CN108600068A - A kind of data collection and transmission method in distributed measurement and control system - Google Patents
A kind of data collection and transmission method in distributed measurement and control system Download PDFInfo
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- CN108600068A CN108600068A CN201810302803.0A CN201810302803A CN108600068A CN 108600068 A CN108600068 A CN 108600068A CN 201810302803 A CN201810302803 A CN 201810302803A CN 108600068 A CN108600068 A CN 108600068A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L12/403—Bus networks with centralised control, e.g. polling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/10—Active monitoring, e.g. heartbeat, ping or trace-route
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/70—Admission control; Resource allocation
- H04L47/82—Miscellaneous aspects
- H04L47/822—Collecting or measuring resource availability data
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Abstract
The data collection and transmission method that the invention discloses a kind of in distributed measurement and control system, include the following steps：S1：Increase data collection module in front and back ends data collector,, active advance by data collection module obtains data to each data feed end in an orderly manner and buffers, before data are asked at demand data end, just required data collection is completed, when the data of each data feed end are asked at pending data demand end with polling mode, Back end data transceiver just takes out ready-made data from buffering area, and response is provided with speed as fast as possible；S2：Between data feed end and front end data transceiver, between the data collector of front and back ends, between demand data end and Back end data transceiver, three data communication subsystems are formed.The present invention substantially reduces the polling cycle in distributed measurement and control system, improves the overall efficiency of group data transmission, can make wired communication into wireless type communication to quick and cost-saving.
Description
Technical field
The present invention relates to field of communication technology more particularly to a kind of data collections and transmission in distributed measurement and control system
Method.
Background technology
In distributed measurement and control system, host carries out data friendship by bus form, with the module for being distributed in each measuring point
It changes, remotely measures and control to achieve the purpose that.Distributed measurement and control system is mainly by distributed host and each observing and controlling substation group
At wherein distributed host is mainly used for managing each substation, and the acquisition and control of data are completed in substation.For being adopted with data
For system based on collection, observing and controlling substation or preposition measurement module are data feed ends, and distributed host or its host computer are several
According to demand end.Between data feed end and demand data end, it is configured with one or more levels data collector, these data transmit-receives
Device constitutes data transfer path.Distributed measurement and control system is typically the system of master-slave network framework, and demand data end uses
Polling mechanism asks for measurement or status data to each data feed end.Typically, demand data end is supplied to the data of some ID
End sends out inquiry frame, and inquiry frame passes through UART, RS-485 bus, UART, wireless transmission, UART, RS-485 bus, UART successively
Reach corresponding data feed end；Data feed end passes through in-site measurement or state data acquisition process, or directly from buffering area
The data being previously stored are taken out, acknowledgement frame is organized into；Acknowledgement frame passes through the transmission path of reverse order, reaches demand data
End.This method is characterized in that, is taken between the various data collectors between data feed end and demand data end transparent
Transmission mode, data collector will not actively initiate inquiry-answering.Primary complete inquiry-answering is similar to
One relay race, required time be equal to each section of transmission path of both direction the time required to it is cumulative and, some TT＆C systems are also wanted
In addition the time of data feed end in-site measurement.For multiple data feed ends in system, need to repeat such ask one by one
Inquiry-answering, in cycles.Attached drawing 7- attached drawings 9 are respectively the typical structure schematic diagram of distributed measurement and control system and primary complete
Whole inquiry-answering schematic diagram.The deficiencies in the prior art are that polling cycle is longer, the overall effect of group data transmission
Rate is relatively low.
Invention content
Technical problems based on background technology, the present invention propose a kind of data receipts in distributed measurement and control system
Collection and transmission method.
A kind of data collection and transmission method in distributed measurement and control system proposed by the present invention, includes the following steps：
S1：Increase data collection module in front and back ends data collector, by data collection module in advance, actively, have
It obtains data to each data feed end and buffers to sequence, before data are asked at demand data end, just by required data
It collects and completes, when the data of each data feed end are asked at pending data demand end with polling mode, Back end data transceiver is just
Ready-made data are taken out from buffering area, and response is provided with speed as fast as possible；
S2：Between data feed end and front end data transceiver, between the data collector of front and back ends, demand data
Between end and Back end data transceiver, three relatively independent, concurrent working data communication subsystems are formed；
S3：In data feed end and front end data transceiver communications subsystem, front end data transceiver is with the angle of host
Color active obtains data to each data feed end in an orderly manner and keeps in；
S4：Front end data transceiver simultaneously remembers the data feed end that this group is connected in initial phase, automatic identification
The quantity of equipment, respective type and ID generate ID lists；
S5：Quantity, respective type and the ID for the data feed end that data collection module is connected according to this group, with each number
It is polled according to the original communication agreement of feed end, obtains the data of each data feed end, and update corresponding data buffer zone；
S6：In front and back ends data collector communication subsystem, Back end data transceiver with the role of host actively, have
Obtains data to each front end data transceiver and keep in sequence；
S7：The maximum slave quantity that can be supported according to RS-485, the data collection module of Back end data transceiver divide in advance
With 247 pieces of independent data buffer zones, it is used for the temporary data obtained from front end data transceiver；
S8：Back end data transceiver initiates poll by wireless transceiver, with proprietary protocol to front end data transceiver, often
The target of secondary inquiry, not specific front-end data collector, but data feed end device id；All front end data transceivers
Inquiry frame will be received, then judges whether the ID in inquiry frame is included in its ID list, if including, just get the bid, it is preceding
End data transceiver need to respond；Otherwise, it keeps silent；
S9：The data that acknowledgement frame is stored with the data buffer zone of corresponding ID in front end data Transceiver Data collection module
Based on, ID, device type, data length, address information and valid data are packaged, Back end data transceiver, which receives, answers
It answers, the data buffer zone that data are parsed by data collection module and are updated to corresponding ID；
S10：In demand data end and Back end data transceiver communications subsystem, Back end data transceiver as slave,
Receive all inquiries from demand data end and immediate answer；
S11：Back end data transceiver receives the inquiry frame from demand data end, parse ID, register address and
Quantity information；
S12：Back end data transceiver directly reads corresponding data according to ID from the buffering area of data collection module, by phase
The original communication protocol format answered is organized into acknowledgement frame, then sends out response and gives demand data end.
Preferably, in the S4, the process of automatic identification will execute one two and recirculate, outer circulation：ID is interior from 1 to 247
Cycle：The communication protocol of the data feed end type of all supports is attempted in each ID.
Preferably, the processing procedure of interior cycle be according to the feature of the communication protocol of corresponding data feed end type, in addition
ID initiates one or several inquiry-answerings；If receiving response and in accordance with expection, so that it may to determine device type simultaneously
And otherwise ID shows the type equipment that the ID is not present in this group.
Preferably, the data collection module supplies end equipment one block number of each distribution according to slow for the data connected in this group
Area is rushed, the temporary data obtained are used for.
Preferably, the data that each data buffer zone is stored, including ID, device type, data length, address information and
Valid data.
Compared with prior art, the beneficial effects of the invention are as follows：
1, it by the data collection module in data collector, obtains in advance, actively, in an orderly manner to each data feed end
Data are simultaneously kept in, and before data are asked at demand data end, are just completed required data collection.Pending data demand end with
When polling mode asks for the data of each data feed end, Back end data transceiver just takes out ready-made data from buffering area,
It can accelerate to provide response in this way, and promote integrated communication efficiency.Thus substantially reduce the wheel in distributed measurement and control system
The period is ask, the overall efficiency of group data transmission is improved.It is reflected on the monitor supervision platform of rear end, can quickly refresh each
The data or state of observing and controlling substation or preposition measurement module；
2, because data have been stored in the buffering area of itself by data collector in advance, so data collector can be treated as
Virtual " each data feed end ", allows demand data end that can read data according to original communication protocol, it is not necessary to because will
Wired communication makes wireless type into and needs to change soft and hardware, can make wired communication into quick and cost-saving wireless
Formula communicates.
3, when needing that by a series of inquiry-answerings one could be completed between demand data end and data feed end
When secondary complete communication process, the present invention is more considerable for the raising of whole system data communication efficiency.
Description of the drawings
Fig. 1 is the typical structure schematic diagram of the front end data transceiver of distributed measurement and control system in the content of present invention；
Fig. 2 is the typical structure schematic diagram of the Back end data transceiver of distributed measurement and control system in the content of present invention；
Fig. 3 is an inquiry-answering schematic diagram dominated by demand data end in the content of present invention；
Fig. 4 is an inquiry-answering schematic diagram dominated by front end data transceiver in the content of present invention；
Fig. 5 is an inquiry-answering schematic diagram dominated by Back end data transceiver in the content of present invention；
Fig. 6 is the photovoltaic plant monitoring system structure diagram in the embodiment of the present invention；
Fig. 7 is the typical structure schematic diagram of the Back end data transceiver of distributed measurement and control system in background technology；
Fig. 8 is the typical structure schematic diagram of the front end data transceiver of distributed measurement and control system in background technology；
Fig. 9 is primary complete inquiry-answering schematic diagram in background technology.
Specific implementation mode
The present invention is made further to explain with reference to specific embodiment.
Embodiment
Referring to Fig.1-6, a kind of data collection and transmission method in distributed measurement and control system, includes the following steps：
S1：Increase data collection module in front and back ends data collector, by data collection module in advance, actively, have
It obtains data to each data feed end and buffers to sequence, before data are asked at demand data end, just by required data
It collects and completes, when the data of each data feed end are asked at pending data demand end with polling mode, Back end data transceiver is just
Ready-made data are taken out from buffering area, and response is provided with speed as fast as possible；
S2：Between data feed end and front end data transceiver, between the data collector of front and back ends, demand data
Between end and Back end data transceiver, three relatively independent, concurrent working data communication subsystems are formed；
S3：In data feed end and front end data transceiver communications subsystem, front end data transceiver is with the angle of host
Color active obtains data to each data feed end in an orderly manner and keeps in；
S4：Front end data transceiver simultaneously remembers the data feed end that this group is connected in initial phase, automatic identification
The quantity of equipment, respective type and ID generate ID lists；The process of automatic identification will execute one two and recirculate, outer circulation：
ID is from 1 to 247, interior cycle：The communication protocol of the data feed end type of all supports is attempted in each ID, wherein interior cycle
Processing procedure is to be answered according to the feature of the communication protocol of corresponding data feed end type in addition ID initiates one or several inquiries-
Answer process；If receiving response and in accordance with expection, so that it may to determine otherwise device type and ID show in this group not simultaneously
There are the type equipment of the ID；
S5：Data collection module supplies end equipment respectively one piece of data buffer zone of distribution for the data connected in this group, uses
To keep in the data obtained, the data that each data buffer zone is stored, including ID, device type, data length, address information
And valid data；Quantity, respective type and the ID for the data feed end that data collection module is connected according to this group, with each number
It is polled according to the original communication agreement of feed end, obtains the data of each data feed end, and update corresponding data buffer zone；
S6：In front and back ends data collector communication subsystem, Back end data transceiver with the role of host actively, have
Obtains data to each front end data transceiver and keep in sequence；
S7：The maximum slave quantity that can be supported according to RS-485, the data collection module of Back end data transceiver divide in advance
With 247 pieces of independent data buffer zones, it is used for the temporary data obtained from front end data transceiver；
S8：Back end data transceiver initiates poll by wireless transceiver, with proprietary protocol to front end data transceiver, often
The target of secondary inquiry, not specific front-end data collector, but data feed end device id；All front end data transceivers
Inquiry frame will be received, then judges whether the ID in inquiry frame is included in its ID list, if including, just get the bid, it is preceding
End data transceiver need to respond；Otherwise, it keeps silent；
S9：The data that acknowledgement frame is stored with the data buffer zone of corresponding ID in front end data Transceiver Data collection module
Based on, ID, device type, data length, address information and valid data are packaged, Back end data transceiver, which receives, answers
It answers, the data buffer zone that data are parsed by data collection module and are updated to corresponding ID；
S10：In demand data end and Back end data transceiver communications subsystem, Back end data transceiver as slave,
Receive all inquiries from demand data end and immediate answer；
S11：Back end data transceiver receives the inquiry frame from demand data end, parse ID, register address and
Quantity information；
S12：Back end data transceiver directly reads corresponding data according to ID from the buffering area of data collection module, by phase
The original communication protocol format answered is organized into acknowledgement frame, then sends out response and gives demand data end.
It is worth noting that, attached drawing 6 is that the present invention applies one in photovoltaic plant monitoring system to have in the present embodiment
The structural schematic diagram of body embodiment.In this embodiment, main relevant device include 1 host, 1 Back end data transceiver, 200
Front end data transceiver, 160 header boxs, 40 inverters, 20 transformers, 1 illumination meter, 1 airspeedometer and 1 temperature
Meter.All there are one unique numbers for each header box, inverter, transformer, illumination meter, airspeedometer, device, i.e.,
ID in RS-485 systems.The features such as according to position distribution, by header box, inverter, transformer, illumination meter, airspeedometer, temperature
The equipment such as meter are divided into 200 groups, and each group is all connected to a front end data transceiver by RS-485 buses.Host and rear end number
It is connected by RS-485 according to transceiver.Carried out data transmission with communication between front and back ends data collector.
Illustrate the workflow of data feed end and front end data transceiver communications subsystem by taking the 1st group of equipment as an example：This
One group includes the inverter that header box, ID that ID is 1 and 2 are 161 and illumination meter and front end data transceiver that ID is 221
1。
For example, in the present embodiment, the RS-485Modbus communication protocols of certain label inverter are, it is specified that data register address
Ranging from 5000-5050 is read with function 3, and wherein register 5011 and 5012 respectively represents electric current and voltage value.According in this way
Identification feature, several inquiries for register 5011,5012,4999,5060 can be initiated with function 3.Such as when ID is equal to
161, and rational reply data is received when reading register 5011,5012, and returned when reading register 4999,5060
Mistake, so that it may determine that the data feed end device type that ID is 161 is certain label inverter.
Front end data transceiver is in normal work, by data collection module, actively, in an orderly manner to data feed end obtains
Access evidence simultaneously buffers.Data collection module supplies end equipment respectively one piece of data buffering of distribution for the data connected in this group
Area is used for the temporary data obtained.The data that each data buffer zone is stored, including ID, device type, data length,
Location information and valid data.Quantity, respective type and the ID for the data feed end that data collection module is connected according to this group,
Each data feed end of poll obtains data, and updates corresponding data buffer zone.
For this group, need to be polled 4 equipment.Data collection module is that this group of 4 pieces of equipment distribution is independent
Data buffer zone.Each inquiry-answering, according to corresponding ID and RS-485Modbus communication protocols, according to interested number
According to register, different inquiry frames is generated, RS-485 buses are sent to；The equipment of corresponding ID responds after receiving inquiry；Number
Obtain and analyze data according to collection module, update is in corresponding data buffer zone, the data collection flow of remaining each group, with the
1 group.
The workflow of front and back ends data collector communication subsystem is described as follows：
Back end data transceiver, by data collection module, actively, is in an orderly manner received to each front end data in normal work
Hair device obtains data and keeps in.The maximum slave quantity that can be supported according to RS-485, back-end data collection module are divided in advance
With 247 pieces of independent data buffer zones, it is used for the temporary data obtained from front end data transceiver.200 front end datas of this example
Transceiver itself does not have specific ID, but each ID that can all remember all data supply end equipments in this group, i.e. ID lists.
Back end data transceiver initiates poll by wireless transceiver to front end data transceiver.The target of each inquiry, and it is nonspecific
Front end data transceiver, but data feed end device id.All front end data transceivers can all receive inquiry frame, then sentence
Whether the ID in disconnected inquiry frame is included in the ID lists of oneself.If including just getting the bid, need to respond.Acknowledgement frame with
Based on the data that the data buffer zone of corresponding ID is stored in front end data Transceiver Data collection module, by ID, equipment class
Type, data length, address information and valid data are packaged.Back end data transceiver receives response, passes through data collection mould
The data buffer zone that block parses data and updates to corresponding ID.
For example, when the ID in inquiry frame is 161, front end data transceiver 1 is because of packet in its ID list { 1,2,161,221 }
It gets the bid containing 161, the data that the inverter that ID is 161 is taken out from data buffer zone generate acknowledgement frame, are sent to Back end data
Transceiver；Other front end data transceivers keep silent because not getting the bid.
The workflow of host and Back end data transceiver communications subsystem is described as follows：
Host initiates poll by RS-485 to Back end data transceiver.The target of each inquiry, is all data feed end
Device id, the mode being directly connected with host as slave such as these data supply end equipment.Back end data transceiver receives
Inquiry frame takes out the data that the data buffer zone of corresponding ID is stored, then according to relevant device class from data collection module
The RS-485Modbus communication protocols of type generate acknowledgement frame, are sent to host.
The backstage monitoring center of system is monitored in the photovoltaic plant of the embodiment of the present invention, is observed per number of units according to supply end equipment
The data update period, about 5 minutes before applying the technical scheme of the present invention, and after applying the technical scheme of the present invention
It shortens to about 1 minute.Moreover, carrying out any modification without the soft and hardware to data feed end and demand data end equipment.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Any one skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (5)
1. a kind of data collection and transmission method in distributed measurement and control system, which is characterized in that include the following steps：
S1：Increase data collection module in front and back ends data collector, in advance, actively, in an orderly manner by data collection module
Data are obtained to each data feed end and buffer, before data are asked at demand data end, just by required data collection
It completes, when the data of each data feed end are asked at pending data demand end with polling mode, Back end data transceiver is just postponed
It rushes area and takes out ready-made data, response is provided with speed as fast as possible；
S2：Between data feed end and front end data transceiver, between the data collector of front and back ends, demand data end with
Between Back end data transceiver, three relatively independent, concurrent working data communication subsystems are formed；
S3：In data feed end and front end data transceiver communications subsystem, front end data transceiver is with the role master of host
It moves, obtain data to each data feed end in an orderly manner and keep in；
S4：Front end data transceiver simultaneously remembers the data supply end equipment that this group is connected in initial phase, automatic identification
Quantity, respective type and ID, generate ID lists；
S5：Quantity, respective type and the ID for the data feed end that data collection module is connected according to this group are supplied with each data
The original communication agreement that should be held is polled, and obtains the data of each data feed end, and updates corresponding data buffer zone；
S6：In front and back ends data collector communication subsystem, Back end data transceiver with the role of host actively, in an orderly manner
Data are obtained to each front end data transceiver and are kept in；
S7：The maximum slave quantity that can be supported according to RS-485, the data collection module of Back end data transceiver allocate 247 in advance
The independent data buffer zone of block is used for the temporary data obtained from front end data transceiver；
S8：Back end data transceiver initiates poll by wireless transceiver, with proprietary protocol to front end data transceiver, asks every time
The target of inquiry, not specific front-end data collector, but data feed end device id；All front end data transceivers all can
Inquiry frame is received, then judges whether the ID in inquiry frame is included in its ID list, if including, just get the bid, front end number
It need to be responded according to transceiver；Otherwise, it keeps silent；
S9：The data that acknowledgement frame is stored using the data buffer zone of corresponding ID in front end data Transceiver Data collection module is bases
ID, device type, data length, address information and valid data are packaged by plinth, and Back end data transceiver receives response,
The data buffer zone for parsing data by data collection module and updating to corresponding ID；
S10：In demand data end and Back end data transceiver communications subsystem, Back end data transceiver receives as slave
All inquiries from demand data end and immediate answer；
S11：Back end data transceiver receives the inquiry frame from demand data end, parses ID, register address and quantity
Information；
S12：Back end data transceiver directly reads corresponding data according to ID from the buffering area of data collection module, by corresponding
Original communication protocol format is organized into acknowledgement frame, then sends out response and gives demand data end.
2. a kind of data collection and transmission method in distributed measurement and control system according to claim 1, feature exist
In in the S4, the process of automatic identification will execute one two and recirculate, outer circulation：ID is from 1 to 247, interior cycle：Each
ID attempts the communication protocol of the data feed end type of all supports.
3. a kind of data collection and transmission method in distributed measurement and control system according to claim 2, feature exist
In the processing procedure of, interior cycle be according to the feature of the communication protocol of corresponding data feed end type, in addition ID initiate one or
Several inquiry-answerings；If receiving response and in accordance with expection, so that it may to determine device type and ID, otherwise, table simultaneously
The type equipment of the ID is not present in this bright group.
4. a kind of data collection and transmission method in distributed measurement and control system according to claim 1, feature exist
In the data collection module supplies end equipment respectively one piece of data buffer zone of distribution for the data connected in this group, is used for temporary
Deposit the data of acquisition.
5. a kind of data collection and transmission method in distributed measurement and control system according to claim 4, feature exist
In, the data that each data buffer zone is stored, including ID, device type, data length, address information and valid data.
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Application publication date: 20180928 |