CN103297308A - Method and device for data capture of CC-Link remote IO station - Google Patents
Method and device for data capture of CC-Link remote IO station Download PDFInfo
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- CN103297308A CN103297308A CN2013101559066A CN201310155906A CN103297308A CN 103297308 A CN103297308 A CN 103297308A CN 2013101559066 A CN2013101559066 A CN 2013101559066A CN 201310155906 A CN201310155906 A CN 201310155906A CN 103297308 A CN103297308 A CN 103297308A
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Abstract
The invention provides a method for a remote IO station in CC-Link to acquire data of other slave stations and the remote IO station. The method comprises the steps that the remote IO station monitors poll response returned to a master station by target slave stations, and the remote IO station directly captures needed data from the poll response returned to the master station by the target slave stations. The remote IO station comprises a monitoring module and a capture module. According to the method for the data capture of the CC-Link remote IO station and the remote IO station, due to the fact that the remote IO station directly captures the needed data from the poll response returned to the master station by the target slave stations, the link of transmission of the main station does not exist in the process, and therefore the speed of the remote IO station capturing data of other slave stations in the same CC-Link can be improved.
Description
Technical field
The present invention relates to automation control area, relate in particular to the method and apparatus that data are caught at a kind of CC-Link remote I station, specifically refer to method and remote I station that a kind of CC-Link medium-long range IO station obtains its other slave station data.
Background technology
CC-Link(Control﹠amp; Communication Link, control and communication link system) as a kind of field bus technique of opening, mainly lay particular emphasis on the fieldbus numeral communication technology of control network in the automation control system, its station that relates to comprises: main website and slave station, wherein slave station comprises again: remote I (Input/output, input and output) stand, the remote equipment station, smart machine and local station, wherein the I/O of " bit-type " data can be carried out in the remote I station, the I/O of " bit-type " data is not only carried out at the remote equipment station, can also carry out the I/O of " font " data, the smart machine station has instantaneous transfer function, local station is actual to be a standby main website, and these slave stations both can be used as data source slave station (data side is provided) and had used, and also can be used as data and should do slave station (using data side) use.
At present, the broadcasting polling mode of the employing of the communication mode among the CC-Link.Its implementation procedure can be specially with reference to shown in Figure 1: at first by main website refresh data (RY/RWw, position output/word output) is sent to all slave stations, meanwhile, No. 1 slave station of poll; No. 1 slave station is made response (RX/RWr, position input/word input) to the poll of main website; No. 2 slave stations of main website poll (this moment do not send refresh data) then, slave station 2 provides response; By that analogy, move in circles.Need to prove that when polled slave station provided response to main website, other not polled slave station can be received the response that polled slave station provides, but will directly abandon.
The present inventor is when analyzing above-mentioned communication mode, discovery is sent data to data application slave station from the data source slave station and is received data, owing to need main website to transmit, so exist in the middle of this and postpone, and have the time delay of a nearly poll refresh cycle when serious.
Summary of the invention
In view of this, the invention provides method and the remote I station that a kind of CC-Link medium-long range IO station obtains other slave station data.Can improve the remote I station uses slave station as data and obtains real-time as the data of other slave station of data source slave station.
CC-Link medium-long range IO provided by the invention station obtains the method for other slave station data, comprising:
The poll response that the target slave station returns to main website is intercepted at the remote I station;
Described remote I is stood erectly to connect from the target slave station that listens to returns to the poll response of main website and is caught desired data.
Further, the poll response that the target slave station returns to main website is intercepted at described remote I station, comprising:
When the value of the A1 field in first communication message that the remote I station receives, A2 field was respectively the station number of FFH and target slave station, described remote I station was intercepted counter with the message that presets and is set to first preset value;
When described message is intercepted counter when being first preset value, if when the station number that the A1 field in the second communication message that described remote I station receives and A2 field are respectively the target slave station and FEH, described remote I station is intercepted counter with message and is set to second preset value;
Described remote I is stood erectly to connect from the target slave station that listens to returns to the poll response of main website and is caught desired data, comprising:
Intercept counter when being second preset value when described message, described remote I is stood erectly to connect from the described second communication message that receives and is caught desired data;
Wherein, A1 represents that transmitter station address, A2 represent the destination address.
Further, described remote I is stood erectly to connect from the target slave station that listens to returns to the poll response of main website and is caught desired data, comprising:
The poll response that described remote I station returns to main website with the target slave station that receives is deposited to default data capture memory block, and the memory block of communicating by letter with CC-Link, described data capture memory block is separate;
Desired data is extracted in described remote I station from the poll response of described data capture storage area stores.
Further, desired data was extracted in described remote I station from the poll response of described data capture storage area stores before, the validity of the poll response of described data capture storage area stores was checked at described remote I station;
When described remote I station checks the poll response of described data capture storage area stores effective, carry out desired data is extracted at described remote I station from the poll response of described data capture storage area stores step.
Further, the effective condition of the poll response of described data capture storage area stores comprises: described poll response do not have WDT mistake, circle transmission sign effectively, receive refresh be masked as receive finish, do not have module mistake mistake, transmission state is normal and CRC check described poll response is correct.
Remote I station among the CC-Link provided by the invention is used for obtaining fast the data of other slave station of same CC-Link system, comprising:
Intercept module, be used for intercepting the poll response that the target slave station returns to main website;
Trapping module is used for directly intercepting the poll response that target slave station that module listens to returns to main website and catching desired data from described.
Further, the described module of intercepting comprises:
First processing unit when value that is used for A1 field, A2 field when first communication message that receives is respectively the station number of FFH and target slave station, is intercepted counter with the message that presets and is set to first preset value;
Second processing unit is used for intercepting counter when being first preset value when described message, when the station number that is respectively the target slave station as if the A1 field in the second communication message that receives and A2 field and FEH, message is intercepted counter be set to second preset value;
Described trapping module is used for intercepting counter when being second preset value when described message, directly catches desired data from the described second communication message that receives;
Wherein, A1 represents that transmitter station address, A2 represent the destination address.
Further, described trapping module comprises:
Memory cell, the poll response that is used for the target slave station that receives is returned to main website is deposited to default data capture memory block, and the memory block of communicating by letter with CC-Link, described data capture memory block is separate;
Extraction unit is used for extracting desired data from the poll response of described data capture storage area stores.
Further, described trapping module also comprises:
Verification unit is for the validity of the poll response of checking described data capture storage area stores;
Described extraction unit when effective for the poll response of checking described data capture storage area stores when described verification unit, extracts desired data from the poll response of described data capture storage area stores.
Further, the effective condition of the poll response of described data capture storage area stores comprises: described poll response do not have WDT mistake, circle transmission sign effectively, receive refresh be masked as receive finish, do not have module mistake mistake, transmission state is normal and CRC check described poll response is correct.
Beneficial effect of the present invention:
Because standing erectly to connect from the target slave station returns to the poll response of main website, remote I catches desired data, do not exist main website to transmit this link in the middle of this, therefore can improve the speed that the remote I station obtains other slave station data among the same CC-Link, namely improve real-time, reduce communication delay.
Description of drawings
Below in conjunction with drawings and Examples the present invention is further described:
Fig. 1 is that the poll among the CC-Link refreshes sequential chart.
Fig. 2 is first embodiment that CC-Link medium-long range IO provided by the invention station obtains the method for other slave station data.
Fig. 3 is second embodiment that CC-Link medium-long range IO provided by the invention station obtains the method for other slave station data.
Fig. 4 is the 3rd embodiment that CC-Link medium-long range IO provided by the invention station obtains the method for other slave station data.
Fig. 5 is the structural representation of data storage area provided by the invention.
Fig. 6 is the 4th embodiment that CC-Link medium-long range IO provided by the invention station obtains the method for other slave station data.
Fig. 7 is the structural representation of the embodiment at CC-Link medium-long range IO provided by the invention station.
Embodiment
Among the following embodiment, slave station is used as data in remote I station among the CC-Link, smart machine station among the CC-Link, remote equipment station and local station are as data source slave station (i.e. " target slave station "), because the I/O of " bit-type " data only can be carried out in the remote I station, therefore following embodiment does not relate to the transmission of " font " data, and these remote equipment stations, remote I station, smart machine station and local station design are in the same network segment.
Please refer to Fig. 2, is the schematic flow sheet of first embodiment of the CC-Link medium-long range IO provided by the invention station method of obtaining other slave station data.It comprises:
The poll response that the target slave station returns to main website is intercepted at step S11, remote I station.
Step S12, remote I are stood erectly to connect from the target slave station that listens to returns to the poll response of main website and are caught desired data.
In the present embodiment, because standing erectly to connect from the target slave station returns to the poll response of main website, remote I catches desired data, do not exist main website to transmit this link in the middle of this, therefore can improve the speed that the remote I station obtains other slave station data among the same CC-Link, namely improve real-time, reduce communication delay.
Please refer to Fig. 3, is the schematic flow sheet of second embodiment of the CC-Link medium-long range IO provided by the invention station method of obtaining other slave station data.It comprises:
A1 field in first communication message that step S21, remote I station receive, when the value of A2 field is respectively the station number of FFH and target slave station, the message that presets is intercepted counter be set to first preset value.
Step S22, intercept counter when being first preset value when message, if when the station number that the A1 field in the second communication message that the remote I station receives and A2 field are respectively the target slave station and FEH, the remote I station is intercepted counter with message and is set to second preset value.
Step S23, intercept counter when being second preset value when message, remote I is stood erectly to connect from the second communication message that receives and is caught desired data.
In CC-Link, the basic format of transmission frame (that is: communication message) as shown in Table 1.
Table one:
| F | F | F | A1 | A2 | ST1 | ST2 | DATA | F | F | F |
Wherein, F: preamble attribute field, A1: transmitter station address, A2: destination address, ST1: state information 1, ST2: state information 2, DATA:RX/RY, RW(circulation) and transient data, CRC: error checking and correction (16).Work as A1:FFH, A2: during the station number of target slave station, show that this communication message is the polling message that main website is handed down to the target slave station.Work as A1: the station number of target slave station, during A2:FEH, represent that this communication message is the poll response that the target slave station returns to main website.
Preferably, first preset value is that 1, the second preset value is 2.Like this, when the A1 field in the second communication message that the remote I station receives and A2 field are respectively the station number of target slave station and FEH, only need that message is intercepted counter and add up and get final product easy realization very.
In the present embodiment, when remote I stood in the value that detects A1 field and A2 field in the communication message of receiving first and is respectively " FFH " and " station number of target slave station ", the value of message being intercepted counter was set to 1.Receive the value that detects A1 field and A2 field in the communication message when being respectively " station number of target slave station " and " FEH " when remote I stands in, if this moment message to intercept counter be 1, then this message is intercepted counter and adds 1.When the value of intercepting counter when message was 2, remote I was stood erectly to connect from the communication message that receives and is caught desired data.
In the present embodiment, utilize slave station that main website is carried out the characteristic of response at interval, intercept counter by a message message that listens to is screened, judge whether to return to for the target slave station poll response of main website.And the value of intercepting counter by message well is together in series above-mentioned three steps, very is beneficial to realization.
Please refer to Fig. 4, is the schematic flow sheet of the 3rd embodiment of the CC-Link medium-long range IO provided by the invention station method of obtaining other slave station data.It comprises:
The poll response that the target slave station returns to main website is intercepted at step S41, remote I station.
Step S42, remote I station deposit the poll response that the target slave station that receives returns to main website to default data capture memory block.
Step S43, remote I station check data are caught the validity of the poll response of storage area stores.
Step S44, when the assay of step S43 when being effective, from the poll response of data capture storage area stores, extract desired data.
Wherein, communicate by letter with the CC-Link structure of memory block of the structure of the data capture memory block among the step S42 is similar, but separate, and communication causes interference to existing C C-Link with the method for avoiding present embodiment.Concrete, the structure of the memory block of present embodiment can be as shown in Figure 5, and it comprises: the data capture memory block that existing C C-Link communication memory block and present embodiment propose.
Wherein, step S43 determines the effective condition of poll response and is: do not have in the poll response WDT mistake, circle transmission sign effectively, receive refresh be masked as receive finish, do not have module mistake mistake, transmission state is normal and CRC check poll response is correct.Concrete, refresh sign and can judge by the value of corresponding positions in the ST1 field in the poll response for WDT mistake, module mistake mistake, circle transmission sign, reception.Transmission state can be judged by the value of ST2 field corresponding positions in the poll response.In determining poll response, do not have WDT mistake, circle transmission sign effectively, receive to refresh to be masked as to receive and finish, do not have module mistake mistake and transmission state just often, poll response is carried out CRC(Cyclic Redundancy Check, CRC) verification, if verification is correct, then be judged as effectively.
Present embodiment dumps to the data capture memory block of newly opening up by the poll response of will catch, the method for having avoided present embodiment and interference between existing C C-Link communicates by letter.Poll response is carried out validity check, can guarantee to obtain accurate data.
Please refer to Fig. 6, is the schematic flow sheet of the 4th embodiment of the CC-Link medium-long range IO provided by the invention station method of obtaining other slave station data.
In the present embodiment, at system design stage, just can specify station i(is the remote I station) other slave station among the same CC-Link of j(that will stand) as the target slave station, and pre-defined station i specifically will directly obtain which or which data of the j that stands.Like this, stand i finish self with main website between communicate by letter outside, with the communication message between other each slave station of real-time sense and the main website, as the message that listens to is the communication message between irrelevant slave station and the main website, will not deal with and directly abandon; When intercepting when communicating by letter between arrive at a station j and the main website, directly slave station j returns in the communication message of main website, captures needed data fast.
Concrete, Fig. 6 embodiment comprises:
After step S601, the i that stands receive communication message, judge whether the A1 in the communication message is FFH, whether A2 is the station number of station j.If, execution in step S602, otherwise communicate by letter according to the CC-Link of standard.
The value that step S602, Initial message are intercepted counter is 1.
Step S603, when the value of intercepting counter is 1, behind the communication message that the i that stands receives, judge that whether A1 is the station number of station j, whether A2 is FEH.If, execution in step S604, otherwise continue to judge.
Step S604, message is intercepted counter add 1.
Step S605, when the value of intercepting counter when message is 2, the communication message that receives is deposited to the data capture memory block.
Step S606, message are intercepted counter and are put 0, prepare for intercept next time.
Whether step S607, check have module mistake mistake.If, execution in step S608, otherwise execution in step S14.
Whether step S608, to refresh receiving flag be to receive to finish.If, execution in step S609, otherwise execution in step S14
Whether step S609, circle transmission sign be effective.If, execution in step S610, otherwise row step S14
Step S610, whether there is not the WDT mistake.If, execution in step S611, otherwise execution in step S14
Whether step S611, transmission path state be normal.If, execution in step S612, otherwise execution in step S
Whether step S612, CRC check be correct.If, execution in step S613, otherwise execution in step S14
The data that step S613, extraction need offer application program, return normal communication process, to finish this flow process.
Step S614, dropping packets and data finish this flow process.
Structure to the remote I station among the CC-Link provided by the invention describes down.
Please refer to Fig. 7, is the structural representation of the embodiment at the remote I station among the CC-Link provided by the invention.It comprises:
Intercept module 1, be used for intercepting the poll response that the target slave station returns to main website.
Trapping module 2 is used for directly catching desired data from intercepting the poll response that target slave station that module 1 listens to returns to main website.
In the present embodiment, because standing erectly to connect from the target slave station returns to the poll response of main website, remote I catches desired data, do not exist main website to transmit this link in the middle of this, therefore can improve the speed that the remote I station obtains other slave station data among the same CC-Link, namely improve real-time, reduce communication delay.
Please continue with reference to figure 7, intercepting module 1 can comprise:
First processing unit 11 when the value that is used for A1 field, A2 field when first communication message that receives is respectively the station number of FFH and target slave station, is intercepted counter with the message that presets and is set to first preset value., work as A1:FFH herein, A2: during the station number of target slave station, show that this communication message is the polling message that main website is handed down to the target slave station
Second processing unit 12 is used for intercepting counter when being first preset value when message, when the station number that is respectively the target slave station as if the A1 field in the second communication message that receives and A2 field and FEH, message is intercepted counter be set to second preset value.Herein, A1: the station number of target slave station, during A2:FEH, represent that this communication message is the poll response that the target slave station returns to main website
Trapping module 2 is used for intercepting counter when being second preset value when message, directly catches desired data from the second communication message that receives.
Preferably, first preset value is that 1, the second preset value is 2.Like this, when the A1 field in the second communication message that second processing unit 12 receives and A2 field are respectively the station number of target slave station and FEH, only need that message is intercepted counter and add up and get final product easy realization very.
In the present embodiment, utilize slave station that main website is carried out the characteristic of response at interval, intercept counter by a message message that listens to is screened, judge whether to return to for the target slave station poll response of main website.And the value of intercepting counter by message well is together in series above-mentioned three processes, very is beneficial to realization.
Continuation is with reference to figure 7, and trapping module 2 can comprise:
Memory cell 21 is used for intercepting the poll response that target slave station that module 1 listens to returns to main website and deposits to default data capture memory block.
Verification unit 22 is used for poll response being deposited to the data capture memory block when memory cell 21, and check data is caught the validity of the poll response of storage area stores.
Extraction unit 23 is used for extracting desired data when the assay of verification unit 22 when being effective from the poll response of data capture storage area stores.
Wherein, communicate by letter with the CC-Link structure of memory block of the structure of data capture memory block is similar, but separate, and communication causes interference to existing C C-Link with the method for avoiding present embodiment.Concrete, the structure of the memory block of present embodiment can be shown in Figure 5, and it comprises: the data capture memory block that existing C C-Link communication memory block and present embodiment propose.
Wherein, verification unit 22 check to the effective condition of poll response is: do not have in the poll response WDT mistake, circle transmission sign effectively, receive refresh be masked as receive finish, do not have module mistake mistake, transmission state normally and the CRC check of poll response correct.Concrete, refresh sign and can judge by the value of corresponding positions in the ST1 field in the poll response for WDT mistake, module mistake mistake, circle transmission sign, reception.Transmission state can be judged by the value of ST2 field corresponding positions in the poll response.In determining poll response, do not have WDT mistake, circle transmission sign effectively, receive to refresh to be masked as to receive and finish, do not have module mistake mistake and transmission state just often, poll response is carried out CRC(Cyclic Redundancy Check, CRC) verification, if verification is correct, then be judged as effectively.
Present embodiment dumps to the data capture memory block of newly opening up by the poll response of will catch, the method for having avoided present embodiment and interference between existing C C-Link communicates by letter.Poll response is carried out validity check, can guarantee to obtain accurate data.
Explanation is at last, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although with reference to preferred embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not breaking away from aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (10)
1. a CC-Link medium-long range IO station obtains the method for other slave station data, it is characterized in that: comprising:
The poll response that the target slave station returns to main website is intercepted at the remote I station;
Described remote I is stood erectly to connect from the target slave station that listens to returns to the poll response of main website and is caught desired data.
2. the method for claim 1, it is characterized in that: the poll response that the target slave station returns to main website is intercepted at described remote I station, comprising:
When the value of the A1 field in first communication message that the remote I station receives, A2 field was respectively the station number of FFH and target slave station, described remote I station was intercepted counter with the message that presets and is set to first preset value;
When described message is intercepted counter when being first preset value, if when the station number that the A1 field in the second communication message that described remote I station receives and A2 field are respectively the target slave station and FEH, described remote I station is intercepted counter with message and is set to second preset value;
Described remote I is stood erectly to connect from the target slave station that listens to returns to the poll response of main website and is caught desired data, comprising:
Intercept counter when being second preset value when described message, described remote I is stood erectly to connect from the described second communication message that receives and is caught desired data;
Wherein, A1 represents that transmitter station address, A2 represent the destination address.
3. method as claimed in claim 1 or 2 is characterized in that: described remote I is stood erectly to connect from the target slave station that listens to returns to the poll response of main website and is caught desired data, comprising:
The poll response that described remote I station returns to main website with the target slave station that receives is deposited to default data capture memory block, and the memory block of communicating by letter with CC-Link, described data capture memory block is separate;
Desired data is extracted in described remote I station from the poll response of described data capture storage area stores.
4. method as claimed in claim 3, it is characterized in that: desired data was extracted in described remote I station from the poll response of described data capture storage area stores before, the validity of the poll response of described data capture storage area stores was checked at described remote I station;
When described remote I station checks the poll response of described data capture storage area stores effective, carry out desired data is extracted at described remote I station from the poll response of described data capture storage area stores step.
5. method as claimed in claim 4, it is characterized in that: the effective condition of the poll response of described data capture storage area stores comprises: described poll response do not have WDT mistake, circle transmission sign effectively, receive refresh be masked as receive finish, do not have module mistake mistake, transmission state is normal and CRC check described poll response is correct.
6. the remote I station among the CC-Link is used for obtaining fast the data of other slave station of same CC-Link system, it is characterized in that: comprising:
Intercept module, be used for intercepting the poll response that the target slave station returns to main website;
Trapping module is used for directly intercepting the poll response that target slave station that module listens to returns to main website and catching desired data from described.
7. remote I as claimed in claim 6 station, it is characterized in that: the described module of intercepting comprises:
First processing unit when value that is used for A1 field, A2 field when first communication message that receives is respectively the station number of FFH and target slave station, is intercepted counter with the message that presets and is set to first preset value;
Second processing unit is used for intercepting counter when being first preset value when described message, when the station number that is respectively the target slave station as if the A1 field in the second communication message that receives and A2 field and FEH, message is intercepted counter be set to second preset value;
Described trapping module is used for intercepting counter when being second preset value when described message, directly catches desired data from the described second communication message that receives;
Wherein, A1 represents that transmitter station address, A2 represent the destination address.
8. as claim 6 or 7 described remote I stations, it is characterized in that: described trapping module comprises:
Memory cell, the poll response that is used for the target slave station that receives is returned to main website is deposited to default data capture memory block, and the memory block of communicating by letter with CC-Link, described data capture memory block is separate;
Extraction unit is used for extracting desired data from the poll response of described data capture storage area stores.
9. remote I as claimed in claim 8 station, it is characterized in that: described trapping module also comprises:
Verification unit is for the validity of the poll response of checking described data capture storage area stores;
Described extraction unit when effective for the poll response of checking described data capture storage area stores when described verification unit, extracts desired data from the poll response of described data capture storage area stores.
10. remote I as claimed in claim 9 station, it is characterized in that: the effective condition of the poll response of described data capture storage area stores comprises: described poll response do not have WDT mistake, circle transmission sign effectively, receive refresh be masked as receive finish, do not have module mistake mistake, transmission state is normal and CRC check described poll response is correct.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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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| Application Number | Priority Date | Filing Date | Title |
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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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| CN103297308B CN103297308B (en) | 2016-06-01 |
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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 |
|---|
| 陈登: "基于ARM的CC-Link多功能控制器的开发与应用", 《中国优秀硕士学位论文全文库信息科技辑》, 15 December 2011 (2011-12-15), pages 140 - 281 * |
| 陈青: "侦听模式在数据采集中的应用", 《冶金自动化2007年增刊》, 30 September 2007 (2007-09-30), pages 126 - 128 * |
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