CN103312576A - Method and equipment for capturing data for remote IO (Input/Output) station of CC Link/LT (Control & CommunicationLink/LT) - Google Patents
Method and equipment for capturing data for remote IO (Input/Output) station of CC Link/LT (Control & CommunicationLink/LT) Download PDFInfo
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Abstract
The invention provides a method for acquiring the data of other slave stations for a remote IO (Input/Output) station in CC Link/LT (Control & CommunicationLink/LT) and the remote IO station, wherein the method comprises the following steps of intercepting the data-refreshing response of a target slave station returned to a main station by the remote IO station; and directly capturing the required data from the intercepted data-refreshing response of the target slave station returned to the main station by the remote IO station. The remote IO station mainly comprises an intercepting module and a capturing module. By adopting the invention, because the required data is directly captured from the data-refreshing response of the target slave station returned to the main station by the remoter IO station, and the intermediate link of main-station retransmission is not needed, the delay can be reduced, and the real-time property is improved.
Description
Technical field
The present invention relates to automation control area, relate in particular to the method and apparatus of a kind of CC-Link/LT remote I/O station capture-data, refer to that specifically CC-Link/LT medium-long range IO station obtains method and the remote I/O station of other slave station data.
Background technology
CC-Link(Control﹠amp; Communication Link, control and communication link system) be the field network system of the control of a kind of simultaneously high speed processing and 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 the application of carrying out transducer, actuator or other small-sized I/O (Input/output, I/O) specially, has excellent performance and can reduce greatly wiring.
At present, the bus topolopy of CC-Link/LT as shown in Figure 1, it mainly is made of a main website and a plurality of (being less than or equal to 64) slave station, wherein slave station comprises: remote I/O station and remote device station, wherein the I/O of " bit data " only can be carried out in the remote I/O station, 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(Broadcast Polling+Interval Timed Response, the broadcasting poll adds blanking time response) communication mode, the characteristics of this kind communication mode are, in the Refresh Data circulation, by main website to whole slave station broadcast data updates, after each slave station receives the Refresh Data message, take out independently main website and be handed down to oneself RY(position output) data, then between slave station according to station number order from small to large, successively main website being responded, with the input of separately RX(position) data upload is to main website.According to above-mentioned Refresh Data process, at present among the CC-Link/LT, the process that the remote I/O station obtains other slave station data is: at current poll in the refresh cycle, when making communication response from standing in to main website by other, the data that needs sent to the remote I/O station send to main website, then at next poll in the refresh cycle, when initiating the Refresh Data broadcast communication to whole slave stations, be handed down to the remote I/O station in the mode of Refresh Data by main website.The problem that this kind mode exists is to send data from other slave station and receive this middle existence delay of a poll refresh cycle nearly of these data to the remote I/O station, thereby when causing the remote I/O station to obtain other slave station data, have the low problem of real-time.
Summary of the invention
In view of this, the invention provides method and the remote I/O station that a kind of CC-Link/LT medium-long range IO station obtains other slave station data.In the time of can overcoming prior art medium-long range IO station and obtain other slave station data, the low problem of real-time owing to there being larger delay.
CC-Link/LT medium-long range IO provided by the invention station obtains the method for other slave station data, comprising: the Refresh Data response that the target slave station returns to main website is intercepted at the remote I/O station; Remote I/O is stood erectly to connect from the target slave station that listens to returns to the Refresh Data response of main website and is caught desired data.
Further, the Refresh Data response that the target slave station returns to main website is intercepted at the remote I/O station, comprise: when the remote I/O station receives the Refresh Data message of main website broadcasting, initialization is intercepted counter and is started the slot timing device, and when the timing of slot timing device arrives, cumulative to intercepting counter; Judge according to the station number of the value of intercepting counter and target slave station the data that current time slots listens to rustle whether to derive from the target slave station; When judged result when being, carry out the step of from the target slave station that listens to returns to the Refresh Data response of main website, catching desired data.
Further, when the remote I/O station received the Refresh Data message of main website broadcasting, the value that counter is intercepted in initialization was 1; When the value of intercepting counter equates with the station number of target slave station, judge that the Refresh Data response that current time slots listens to derives from the target slave station.
Further, remote I/O is stood erectly to connect from the target slave station that listens to returns to the Refresh Data response of main website and is caught desired data, comprise: the remote I/O station dumps to the data capture memory block with the Refresh Data response that the target slave station that listens to returns to main website, and wherein the existing memory block of communicating by letter is separate among data capture memory block and the CC-Link/LT; From the Refresh Data response of data capture storage area stores, extract desired data.
Further, extract desired data from the Refresh Data response of data capture storage area stores, comprising: check data is caught the validity of the Refresh Data response of storage area stores; When check responds when effective to the Refresh Data of data capture storage area stores, from responding, the Refresh Data of data capture storage area stores extracts desired data.
Further, when the sign of the remote I/O error bit in the state information byte in the response of the Refresh Data of data capture storage area stores, stand communication position and check digit represent respectively error-free, transmission, correctly the time, and when the CRC check of the Refresh Data of data capture storage area stores response is correct, assert the Refresh Data response of data capture storage area stores effectively.
The present invention also provides the station of the remote I/O among a kind of CC-Link/LT, is used for the data of same other slave station of CC-Link/LT of quick obtaining, and it comprises: intercept module, be used for intercepting the Refresh Data response that the target slave station returns to main website; Trapping module, desired data is caught in the Refresh Data response that is used for directly returning to from the target slave station that listens to main website.
Further, intercept module and comprise: processing unit, be used for when receiving the Refresh Data message of main website broadcasting, initialization is intercepted counter and is started the slot timing device, and when the timing of slot timing device arrives, cumulative to intercepting counter; Judging unit is used for according to intercepting the value of counter and the station number of target slave station judges the data that current time slots listens to rustle whether to derive from the target slave station; Indicating member is used for rustling should derive from the target slave station time when data that judgment unit judges listens to current time slots, catches desired data the Refresh Data of indicating trapping module directly to return to main website from the target slave station responds.
Further, trapping module comprises: the unloading unit, dump to the data capture memory block for the Refresh Data response that the target slave station that listens to is returned to main website, and wherein the data capture memory block is separate with the memory block of communicating by letter among the CC-Link/LT; Capturing unit is used for extracting desired data from the Refresh Data response of data capture storage area stores.
Further, capturing unit, concrete be used for the validity that check data is caught the Refresh Data response of storage area stores, and respond when effective to the Refresh Data of data capture storage area stores when check, from the Refresh Data of data capture storage area stores responds, extract desired data.
Beneficial effect of the present invention:
In the embodiment of the invention, because standing erectly to connect from the target slave station returns to the Refresh Data response of main website, remote I/O catches desired data, do not need main website to transmit this intermediate link, therefore the remote I/O station can other slave station of quick obtaining data, solved prior art medium-long range IO station obtain other slave station data delay late greatly, problem that real-time is low.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples:
Fig. 1 is the network topological diagram of CC-Link/LT.
Fig. 2 is the schematic flow sheet of the first embodiment of the CC-Link/LT medium-long range IO provided by the invention station method of obtaining other slave station data.
Fig. 3 is the schematic flow sheet of the second embodiment of the CC-Link/LT medium-long range IO provided by the invention station method of obtaining other slave station data.
Fig. 4 is Refresh Data sequential chart among the CC-Link/LT.
Fig. 5 is the schematic flow sheet of the 3rd embodiment of the CC-Link/LT medium-long range IO provided by the invention station method of obtaining 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 of the 4th embodiment of the CC-Link/LT medium-long range IO provided by the invention station method of obtaining other slave station data.
Fig. 8 is the structural representation of the embodiment at CC-Link/LT medium-long range IO provided by the invention station.
Embodiment
The invention relates to the scheme that the remote I/O 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 of the first embodiment of the CC-Link/LT medium-long range IO provided by the invention station method of obtaining other slave station data.The method flow of Fig. 2 comprises:
The Refresh Data response that the target slave station returns to main website is intercepted at step S21, remote I/O station.
Step S22, remote I/O are stood erectly to connect from the target slave station that listens to returns to the Refresh Data response of main website and are caught desired data.
Wherein, the target slave station can be the remote I/O station, also can be remote device station.
Wherein, specifically which slave station can be specified at system design stage in advance as the target slave station at remote I/O station.
Wherein, remote I/O stand in 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 Refresh Data response between other irrelevant slave station and the main website, will not deal with and directly abandon.When the Refresh Data message between the target slave station that listens to prior appointment and the main website, according to the input data of determining in advance required quick obtaining at system design stage, the Refresh Data response between target slave station and main website, the needed data of fast Acquisition
Below in conjunction with example explanation the present embodiment: suppose at system design stage, specifying in advance station number is that to need the quick obtaining station number be data in 2 the remote I/O station (being designated hereinafter simply as " data source slave station ") for 5 remote I/O station (being designated hereinafter simply as " market demand slave station ").So, in the Refresh Data circulation, market demand will be intercepted the Refresh Data response that other slave station feeds back to main website from standing-meeting, when Refresh Data when response that listens to the data source slave station and feed back to main website, directly from this Refresh Data response, catch required data, thereby omit main website and transmit this link, to reach the reduction communication delay, improve the purpose of real-time communication.
Embodiment two:
In CC-Link/LT, comprise as market demand and also can make the Refresh Data response to main website from the remote I/O station of journey, therefore the key point of step S21 is how to know that the Refresh Data response that listens to derives from the target slave station, and the present embodiment is devoted to address this problem.
Please refer to Fig. 3, is the schematic flow sheet of the second embodiment of the CC-Link/LT medium-long range IO provided by the invention station method of obtaining other slave station data.The method flow of Fig. 3 comprises:
Step S31, when receiving the Refresh Data message of main website broadcasting, initialization is intercepted counter and is started the slot timing device.
Step S32, when the timing of slot timing device arrives, cumulative to intercepting counter.
Step S33, basis is intercepted the value of counter and the station number of target slave station judges the data that current time slots listens to rustle whether to derive from the target slave station.
Step S34, when judged result when being, directly from the target slave station returns to the Refresh Data response of main website, catch desired data.
Wherein, as shown in Figure 4, be the time slot map of Refresh Data process among the CC-Link/LT.Can find out from this time slot map, each slave station carries out Gap response to main website, and in the situation that baud rate is fixing, the value of each time slot is identical.Therefore in Fig. 3 embodiment, can design a slot timing device and distinguish the Refresh Data response of each slave station according to time slot, design simultaneously one and intercept counter and be used for judging whether to be that the Refresh Data that the target slave station that will catch returns to main website responds.
Concrete, be 1 with the value initialization of intercepting counter, when the timing of slot timing device arrives 1 time, add 1 to intercepting counter.So in a certain time slot, when the value of intercepting counter equates with the station number of target slave station, show then that Refresh Data that current time slots listens to responds to derive from the target slave station.
Embodiment three:
Directly from the target slave station returns to the Refresh Data response of main website, catch in this process of desired data among the step S22, may clash with existing communication the in remote I/O station, so the present embodiment has proposed following method and addressed this problem being devoted to.
Please refer to Fig. 5, is the schematic flow sheet of the 3rd embodiment of the CC-Link/LT medium-long range IO provided by the invention station method of obtaining other slave station data.The method flow of Fig. 5 comprises:
The Refresh Data response that the target slave station returns to main website is intercepted at step S51, remote I/O station.
Step S52, remote I/O station dump to the data capture memory block with the Refresh Data response that the target slave station that listens to returns to main website.
Wherein, the structure of the memory block of communicating by letter among the structure of data capture memory block and the present CC-Link/LT is similar, specifically can be with reference to shown in Figure 6.But the data capture memory block is separate with the memory block of communicating by letter, and is independent of each other.Set up separately the order of data capture memory block to avoid the data space with this station proper communication to clash with regard to being.
Step S43, from the response of the Refresh Data of data capture storage area stores, extract desired data.
Wherein, before extracting desired data, need check data to catch the validity of the Refresh Data response of storage area stores; Only have and to work as check and respond when effective to the Refresh Data of data capture storage area stores, just from the Refresh Data response of data capture storage area stores, extract desired data, offer the application program use.Wherein, when only having following condition to satisfy simultaneously, think that just the Refresh Data response effectively, these conditions are: the remote I/O error bit in the state information byte in the Refresh Data response, the sign of stand communication position, check digit represent respectively error-free, not transmission, correct, and the CRC check that the data refresh response is carried out is correct, wherein CRC is " Cyclic Redundancy Check, CRC ", is a kind of error checking and correction mode the most frequently used in the data communication field.
Embodiment four:
The present embodiment is the detailed description of CC-Link/LT medium-long range IO station being obtained the method for other slave station data, and this embodiment comprises realization many details of the present invention, although many details those skilled in the art are fully aware of.Simultaneously, the present embodiment has also increased such as functions such as listening functions ON/OFF.
Please refer to Fig. 7, is the schematic flow sheet of the 4th embodiment of the CC-Link/LT medium-long range IO provided by the invention station method of obtaining other slave station data.It comprises:
After step S701, the i that stands receive message, judge whether the A1 in the message equals 5E, 6E or 7E.If, execution in step S52 then, otherwise execution in step S56.
Wherein, i is less than or equal to 64 positive integer, and the i that stands namely is as the remote I/O station of market demand slave station in the embodiment of the invention.In CC-Link/LT, the basic format of the transmission data transfer frame 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, when A1=5E, represent that this message is the Refresh Data message of main website broadcasting.When 8 dot pattern, when A1=6E, represent that this message is the Refresh Data message of main website broadcasting.When 16 dot pattern, when A1=7E, represent that this message is the Refresh Data message of main website broadcasting.
Step S702, startup message listening functions.
Step S703, initialization are intercepted counter and are started the slot timing device.Preferably, to intercept counter be 1 in initialization.Wherein the timing length of slot timing device is a slot length in this Refresh Data circulation.
S704, judge whether current time slots needs our station to reply main website.If judged result is yes, execution in step S705.Otherwise, execution in step S707.
Step S705, to main website return data refresh response, execution in step S706.
Step S706, judge whether the message listening functions of our station closes.If close, execution in step S707, otherwise execution in step S708.
Step S707, communicate process ends according to the CC-Link/LT pattern of standard.
Step S708, judge whether the slot timing device arrives.If arrive, execution in step S709 then, otherwise continue to judge.
Step S709, intercept counter and add 1.
Step S710, judge whether the Refresh Data response that required target slave station of intercepting returns to main website.If, execution in step S711, otherwise execution in step S704.Wherein, when the value of intercepting counter equated with the value of the station number of target slave station, judged result was yes.
Step S711, stop the message listening functions.
Step S712, Initial message are intercepted counter=1.This step can be omitted, and mainly is to prepare in order to intercept next time herein.
Step S713, the Refresh Data response that the target slave station that listens to is returned to main website dump to the data capture memory block.
Step S714, judge whether state information byte in the Refresh Data response has the sign of remote I/O mistake.If have, execution in step S719 then, if do not have, execution in step S715 then.
Step S715, judge whether the sign of finishing the station communication is arranged in the state information byte in the Refresh Data response.If have, then carry out skin S719, if do not have, execution in step S716 then.
Step S716, judge whether the check digit in the state information byte has correct sign in the Refresh Data response, if having, execution in step S717 then, if do not have, execution in step S719 then.
Step S717, the data refresh response is carried out CRC check, and judge whether CRC check is correct.If correct, execution in step S718 otherwise execution in step S719.
Step S718, from Refresh Data response, extract desired data, and offer application program, process ends.
Step S719, abandon Refresh Data response, process ends.
The below is corresponding to said method embodiment, and the structure at remote I/O of the present invention station is described.
Please refer to Fig. 8, is the structural representation at CC-Link/LT medium-long range IO provided by the invention station.It comprises:
Trapping module 2, desired data is caught in the Refresh Data response that is used for directly returning to from the target slave station that listens to main website.
Below in conjunction with example explanation the present embodiment: suppose that station number is that 2 remote I/O station (being designated hereinafter simply as " data source slave station ") wants that it is 5 remote I/O station (being designated hereinafter simply as " market demand slave station ") that certain data is passed to station number.So, in the conventional mode, the data source slave station at first is sent to main website with data in the mode of Refresh Data response, then in next Refresh Data circulation, is passed to the market demand slave station by main website in the mode of Refresh Data.After adopting the present embodiment, in the Refresh Data circulation, intercepting module 1 meeting intercepts the Refresh Data response that other slave station feeds back to main website, listen to Refresh Data when response that the data source slave station feeds back to main website when intercepting module 1, directly from this Refresh Data response, catch required data by trapping module 2, transmit this link and omit main website, to reduce communication delay, improve real-time communication.
In addition, in CC-Link/LT, comprise as market demand and also can make the Refresh Data response to main website from the remote I/O station of journey, therefore intercept module 1 and carry out the key point of intercepting is how to know that the Refresh Data message that listens to derives from the target slave station, therefore as shown in Figure 8, intercepting module 1 comprises: processing unit 11, be used for when receiving the Refresh Data message of main website broadcasting, initialization is intercepted counter and is started the slot timing device, and when the timing of slot timing device arrives, cumulative to intercepting counter.Judging unit 12 is used for according to intercepting the value of counter and the station number of target slave station judges the data that current time slots listens to rustle whether to derive from the target slave station.Indicating member 13 is used in the judged result of judging unit 12 when being, indication trapping module 2 directly from the target slave station return to main website Refresh Data catch desired data responding.
In addition, trapping module 2 is directly caught in this process of desired data from the target slave station returns to the Refresh Data response of main website, may clash with existing communication the in remote I/O station, in order to address this problem, as shown in Figure 8, trapping module 2 comprises: unloading unit 21, dump to the data capture memory block for the Refresh Data response that the target slave station that listens to is returned to main website, wherein, the structure of the memory block of communicating by letter among the structure of data capture memory block and the present CC-Link/LT is similar, can be as seen from Figure 6.But both are separate, are independent of each other.Set up separately the purpose of data capture memory block to be, avoid clashing with the data space of this station proper communication.Capturing unit 22 is used for extracting desired data from the Refresh Data response of data capture storage area stores; Concrete, capturing unit 22 needed check data to catch the validity of the Refresh Data response of storage area stores before extracting desired data; Only have and to work as check and respond when effective to the Refresh Data of data capture storage area stores, just from the Refresh Data response of data capture storage area stores, extract desired data, offer the application program use.Wherein, when only having following condition to satisfy simultaneously, think that just the Refresh Data response effectively, these conditions are: the state information byte medium-long range IO error bit in the Refresh Data response, the sign of stand communication position and check digit do not represent error-free, not transmission, correct, and the CRC check that the data refresh response is carried out is correct.
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/LT medium-long range IO station obtains the method for other slave station data, it is characterized in that: comprising: the Refresh Data response that the target slave station returns to main website is intercepted at the remote I/O station; Described remote I/O is stood erectly to connect from the target slave station that listens to returns to the Refresh Data response of main website and is caught desired data.
2. the method for claim 1 is characterized in that: the Refresh Data response that the target slave station returns to main website is intercepted at described remote I/O station, comprising:
When described remote I/O station received the Refresh Data message of main website broadcasting, initialization was intercepted counter and is started the slot timing device, and when the timing of slot timing device arrives, cumulative to the described counter of intercepting;
Intercept the value of counter and the station number of target slave station judges the data that current time slots listens to rustle whether to derive from the target slave station according to described;
When judged result when being, carry out described remote I/O and stand erectly and connect the step of from the target slave station that listens to returns to the Refresh Data response of main website, catching desired data.
3. method as claimed in claim 2 is characterized in that: when described remote I/O station received the Refresh Data message of main website broadcasting, the value that counter is intercepted in initialization was 1; When the described value of intercepting counter equates with the station number of described target slave station, judge that the Refresh Data response that current time slots listens to derives from the target slave station.
4. such as each described method among the claim 1-3, it is characterized in that: described remote I/O is stood erectly to connect from the target slave station that listens to returns to the Refresh Data response of main website and is caught desired data, comprising:
Described remote I/O station dumps to the data capture memory block with the Refresh Data response that the target slave station that listens to returns to main website, and described data capture memory block is separate with the memory block of communicating by letter among the described CC-Link/LT;
From the Refresh Data response of described data capture storage area stores, extract desired data.
5. method as claimed in claim 4 is characterized in that: describedly extract desired data from the Refresh Data response of described data capture storage area stores, comprising:
Check the validity of the Refresh Data response of described data capture storage area stores;
When check responds when effective to the Refresh Data of described data capture storage area stores, from responding, the Refresh Data of described data capture storage area stores extracts desired data.
6. method as claimed in claim 5, it is characterized in that: when the sign of the state information byte medium-long range IO error bit in the response of the Refresh Data of described data capture storage area stores, stand communication position and check digit represent respectively error-free, transmission, correctly the time, and when the CRC check of the Refresh Data of described data capture storage area stores response is correct, assert the Refresh Data response of described data capture storage area stores effectively.
7. the remote I/O station among the CC-Link/LT is used for the data of same other slave station of CC-Link/LT of quick obtaining, it is characterized in that: comprising: intercept module, be used for intercepting the Refresh Data response that the target slave station returns to main website; Trapping module, desired data is caught in the Refresh Data response that is used for directly returning to from the target slave station that listens to main website.
8. remote I/O as claimed in claim 7 station, it is characterized in that: the described module of intercepting comprises:
Processing unit is used for when receiving the Refresh Data message of main website broadcasting, and initialization is intercepted counter and started the slot timing device, and when the timing of slot timing device arrives, cumulative to the described counter of intercepting;
Judging unit is used for intercepting the value of counter and the station number of target slave station judges the data that current time slots listens to rustle whether to derive from the target slave station according to described;
Indicating member is used for rustling should derive from the target slave station time when data that described judgment unit judges listens to current time slots, catches desired data the Refresh Data of indicating described trapping module directly to return to main website from described target slave station responds.
9. such as claim 7 or 8 described remote I/O stations, it is characterized in that: described trapping module comprises:
The Refresh Data response that unloading unit, the described target slave station that is used for listening to return to main website dumps to the data capture memory block, and described data capture memory block is separate with the memory block of communicating by letter among the described CC-Link/LT;
Capturing unit is used for extracting desired data from the Refresh Data response of described data capture storage area stores.
10. remote I/O as claimed in claim 9 station, it is characterized in that: described capturing unit specifically is used for:
Check the validity of the Refresh Data response of described data capture storage area stores, and respond when effective to the Refresh Data of described data capture storage area stores when check, from the Refresh Data of described data capture storage area stores responds, extract desired data.
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| CN114338712A (en) * | 2021-12-29 | 2022-04-12 | 中电九天智能科技有限公司 | Method for solving problem of insufficient memory and untimely refreshing speed of CC-Link IE network |
| CN114338712B (en) * | 2021-12-29 | 2023-10-24 | 中电九天智能科技有限公司 | Method for solving problem of insufficient memory and untimely refresh rate of CC-Link IE network |
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