CN109104303A - A kind of automatic configuration system and method for CAN bus ID - Google Patents
A kind of automatic configuration system and method for CAN bus ID Download PDFInfo
- Publication number
- CN109104303A CN109104303A CN201810805073.6A CN201810805073A CN109104303A CN 109104303 A CN109104303 A CN 109104303A CN 201810805073 A CN201810805073 A CN 201810805073A CN 109104303 A CN109104303 A CN 109104303A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/08—Configuration management of networks or network elements
- H04L41/0803—Configuration setting
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L61/00—Network arrangements, protocols or services for addressing or naming
- H04L61/50—Address allocation
- H04L61/5038—Address allocation for local use, e.g. in LAN or USB networks, or in a controller area network [CAN]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L2012/40208—Bus networks characterized by the use of a particular bus standard
- H04L2012/40215—Controller Area Network CAN
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- Computer Networks & Wireless Communication (AREA)
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Abstract
The invention discloses a kind of CAN bus ID automatic configuration systems, it include 1~N of bus control unit and node in CAN bus equipment, bus control unit and all nodes are hung in CAN bus, it is connected respectively with CAN bus signal of communication CAN_H and CAN_L, respectively increase the serial receiving and transmitting signal of a pair of RS422 on bus control unit and each node in CAN bus, nodes all in bus are connected in series by RS422 serial receiving and transmitting signal, connect into the topological structure of daisy chain type.The method that CAN bus ID is automatically configured is carried out using above-mentioned CAN bus ID automatic configuration system the present invention also provides a kind of.The present invention has the advantage that 1, CAN bus ID method of automatic configuration is simple and convenient compared with prior art, and the configuration of all node ID numbers is automatically performed by system, without being configured and manual intervention.2, system cable cabling is simple, and ID configures signal and is not necessarily to independent cable routing.
Description
Technical field
The present invention relates to industry spot field, in particular to a kind of fieldbus-CAN (Controller Area
Network) ID (Identification) automatic configuration system and method for bus.
Background technique
With the fast development of microelectronics, automatic control technology, computer technology and the communication technology, digitlization is generally answered
Industrial field device is used, and penetrates into automation field as a kind of trend.Field bus technique also comes into being, and will have
There are various field devices, the device of control function and information processing capability to connect into network system.
As the CAN bus of one of fieldbus, be by German Bosch company in 1981 formulate, have it is highly reliable,
The features such as low cost, using flexible.It is not only generallyd use by automotive electronics, is also gradually widely used in automatic control, intelligence
The fields such as observing and controlling, defence and military.
The signal transmission medium of CAN bus is twisted pair, and traffic rate reaches as high as 1Mbps, and communication distance is farthest reachable
10km, the node on same bus are up to 110.The signal transmission of CAN bus has strong anti-interference ability, and supports more
Master mode work, supports point-to-point, point to multi--point and broadcast mode sending and receiving data, have reliability outstanding, real-time and
Flexibility.
Since CAN bus node is hung on same bus, each node has unique ID number, and system passes through ID number
Bus node is identified.There are mainly two types of traditional CAN bus ID configuration modes, and one is by the way of toggle switch
ID number is configured.Although this mode can guarantee the consistency of system software program, need operator to system
Carry out manual intervention.Another method is ID number to be cured in program, or ID number is solidified in memory device.It is this
Method will lead to program version diversification, cause to need to be managed dimension to ID number using special equipment during later maintenance
Shield.There is certain deficiency in use in the above both methods.
Summary of the invention
Technical problem to be solved by the present invention lies in provide a kind of simple and convenient CAN bus ID automatic configuration system
And method, the configuration of all node ID numbers are automatically performed by system, without being configured and manual intervention.
The present invention is to solve a kind of above-mentioned technical problem: CAN bus ID automatic configuration system by the following technical programs,
It include 1~N of bus control unit and node in CAN bus equipment, bus control unit and all nodes are hung in CAN bus,
It is connected respectively with CAN bus signal of communication CAN_H and CAN_L, it is each on the bus control unit and each node in CAN bus
Increase the serial receiving and transmitting signal of a pair of RS422, be connected in series nodes all in bus by the serial receiving and transmitting signal of RS422, connects
At the topological structure of daisy chain type.
As the structure of optimization, ID setting signal and CAN bus signal of communication only need to increase in same root cable routing
Add 2 core wires, without individually separately walking cable.
As specific scheme, " RS422_ receipts " signal of " RS422_ hair " signal end connecting node 1 of bus control unit
End, " RS422_ receipts " signal end of " RS422_ hair " signal end connecting node 2 of node 1, and so on, present node
" RS422_ receipts " signal end connects " RS422_ hair " signal end of a node；And " RS422_ hair " signal end of present node
" RS422_ receipts " signal end of next node is connected, finally, the last one node-node N " RS422_ hair " believes in bus
Number end is connected to " RS422_ receipts " signal end of bus control unit.
Carry out what CAN bus ID was automatically configured using above-mentioned CAN bus ID automatic configuration system the present invention also provides a kind of
Method, after CAN bus device power, bus control unit starts to send ID configuration-direct and initial ID number that (initial ID number can be set
For " ID+0 "), then initial ID number is added 1 after node 1 receives ID configuration-direct and initial ID number, then the ID number of node 1 is arranged
For " ID+1 ", the ID number of ID configuration-direct and node 1 is then sent to node 2, and so on, when certain node in bus connects
After the ID configuration-direct and the ID number that receive node transmission, the ID number received is added 1 as the ID number of present node and is carried out
Setting, is then sent to next node for the ID number of ID configuration-direct and present node, until the last one node in bus
After the completion of ID configuration, the ID number of ID configuration-direct He the node is sent to bus control unit, if bus control unit is limiting
The ID number of ID configuration-direct and node is received in time, then ID automatically configures success.
As further embodiment, CAN bus ID method of automatic configuration further includes following step: the node connection in bus
In, signal open circuit fault occurs between m-th node and the M+1 node, will cause the failure of system identifier configuration-direct, if bus
Controller is not received by the ID number of ID configuration-direct and node within a limited period of time, will start bus signals testing for continuity stream
Journey.
As further embodiment, the bus signals testing for continuity process includes the following steps:
When initialization, first initial ID number, initial ID number are set to " ID+0 ", and when detection, the ID number of node is added 1 as current
Then the ID number of detection node sends inquiry instruction by CAN bus chain road direction present node by bus control unit, if limiting
In fixing time, bus control unit can receive correct inquiry response information by CAN bus, then continue to next node
Inquiry；If not receiving response message within a limited period of time, system report bus signals open circuit fault and to off position into
Row positioning.
The present invention has the advantage that compared with prior art
1, CAN bus ID method of automatic configuration is simple and convenient, and the configuration of all node ID numbers is automatically performed by system,
Without being configured and manual intervention.
2, system cable cabling is simple, and ID configures signal and is not necessarily to independent cable routing.ID configuration signal is communicated with CAN bus
Signal can in same root cable cabling, it is only necessary in the cable increase by 2 core wires.
Detailed description of the invention
Fig. 1 is that CAN bus of embodiment of the present invention ID automatically configures signal connection schematic diagram；
Fig. 2 CAN bus of embodiment of the present invention ID automatically configures flow chart；
Fig. 3 is CAN bus signal open circuit fault schematic diagram of the embodiment of the present invention；
Fig. 4 is CAN bus signal open circuit overhaul flow chart of the embodiment of the present invention.
Specific embodiment
It elaborates below to the embodiment of the present invention, the present embodiment carries out under the premise of the technical scheme of the present invention
Implement, the detailed implementation method and specific operation process are given, but protection scope of the present invention is not limited to following implementation
Example.
Fig. 1 be CAN bus ID automatically configure signal connection schematic diagram, in CAN bus equipment include bus control unit and
1~N of node, bus control unit and all nodes are hung in CAN bus, respectively with CAN bus signal of communication CAN_H and CAN_
L is connected.To realize that CAN bus ID automatically configures function, respectively increase a pair of RS422 string on bus control unit and each node
Row receiving and transmitting signal." RS422_ receipts " signal end of " RS422_ hair " signal end connecting node 1 of bus control unit, node 1
" RS422_ receipts " signal end of " RS422_ hair " signal end connecting node 2.The rest may be inferred, " RS422_ receipts " signal of present node
End connects " RS422_ hair " signal end of a upper node；And " RS422_ hair " signal end of present node connects next node
" RS422_ receipts " signal end.Finally, the last one node-node N " RS422_ hair " signal end is connected to bus in bus
" RS422_ receipts " signal end of controller.In this way, bus control unit and institute by the serial receiving and transmitting signal of RS422, in CAN bus
There is node to join end to end, has connected into the topological structure of daisy chain type.
Fig. 2 is that CAN bus ID automatically configures flow chart, and after CAN bus device power, bus control unit starts to send ID
Configuration-direct and initial ID number (initial ID number can be set to " ID+0 ").When node 1 receive bus control unit ID configuration-direct and
After initial ID number, initial ID number is added 1, then the ID number of node 1 is set as " ID+1 ", then by ID configuration-direct and node 1
ID number is sent to node 2.The rest may be inferred, when certain node in bus receives the ID configuration-direct and ID number that a upper node is sent
Afterwards, the ID number received is added 1 as the ID number of present node to be configured, then by the ID of ID configuration-direct and present node
Number it is sent to next node.After the completion of the last one node ID configuration in bus, by ID configuration-direct and the node
ID number is sent to bus control unit, and bus control unit detects the ID for whether receiving ID configuration-direct and node within a limited period of time
Number, if receiving the ID number of ID configuration-direct and node, ID automatically configures success；If not receiving the ID of ID configuration-direct and node
Number, then start bus signals testing for continuity process.
Fig. 3 is CAN bus signal open circuit fault schematic diagram, CAN bus equipment in use, occur it is more be by
In the bus signals connector poor contact of node, signal open circuit fault is caused.In node connection in Fig. 3 in bus, m-th
Signal open circuit fault occurs between node and the M+1 node, will cause the failure of system identifier configuration-direct.If bus control unit exists
It is not received by the ID number of ID configuration-direct and node in limiting time, will start bus signals testing for continuity process.
Fig. 4 is CAN bus signal open circuit overhaul flow chart.When initialization, first (initial ID number is set to " ID+ to initial ID number
0").When detection, the ID number of node is added into 1 ID number as current detection node, CAN bus is then passed through by bus control unit
Chain road direction present node sends inquiry instruction.If within a limited period of time, bus control unit can be received correctly by CAN bus
Inquiry response information, then next node is continued to inquire；If not receiving response message within a limited period of time, it is
System report bus signals open circuit fault simultaneously positions off position.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (7)
1. a kind of CAN bus ID automatic configuration system, which is characterized in that include bus control unit and section in CAN bus equipment
1~N of point, bus control unit and all nodes hang in CAN bus, respectively with CAN bus signal of communication CAN_H and CAN_L
It is connected, respectively increases the serial receiving and transmitting signal of a pair of RS422 on the bus control unit and each node in CAN bus, pass through
The serial receiving and transmitting signal of RS422 is connected in series nodes all in bus, connects into the topological structure of daisy chain type.
2. CAN bus ID automatic configuration system according to claim 1, which is characterized in that CAN bus signal of communication and ID
Setting signal cabling in same root cable.
3. CAN bus ID automatic configuration system according to claim 1, which is characterized in that " the RS422_ of bus control unit
" RS422_ receipts " signal end of hair " signal end connecting node 1, " RS422_ hair " signal end connecting node 2 of node 1
" RS422_ receipts " signal end, and so on, " RS422_ receipts " signal end of present node connects the " RS422_ of a node
Hair " signal end；And " RS422_ receipts " signal end of " RS422_ hair " the signal end connection next node of present node, finally,
The last one node-node N " RS422_ hair " signal end is connected to " RS422_ receipts " signal of bus control unit in bus
End.
4. a kind of carry out CAN bus ID certainly using the described in any item CAN bus ID automatic configuration systems of the claims 1-3
The method of dynamic configuration, which is characterized in that after CAN bus device power, bus control unit starts to send ID configuration-direct and just
Beginning ID number, then initial ID number is added 1 after node 1 receives ID configuration-direct and initial ID number, then by ID configuration-direct and section
The ID number of point 1 is sent to node 2, and so on, when certain node in bus receives the ID configuration-direct that a upper node is sent
After ID number, the ID number received is added 1 as the ID number of present node and is configured, then by ID configuration-direct and works as prosthomere
The ID number of point is sent to next node, after the completion of the last one node ID configuration in bus, by ID configuration-direct and is somebody's turn to do
The ID number of node is sent to bus control unit, if bus control unit receives the ID of ID configuration-direct and node within a limited period of time
Number, then ID automatically configures success.
5. CAN bus ID method of automatic configuration according to claim 4, which is characterized in that initial ID number is set as " ID+
0”。
6. CAN bus ID method of automatic configuration according to claim 4, which is characterized in that further include following step: bus
On node connection in, between m-th node and the M+1 node occur signal open circuit fault, will cause system identifier configure refer to
Failure is enabled, if bus control unit is not received by the ID number of ID configuration-direct and node within a limited period of time, will start bus letter
Number testing for continuity process.
7. CAN bus ID method of automatic configuration according to claim 6, which is characterized in that the bus signals open circuit inspection
Process is looked into include the following steps:
When initialization, first initial ID number, initial ID number are set to " ID+0 ", and when detection, the ID number of node is added 1 as current detection
Then the ID number of node sends inquiry instruction by CAN bus chain road direction present node by bus control unit, if when limiting
In, bus control unit can receive correct inquiry response information by CAN bus, then continue to ask to next node
It asks；If not receiving response message within a limited period of time, system report bus signals open circuit fault simultaneously carries out off position
Positioning.
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| CN201810805073.6A CN109104303A (en) | 2018-07-20 | 2018-07-20 | A kind of automatic configuration system and method for CAN bus ID |
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Cited By (4)
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| CN109799758A (en) * | 2019-01-29 | 2019-05-24 | 上海度普新能源科技有限公司 | A kind of CAN bus application system and the method for numbering serial for handling node |
| CN109800205A (en) * | 2019-01-25 | 2019-05-24 | 北京鼎汉技术股份有限公司 | The system and method that subway platform door ID number is arranged automatically |
| CN110086887A (en) * | 2019-05-14 | 2019-08-02 | 上海泽远信息科技有限公司 | A kind of multifunctional monitoring system for aerial suspension ohject displacement |
| CN110647127A (en) * | 2019-10-17 | 2020-01-03 | 厦门高瑞特电气自动化有限公司 | Module combined power process control device and initialization configuration method thereof |
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Application publication date: 20181228 |