CN1557657A - Fibre optical CAN bus self-healing ring network interface device - Google Patents
Fibre optical CAN bus self-healing ring network interface device Download PDFInfo
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- CN1557657A CN1557657A CNA2004100126650A CN200410012665A CN1557657A CN 1557657 A CN1557657 A CN 1557657A CN A2004100126650 A CNA2004100126650 A CN A2004100126650A CN 200410012665 A CN200410012665 A CN 200410012665A CN 1557657 A CN1557657 A CN 1557657A
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Abstract
The present invention relates to one kind of ring fiber CAN bus self-cure network interface device, which includes one CPLD device EPM7128S, two light transmitters LEDR and LEDL, two light receivers PINR and PINL, one active quartz crystal ocillator PXO-660, network state LEDs D-sr and D-solution, and receiving state LED D-rx. The CPLD is connected to the CAN controller, and fiber loop via photoelectronic converter module PIN and LED. By means of the present invention and relevant fiber CAN network technology, ring fiber CAN bus self-cure network may be constituted. The present invention can raise the viability of ring fiber CAN bus network obviously, and has the features of simple structure, high reliability and convenient altering and maintenance.
Description
Technical field
The invention belongs to a kind of interface arrangement of optical fiber CAN bus, particularly a kind of interface arrangement of optical fiber CAN bus looped network, a kind of specifically optical fiber CAN bus self-healing looped network interface arrangement.
Background technology
CAN (Controller Area Network) bus is that German Bosch company beginning of the eighties is for solving a kind of serial data communication agreement that numerous data exchanges are developed in the automobile.Because its remarkable characteristic, the CAN bus becomes one of several the most promising fieldbuss of generally acknowledging at present.The transmission medium of CAN bus can be twisted-pair feeder, optical fiber and coaxial cable.When working environment is complicated especially,, adopt optical fiber to make transmission medium for improving the anti-interference resistance ability and the performance of CAN net.The optical fiber CAN net is as a kind of industrial bottom control local area network, and its topological structure is the same with local area network commonly used, and that basic topological structure has is always linear, annular and star.In the optical fiber CAN single loop network, the fault of node or link may cause the paralysis of network.
Summary of the invention
Technical matters to be solved by this invention is: for improving the survivability of optical fiber CAN looped network, provide a kind of optical fiber CAN bus self-healing looped network interface arrangement with self-healing function, to overcome above-mentioned deficiency.
To achieve these goals, the present invention constitutes optical fiber ring network by a plurality of CAN controllers, is characterized in: settle the optical fiber CAN self-healing looped network interface circuit based on programmable logic device (PLD) (CPLD) between each CAN controller and optical fiber loop;
CPLD (CPLD) EPM7128S, two optical transmitter LEDR, LEDL that above-mentioned optical fiber CAN self-healing looped network interface circuit is produced by a slice altera corp, two optical receiver PINR, PINL, an active quartz oscillator PXO-660 constitutes, wherein CPLD is connected with TX with CAN controller sending and receiving end RX, CPLD also is connected with optical fiber loop by photoelectric conversion module PIN, LED, and active quartz oscillator is connected with the clk0 end of CPLD;
Also be connected with network state light-emitting diode D_sr, D_sl and receiving condition light-emitting diode D_rx on the above-mentioned optical fiber CAN self-healing looped network interface circuit.
Function of the present invention is: (1) when optical fiber dual ring communication just often, each transmitter is selected side data is sent.(2) when the simple optical fiber fault, the downstream node interface circuit is realized loopback, and the downstream node optical transmitter is selected homonymy optical receiver data forwarding.(3) when between arbitrary node during two fiber failures, two nodes that then link to each other with fiber cut point are carried out loop fuctions.Two node optical transmitters are all selected homonymy optical receiver data forwarding.This self-healing function guarantees under failure condition, still can keep the continuity of looped network.Behind the trouble removal, switch switch and return the home position automatically.(4) realize the selective reception of node CAN controller data, its principle is: for suitable, conter clockwise two channel datas that each node receives, select the preferential channel data that arrives to receive.(5) realize that the node data selection sends, its principle is: for the major joint in the CAN network (sending node), select the data of this node CAN controller sending end (TX) to send, can eliminate the self-excitation phenomena of optical fibre ring CAN bus network, guarantee that looped network is not blocked; For in the CAN network from node (receiving node), when network is working properly, select side data is sent; For in the CAN network from node (receiving node), offside optical-fibre channel fault in the network is then selected to send with side data.(6) differentiate each passage frame initial sum frame end, differentiate whether bus is idle, whether network fault.As when judging that left side optical receiver PINL has Frame transmitting, produce the left side and send Data Labels flag_l and network service Status Flag sync_l, represent that respectively bus is busy and network is working properly.
The present invention realizes the optical fiber CAN bus self-healing function, uses the self-healing control interface of CPLD, can set up the optical fiber CAN bus self-healing looped network, and it will improve the survivability of optical fiber CAN bus network.The interface circuit singualtion will be simplified circuit greatly, improve the reliability of circuit.Owing to use the CPLD device, will provide convenience for modification, debugging and the update of interface circuit.
Description of drawings
Fig. 1 is an optical fiber CAN bus self-healing looped network constructional drawing.
Fig. 2 is a self-healing working strategies scheme drawing.
Fig. 3 is the I/O mouth scheme drawing of CPLD self-healing control interface device.
Fig. 4 is based on CPLD looped network self-healing control interface apparatus structure block diagram.
The specific embodiment
The invention will be further described below in conjunction with drawings and Examples, but following embodiment should not be construed as limitation of the present invention.
The present invention solves the problems of the technologies described above the technical scheme that is adopted: that realizes above-mentioned functions control looped network self-healing interface circuit selects the CPLD of U.S. altera corp device EPM7128SLC84-15 for use, develops software with MAX+plusII and designs.CPLD self-healing control interface unit is made up of four parts: frequency divider, center situation machine, transmission data selector, reception data selector are formed.Adopt CPLD to be connected with TX with node CAN controller sending and receiving end RX, CPLD is connected with optical fiber loop with LED by PIN simultaneously.Whole self-healing control interface device clock is provided by active quartz oscillator PXO-660, and its oscillation frequency is 20MHz.
As Fig. 1 is optical fiber CAN bus self-healing looped network constructional drawing, this network has two optical fiber loops---up time needle ring and inverse time needle ring, each node CAN controller links to each other with the dicyclo optical networking by the self-healing control interface, the CPLD that the self-healing control interface is produced by altera corp (CPLD) EPM7128S, two optical transmitter LEDR, LEDL, two optical receiver PINR, PINL form.
As shown in Figure 2, the Self healing Strategy of optical fiber CAN self-healing looped network control interface device is: (1) when optical fiber dual ring communication just often, shown in Fig. 2 (a), each node right-hand member optical transmitter LEDR transmits the data of left end optical receiver PINL, the signal cw transmits; In like manner LEDL transmits the data of PINR, and the signal conter clockwise transmits, and promptly transmitter is selected the offside data forwarding.(2) when the simple optical fiber fault, as Fig. 2 (b), C node self-healing control interface in downstream is realized loopback, because left side optical receiver PINL no signal, right-hand member optical transmitter LEDR selects homonymy optical receiver PINR data forwarding.(3) when between arbitrary node during two fiber failures, as Fig. 2 (c), when optical fiber is cut off between the BC node; Then two node self-healing control interfaces linking to each other with fiber cut point of two of B, C are carried out loop fuctions; At this moment, the signal AC from A to C then earlier through the up time needle ring to B, cross A, D through the inverse time needle ring again and arrive C; Signal CA then still transmits through the up time needle ring; Under failure condition, the self-healing control interface guarantees the continuity of optical fiber CAN looped network; Behind the trouble removal, switch switch and return the home position automatically.
As shown in Figure 3, the annexation of the I/O mouth of self-healing control interface device is: CPLD input and output pin pin_l, led_l, led_r, pin_r link to each other with photoelectric conversion module PINL, LEDL, LEDR, PINR respectively; Output input pin txd, the rxd of CPLD links to each other with data sending terminal TX, the receiving end RX of CAN controller respectively; On behalf of this node CAN controller TX0, the output pin flag_txd=1 of CPLD sending Frame; On behalf of left channel, output pin flag_l=1 sending Frame; On behalf of right channel, output pin flag_r=1 sending Frame.Output pin sync_l is a left side network service Status Flag, and output pin sync_r is a right side network service Status Flag.When left passage just often, output pin sync_l=" 1 ", it is bright to drive network state light-emitting diode D_sl; When right passage just often, output pin sync_r=" 1 ", it is bright to drive network state light-emitting diode D_sr; If network state light-emitting diode D_sr or D_sl go out, the corresponding optical-fibre channel of expression network is out of order.When this node CAN controller selected left channel data to receive, receiving condition sign pin rx_l/r was a high level, and when this node CAN controller selected right channel data to receive, receiving condition sign pin rx_l/r was a low level.Input pin reset is a reset terminal, and low level is effective; Clk0 is the clock input pin, and this pin links to each other with active crystal oscillator mouth, and the clock frequency of active crystal oscillator is 20MHz.
As shown in Figure 4, the CPLD in the control looped network self-healing control interface device is made up of frequency divider, center situation machine, transmission data selector, four modules of reception data selector.
The function of frequency divider is: CPLD is imported the 20MHz clock frequency be transformed to the 1MHz clock frequency.This is that each node CAN controller and CPLD interface adopt independently work clock because in the optical fiber CAN self-healing looped network.State machine generation transmission data mode flag changes in order to make, two data finders switchings are synchronous with the transmission of CAN controller data, correctly the clock of selection mode machine.Because to send baud rate is 125Kbit/s to the CAN network data, state machine clock rxclk speed is designed to data, and to transmit 8 times of baud rate be 1M.It is synchronous to realize that so not only network data transmits, and can also repeatedly read data in a bit period, to improve the antijamming capability of network.
Center situation machine function is: (1) detects the frame initial sum frame end of CAN Frame, produces corresponding transmission Data Labels signal flag_txd, flag_r and flag_l.According to CAN 2.0B agreement, CAN network data frame is made up of 7 different potential fields: promptly frame is initial, the arbitration field, and controlling field, data fields, the field is replied in the CRC field, frame end.Data fields length can be 0-8 byte.Start of frame bits is a dominance position low level ' 0 '; Frame end is by 7 recessive position ' sequences that 1' forms.(2) produce network service Status Flag sync_r and sync_l.The center situation machine is made up of three state machines: this node CAN controller state machine, left channel status machine and right channel status machine.Whether they differentiate each passage (TX, PIN_L and PIN_R) respectively has data to transmit.The explanation of state machine everywhere is an example with this node CAN controller state machine all below.
In each state machine, when bus was idle, state machine was in Idle state idle, if arrive in the rxclk upper edge, when detecting txd=0, state machine will send Data Labels set flag_txd=" 1 "; And when arriving in rxclk the 5th upper edge, the txd data are read once more, if txd=" 0 " condition is still set up, represent the initial arrival of real frame; Otherwise flag_txd=" 0 ", state machine turns to Idle state idle simultaneously, waits for the initial arrival of frame.After the initial arrival of real frame, 8 clock period of the every mistake of rxclk (1M), the data bit on the CAN bus is detected, guarantee to detect in data bit (bit period) central authorities at every turn.Txd detected " 1 " when continuous 7 times, expression real " frame end " arrives, and sends the Data Labels flag_txd=" 0 " that resets, and waits for the initial arrival of frame next time.Otherwise state machine is in frame end judges state.
The important evidence of carrying out looped network self-healing when network service state sync_r, sync_l.As mentioned above, when left and right sides passage sends data mode sign flag=" 1 ", each channel network communications status sync=" 1 ", network state light-emitting diode D_sr, D_sl are bright; When frame end arrival flag=" 0 ", start network service state counter count, its clock is rxclk=1MHz, when counting machine is 30000 (30ms), sync=" 0 ", network state light-emitting diode D_sr, D_sl go out, expression continues to detect less than Frame, network failure.If can detect Frame initial (flag set) in 30ms, the network service Status Flag continues sync=" 1 ".Counting machine count completely is worth the interframe shortest time interval for estimation.
The function that sends data selector and reception data selector is that the realization link is built (being channel selecting).Short as far as possible for making link build the time, use two data finders of highest frequency clock (20MHz) control.
In sending data selector, the input data channel is 3 road txd, pin_l and pin_r.Each channel data has different priorities.Priority is set to: when this node sends data (txd=" 0 " or flag_txd=" 1 "), send the data of this TX end in the optical fiber dual ring, i.e. led_r=txd, led_l=txd.If this node do not send data, then select to send data according to sync_r and sync_l, when left and right sides passage all just often, select side data to be sent led_r=pin_l, led_l=pin_r; If certain channel failure does not receive side data, then select this side data to send led_l=pin_l, led_r=pin_r.Not only realize network self-healing in view of the above, also eliminated the looped network obstructing problem.
In receiving data selector, setting left passage is first-selected receiving cable; When left channel data not then when flag_l=" 0 " or left channel failure, do not need human intervention to select right passage to receive automatically.Realize in view of the above receiving and optimize (selecting the preferential channel data that arrives to receive), and the self-healing function of optical fiber CAN bus dual-ring network.When receiving node CAN controller selected left passage to receive, D_rx was luminous for the receiving condition light-emitting diode, otherwise D_rx goes out.
The present invention confirms after tested, the optical fiber CAN self-healing looped network just often, each passage all has data to transmit, network state light-emitting diode D_sr, D_sl continue luminous; When the single channel fault was set, the inner loopback of realizing of downstream node self-healing control interface device was selected the homonymy data forwarding; When the binary channel fault was set, the self-healing control interface device of two nodes that link to each other with the trouble point was all realized loopback.The optical fiber CAN self-healing looped network that is made of CPLD self-healing control interface device has very high survivability.
The content that is not described in detail in this specification sheets is this professional domain technical personnel known prior art.
Claims (8)
1, a kind of optical fiber CAN bus self-healing looped network interface arrangement, constitute optical fiber ring network by a plurality of CAN controllers, it is characterized in that: between each CAN controller and optical fiber loop, settle an optical fiber CAN self-healing looped network interface arrangement based on programmable logic device (PLD) (CPLD).
2, optical fiber CAN bus self-healing looped network interface arrangement as claimed in claim 1, it is characterized in that: CPLD (CPLD) EPM7128S, two optical transmitter LEDR, LEDL that optical fiber CAN self-healing looped network interface arrangement is produced by a slice altera corp, two optical receiver PINR, PINL, an active quartz oscillator PXO-660 constitutes, wherein CPLD is connected with the CAN controller, CPLD also is connected with optical fiber loop by photoelectric conversion module PIN, LED, and active quartz oscillator is connected with the clk0 end of CPLD.
3, optical fiber CAN bus self-healing looped network interface arrangement as claimed in claim 1 is characterized in that: also have network state light-emitting diode D_sr, D_sl and receiving condition light-emitting diode D_rx in the optical fiber CAN self-healing looped network interface arrangement.
4, optical fiber CAN self-healing looped network interface arrangement as claimed in claim 1 or 2, it is characterized in that: comprise among the CPLD that frequency divider, center situation machine, data send finder, four modules of data sink finder, wherein the input end of frequency divider is connected with active quartz oscillator, and it is exported to the center situation machine oscillation source is provided; The center situation machine receives the txd signal of CAN controller, also passes through the signal that photoelectric conversion module PIN receives fiber optic network, sends a signal to data and sends finder and data sink finder; Data send finder also receives fiber optic network by photoelectric conversion module PIN signal, output signal to electrooptic conversion module LED; The data sink finder also receives the signal of fiber optic network by photoelectric conversion module PIN, its output is connected with the rxd end of CAN controller.
5, optical fiber CAN self-healing looped network interface arrangement as claimed in claim 4 is characterized in that: utilize frequency divider that CPLD is imported the 20MHz clock frequency and be transformed to the 1MHz clock frequency, use for the center situation machine.
6, optical fiber CAN self-healing looped network interface arrangement as claimed in claim 4, it is characterized in that: center situation machine module realizes CAN network data frame " frame is initial " and " frame end " differentiation, realize that in proper order 3 passages send resetting and set of Data Labels flag_txd, flag_r and flag_l, and producing network service status signal sync_r, sync_l, they are important evidence that data selector carries out looped network self-healing.
7, optical fiber CAN self-healing looped network interface arrangement as claimed in claim 4 is characterized in that: in sending data selector, select to send data according to flag_txd, sync_r and sync_l, when flag_txd=" 1 ", select the data of txd end to send; When flag_txd=" 1 ", sync_r and sync_l=" 1 ", select side data to be sent led_r=pin_l, led_l=pin_r; If certain channel failure does not receive side data, then select this side data to send led_l=pin_l, led_r=pin_r.Network self-healing and looped network obstructing problem have been realized in view of the above.
8, optical fiber CAN self-healing looped network interface arrangement as claimed in claim 4 is characterized in that: in receiving data selector, according to flag_l and flag_r selective reception passage; Selecting among flag_l and the flag_r is earlier that zero person's passage receives, realize in view of the above receiving and optimize (selecting the preferential channel data that arrives to receive), and the self-healing function of optical fiber CAN bus dual-ring network.When receiving node CAN controller selected left passage to receive, D_rx was luminous for the receiving condition light-emitting diode, otherwise D_rx goes out.
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| CN1305255C (en) * | 2005-03-17 | 2007-03-14 | 上海交通大学 | Controller local area network (LAN) bus communication hub based on optical fibre dielectric communication |
| CN100382535C (en) * | 2004-01-21 | 2008-04-16 | 夏普株式会社 | Data communications device, data communications system, data communications method, data communications computer program |
| CN101908929A (en) * | 2010-07-12 | 2010-12-08 | 中电普瑞科技有限公司 | Method and device for real-time detection and handling of open circuit fault of fiber channel of industrial Ethernet |
| CN103345845A (en) * | 2013-06-15 | 2013-10-09 | 汕头市鼎安电子科技有限公司 | Traffic signal control system with self-healing function |
| CN104394053A (en) * | 2014-11-12 | 2015-03-04 | 南京理工大学 | A wiring method for enhancing the reliability of a LIN bus and a LIN bus system |
| CN105500372A (en) * | 2016-01-14 | 2016-04-20 | 南京熊猫电子股份有限公司 | Modularized welding robot control system based on CAN looped network and control method thereof |
| CN106888142A (en) * | 2017-03-09 | 2017-06-23 | 广州广哈通信股份有限公司 | A kind of E1 dual-ring networks with ring self-healing function |
| CN107302484A (en) * | 2017-06-12 | 2017-10-27 | 深圳市诺龙技术股份有限公司 | A kind of method and apparatus of looped network self-healing |
| CN114205181A (en) * | 2021-11-30 | 2022-03-18 | 中国电子科技集团公司第三十四研究所 | Closed loop network and automatic routing method thereof |
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| CN100382535C (en) * | 2004-01-21 | 2008-04-16 | 夏普株式会社 | Data communications device, data communications system, data communications method, data communications computer program |
| CN1305255C (en) * | 2005-03-17 | 2007-03-14 | 上海交通大学 | Controller local area network (LAN) bus communication hub based on optical fibre dielectric communication |
| CN101908929A (en) * | 2010-07-12 | 2010-12-08 | 中电普瑞科技有限公司 | Method and device for real-time detection and handling of open circuit fault of fiber channel of industrial Ethernet |
| CN103345845A (en) * | 2013-06-15 | 2013-10-09 | 汕头市鼎安电子科技有限公司 | Traffic signal control system with self-healing function |
| CN103345845B (en) * | 2013-06-15 | 2016-01-27 | 汕头市鼎安电子科技有限公司 | A kind of traffic signal control system with self-healing function |
| CN104394053A (en) * | 2014-11-12 | 2015-03-04 | 南京理工大学 | A wiring method for enhancing the reliability of a LIN bus and a LIN bus system |
| CN105500372A (en) * | 2016-01-14 | 2016-04-20 | 南京熊猫电子股份有限公司 | Modularized welding robot control system based on CAN looped network and control method thereof |
| CN106888142A (en) * | 2017-03-09 | 2017-06-23 | 广州广哈通信股份有限公司 | A kind of E1 dual-ring networks with ring self-healing function |
| CN106888142B (en) * | 2017-03-09 | 2020-01-24 | 广州广哈通信股份有限公司 | E1 double-ring network with ring self-healing function |
| CN107302484A (en) * | 2017-06-12 | 2017-10-27 | 深圳市诺龙技术股份有限公司 | A kind of method and apparatus of looped network self-healing |
| CN114205181A (en) * | 2021-11-30 | 2022-03-18 | 中国电子科技集团公司第三十四研究所 | Closed loop network and automatic routing method thereof |
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