CN103297308B - CC-Link remote IO station catches method and the equipment of data - Google Patents
CC-Link remote IO station catches method and the equipment of data Download PDFInfo
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- CN103297308B CN103297308B CN201310155906.6A CN201310155906A CN103297308B CN 103297308 B CN103297308 B CN 103297308B CN 201310155906 A CN201310155906 A CN 201310155906A CN 103297308 B CN103297308 B CN 103297308B
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Abstract
The present invention provides a kind of CC-Link medium-long range IO station and obtains other method from station data and remote IO station. Wherein method comprises: remote IO station intercepts the poll response that target slave returns to main website; Remote IO station directly returns to from the target slave listened to the poll response of main website and catches desired data. Wherein remote IO station comprises: intercepts module and catches module. The present invention, catches desired data owing to remote IO station directly returns to from target slave the poll response of main website, there is not main website and forward this link in the middle of this, therefore can improve remote IO station and obtain in same CC-Link other from the speed of station data.
Description
Technical field
The present invention relates to automation control area, particularly relate to method and equipment that a kind of CC-Link remote IO station catches data, specifically refer to the method for a kind of CC-Link medium-long range IO station acquisition its other from station data and remote IO station.
Background technology
CC-Link (Control&CommunicationLink, control and communication link system) as the field bus technique of a kind of opening, mainly lay particular emphasis on the fieldbus numeral communication technology of net control in automation control system, its station related to comprises: master station and follow station, wherein comprise again from station: remote I/O (Input/output, input and output) stand, remote device station, intelligence equipment and local station, wherein remote IO station can carry out the I/O of " bit-type " data, remote device station not only carries out the I/O of " bit-type " data, the I/O of " font " data can also be carried out, intelligent device station has instantaneous transfer function, local station is actual is a main website for subsequent use, and these both can use from station (providing data side) as data source from station, should can also do to use from station (using data side) as data.
At present, the broadcast wheel inquiry mode that the signalling methods in CC-Link adopts. It realizes process and shown in reference drawing 1, can be specially: first refreshing data (RY/RWw, position output/word exports) by main website and be sent to all from station, meanwhile, wheel askes No. 1 from station; Response (RX/RWr, position input/word inputs) is made for No. 1 from the inquiry of the wheel to main website of standing; Then main website wheel askes No. 2 from station (now do not send and refresh data), provides response from station 2; Analogize with this, move in circles. It should be noted that, when polled from station, main website is provided response time, what other was not polled can receive the polled response provided from station from station, but will directly abandon.
When present inventor analytically states signalling methods, find that sending data to data application receives data from data source from station from station, owing to needs main website forwards, therefore exist in the middle of this and postpone, and time serious, there is the time lag that a nearly wheel askes the refreshing cycle.
Summary of the invention
In view of this, the present invention provides a kind of CC-Link medium-long range IO station and obtains other method from station data and remote IO station. Remote IO station can be improved obtain from station as data source from other of station from the real-time of data at station as market demand.
The method that CC-Link medium-long range IO provided by the invention stands and obtains other from station data, comprising:
Remote IO station intercepts the poll response that target slave returns to main website;
Described remote IO station directly returns to from the target slave listened to the poll response of main website and catches desired data.
Further, described remote IO station intercepts the poll response that target slave returns to main website, comprising:
When the value of the A1 field in the first communication message that remote IO station receives, A2 field is respectively the station of FFH and target slave, preset message is intercepted counter and is set to the first preset value by described remote IO station;
When to intercept counter be the first preset value to described message, if when the A1 field in the 2nd communication message that receives of described remote IO station and A2 field are respectively station number and the FEH of target slave, message is intercepted counter and is set to the 2nd preset value by described remote IO station;
Described remote IO station directly returns to from the target slave listened to the poll response of main website and catches desired data, comprising:
When to intercept counter be the 2nd preset value to described message, described remote IO station directly catches desired data from described the 2nd communication message received;
Wherein, A1 represents that transmitter station address, A2 represent receiving station address.
Further, described remote IO station directly returns to from the target slave listened to the poll response of main website and catches desired data, comprising:
The poll response that the target slave received is returned to main website by described remote IO station is deposited to default data capture storage zone, and the storage zone that communicates with CC-Link, described data capture storage zone is separate;
Described remote IO station extracts desired data from the poll response that described data capture storage zone stores.
Further, before described remote IO station extracts desired data from the poll response that described data capture storage zone stores, described remote IO station checks the validity of the poll response that described data capture storage zone stores;
When the poll response that described remote IO station checks described data capture storage zone to store is effective, perform the step that described remote IO station extracts desired data from the poll response that described data capture storage zone stores.
Further, the effective condition of poll response that described data capture storage zone stores comprises: described poll response do not have WDT mistake, circle transmission mark effectively, to receive refresh flags be receive to terminate, do not have the CRC verification that is normal and described poll response of module mistake mistake, transmission state correct.
Remote IO station in CC-Link provided by the invention, for obtaining fast in same CC-Link system, other, from the data at station, comprising:
Intercept module, return to the poll response of main website for intercepting target slave;
Catch module, for directly intercepting the target slave that module listens to and return to the poll response of main website from described and catch desired data.
Further, described in intercept module, comprising:
First processing unit, for when the value of the A1 field in the first communication message received, A2 field is respectively the station of FFH and target slave, intercepting counter by preset message and be set to the first preset value;
2nd processing unit, for when to intercept counter be the first preset value to described message, if when the A1 field in the 2nd communication message received and A2 field are respectively station number and the FEH of target slave, message being intercepted counter and is set to the 2nd preset value;
Described catch module, for when to intercept counter be the 2nd preset value to described message, directly catching desired data from described the 2nd communication message received;
Wherein, A1 represents that transmitter station address, A2 represent receiving station address.
Further, catch module described in comprise:
Storage unit, deposits to default data capture storage zone for the target slave received returns to the poll response of main website, and the storage zone that communicates with CC-Link, described data capture storage zone is separate;
Extraction unit, extracts desired data in the poll response that stores from described data capture storage zone.
Further, described in catch module, also comprise:
Verification unit, for checking the validity of poll response that described data capture storage zone stores;
Described extraction unit, for when the poll response that described verification unit checks described data capture storage zone to store is effective, extracting desired data from the poll response that described data capture storage zone stores.
Further, the effective condition of poll response that described data capture storage zone stores comprises: described poll response do not have WDT mistake, circle transmission mark effectively, to receive refresh flags be receive to terminate, do not have the CRC verification that is normal and described poll response of module mistake mistake, transmission state correct.
The useful effect of the present invention:
Desired data is caught owing to remote IO station directly returns to from target slave the poll response of main website, there is not main website in the middle of this and forward this link, therefore can improve remote IO station and obtain in same CC-Link other speed from station data, namely improve real-time, reduce communication and postpone.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described:
Fig. 1 is that the wheel in CC-Link askes refreshing sequential chart.
Fig. 2 is the first embodiment that CC-Link medium-long range IO provided by the invention stands and obtains other from the method for station data.
Fig. 3 is the 2nd embodiment that CC-Link medium-long range IO provided by the invention stands and obtains other from the method for station data.
Fig. 4 is the 3rd embodiment that CC-Link medium-long range IO provided by the invention stands and obtains other from the method for station data.
Fig. 5 is the structural representation of data storage zone provided by the invention.
Fig. 6 is the 4th embodiment that CC-Link medium-long range IO provided by the invention stands and obtains other from the method for station data.
Fig. 7 is the structural representation of the embodiment that CC-Link medium-long range IO provided by the invention stands.
Embodiment
In following embodiment, remote IO station in CC-Link as market demand from station, intelligent device station in CC-Link, remote device station and local station as data source from station (i.e. " target slave "), owing to remote IO station only can carry out the I/O of " bit-type " data, therefore following embodiment does not relate to the transmission of " font " data, and these remote device stations, remote IO station, intelligent device station and the design of local station are in the same network segment.
Please refer to Fig. 2, it is the schematic flow sheet that CC-Link medium-long range IO provided by the invention stands and obtains other from the first embodiment of the method for station data. Comprising:
Step S21, remote IO station intercept the poll response that target slave returns to main website.
Step S22, remote IO station directly return to from the target slave listened to the poll response of main website and catch desired data.
In the present embodiment, desired data is caught owing to remote IO station directly returns to from target slave the poll response of main website, there is not main website in the middle of this and forward this link, therefore can improve remote IO station and obtain in same CC-Link other speed from station data, namely improve real-time, reduce communication and postpone.
Please refer to Fig. 3, it is the schematic flow sheet that CC-Link medium-long range IO provided by the invention stands and obtains other from the 2nd embodiment of the method for station data. Comprising:
When A1 field in the first communication message that step S31, remote IO station receive, the value of A2 field are respectively the station of FFH and target slave, preset message are intercepted counter and is set to the first preset value.
Step S32, when to intercept counter be the first preset value to message, if when the A1 field in the 2nd communication message that receives of remote IO station and A2 field are respectively station number and the FEH of target slave, message is intercepted counter and is set to the 2nd preset value by remote IO station.
Step S33, when to intercept counter be the 2nd preset value to message, remote IO station directly catches desired data from the 2nd communication message received.
In CC-Link, the basic form of transmission frame (that is: communication message) is as shown in Table 1.
Table one:
| F | F | F | A1 | A2 | ST1 | ST2 | DATA | F | F | F |
Wherein, F: prefix tag field, A1: transmitter station address, A2: receiving station address, ST1: status information 1, ST2: status information 2, DATA:RX/RY, RW (circulation) and transient data, CRC: mistake verification (16). Work as A1:FFH, A2: during the station of target slave, show that this communication message is that the wheel that main website is handed down to target slave askes message. Work as A1: the station number of target slave, during A2:FEH, represent that this communication message is the poll response that target slave returns to main website.
Preferably, the first preset value is the 1, two preset value is 2. Like this, when the A1 field in the 2nd communication message that remote IO station receives and A2 field are respectively station number and the FEH of target slave, only need that message is intercepted counter and add up, easy realization very.
In the present embodiment, when the value that remote IO station detects out A1 field and A2 field first in the communication message received is respectively " FFH " and " station number of target slave ", the value that message is intercepted counter is set to 1. When remote IO station is when receiving the value detecting out A1 field and A2 field in communication message and be respectively " station number of target slave " and " FEH ", if now message intercepts counter has been 1, then this message is intercepted counter and add 1. When the value that message intercepts counter is 2, remote IO station directly catches desired data from the communication message received.
In the present embodiment, utilize the characteristic that from station, main website is carried out Gap response, intercept counter by a message and the message listened to is screened, determine whether that target slave returns to the poll response of main website. And above-mentioned three steps are well together in series by the value being intercepted counter by message, are extremely beneficial to realization.
Please refer to Fig. 4, it is the schematic flow sheet that CC-Link medium-long range IO provided by the invention stands and obtains other from the 3rd embodiment of the method for station data. Comprising:
Step S41, remote IO station intercept the poll response that target slave returns to main website.
The poll response that the target slave received is returned to main website by step S42, remote IO station is deposited to default data capture storage zone.
Step S43, remote IO station check data catch the validity of the poll response that storage zone stores.
Step S44, when the assay of step S43 is effective, from data capture storage zone store poll response extract desired data.
Wherein, the structure of the data capture storage zone in step S42 communicates with CC-Link the similar of storage zone, but separate, to avoid the method for the present embodiment that existing CC-Link communication is caused interference. Concrete, the structure of the storage zone of the present embodiment can as shown in Figure 5, the data capture storage zone that storage zone and the present embodiment propose comprising: existing CC-Link communicates.
Wherein, step S43 determines the effective condition of poll response and is: poll response does not have WDT mistake, circle transmission mark effectively, to receive refresh flags be receive to terminate, do not have the CRC verification that is normal and poll response of module mistake mistake, transmission state correct. Concrete, can be judged by the value of corresponding positions in the ST1 field in poll response for WDT mistake, module mistake mistake, circle transmission mark, reception refresh flags. Transmission state can be judged by the value of ST2 field corresponding positions in poll response. When determine poll response does not have WDT mistake, circle transmission mark effectively, receive refresh flags be reception terminate, do not have module mistake mistake and transmission state normal time, poll response is carried out CRC (CyclicRedundancyCheck, CRC) verification, if verification is correct, then it is judged as effectively.
The present embodiment, by the poll response caught being dumped to the data capture storage zone newly opened up, the method avoiding the present embodiment communicate with existing CC-Link between interference. Poll response is carried out validity verification, it is possible to ensure to obtain data accurately.
Please refer to Fig. 6, it is the schematic flow sheet that CC-Link medium-long range IO provided by the invention stands and obtains other from the 4th embodiment of the method for station data.
In the present embodiment, at system design stage, station i (for remote IO station) just can be specified will stand j (in same CC-Link other from station) as target slave, and the pre-defined i that stands specifically will which or which data of direct acquisition station j. Like this, stand i outside the communication completing between self and main website, by real-time sense other respectively from station and main website between communication message, the message as listened to be unrelated from station and main website between communication message, will not deal with and directly abandon; When intercept arrive at a station communicate between j with main website time, directly return the communication message of main website from station j, capture required data fast.
Concrete, Fig. 6 embodiment comprises:
After step S601, the i that stands receive communication message, judge that whether the A1 in communication message be whether FFH, A2 is the station number of station j. If performing step S602, otherwise communicating according to the CC-Link of standard.
It is 1 that step S602, initialize message intercept the value of counter.
Step S603, when the value intercepting counter is 1, after the communication message that the i that stands receives, judging that whether A1 is the station number of station j, whether A2 is FEH. If performing step S604, otherwise continue to judge.
Step S604, message is intercepted counter add 1.
Step S605, when the value that message intercepts counter is 2, the communication message received is deposited to data capture storage zone.
Step S606, message are intercepted counter and are set to 0, and prepare for intercepting next time.
Whether step S607, inspection have module mistake mistake. If performing step S608, otherwise perform step S14.
Step S608, refreshing receive whether mark is that reception terminates. If performing step S609, otherwise perform step S14
Whether step S609, circle transmission mark be effective. If performing step S610, otherwise row step S14
Step S610, whether there is no WDT mistake. If performing step S611, otherwise perform step S14
Whether step S611, transmission route state be normal. If performing step S612, otherwise perform step S
Whether step S612, CRC verification is correct. If performing step S613, otherwise perform step S14
Step S613, the data extracting needs, it is provided that to application program, return normal communication process, to terminate this flow process.
Step S614, dropping packets and data, terminate this flow process.
Under the structure of the remote IO station in CC-Link provided by the invention is described.
Please refer to Fig. 7, it is the structural representation of the embodiment of the remote IO station in CC-Link provided by the invention. Comprising:
Intercept module 1, return to the poll response of main website for intercepting target slave.
Catch module 2, for directly catching desired data from the poll response intercepting the target slave that module 1 listens to and returning to main website.
In the present embodiment, desired data is caught owing to remote IO station directly returns to from target slave the poll response of main website, there is not main website in the middle of this and forward this link, therefore can improve remote IO station and obtain in same CC-Link other speed from station data, namely improve real-time, reduce communication and postpone.
Please continue to refer to Fig. 7, intercepting module 1 can comprise:
First processing unit 11, for when the value of the A1 field in the first communication message received, A2 field is respectively the station of FFH and target slave, intercepting counter by preset message and be set to the first preset value. , work as A1:FFH herein, A2: during the station of target slave, show that this communication message is that the wheel that main website is handed down to target slave askes message
2nd processing unit 12, for when to intercept counter be the first preset value to message, if when the A1 field in the 2nd communication message received and A2 field are respectively station number and the FEH of target slave, message being intercepted counter and is set to the 2nd preset value. Herein, A1: the station number of target slave, during A2:FEH, represents that this communication message is the poll response that target slave returns to main website
Catch module 2, for when to intercept counter be the 2nd preset value to message, directly catching desired data from the 2nd communication message received.
Preferably, the first preset value is the 1, two preset value is 2. Like this, when the A1 field in the 2nd communication message that the 2nd processing unit 12 receives and A2 field are respectively station number and the FEH of target slave, only need that message is intercepted counter and add up, easy realization very.
In the present embodiment, utilize the characteristic that from station, main website is carried out Gap response, intercept counter by a message and the message listened to is screened, determine whether that target slave returns to the poll response of main website. And above-mentioned three processes are well together in series by the value being intercepted counter by message, are extremely beneficial to realization.
With continued reference to Fig. 7, catching module 2 can comprise:
Storage unit 21, for depositing the poll response intercepting the target slave that module 1 listens to and returning to main website to default data capture storage zone.
Verification unit 22, for poll response being deposited to data capture storage zone when storage unit 21, check data catches the validity of the poll response that storage zone stores.
Extraction unit 23, for when the assay of verification unit 22 is effective, extracting desired data from the poll response that data capture storage zone stores.
Wherein, the structure of data capture storage zone communicates with CC-Link the similar of storage zone, but separate, to avoid the method for the present embodiment that existing CC-Link communication is caused interference. Concrete, the structure of the storage zone of the present embodiment can shown in Fig. 5, the data capture storage zone that storage zone and the present embodiment propose comprising: existing CC-Link communicates.
Wherein, verification unit 22 inspection to the effective condition of poll response is: poll response does not have WDT mistake, circle transmission mark effectively, receive refresh flags be receive terminate, there is no that module mistake mistake, transmission state be normal and the CRC verification of poll response correctly. Concrete, can be judged by the value of corresponding positions in the ST1 field in poll response for WDT mistake, module mistake mistake, circle transmission mark, reception refresh flags. Transmission state can be judged by the value of ST2 field corresponding positions in poll response. When determine poll response does not have WDT mistake, circle transmission mark effectively, receive refresh flags be reception terminate, do not have module mistake mistake and transmission state normal time, poll response is carried out CRC (CyclicRedundancyCheck, CRC) verification, if verification is correct, then it is judged as effectively.
The present embodiment, by the poll response caught being dumped to the data capture storage zone newly opened up, the method avoiding the present embodiment communicate with existing CC-Link between interference. Poll response is carried out validity verification, it is possible to ensure to obtain data accurately.
What finally illustrate is, above embodiment is only in order to illustrate the technical scheme of the present invention and unrestricted, although with reference to better embodiment to invention has been detailed explanation, it will be understood by those within the art that, the technical scheme of the present invention can be modified or equivalent replacement, and not departing from objective and the scope of technical solution of the present invention, it all should be encompassed in the middle of the right of the present invention.
Claims (8)
1. the method that a CC-Link medium-long range IO stands and obtains other from station data, it is characterised in that: comprising:
Remote IO station intercepts the poll response that target slave returns to main website;
Described remote IO station directly returns to from the target slave listened to the poll response of main website and catches desired data;
Described remote IO station intercepts the poll response that target slave returns to main website, comprising:
When the value of the A1 field in the first communication message that remote IO station receives, A2 field is respectively the station of FFH and target slave, preset message is intercepted counter and is set to the first preset value by described remote IO station;
When to intercept counter be the first preset value to described message, if when the A1 field in the 2nd communication message that receives of described remote IO station and A2 field are respectively station number and the FEH of target slave, message is intercepted counter and is set to the 2nd preset value by described remote IO station;
Described remote IO station directly returns to from the target slave listened to the poll response of main website and catches desired data, comprising:
When to intercept counter be the 2nd preset value to described message, described remote IO station directly catches desired data from described the 2nd communication message received;
Wherein, A1 represents that transmitter station address, A2 represent receiving station address.
2. the method for claim 1, it is characterised in that: described remote IO station directly returns to from the target slave listened to the poll response of main website and catches desired data, comprising:
The poll response that the target slave received is returned to main website by described remote IO station is deposited to default data capture storage zone, and the storage zone that communicates with CC-Link, described data capture storage zone is separate;
Described remote IO station extracts desired data from the poll response that described data capture storage zone stores.
3. method as claimed in claim 2, it is characterized in that: before described remote IO station extracts desired data from the poll response that described data capture storage zone stores, described remote IO station checks the validity of the poll response that described data capture storage zone stores;
When the poll response that described remote IO station checks described data capture storage zone to store is effective, perform the step that described remote IO station extracts desired data from the poll response that described data capture storage zone stores.
4. method as claimed in claim 3, it is characterised in that: the effective condition of poll response that described data capture storage zone stores comprises: described poll response do not have WDT mistake, circle transmission mark effectively, to receive refresh flags be receive to terminate, do not have the CRC verification that is normal and described poll response of module mistake mistake, transmission state correct.
5. the remote IO station in CC-Link, for obtaining in same CC-Link system other data from station fast, it is characterised in that: comprising:
Intercept module, return to the poll response of main website for intercepting target slave;
Catch module, for directly intercepting the target slave that module listens to and return to the poll response of main website from described and catch desired data;
Described intercept module, comprising:
First processing unit, for when the value of the A1 field in the first communication message received, A2 field is respectively the station of FFH and target slave, intercepting counter by preset message and be set to the first preset value;
2nd processing unit, for when to intercept counter be the first preset value to described message, if when the A1 field in the 2nd communication message received and A2 field are respectively station number and the FEH of target slave, message being intercepted counter and is set to the 2nd preset value;
Described catch module, for when to intercept counter be the 2nd preset value to described message, directly catching desired data from described the 2nd communication message received;
Wherein, A1 represents that transmitter station address, A2 represent receiving station address.
6. remote IO station as claimed in claim 5, it is characterised in that: described in catch module and comprise:
Storage unit, deposits to default data capture storage zone for the target slave received returns to the poll response of main website, and the storage zone that communicates with CC-Link, described data capture storage zone is separate;
Extraction unit, extracts desired data in the poll response that stores from described data capture storage zone.
7. remote IO station as claimed in claim 6, it is characterised in that: described in catch module, also comprise:
Verification unit, for checking the validity of poll response that described data capture storage zone stores;
Described extraction unit, for when the poll response that described verification unit checks described data capture storage zone to store is effective, extracting desired data from the poll response that described data capture storage zone stores.
8. remote IO station as claimed in claim 7, it is characterised in that: the effective condition of poll response that described data capture storage zone stores comprises: described poll response do not have WDT mistake, circle transmission mark effectively, to receive refresh flags be receive to terminate, do not have the CRC verification that is normal and described poll response of module mistake mistake, transmission state correct.
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| CN201310155906.6A CN103297308B (en) | 2013-04-28 | 2013-04-28 | CC-Link remote IO station catches method and the equipment of data |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102857956A (en) * | 2012-07-26 | 2013-01-02 | 京信通信系统（广州）有限公司 | Master-slave communication method and device |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102857956A (en) * | 2012-07-26 | 2013-01-02 | 京信通信系统（广州）有限公司 | Master-slave communication method and device |
Non-Patent Citations (2)
| Title |
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| 侦听模式在数据采集中的应用;陈青;《冶金自动化2007年增刊》;20070930;第126-128页 * |
| 基于ARM的CC-Link多功能控制器的开发与应用;陈登;《中国优秀硕士学位论文全文库信息科技辑》;20111215;I140-281 * |
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