapidly and accurately transferred a packet to, still, required for output or drive control device redirection
Time and read input data required for the time will be limited by concrete implementation mode.
If individual ethernet frame is used for each equipment, theoretically, available data rate is very low.For example,
Shortest ethernet frame is 84 bytes (including internal inter-packet gap IPG).If sending 4 bytes to drive periodic
Actual value and status information, and the bid value and control word information of 4 bytes are correspondingly received simultaneously, then, even bus is negative
When lotus is 100% (that is: infinitesimal driving response time), available data rate also can only achieve 4/84=4.8%.If pressed
According to the average response time estimation of 10 μ s, then rate would fall to 1.9%.To all transmission ethernet frames to each equipment (or
It is expected that frame come from each equipment) real-time ethernet mode for, all exist these limitation, but ethernet frame inside used in
Agreement is then exception.
Currently, making every effort to realize the real-time capacity of Ethernet there are many scheme.For example, CSMA/CD medium accesses process regimes,
Forbid upper-layer protocol access process, and a solution as replaced timeslice or polling mode；Another solution party
Case is then to distribute Ethernet packet in such a way that private branch exchange system accurately controls the time.
Although these schemes can rapidly and accurately transfer a packet to connected Ethernet section to a certain extent
Point, but the utilization rate of bandwidth is very low, especially for typical automation equipment, because even being for very small data
Amount, it is also necessary to send a complete ethernet frame.Moreover, output or drive control device redirect required for the time and
Read input data
The required time will be limited by concrete implementation mode.It is usually also required to using a strip bus, especially
In modular i/O system, it is as the K-bus bus of Beckhoff, and transmission can synchronize, and speed is also very fast,
But it still inevitably will increase the delay of communication bus transmission.
One standard fieldbus is commonly used in digital control system in the PERCOM peripheral communication of I/O and equipment room, thus by numerical control system
System is fully integratible into automated system.However, the different components (such as driver and position coder) in a digital control system
Between be also required to carry out complicated data transmission, so as to implement the control more demanding to real-time performance and adjust task.
In addition, internal unit is necessary for safe practice and control infrastructure carries out information exchange, needless to say shows and operate.Thus
The different communication technologys is used in the digital control system being connected with driving wire rod, so as to cause use a large amount of different plugs and
Cable.
In brief: the data length of each node transmission of the network of general industry communication is not grown, mostly all than ethernet frame
Minimum length wants small.And more new data will send out a frame to each node every time, cause the poor efficiency of bandwidth, network it is whole
Body performance also declines therewith.EtherCAT utilizes a kind of technology for being known as " rapidly transmission " (processing on the fly)
Problem more than improvement.
Summary of the invention
It is a kind of using FDX Ethernet bandwidth it is an object of the invention to provide in place of overcome the deficiencies in the prior art
Real-time ethernet, it is intended in the real-time ethernet technology for maximally utilising FDX Ethernet bandwidth.
The present invention solves its technical problem and adopts the following technical solutions to achieve:
A kind of real-time ethernet using FDX Ethernet bandwidth, it is characterised in that: media access control using main website/
Slave station principle, master node send ethernet frame to slave node, and slave node extracts from these frames and be inserted into data；
This method uses the function of Ethernet full duplex: the communication of twocouese all independently executes, and sends in main website
Each slave station is read and is write on path, also, when ethernet frame passes through each intermediate slave station again on returning to main website path, only executes hair
It is sent to the measurement of received time.
Moreover, the slave node is multiple and different slave station equipment, the ISO/IEC of standard can be sended and received
8802-3 ethernet frame.
Moreover, when ethernet frame passes to a slave station equipment, the incoming ethernet frame of slave station equipment processing, and
Before frame is passed to next slave station equipment, therefrom reads data and/or be inserted into the data of oneself；The last one in network segment
Slave station equipment reversely sends the ethernet frame handled completely along equipment chain, and by first slave station equipment the information of collection
Main website is returned to, main website receives information as Ethernet response frame.
Moreover, the different agreement between master node and multiple slave nodes is transmitted by single line.
The advantages and positive effects of the present invention are:
An important goal of the invention is the different communication technology using quantity as few as possible, realization and fieldbus
The PERCOM peripheral communication and internal communication of layer avoid using proprietary technology to realize that lean designs, but are able to use and most widely connect
By with open professional standard.In addition, the hardware of limited performance needs to be replaced with intelligence software function, and this why become can
Can, it is since modern multicore PC has very high computing capability, less hardware means that MTBF (Mean can be extended
Time) and reduction development cost, unit price and logistics cost.Meanwhile these standardization are so that the pin connector and electricity used
Cable quantity largely reduces.
Detailed description of the invention
Fig. 1 is whole slave station reference model；
Fig. 2 is CoE service model；
Fig. 3 is EtherCAT data link reference model；
Fig. 4 is EtherCAT PDU embedded ethernet frame；
Fig. 5 is physical layer general model.
Specific embodiment
The invention will be further described with reference to the accompanying drawing and by specific embodiment, and following embodiment is descriptive
, it is not restrictive, this does not limit the scope of protection of the present invention.
A kind of real-time ethernet using FDX Ethernet bandwidth, it is intended to maximally utilise FDX Ethernet band
Wide real-time ethernet, media access control use main website/slave station principle, and master node (usually control system) sends ether
For net frame to slave node, slave node extracts from these frames and is inserted into data；
This method uses the function of Ethernet full duplex: the communication of twocouese all independently executes, and sends in main website
Each slave station is read and is write on path, also, when ethernet frame passes through each intermediate slave station again on returning to main website path, only executes hair
It is sent to the measurement of received time.
From the point of view of Ethernet, an EtherCAT network segment is exactly a single ethernet device, it is received and hair
Send the ISO/IEC 8802-3 ethernet frame of standard；However this ethernet device is not limited to downstream microprocessor
Individual ethernet controller also may include a large amount of EtherCAT slave station equipment；
When ethernet frame passes to these equipment, they handle incoming ethernet frame, and next frame is passed to
Before a slave station equipment, therefrom reads data and/or be inserted into the data of oneself；The last one slave station equipment in network segment is along setting
Standby chain reversely sends the ethernet frame handled completely, and the information of collection is returned to main website by first slave station equipment, main
It stands and receives information as Ethernet response frame.
In view of can the ability of current ethernet technology meet real-time and safety, institute with higher message transmission rate
Having these all has the characteristics that IT field institute is familiar.In addition, the advantages of Ethernet is different agreement can be transmitted by single line,
This will substantially reduce number of cables used in system.
Although disclosing the embodiment of the present invention and attached drawing for the purpose of illustration, those skilled in the art can be managed
Solution: do not departing from the present invention and spirit and scope of the appended claims in, various substitutions, changes and modifications be all it is possible,
Therefore, the scope of the present invention is not limited to the embodiment and attached drawing disclosure of that.
Claims (4)
1. a kind of real-time ethernet using FDX Ethernet bandwidth, it is characterised in that: media access control using main website/from
It stands principle, master node sends ethernet frame to slave node, and slave node extracts from these frames and be inserted into data；
This method uses the function of Ethernet full duplex: the communication of twocouese all independently executes, in the path that main website is sent
Upper each slave station is read and is write, also, when ethernet frame passes through each intermediate slave station again on returning to main website path, only executes and be sent to
The measurement of received time.
2. the real-time ethernet according to claim 1 using FDX Ethernet bandwidth, it is characterised in that: the slave station
Node is multiple and different slave station equipment, can send and receive the ISO/IEC 8802-3 ethernet frame of standard.
3. the real-time ethernet according to claim 1 using FDX Ethernet bandwidth, it is characterised in that: work as Ethernet
When frame passes to a slave station equipment, the incoming ethernet frame of slave station equipment processing, and frame is being passed to next slave station
Before equipment, therefrom reads data and/or be inserted into the data of oneself；The last one slave station equipment in network segment is anti-along equipment chain
The ethernet frame handled completely to transmission, and the information of collection is returned to by first slave station equipment by main website, main website receives
Information is as Ethernet response frame.
4. the real-time ethernet according to claim 1 using FDX Ethernet bandwidth, it is characterised in that: master node
Different agreement between multiple slave nodes is transmitted by single line.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811632830.0A CN109861894A (en) | 2018-12-29 | 2018-12-29 | A kind of real-time ethernet using FDX Ethernet bandwidth |
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| CN201811632830.0A CN109861894A (en) | 2018-12-29 | 2018-12-29 | A kind of real-time ethernet using FDX Ethernet bandwidth |
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| CN109861894A true CN109861894A (en) | 2019-06-07 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101018115A (en) * | 2007-02-13 | 2007-08-15 | 张承瑞 | Real time synchronization network based on the standard Ethernet and its operating method |
| US20070189287A1 (en) * | 2006-02-10 | 2007-08-16 | Stephan Schultze | Method of operating a network |
| CN101170472A (en) * | 2007-10-26 | 2008-04-30 | 华中科技大学 | A digital control communication method based on Ethernet technology |
-
2018
- 2018-12-29 CN CN201811632830.0A patent/CN109861894A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070189287A1 (en) * | 2006-02-10 | 2007-08-16 | Stephan Schultze | Method of operating a network |
| CN101018115A (en) * | 2007-02-13 | 2007-08-15 | 张承瑞 | Real time synchronization network based on the standard Ethernet and its operating method |
| CN101170472A (en) * | 2007-10-26 | 2008-04-30 | 华中科技大学 | A digital control communication method based on Ethernet technology |
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Application publication date: 20190607 |