CN102651695A - Method for improving wireless frequency expansion net bridge communication reliability - Google Patents
Method for improving wireless frequency expansion net bridge communication reliability Download PDFInfo
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- CN102651695A CN102651695A CN201110044381XA CN201110044381A CN102651695A CN 102651695 A CN102651695 A CN 102651695A CN 201110044381X A CN201110044381X A CN 201110044381XA CN 201110044381 A CN201110044381 A CN 201110044381A CN 102651695 A CN102651695 A CN 102651695A
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Abstract
The invention relates to a method for improving the wireless frequency expansion net bridge communication reliability. The method comprises the following steps that: 1) a communication port of a data collection terminal is set into Freeport through a programmable logic controller (PLC), and in addition, the communication port is initialized; 2) the PLC carries out optimization processing on the transmitted data; 3) the data subjected to the optimization processing in the second step is stored into a data buffer region; and 4) the data in the data buffer region is sent through sending instructions by a metal oxide varistor (MOV). Compared with the prior art, the method has the advantages that the control on the data communication port is added, so the data collection terminal has the intelligent communication function, the data optimization transmission according to the network is realized, and the like.
Description
Technical field
The present invention relates to a kind of correlation technique that improves communication reliability, especially relate to a kind of method that improves wireless frequency expansion bridging communication reliability.
Background technology
(1) after the operation of wireless frequency expansion bridge system, along with the increase of network node and data traffic, it is imperfect that each work station monitor supervision platform video data appears in system, is all not show sometimes.
(2) server communication failure number of times increases greatly.A large amount of communication failure error messages occurring at the monitor service platform, mainly is in the website that reads some the larger data collection capacity error message that takes place frequently.
(3) server causes the paralysis of whole system because of communication failure phenomenon takes place down in extreme case; And number of times is more and more frequent with the increase of node number; The normal operation of the system of giving brings very big hidden danger; System can only be after server breaks down, and the mode of taking to reset server is come recovery system.
Summary of the invention
The object of the invention is exactly for the defective that overcomes above-mentioned prior art existence a kind of method that improves wireless frequency expansion bridging communication reliability to be provided.
The object of the invention can be realized through following technical scheme:
A kind of method that improves wireless frequency expansion bridging communication reliability is characterized in that, may further comprise the steps:
1) through PLC the port of data acquisition terminal is set to Freeport, and initialization;
2) PLC is optimized processing to the data of transmission;
3) with step 2) in storage after the optimization process to data buffer area;
4) send instruction through MOV and send the data in the data buffer area.
Described Freeport is the port of full open model, can be by the user through self-defining communication protocol to realize communicating by letter between monitor supervision platform and data collection station.
Described optimization process comprises:
1) deletion invalid data;
2) discern invalid data automatically, and deletion;
3) data of fixing a breakdown.
Compared with prior art, the present invention has the following advantages:
1) owing to increased control, makes data collection station possess the function of intelligence communication, realized according to network to the data COM1.
2) port device program control, non-maintaining system.
3) digital configuration, Control on Communication are convenient to preserve and retrieval accurately and reliably.
4) can optimize network traffics, avoid the phenomenon of the system crash that network blockage causes, improve the operational reliability of network system.
5) stable and reliable for performance, need not the personal management, directly network, stability, the reliability of system improve greatly, need not the personal management.
Description of drawings
Fig. 1 is a data flow diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is elaborated.
Embodiment 1
As shown in Figure 1, a kind of method that improves wireless frequency expansion bridging communication reliability may further comprise the steps:
1) through PLC the port of data acquisition terminal is set to Freeport, and initialization;
2) PLC is optimized processing to the data of transmission;
3) with step 2) in storage after the optimization process to data buffer area;
4) send instruction through MOV and send the data in the data buffer area.
1, PLC is to sending the control of data;
The port of data collection station comprises PPI and Freeport (configuration interface) two states.The configuration interface standard-sized sheet is put, can be by the user through program oneself definition communication protocol with communicating by letter between realization monitor supervision platform and data collection station.Promptly can realize functional requirement through self-defining communication protocol to the control of data flow.
1. initialization: Freeport initialization.The initialization of data collection station port is provided with and realizes through communication controler CMG32 being carried out the position.
2. communication instruction: data collection station has special transmission command M OV to send data, and before sending data, the storage that should be earlier institute will be sent is utilized MOV FILE PORT to instruct and just can be sent data in the FILE data buffer zone.Wherein the network service mouth of PORT instruction specific data acquisition terminal produces one and sends the interrupt signal that finishes when data are sent end.The end interrupt handling procedure is sent in establishment, so that the processing after sending.Data collection station receives character through communication controler.MEM is a temporary buffer, when receive be a character string time, this buffer is with character ground reception of a character, character of every reception just produces an interruption, interrupt event number is 8.An interrupt routine through data collection station is connected on this interrupt event, just can handle the character that receives.
3. in program, set up the network data buffering area, all be stored in all data of communicating by letter between data collection station and the server in the data buffer zone, data collection station sends command M OV and requires maximum store data number must not surpass the 1K byte.Send data to network and deposit successively, first deposit data sequence 0, other follow-up datas are confirmed its actual address with respect to 0 address.For the I/O port data then map in the corresponding I/O address of tables of data.Make the control of the transfer of data between data collection station and the monitor service platform become possibility like this.
2, the optimization of transmission data
Optimized Measures 1: deletion invalid data.In the system development debug process, can retain a part of invalid data, this part data also can take the bandwidth of network service; Therefore; When the data acquisition terminal is carried out transformation and upgrade, the invalid data of retaining is cleared up and the similar terms merging, optimized data flow architecture.
Optimized Measures 2: the floor data for the overflow threshold value becomes invalid data, and the data collection station organized data detects subprogram it is screened processing automatically, has improved data communication efficient.
Optimized Measures 3: because system (needs just to abandon this fault data through duplicate detection repeatedly for the communication efficiency of fault data is minimum usually; Therefore; Data collection station has added the fault position to the data acquisition frame, is in communication failure or equipment fault in case find these data, just stops communication; Up to fault restoration, eliminate the fault position.
Compare uncontrolled communication, this programme can be regulated control to data flow structure and port flow, thereby, make whole system have the advantage of complete networking.
Embodiment 2
Wusong water factory supervisory control system running 5 years from 1 PLC station (two pump houses) of beginning, has 6 PLC stations through enlarging transformation several times till now, 3 SE work stations, and 2 SE servers, supervisory control system is to adopt the mode of wireless connections to couple together all websites.
System's operation existing problems
Supervisory control system will put into operation from the end of the year 2005, along with increasing of website, phenomenons such as a large amount of communication failure error messages occur occurring in each site operation interface data demonstration, the increase of server communication failure number of times, the monitor service platform.Even cause the paralysis of whole system by the server communication failure, and number of times is more and more frequent, brings very big hidden danger to safety in production.The mode that generally can only take to reset server is come recovery system.
The analysis of causes
1) the communication bottleneck of radio station, whole system connects through radio station, and transfer of data is accomplished through wireless signal.The radio station of adopting is the RLX-IH radio station.Its quality and signal strength signal intensity are best in the like product.But its maximum amount of data is 11 megabyte/seconds, and (being 11,000,000 when signal strength signal intensity is best, generally is not reach 11 megabyte/seconds; Feeder line wherein; Joint, distance all can produce signal attenuation between the antenna), constantly increase at website; The data communication amount is also under the situation of at double increase, and the wireless telecommunications maximum amount of data can not further improve.Cause that the server communication failure constantly increases.Relatively stable from server operation in incipient 2 years.To the ordinary generation of fault in nearest a year, wireless antenna position and feeder line were also done adjustment communication were not helped much.
2) signal of radio set receives weather effect bigger, and at dense fog, raining heavily all can influence communication.Simultaneously will influence server work.
3) server than higher, particularly has redundant system to the requirement of communication robust property.In case the communication instability will influence the normal operation of server.
Solution
To above-mentioned situation, we transform each website PLC program, have added communication control program; Preset and control program to the network service port in RLX-IH radio station; Simultaneously, installed webmaster type core switch additional, through of the dispatching management of webmaster switch to the network port at monitoring client; Each port flow of reasonable distribution is optimized network service.Through above-mentioned transformation, the whole network operation is normal.
Claims (3)
1. a method that improves wireless frequency expansion bridging communication reliability is characterized in that, may further comprise the steps:
1) through PLC the port of data acquisition terminal is set to Freeport, and initialization;
2) PLC is optimized processing to the data of transmission;
3) with step 2) in storage after the optimization process to data buffer area;
4) send instruction through MOV and send the data in the data buffer area.
2. a kind of method that improves wireless frequency expansion bridging communication reliability according to claim 1; It is characterized in that; Described Freeport is the port of full open model, can be by the user through self-defining communication protocol to realize communicating by letter between monitor supervision platform and data collection station.
3. a kind of method that improves wireless frequency expansion bridging communication reliability according to claim 1 is characterized in that described optimization process comprises:
1) deletion invalid data;
2) discern invalid data automatically, and deletion;
3) data of fixing a breakdown.
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| CN201110044381XA CN102651695A (en) | 2011-02-23 | 2011-02-23 | Method for improving wireless frequency expansion net bridge communication reliability |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108965385A (en) * | 2018-06-06 | 2018-12-07 | 中建八局第二建设有限公司 | A kind of wireless data acquisition system and acquisition method based on WSN |
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| CN108965385A (en) * | 2018-06-06 | 2018-12-07 | 中建八局第二建设有限公司 | A kind of wireless data acquisition system and acquisition method based on WSN |
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Application publication date: 20120829 |