CN103312576B - The method and apparatus of CC-Link/LT remote IO station capture-data - Google Patents
The method and apparatus of CC-Link/LT remote IO station capture-data Download PDFInfo
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Abstract
A kind of CC-Link/LT medium-long range IO station provided by the invention obtains method and the remote IO station of other slave station data.Wherein method: comprising: remote IO station intercepts the Refresh Data response that target slave returns to main website; Remote IO station directly returns to the Refresh Data response of main website from the target slave listened to and catches desired data.Wherein remote IO station mainly comprises and intercepts module and trapping module.Adopt the present invention, catch desired data because remote IO station directly returns to the Refresh Data response of main website from target slave, do not need main website to forward this intermediate link, therefore can reduce delay, improve real-time.
Description
Technical field
The present invention relates to automation control area, particularly relate to a kind of method and apparatus of CC-Link/LT remote IO station capture-data, specifically refer to that CC-Link/LT medium-long range IO station obtains method and the remote IO station of other slave station data.
Background technology
CC-Link(Control & CommunicationLink, control and communication link system) be a kind of can simultaneously high speed processing control and the field network system of information data, efficient, integrated factory and automatic process control system can be provided.CC-Link/LT is based upon on the basis of CC-Link technology, designs for carrying out the application of transducer, actuator or other small-sized I/O (Input/output, I/O) specially, has excellent performance and can reduce wiring greatly.
At present, the bus topolopy of CC-Link/LT as shown in Figure 1, it is formed primarily of a main website and multiple (being less than or equal to 64) slave station, wherein slave station comprises: remote IO station and remote device station, wherein remote IO station only can carry out the I/O of " bit data ", remote device station not only can carry out the I/O of " bit data ", can also carry out the I/O of " digital data ".In CC-Link/LT, adopt BITR(BroadcastPolling+IntervalTimedResponse, broadcast polls add interval time response) communication mode, the feature of this kind of communication mode is, in Refresh Data circulation, by main website to whole slave station broadcast data update, after each slave station receives Refresh Data message, take out the RY(position output that main website is handed down to oneself independently) data, then between slave station according to station number order from small to large, successively main website being responded, respective RX(position is inputted) data upload is to main website.According to above-mentioned data refresh procedure, in current CC-Link/LT, the process that remote IO station obtains other slave station data is: in the current poll refresh cycle, by other from stand in make communication response to main website time, main website is sent to by needing the data sending to remote IO station, then, in next poll refresh cycle, by main website when initiating Refresh Data broadcast communication to whole slave station, remote IO station is handed down in the mode of Refresh Data.This kind of mode Problems existing is, sends data and receives this middle delay that there is a poll refresh cycle nearly of these data to remote IO station, thus when causing remote IO station to obtain other slave station data, there is the problem that real-time is low from other slave station.
Summary of the invention
In view of this, the invention provides method and remote IO station that a kind of CC-Link/LT medium-long range IO station obtains other slave station data.When can overcome prior art medium-long range IO station other slave station data of acquisition, the problem that real-time is low due to existence larger delay.
CC-Link/LT medium-long range IO provided by the invention stands and obtains the method for other slave station data, comprising: remote IO station intercepts the Refresh Data response that target slave returns to main website; Remote IO station directly returns to the Refresh Data response of main website from the target slave listened to and catches desired data.
Further, remote IO station intercepts the Refresh Data response that target slave returns to main website, comprise: when remote IO station receives the Refresh Data message of main website broadcast, initialization is intercepted counter and is started slot timer, and when the timing of slot timer arrives, add up to intercepting counter; Judge that the data that current time slots listens to rustle and whether should derive from target slave according to the station number of the value and target slave of intercepting counter; When judged result is for being, performs and returning to the step of catching desired data the Refresh Data response of main website from the target slave listened to.
Further, when remote IO station receives the Refresh Data message of main website broadcast, the value that counter is intercepted in initialization is 1; When the station number of the value with target slave of intercepting counter is equal, judge that the Refresh Data response that current time slots listens to derives from target slave.
Further, remote IO station directly returns to the Refresh Data response of main website from the target slave listened to and catches desired data, comprise: the Refresh Data response that the target slave listened to is returned to main website by remote IO station dumps to data capture memory block, and wherein in data capture memory block and CC-Link/LT, existing communication memory block is separate; Desired data is extracted from the Refresh Data response that data capture memory block stores.
Further, from the Refresh Data response that data capture memory block stores, extract desired data, comprising: check data catches the validity of the Refresh Data response that memory block stores; When the Refresh Data response checking data capture memory block to store is effective, from the Refresh Data response that data capture memory block stores, extract desired data.
Further, when the mark of the remote I/O error bit in the state information byte in the Refresh Data response that data capture memory block stores, information transmission of stand position and check digit represent error-free respectively, do not transmit, correctly time, and the CRC check of Refresh Data response that stores of data capture memory block correct time, assert that Refresh Data response that data capture memory block stores is effectively.
Present invention also offers the remote IO station in a kind of CC-Link/LT, for the data of other slave station in the same CC-Link/LT of quick obtaining, it comprises: intercept module, returns to the Refresh Data response of main website for intercepting target slave; Trapping module, returns to for the direct target slave from listening to the Refresh Data response of main website and catches desired data.
Further, intercept module and comprise: processing unit, for when receiving the Refresh Data message of main website broadcast, initialization is intercepted counter and is started slot timer, and when the timing of slot timer arrives, adds up to intercepting counter; According to the station number of the value and target slave of intercepting counter, judging unit, for judging that the data that current time slots listens to rustle and whether should derive from target slave; Indicating member, when the data listened to for determining current time slots when judging unit rustle and should derive from target slave, instruction trapping module directly returns to the Refresh Data response of main website from target slave and catches desired data.
Further, trapping module, comprising: unloading unit, and dump to data capture memory block for the Refresh Data response target slave listened to being returned to main website, the communication memory block wherein in data capture memory block and CC-Link/LT is separate; Capturing unit, extracts desired data during the Refresh Data for storing from data capture memory block responds.
Further, capturing unit, catch the validity of the Refresh Data response that memory block stores specifically for check data, and when the Refresh Data response checking data capture memory block to store is effective, from the Refresh Data response that data capture memory block stores, extract desired data.
Beneficial effect of the present invention:
In the embodiment of the present invention, desired data is caught because remote IO station directly returns to the Refresh Data response of main website from target slave, main website is not needed to forward this intermediate link, therefore remote IO station can the data of other slave station of quick obtaining, solve prior art medium-long range IO and stand and obtain other slave station data delay large, problem that real-time is low late.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described:
Fig. 1 is the network topological diagram of CC-Link/LT.
Fig. 2 is the schematic flow sheet that CC-Link/LT medium-long range IO provided by the invention station obtains the first embodiment of the method for other slave station data.
Fig. 3 is the schematic flow sheet that CC-Link/LT medium-long range IO provided by the invention station obtains the second embodiment of the method for other slave station data.
Fig. 4 is Refresh Data sequential chart in CC-Link/LT.
Fig. 5 is the schematic flow sheet that CC-Link/LT medium-long range IO provided by the invention station obtains the 3rd embodiment of the method for other slave station data.
Fig. 6 is the structural representation of CC-Link/LT communication memory block and data capture memory block.
Fig. 7 is the schematic flow sheet that CC-Link/LT medium-long range IO provided by the invention station obtains the 4th embodiment of the method for other slave station data.
Fig. 8 is the structural representation of the embodiment that CC-Link/LT medium-long range IO provided by the invention stands.
Embodiment
The invention relates to the scheme that remote IO station obtains other slave station data, therefore in following, only relate to the I/O of " bit data ", and do not relate to the I/O of digital data.
Embodiment one:
Please refer to Fig. 2, is the schematic flow sheet that CC-Link/LT medium-long range IO provided by the invention station obtains the first embodiment of the method for other slave station data.The method flow of Fig. 2 comprises:
Step S21, remote IO station intercept the Refresh Data response that target slave returns to main website.
Step S22, remote IO station directly return to the Refresh Data response of main website from the target slave listened to and catch desired data.
Wherein, target slave can be remote IO station, also can be remote device station.
Wherein, specifically the target slave of which slave station as remote IO station can be specified in advance at system design stage.
Wherein, remote IO station completes outside the communication between self and main website, by the communication message between real-time sense other each slave station and main website, the message as listened to is that the Refresh Data between other irrelevant slave station and main website responds, and will not deal with and directly abandon.When listening to the Refresh Data message between target slave and main website of specifying in advance, according to the input data determining required quick obtaining at system design stage in advance, from the Refresh Data response between target slave and main website, the data required for fast Acquisition
Below in conjunction with an example, the present embodiment is described: suppose at system design stage, specify in advance station number be 5 remote IO station (hereinafter referred to as " market demand slave station ") need quick obtaining station number to be data in the remote IO station (hereinafter referred to as " data source slave station ") of 2.So, in Refresh Data circulation, the Refresh Data response other slave station being fed back to main website is intercepted from standing-meeting by market demand, when listening to data source slave station and feeding back to the Refresh Data response of main website, directly from the response of this Refresh Data, catch required data, thus omission main website forwards this link, to reach reduction communication delay, improve the object of real-time communication.
Embodiment two:
In CC-Link/LT, comprise and also can make Refresh Data response to main website as market demand from the remote IO station of journey, therefore the key point of step S21 how to know that the Refresh Data response listened to derives from target slave, and the present embodiment is devoted to address this problem.
Please refer to Fig. 3, is the schematic flow sheet that CC-Link/LT medium-long range IO provided by the invention station obtains the second embodiment of the method for other slave station data.The method flow of Fig. 3 comprises:
Step S31, when receive main website broadcast Refresh Data message time, initialization is intercepted counter and is started slot timer.
Step S32, whenever slot timer timing arrive time, to intercept counter add up.
The station number of value and target slave that step S33, basis intercept counter judges that the data that current time slots listens to rustle and whether should derive from target slave.
Step S34, when judged result is for being, directly from target slave return to main website Refresh Data response catch desired data.
Wherein, as shown in Figure 4, be the time slot map of data refresh procedure in CC-Link/LT.As can be seen from this time slot map, each slave station carries out Gap response to main website, and when baud rate is fixing, the value of each time slot is identical.Therefore can design a slot timer distinguishes each slave station Refresh Data response according to time slot in Fig. 3 embodiment, design one simultaneously and intercept counter for judging whether it is the Refresh Data response that the target slave that will catch returns to main website.
Concrete, the value intercepting counter being initialized as 1, when the timing of slot timer arrives 1 time, adding 1 to intercepting counter.So when in a certain time slot, intercept the value of counter equal with the station number of target slave time, then show that the Refresh Data response that current time slots listens to derives from target slave.
Embodiment three:
Directly returning to from target slave in step S22 catches in this process of desired data the Refresh Data response of main website, and may clash with the existing communication of remote IO station, therefore the present embodiment proposes following method to be devoted to address this problem.
Please refer to Fig. 5, is the schematic flow sheet that CC-Link/LT medium-long range IO provided by the invention station obtains the 3rd embodiment of the method for other slave station data.The method flow of Fig. 5 comprises:
Step S41, remote IO station intercept the Refresh Data response that target slave returns to main website.
The Refresh Data response that the target slave listened to is returned to main website by step S42, remote IO station dumps to data capture memory block.
Wherein, the similar of the communication memory block in the structure of data capture memory block and current CC-Link/LT, specifically can with reference to shown in figure 6.But data capture memory block is separate with the memory block that communicates, and is independent of each other.The order of data capture memory block is set up separately to avoid the data space with this station proper communication to clash with regard to being.
Step S43, from data capture memory block store Refresh Data response extract desired data.
Wherein, before extraction desired data, check data is needed to catch the validity of the Refresh Data response that memory block stores; Only have to work as Refresh Data response that inspection stores to data capture memory block effective time, just from the Refresh Data response that data capture memory block stores, extract desired data, be supplied to application program and use.Wherein, when only having that condition meets simultaneously below, just think that Refresh Data response effectively, these conditions are: the mark of the remote I/O error bit in the state information byte in Refresh Data response, information transmission of standing position, check digit represents error-free respectively, do not transmit, correctly, and the CRC check of carrying out data refresh response is correct, wherein i.e. " CyclicRedundancyCheck, CRC " CRC, is a kind of error checking and correction mode the most frequently used in data communication field.
Embodiment four:
The present embodiment stands to CC-Link/LT medium-long range IO to obtain the detailed description of method of other slave station data, and this embodiment comprises and realizes many details of the present invention, although many details those skilled in the art are fully aware of.Meanwhile, the present embodiment also add the functions such as such as listening functions ON/OFF.
Please refer to Fig. 7, is the schematic flow sheet that CC-Link/LT medium-long range IO provided by the invention station obtains the 4th embodiment of the method for other slave station data.It comprises:
After step S701, the i that stands receive message, judge whether the A1 in message equals 5E, 6E or 7E.If so, then perform step S702, otherwise perform step S707.
Wherein, i is less than or equal to the positive integer of 64, and namely the i that stands is the remote IO station as market demand slave station in the embodiment of the present invention.In CC-Link/LT, the basic format of the transmission frame of the transmission data of main website as shown in Table 1:
Table one
| F | A1 | A2 | DATA | CRC | F |
Wherein A1 represents transmitter station address information.When 4 dot pattern, as A1=5E, represent that this message is the Refresh Data message of main website broadcast.When 8 dot pattern, as A1=6E, represent that this message is the Refresh Data message of main website broadcast.When 16 dot pattern, as A1=7E, represent that this message is the Refresh Data message of main website broadcast.
Step S702, startup message listening functions.
Step S703, initialization are intercepted counter and start slot timer.Preferably, counter is intercepted in initialization is 1.Wherein the timed length of slot timer is a slot length in the circulation of this Refresh Data.
S704, judge that current time slots replys main website the need of our station.If the determination result is YES, step S705 is performed.Otherwise, perform step S707.
Step S705, to main website return data refresh response, perform step S706.
Step S706, judge whether the message listening functions of our station closes.If close, perform step S707, otherwise perform step S708.
Step S707, to communicate according to the CC-Link/LT pattern of standard, process ends.
Step S708, judge whether slot timer arrives.If arrived, then perform step S709, otherwise continue to judge.
Step S709, intercept counter and add 1.
Step S710, judge whether needed for the Refresh Data response that returns to main website of the target slave intercepted.If so, perform step S711, otherwise perform step S704.Wherein, when the value of the station number of the value with target slave of intercepting counter is equal, judged result is yes.
Step S711, stopping message listening functions.
Step S712, Initial message intercept counter=1.This step can be omitted, and mainly prepares to intercept next time herein.
Step S713, the target slave listened to is returned to main website Refresh Data response dump to data capture memory block.
Step S714, judge in Refresh Data response, whether state information byte has the mark of remote I/O mistake.If have, then perform step S719, if do not have, then perform step S715.
Step S715, judge the mark whether having had station information transmission in Refresh Data response in state information byte.If have, then perform skin S719, if do not have, then perform step S716.
Step S716, judge whether the check digit in Refresh Data response in state information byte has correct mark, if having, then perform step S717, if do not have, then perform step S719.
Step S717, CRC check is carried out to data refresh response, and judge that whether CRC check is correct.If correct, perform step S718 otherwise perform step S719.
Step S718, from Refresh Data response, extract desired data, and be supplied to application program, process ends.
Step S719, abandon Refresh Data response, process ends.
Below corresponding to said method embodiment, the structure of remote IO station of the present invention is described.
Please refer to Fig. 8, is the structural representation that CC-Link/LT medium-long range IO provided by the invention stands.It comprises:
Intercepting module 1, returning to the Refresh Data response of main website for intercepting target slave.
Trapping module 2, returns to for the direct target slave from listening to the Refresh Data response of main website and catches desired data.
Below in conjunction with an example, the present embodiment is described: suppose station number be 2 remote IO station (hereinafter referred to as " data source slave station ") want certain data to be passed to the remote IO station (hereinafter referred to as " market demand slave station ") that station number is 5.So, in the conventional mode, first the mode that data respond with Refresh Data is sent to main website by data source slave station, then in the circulation of next Refresh Data, is passed to market demand slave station by main website in the mode of Refresh Data.After adopting the present embodiment, in Refresh Data circulation, intercept module 1 meeting to intercept the Refresh Data response that other slave station feeds back to main website, when intercept module 1 listen to data source slave station feed back to main website Refresh Data response time, directly from this Refresh Data responds, required data are caught by trapping module 2, and omit main website and forward this link, to reduce communication delay, improve real-time communication.
In addition, in CC-Link/LT, comprise and also can make Refresh Data response to main website as market demand from the remote IO station of journey, therefore intercepting module 1, to perform the key point intercepted be how to know that the Refresh Data message listened to derives from target slave, therefore as shown in Figure 8, intercept module 1 to comprise: processing unit 11, for when receiving the Refresh Data message of main website broadcast, initialization is intercepted counter and is started slot timer, and when the timing of slot timer arrives, add up to intercepting counter.According to the station number of the value and target slave of intercepting counter, judging unit 12, for judging that the data that current time slots listens to rustle and whether should derive from target slave.Indicating member 13, for when the judged result of judging unit 12 is for being, instruction trapping module 2 directly from target slave return to main website Refresh Data response catch desired data.
In addition, trapping module 2 directly returns to from target slave catches in this process of desired data the Refresh Data response of main website, may clash with the existing communication of remote IO station, in order to address this problem, as shown in Figure 8, trapping module 2 comprises: unloading unit 21, Refresh Data response for the target slave listened to being returned to main website dumps to data capture memory block, wherein, the similar of the communication memory block in the structure of data capture memory block and current CC-Link/LT, can be as seen from Figure 6.But both are separate, be independent of each other.The object of data capture memory block is set up separately to be avoid clashing with the data space of this station proper communication.Capturing unit 22, extracts desired data during the Refresh Data for storing from data capture memory block responds; Concrete, capturing unit 22, before extraction desired data, needs check data to catch the validity of the Refresh Data response that memory block stores; Only have to work as Refresh Data response that inspection stores to data capture memory block effective time, just from the Refresh Data response that data capture memory block stores, extract desired data, be supplied to application program and use.Wherein, when only having that condition meets simultaneously below, just think that Refresh Data response effectively, these conditions are: the state information byte medium-long range IO error bit in Refresh Data response, the mark of information transmission of standing position and check digit do not represent error-free, do not transmit, correctly, and the CRC check of carrying out data refresh response is correct.
What finally illustrate is, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not departing from aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (6)
1. CC-Link/LT medium-long range IO stands and obtains a method for other slave station data, it is characterized in that: comprising: remote IO station intercepts the Refresh Data response that target slave returns to main website; Described remote IO station directly returns to the Refresh Data response of main website from the target slave listened to and catches desired data;
Described remote IO station intercepts the Refresh Data response that target slave returns to main website, comprising:
When described remote IO station receives the Refresh Data message of main website broadcast, initialization is intercepted counter and is started slot timer, and when the timing of slot timer arrives, adds up to described counter of intercepting;
Judge whether the Refresh Data response that current time slots listens to derives from target slave according to the station number of the described value and target slave of intercepting counter;
When judged result is for being, performs described remote IO station and directly returning to the step of catching desired data the Refresh Data response of main website from the target slave listened to;
When described remote IO station receives the Refresh Data message of main website broadcast, the value that counter is intercepted in initialization is 1; When the described value intercepting counter is equal with the station number of described target slave, judge that the Refresh Data response that current time slots listens to derives from target slave.
2. the method for claim 1, is characterized in that: described remote IO station directly returns to the Refresh Data response of main website from the target slave listened to and catches desired data, comprising:
The Refresh Data response that the target slave listened to is returned to main website by described remote IO station dumps to data capture memory block, and the communication memory block in described data capture memory block and described CC-Link/LT is separate;
Desired data is extracted from the Refresh Data response that described data capture memory block stores.
3. method as claimed in claim 2, is characterized in that: extract desired data the described Refresh Data stored from described data capture memory block responds, comprising:
The validity of the Refresh Data response checking described data capture memory block to store;
When the Refresh Data response checking described data capture memory block to store is effective, from the Refresh Data response that described data capture memory block stores, extract desired data.
4. method as claimed in claim 3, it is characterized in that: when the mark of the state information byte medium-long range IO error bit in the Refresh Data response that described data capture memory block stores, information transmission of stand position and check digit represent error-free respectively, do not transmit, correctly time, and the CRC check of Refresh Data response that stores of described data capture memory block correct time, assert that the Refresh Data response that described data capture memory block stores is effective.
5. the remote IO station in CC-Link/LT, for the data of other slave station in the same CC-Link/LT of quick obtaining, is characterized in that: comprising: intercept module, returns to the Refresh Data response of main website for intercepting target slave; Trapping module, returns to for the direct target slave from listening to the Refresh Data response of main website and catches desired data;
Described module of intercepting comprises:
Processing unit, for when receiving the Refresh Data message of main website broadcast, initialization is intercepted counter and is started slot timer, and when the timing of slot timer arrives, adds up to described counter of intercepting;
Judging unit, the station number for the value and target slave of intercepting counter described in basis judges whether the Refresh Data response that current time slots listens to derives from target slave;
Indicating member, when the data listened to rustle and should derive from target slave, indicates described trapping module directly to return to the Refresh Data response of main website from described target slave and catches desired data for determining current time slots when described judging unit;
Described trapping module, comprising:
Unloading unit, dump to data capture memory block for the Refresh Data response described target slave listened to being returned to main website, the communication memory block in described data capture memory block and described CC-Link/LT is separate;
Capturing unit, extracts desired data during the Refresh Data for storing from described data capture memory block responds.
6. remote IO station as claimed in claim 5, is characterized in that: described capturing unit specifically for:
The validity of the Refresh Data response checking described data capture memory block to store, and when the Refresh Data response checking described data capture memory block to store is effective, from the Refresh Data response that described data capture memory block stores, extract desired data.
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| EP1024618A2 (en) * | 1999-01-26 | 2000-08-02 | Siemens Aktiengesellschaft | Device for synchronising at least one remote module with a central module |
| CN101059897A (en) * | 2006-04-21 | 2007-10-24 | 同济大学 | A novel tunnel fire pre-warning system and control method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1024618A2 (en) * | 1999-01-26 | 2000-08-02 | Siemens Aktiengesellschaft | Device for synchronising at least one remote module with a central module |
| CN101059897A (en) * | 2006-04-21 | 2007-10-24 | 同济大学 | A novel tunnel fire pre-warning system and control method |
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| "侦听模式在数据采集中的应用";陈青;《冶金自动化》;20070930;正文第2栏第1行到第6栏第3行 * |
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