CN107390625A - Plc data reading/writing method and system in a kind of coal sample detecting system - Google Patents
Plc data reading/writing method and system in a kind of coal sample detecting system Download PDFInfo
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- CN107390625A CN107390625A CN201710741622.3A CN201710741622A CN107390625A CN 107390625 A CN107390625 A CN 107390625A CN 201710741622 A CN201710741622 A CN 201710741622A CN 107390625 A CN107390625 A CN 107390625A
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- write
- read
- slave station
- data
- module
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/05—Programmable logic controllers, e.g. simulating logic interconnections of signals according to ladder diagrams or function charts
- G05B19/054—Input/output
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/10—Plc systems
- G05B2219/11—Plc I-O input output
- G05B2219/1103—Special, intelligent I-O processor, also plc can only access via processor
Abstract
The invention discloses the plc data reading/writing method in a kind of coal sample detecting system and system, method to include：S1. in main website initiating port, the MB_DB block of background data of each module is solidified；S2. according to slave station Type division address section, the MODBUS addresses of slave station are solidified；S3. in main website, according to module and the annexation of slave station, tributary address is configured；S4. the address configuration parameter in main website, is polled scanning, and operation is written and read to the data of each slave station.The present invention has the advantages that versatile, transceiving data is stable, efficiency high.
Description
Technical field
The present invention relates to the plc data in the control field of coal sample detecting system, more particularly to a kind of coal sample detecting system
Reading/writing method and system.
Background technology
In coal sample detecting system, mainly pass through PLC（Programmable controller）Implementation procedure and experiment to project
Data are received and dispatched, with realize coal sample detection it is efficient with it is accurate.In coal sample detection, including more sub-project schemes, and it is every
In sub-project scheme, automatic sample room, artificial sample preparation chamber, laboratory, the locus of storage sample room are different, therefore, it is necessary to
Having arranged PLC substations a large amount of the data for controlling and testing are received and dispatched, by taking pneumatic conveying project as an example：PLC485 slave stations
Address more than general 10, PLC configures 4 PLC485 module transceiving datas.If according to same scheme wiring, it is likely to result in
Complex circuit, Communication Jamming etc., so the mode of connection is also required to be adjusted according to specific scene.Thus cause it is each from
Station is likely to any combination and hung on any one PLC485 module port.Due to each PLC485 module initializations port
When unique ID identifiers for distributing automatically of system, while the tributary address hung is nor fixed, so existing coal sample pipe
Plc communication module in reason system needs to carry out Communication Programming adjustment according to the mode of connection of project when reading slave station signal.Tool
Body Suitable content is the interface and block of background data of MB_MASTER data transmission blocks, and for example MODBUS addresses adjust, background number
According to the renewal of block, each project needs to make substantial amounts of communication interface modification and configuration.Due to can not by it is configurable realize it is general
Version, non-senior PLC engineer are difficult in short time complete design and test.How to be configured by host computer and realize tributary address
Independent assortment, the adaptive various complicated field combinations of PLC program, each " specialized version " project alternative is adapted to general-purpose version program,
It is highly desirable.
The content of the invention
The technical problem to be solved in the present invention is that：For technical problem existing for prior art, the present invention provides one
Kind is versatile, transceiving data stabilization, plc data reading/writing method and system in the coal sample detecting system of efficiency high.
In order to solve the above technical problems, technical scheme proposed by the present invention is：A kind of plc data in coal sample detecting system
Reading/writing method, comprise the following steps：
S1. in main website initiating port, the MB_DB block of background data of each module is solidified；
S2. according to slave station Type division address section, the MODBUS addresses of slave station are solidified；
S3. in main website, according to module and the annexation of slave station, tributary address is configured；
S4. the address configuration parameter in main website, is polled scanning, and operation is written and read to the data of each slave station.
Further, for each module, the slave station quantity being attached thereto is less than or equal to 50.
Further, in step S3, the main website configures the address of slave station by fixed array.
Further, for the N number of slave station being connected with module, by the top n member of the fixed array usually configure from
Station address, and in the N+1 default end mark of element arrangements.
Further, step S4 specific steps include：
S4.1. for each module, job step variable is defined respectively；
S4.2. in the scanning of each poll, for each module, the tributary address being connected with module is assigned to successively described
Operating variable, and call read-write subprogram to perform read-write operation to the substation specified by job step variable, until completing to described
The read-write operation of slave station.
Further, in the read-write subprogram, after the read-write operation of current substation is completed, directly in the read-write
Address value in subprogram by the job step variation amplitude for individual substation once.
Further, in the read-write subprogram, substation is held by writing data enabled Variable Control read-write subprogram
Row write operates, and only when needing to write data to substation, write data enable variable and are just opened, and perform data writing operation.
A kind of plc data read-write system in coal sample detecting system, including host computer, main website and slave station, the main website bag
Multiple modules are included, the main website is connected with host computer, the module connection of the slave station and main website；The main website is in initiating port
When, solidify the MB_DB block of background data of each module；The slave station is using the MODBUS addresses solidified；The main website is according to module
With the annexation of slave station, tributary address is configured；Address configuration parameter in main website, scanning is polled, it is right
The data of each slave station are written and read operation.
Further, in the main website, for each module, job step variable is defined respectively；Scanned in each poll
In, for each module, the tributary address being connected with module is assigned to the operating variable successively, and call read-write subprogram
Read-write operation is performed to the substation specified by job step variable, until completing the read-write operation to the slave station.
Further, in the read-write subprogram, after the read-write operation of current substation is completed, directly in the read-write
Address value in subprogram by the job step variation amplitude for individual substation once.
Further, in the read-write subprogram, substation is held by writing data enabled Variable Control read-write subprogram
Row write operates, and only when needing to write data to substation, write data enable variable and are just opened, and perform data writing operation.
Further, the main website configures the address of slave station by fixed array；For be connected with module it is N number of from
Stand, tributary address is usually configured by the top n member of the fixed array, and in the default end mark of the N+1 element arrangements
Will；For each module, the slave station quantity being attached thereto is less than or equal to 50.
Compared with prior art, the advantage of the invention is that：
1st, the present invention is versatile, it is not necessary to which for different application scenarios, PLC writes control program respectively, it is only necessary in PLC
In main website, according to the annexation between each module of slave station and main website, control can easily be realized by having configured the address of slave station
Program shares.
2nd, the present invention calls read-write subprogram to be written and read the data of slave station by main website, and by way of poll
To read and write the data of each slave station successively, PLC memory consumptions have both been reduced, have increased transceiving data stability and efficiency again.
3rd, the quantity of slave station is limited to 50 by the present invention according to requirement ageing to digital independent in coal sample detecting system
It is individual following, the ageing and validity of data streams read when ensure that coal sample detection.
Brief description of the drawings
Fig. 1 is specific embodiment of the invention schematic flow sheet.
Fig. 2 is tributary address configuration schematic diagram in the specific embodiment of the invention.
Fig. 3 is specific embodiment of the invention structural representation.
Embodiment
Below in conjunction with Figure of description and specific preferred embodiment, the invention will be further described, but not therefore and
Limit the scope of the invention.
As shown in figure 1, the plc data reading/writing method in the coal sample detecting system of the present embodiment, comprises the following steps：S1.
In main website initiating port, solidify the MB_DB block of background data of each module；S2. according to slave station Type division address section,
Solidify the MODBUS addresses of slave station；S3. in main website, according to module and the annexation of slave station, tributary address is matched somebody with somebody
Put；S4. the address configuration parameter in main website, is polled scanning, and operation is written and read to the data of each slave station.
In the present embodiment, illustrated by taking the main website with 4 modules as an example, respectively module 1, module 2, module 3
With module 4, PLC carries out initiating port by MB_COMM_LOAD, solidifies MB_DB block of background data, is respectively：Module 1 is
DB101, module 2 are DB102, and module 3 is DB103, and module 4 is DB104.By solidifying MB_DB backgrounds in initiating port
Data block, when solving conventional PLC initiating ports, there is change, it is necessary to initial again in messaging parameter or block of background data
Change port parameter, and the problem of the MB_MASTER block of background data solidification of link.
In the present embodiment, in coal sample detection process, it is necessary to use a variety of different types of slave stations, and different
In application scenarios, the quantity of each type of slave station is also change.Therefore, the present embodiment according to slave station Type division address
Section, and solidify slave station MODBUS addresses, such as slave station for automatic hair terminal type, it is 90 to 99 to divide its address section,
I.e. for same application scenarios, 10 automatic slave stations for sending out terminal type can be connected.Assuming that for wherein some automatic hair eventually
The tributary address at end is cured as 99, then, for each application scenarios, the slave station that address is 99 is all corresponding to automatic hair terminal
Address, it is not necessary to again for the project of different application scene, then write program respectively for different tributary address.
In the present embodiment, in step S3, the main website configures the address of slave station by fixed array.For with module
N number of slave station of connection, tributary address is usually configured by the top n member of the fixed array, and pre- in the N+1 element arrangements
If end mark.As shown in Fig. 2 for 4 modules of main website, the fixation array that 4 length are 50 is defined respectively, is respectively
A [i], B [i], C [i], D [i], 1≤i≤50.Wherein, module 1 connects 4 slave stations, and its address is respectively 1,10,11,3, then
The address of 4 slave stations, i.e. A [1]=1, A [2]=10, A [3]=11, A [4]=3 are usually stored by array A [i] preceding 4 members.Together
When, array A [i] the 5th element is arranged to default end mark 0, i.e. A [5]=0.Similarly, for being connected with 6 slave stations
Module 2, its array be B [1]=6, B [2]=12, B [3]=4, B [4]=2, B [5]=9, B [6]=8, B [7]=0.
In the present embodiment, step S4 specific steps include：S4.1. for each module, job step change is defined respectively
Amount；S4.2. in the scanning of each poll, for each module, the tributary address being connected with module is assigned to the work successively
Make variable, and call read-write subprogram to specified by job step variable substation perform read-write operation, until complete to it is described from
The read-write operation stood.In the read-write subprogram, after the read-write operation of current substation is completed, directly in the sub- journey of read-write
Address value in sequence by the job step variation amplitude for individual substation once.In the read-write subprogram, made by writing data
Energy Variable Control read-write subprogram performs write operation to substation, only when needing to write data to substation, the enabled change of write data
Amount is just opened, and performs data writing operation.
In the present embodiment, for 4 modules of main website, it is respectively job step 1, job step 2, work to define job step variable
Make step 3 and job step 4, the workflow of 4 modules is characterized by job step variable.Illustrated by taking module 1 as an example.First
Beginning state, job step 1=0, main flow starts, by reading the value of A [1] in fixed array, because A [1] is not equal to 0, by A [1]
Value be assigned to job step 1, i.e. job step 1=1, and call read-write subprogram to read/write address be 1 slave station data read
Write, after completing the reading and writing data to the slave station, then the value of A [2] in fixed array is assigned to job step 1, calls read-write again
Subprogram to read/write address be 10 slave station data be written and read, the rest may be inferred, until complete to read/write address be 3 slave station number
According to read-write operation, that is, complete the read-write operation to the data of slave station corresponding to A [4].Because A [5] value is default end
Mark, then terminate epicycle circulation, start the scan round of next round.Main website is according to the actual connection status of slave station, by module pair
The slave station of access is polled scanning, can not only reduce PLC memory consumption, adds the stability and effect of transceiving data again
Rate.
In the present embodiment, illustrated exemplified by being the read-write of 10 slave stations to address, read and write subroutine entry parameter, work
Step 1=10, is written and read subprogram, reads the data of the slave station, and judges that writing data enables whether variable is opened, and is to say
It is bright to there are data to need to be written to the slave station, write-in of the write operation completion to the slave station data is performed, otherwise illustrates that no data need
Write, then directly skip.In the present embodiment, in subprogram is read and write, after completing to the data read-write operation of slave station,
Assignment is carried out to variable job step 1 directly inside subprogram, outlet parameter is configured, A [3] value is assigned to job step 1, work
Make 1=A of step [i+1]=11, reading and writing data is carried out as 11 slave station to be directly entered address.In the present embodiment, same slave station
Location encapsulation communication module is write, and during calling, both ensures suction parameter, and draw outlet parameter according to Command Line Parsing.Improve journey
The efficiency of sort run.
In the present embodiment, for each module, the slave station quantity being attached thereto is less than or equal to 50.Detected in coal sample
Cheng Zhong, for the reading and writing data of coal sample detection, there is the requirement in timeliness, this is related such as certain but needs to read by different slave stations
Data, it is necessary to the reading of data was completed in 1 second, otherwise can the delay of factor data cause data unavailable, influence detection knot
Fruit.And the data of main website each slave station of data successively are required to take some time, therefore, in order to ensure to read the timeliness of data
Property, the quantity of slave station is arranged to less than 50.
As shown in figure 3, the plc data read-write system in the coal sample detecting system of the present embodiment, including host computer, main website and
Slave station, the main website include multiple modules, and the main website is connected with host computer, the module connection of the slave station and main website；It is special
Sign is：The main website solidifies the MB_DB block of background data of each module in initiating port；The slave station is using solidification
MODBUS addresses；The main website configures according to module and the annexation of slave station to tributary address；Ground in main website
Location configuration parameter, scanning is polled, operation is written and read to the data of each slave station.
In the present embodiment, the main website configures the address of slave station by fixed array；It is N number of for what is be connected with module
Slave station, tributary address is usually configured by the top n member of the fixed array, and in the N+1 default end of element arrangements
Mark；For each module, the slave station quantity being attached thereto is less than or equal to 50.
In the present embodiment, in the main website, for each module, job step variable is defined respectively；In each poll
In scanning, for each module, the tributary address being connected with module is assigned to the operating variable successively, and calls read-write
Program performs read-write operation to the substation specified by job step variable, until completing the read-write operation to the slave station.Described
Read and write in subprogram, after the read-write operation of current substation is completed, directly become the job step in the read-write subprogram
Measure address value of the amplitude for individual substation once.In the read-write subprogram, the sub- journey of Variable Control read-write is enabled by writing data
Ordered pair substation performs write operation, and only when needing to write data to substation, write data enable variable and are just opened, and number is write in execution
According to operation.
Above-mentioned simply presently preferred embodiments of the present invention, not makees any formal limitation to the present invention.It is although of the invention
It is disclosed above with preferred embodiment, but it is not limited to the present invention.Therefore, it is every without departing from technical solution of the present invention
Content, according to the technology of the present invention essence to any simple modifications, equivalents, and modifications made for any of the above embodiments, it all should fall
In the range of technical solution of the present invention protection.
Claims (12)
1. the plc data reading/writing method in a kind of coal sample detecting system, it is characterised in that comprise the following steps：
S1. in main website initiating port, the MB_DB block of background data of each module is solidified；
S2. according to slave station Type division address section, the MODBUS addresses of slave station are solidified；
S3. in main website, according to module and the annexation of slave station, tributary address is configured；
S4. the address configuration parameter in main website, is polled scanning, and operation is written and read to the data of each slave station.
2. the plc data reading/writing method in coal sample detecting system according to claim 1, it is characterised in that：In step S3,
The main website configures the address of slave station by fixed array.
3. the plc data reading/writing method in coal sample detecting system according to claim 2, it is characterised in that：For with mould
N number of slave station of block connection, tributary address is usually configured by the top n member of the fixed array, and in the N+1 element arrangements
Default end mark.
4. the plc data reading/writing method in coal sample detecting system according to any one of claims 1 to 3, it is characterised in that：
Step S4 specific steps include：
S4.1. for each module, job step variable is defined respectively；
S4.2. in the scanning of each poll, for each module, the tributary address being connected with module is assigned to successively described
Operating variable, and call read-write subprogram to perform read-write operation to the substation specified by job step variable, until completing to described
The read-write operation of slave station.
5. the plc data reading/writing method in coal sample detecting system according to claim 4, it is characterised in that：In the reading
Write in subprogram, after the read-write operation of current substation is completed, directly by the job step variable in the read-write subprogram
Amplitude is the address value of individual substation.
6. the plc data reading/writing method in coal sample detecting system according to claim 5, it is characterised in that：In the reading
Write in subprogram, enable Variable Control read-write subprogram to substation execution write operation by writing data, only needing to write to substation
During data, write data enable variable and are just opened, and perform data writing operation.
7. the plc data reading/writing method in coal sample detecting system according to claim 6, it is characterised in that：For each
Module, the slave station quantity being attached thereto are less than or equal to 50.
8. the plc data read-write system in a kind of coal sample detecting system, including host computer, main website and slave station, the main website include
Multiple modules, the main website are connected with host computer, the module connection of the slave station and main website；It is characterized in that：The main website exists
During initiating port, solidify the MB_DB block of background data of each module；The slave station is using the MODBUS addresses solidified；The master
The annexation stood according to module and slave station, is configured to tributary address；Address configuration parameter in main website, enters road wheel
Scanning is ask, operation is written and read to the data of each slave station.
9. the plc data read-write system in coal sample detecting system according to claim 8, it is characterised in that：In the master
In standing, for each module, job step variable is defined respectively；, successively will be with mould for each module in the scanning of each poll
The tributary address of block connection is assigned to the operating variable, and calls read-write subprogram to hold the substation specified by job step variable
Row read-write operation, until completing the read-write operation to the slave station.
10. the plc data read-write system in coal sample detecting system according to claim 9, it is characterised in that：In the reading
Write in subprogram, after the read-write operation of current substation is completed, directly by the job step variable in the read-write subprogram
Amplitude is the address value of individual substation.
11. the plc data read-write system in coal sample detecting system according to claim 10, it is characterised in that：Described
Read and write in subprogram, enable Variable Control read-write subprogram to substation execution write operation by writing data, only needing to substation
When writing data, write data enable variable and are just opened, and perform data writing operation.
12. the plc data read-write system in coal sample detecting system according to any one of claim 8 to 11, its feature exist
In：The main website configures the address of slave station by fixed array；For the N number of slave station being connected with module, pass through the fixation
The top n member of array usually configures tributary address, and in the N+1 default end mark of element arrangements；For each module,
The slave station quantity being attached thereto is less than or equal to 50.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710741622.3A CN107390625B (en) | 2017-08-25 | 2017-08-25 | PLC data reading and writing method and system in coal sample detection system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710741622.3A CN107390625B (en) | 2017-08-25 | 2017-08-25 | PLC data reading and writing method and system in coal sample detection system |
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| CN114567672A (en) * | 2022-03-09 | 2022-05-31 | 深圳市东力科创技术有限公司 | Communication conversion device, method and storage medium |
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| CN107390625B (en) | 2020-01-21 |
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