CN112711218B - Industrial equipment data acquisition method - Google Patents
Industrial equipment data acquisition method Download PDFInfo
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- CN112711218B CN112711218B CN202011424973.XA CN202011424973A CN112711218B CN 112711218 B CN112711218 B CN 112711218B CN 202011424973 A CN202011424973 A CN 202011424973A CN 112711218 B CN112711218 B CN 112711218B
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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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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/26—Special purpose or proprietary protocols or architectures
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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
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Abstract
The invention provides a method for acquiring data of industrial equipment, which comprises the following steps: step S1: determining a communication protocol used by industrial equipment PLC of which data needs to be acquired; step S2: partitioning the addresses of the equipment parameters to be acquired according to a storage area; step S3: setting a merging distance of the equipment parameters, judging whether the equipment parameters can be merged and collected according to the set merging distance, and dividing the equipment parameters which can be merged and collected into different collection blocks; step S4: determining the initial address and the reading length of each acquisition block, constructing a request frame and sending the request frame to the equipment PLC; step S5: receiving a response frame, and taking out a matched data result from the response frame according to the address and the data type of the equipment parameter; step S6: and sequentially traversing and reading the acquisition blocks of the partitions to obtain all the equipment data to be acquired. The invention directly constructs the communication frame according to the communication protocol of various industrial equipment PLC, does not depend on additional third-party protocol library software, and has stronger controllability and flexibility.
Description
Technical Field
The invention relates to the technical field of computers, in particular to a method for acquiring data of industrial equipment.
Background
In recent years, with the rapid development of industrial internet, it has become an important means for promoting the progress of manufacturing industry. The access of industrial equipment is the foundation of the combination of an industrial internet platform and an actual production manufacturing process, wherein the most critical is the data acquisition of the equipment.
A PLC (programmable logic controller) is a digital arithmetic operation electronic system designed specifically for application in an industrial environment. A large number of industrial plants are controlled by PLCs, which store a large amount of plant parameter data.
In general, the data acquisition of industrial equipment needs to screen parameters and select valuable important parameters for acquisition, so that the parameters to be acquired are discretely distributed in a storage space of a PLC. If each parameter is collected independently, the PLC is required to be frequently communicated, the collection efficiency is low, the working load of the PLC is increased, and the normal operation of the PLC is influenced. The existing batch reading method has an effect only when the address distribution to be read is continuous, or only specific PLC types, communication protocols and network interfaces are supported, or additional third-party protocol library software is required, so that the requirements of applications such as industrial internet, edge calculation and the like on the performance and the universality of data acquisition cannot be met.
Therefore, how to improve the performance and the universality of the data acquisition method, improve the data acquisition efficiency of the industrial equipment, and reduce the influence of the data acquisition on the normal operation of the equipment PLC is a technical problem to be solved by technical personnel in the field.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides the method for acquiring the data of the industrial equipment, which can directly construct a communication frame according to the communication protocol of various industrial equipment PLC, does not depend on additional third-party protocol library software, and has stronger controllability and flexibility; the efficiency of industrial equipment data acquisition is improved, and the influence of data acquisition on the normal operation of the PLC is reduced.
In order to solve the technical problems in the prior art, the technical scheme of the invention is as follows:
a method of industrial equipment data acquisition, comprising the steps of:
step S1: determining a communication protocol used by industrial equipment PLC of which data needs to be acquired;
step S2: partitioning the addresses of the equipment parameters to be acquired according to a storage area;
step S3: setting a merging distance of the equipment parameters, judging whether the equipment parameters can be merged and collected according to the set merging distance, and dividing the equipment parameters which can be merged and collected into different collection blocks;
step S4: determining the initial address and the reading length of each acquisition block, constructing a request frame and sending the request frame to the equipment PLC;
step S5: receiving a response frame, and taking out a matched data result from the response frame according to the address and the data type of the equipment parameter;
step S6: and sequentially traversing and reading the acquisition blocks of the partitions to obtain all the equipment data to be acquired.
As a further improvement, step S3 further includes:
calculating a merging interval of each address according to the merging distance and the byte address in the equipment parameter address;
sequentially traversing all the addresses, and judging whether the merging intervals are overlapped;
if the merging intervals of the two addresses are not overlapped, continuously traversing;
if the merging intervals of the two addresses are overlapped, the two equipment parameters can divide the two addresses into the same acquisition block through the same request frame for merging acquisition, and the merging interval of the acquisition block is expanded into a collection of the merging intervals of the two addresses;
traversing the residual addresses in sequence, judging whether the residual addresses are overlapped with the merging interval of the acquisition block, and finishing the division of the acquisition block;
repeating the overlapping judgment process on the rest addresses, and dividing all the combinable collected addresses into different collection blocks;
and if the merging interval of a certain address is not overlapped with the merging intervals of all other addresses, the address is regarded as an independent acquisition block for acquisition.
As a further improvement scheme, a merging interval [ Pinf, Psup ] obtained by adding and subtracting a merging distance Dist to each address Paddr is calculated,
if the Paddr minus the merging distance Dist is less than or equal to 0, Pinf is the base address of the storage area;
if Paddr plus the merge distance Dist is greater than or equal to the maximum length supported by the PLC protocol, Psup is the maximum length supported by the PLC protocol.
As a further improvement, determining a start address and a read length of each acquisition block, wherein the start address is the smallest address in the acquisition blocks; the reading length is the difference value between the maximum address and the minimum address in the acquisition block, and the data type length of the device parameter corresponding to the maximum address is added.
As a further improvement, the calculation of the read length includes:
and if the calculation result exceeds the maximum frame length supported by the PLC protocol, continuously partitioning the acquisition block.
As a further improvement, in step S5, the extracting the matched data from the response frame includes:
calculating the offset position of the data result in the response frame according to the address of the equipment parameter and the initial address of the request;
calculating the number of bytes required to be read according to the data type of the equipment parameter;
reading a corresponding data result through the offset position and the number of bytes;
and displaying the data result into a correct format according to the data type of the equipment parameter.
As a further improvement, in step S6, sequentially traversing and reading the partitions includes:
if the serial port acquisition equipment PLC is used, all the request frames are sent in series, and only the response frame corresponding to the current frame returns or the next request frame is sent after the timeout time is reached;
if the network acquisition equipment PLC is used, but only one Socket connection is allowed, the processing mode is the same as the serial port acquisition;
and if the network acquisition equipment PLC is used and a plurality of Socket connections are allowed, all the request frames are sent in parallel.
As a further refinement, the device parameter merge distance is set to 16, 32, 64, 128 or 256.
As a further improvement, the device parameters at least include addresses and data types of the device parameters;
the address of the device parameter at least comprises a storage area identifier, a byte address and a bit address;
the data types include at least one of the following: BIT, INT8, UINT8, INT16, UINT16, INT32, UINT32, BCD16, BCD32, BIN16, BIN32, HEX16, HEX32, FLOAT, DOUBLE, STRING.
As a further improvement, the setting of the merging distance may not exceed the maximum frame length supported by the PLC protocol.
Compared with the prior art, the method and the device have the advantages that the parameter addresses distributed in the storage space of the PLC in a scattered manner are divided into the same acquisition block as much as possible, the number of times of communication with the PLC during data acquisition is greatly reduced, the data acquisition efficiency of industrial equipment is improved, and the influence of the data acquisition on the normal operation of the equipment PLC is also reduced. Meanwhile, the invention directly constructs communication frames according to the communication protocols of various industrial equipment PLC, does not depend on additional third-party protocol library software, and has stronger controllability and flexibility.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of an industrial equipment data acquisition system according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of a data acquisition method for an industrial device according to an embodiment of the present invention;
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic structural diagram of an industrial device data acquisition system according to an embodiment of the present invention. As shown in fig. 1, the system provided by the present embodiment includes a data acquisition apparatus 101, a PLC communication protocol 102, and an acquired device PLC 103. The data acquisition device can be an edge computing gateway and the like; the PLC communication protocol is determined by the PLC type, and the physical interface is usually a serial port or a network. The data acquisition device 101 can communicate with at least one acquired device PLC 103, and the present scheme does not particularly limit the data acquisition device 101, the PLC communication protocol 102, and the acquired device PLC 103.
Generally, when data of industrial equipment is collected, a collected device PLC is connected to a data collection device in a serial port or network mode. Information such as the PLC type of the equipment, the parameters of the equipment to be acquired and the like can also be configured to the data acquisition device. And the data acquisition device is communicated with the equipment PLC according to the configured information and acquires the data result of the equipment parameters.
Fig. 2 is a schematic flow chart of a data acquisition method for industrial equipment according to an embodiment of the present invention, and an execution subject of the embodiment is the data acquisition device in the embodiment shown in fig. 1. As shown in fig. 2, the method includes:
and step S1, determining the communication protocol used by the industrial equipment PLC of which the data needs to be collected.
The industrial equipment PLC which needs to acquire data comprises a plurality of PLCs of different types, and the corresponding communication protocols can be different; the data acquisition device needs to support the communication protocol used. As shown in figure 1, three different brands of PLCs are connected with a data acquisition device through serial ports, and are respectively connected with different serial ports of the data acquisition device, the data acquisition device can parallelly acquire data of the PLCs, and the data acquisition process of each PLC is independent and independent.
The PLC communication protocol is generally a proprietary protocol of each PLC manufacturer, and the communication protocol adopted during communication depends on the PLC type, for example, a FINS protocol is generally used for communication with ohm dragon PLC, and a PPI protocol is generally used for communication with Siemens S7-200 PLC. And part of the PLCs support data acquisition through standard communication protocols such as Modbus and the like, and can be selected according to the condition of the PLC of the equipment.
And step S2, partitioning the addresses of the device parameters to be collected according to the storage areas.
The parameters to be collected are distributed in the memory space of the PLC discretely, and the addresses are also arranged in a disordered way, as shown in Table 1.
For addresses of different storage areas, the corresponding frame types in the PLC communication protocol are different, so that equipment parameters need to be collected in a partitioning manner;
wherein the role of the data type includes:
the data types correspond to different byte lengths and are used for calculating the reading length of the acquisition group; a representation method representing the result data for displaying the result data in a correct format.
| Serial number | PLC address | Data type |
| 1 | C2 | INT16 |
| 2 | C305 | UINT16 |
| 3 | I12.4 | BIT |
| 4 | I2.0 | BIT |
| 5 | I131.7 | BIT |
| 6 | M0.0 | BIT |
| 7 | M33 | INT8 |
| 8 | M12 | UINT8 |
| 9 | M104 | INT16 |
| 10 | M526 | UINT16 |
| 11 | M418 | INT32 |
| 12 | M422 | UINT32 |
| 13 | M116 | FLOAT |
| 14 | M31.7 | BIT |
| 15 | Q0.0 | BIT |
| 16 | Q21.3 | BIT |
| 17 | SM0 | INT8 |
| 18 | SM1 | UINT8 |
| 19 | SM100 | INT16 |
| 20 | T0 | INT16 |
| 21 | T255 | UINT16 |
| 22 | V3.3 | BIT |
| 23 | V221 | INT8 |
| 24 | V702 | UINT8 |
| 25 | V100 | INT16 |
| 26 | V344 | UINT16 |
| 27 | V580 | INT32 |
| 28 | V466 | UINT32 |
| 29 | V1206 | FLOAT |
| 30 | V8191.7 | BIT |
TABLE 1
And step S3, setting the merging distance of the equipment parameters, judging whether the equipment parameters can be merged and collected according to the set merging distance, and dividing the equipment parameters which can be merged and collected into different collection blocks.
Calculating a merging interval [ Pinf, Psup ] obtained by adding and subtracting the merging distance Dist to each address Paddr according to the byte address in the merging distance equipment parameter address; the equipment parameter merging distance is generally set to be equal to 16, 32, 64, 128 and 256 values according to experience, and can be adjusted and optimized according to the specific conditions of the acquisition efficiency to obtain a value which enables the acquisition efficiency to be the highest; if the set merging distance is 128, the merging interval of the addresses is a closed interval of 257 continuous addresses with the address as the center;
sequentially traversing all the addresses, and judging whether the merging intervals are overlapped;
if the merging intervals of any two addresses are not overlapped, continuously traversing;
if the merging intervals of any two addresses are overlapped, the two equipment parameters can be merged and collected through the same request frame, the two addresses can be divided into the same collection block, and the merging interval of the collection block is expanded into a collection of the merging intervals of the two addresses; for example, address I12.4 and address I2.0 of the I memory area are divided into the same acquisition block, and the range of the merge section is also expanded.
Traversing the residual addresses in sequence, judging whether the residual addresses are overlapped with the merging interval of the acquisition block, and finishing the division of the acquisition block; for example, if the address I131.7 of the I memory area overlaps with the merge section of the aforementioned acquisition block, the acquisition block is merged into the acquisition block, and the acquisition block division of the I memory area is completed.
Repeating the overlapping judgment process on the rest addresses, and dividing all the combinable collected addresses into different collection blocks; the acquisition blocks of the M memory area, for example, include two acquisition blocks M0-M116, M418-M526.
And if the merging interval of a certain address is not overlapped with the merging intervals of all other addresses, the address is regarded as an independent acquisition block for acquisition. E.g., the two addresses C2 and C305 of the C storage area, cannot be divided into the same acquisition block and are acquired as two separate acquisition blocks.
Step S4, determining the initial address and the reading length of each acquisition block, constructing a request frame and sending the request frame to the equipment PLC; for example, the acquisition blocks of the M storage areas are respectively:
start address M0, read length 220 bytes;
a start address M418, read length 110 bytes;
if the maximum frame length supported by the PLC protocol is 512, the acquisition blocks V3-V580 of the V storage area need to be continuously partitioned into two blocks V3-V466 and V580.
And step S5, receiving the response frame, and taking out the matched data result from the response frame according to the address and the data type of the equipment parameter.
Calculating the offset position of the data result in the response frame according to the address of the equipment parameter and the initial address of the request;
calculating the number of bytes required to be read according to the data type of the equipment parameter;
reading a corresponding data result through the offset position and the number of bytes;
and displaying the data result into a correct format according to the data type of the equipment parameter.
And step S6, sequentially reading the acquisition blocks of the partitions in a traversing manner to obtain all the equipment data to be acquired.
For example, the data result value for C2 is 22, the data result value for I12.4 is 1, and the data result value for V580 is 21845.
The method provided by the invention is suitable for simultaneously acquiring multiple industrial equipment PLCs of different types in a serial port or network mode, can greatly reduce the times of communication with the PLCs during data acquisition, improves the efficiency of data acquisition of the industrial equipment, and also reduces the influence of the data acquisition on the normal operation of the equipment PLCs. Meanwhile, the invention directly constructs communication frames according to the communication protocols of various industrial equipment PLC, does not depend on additional third-party protocol library software, and has stronger controllability and flexibility.
In the embodiments provided by the present invention, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described device embodiments are merely illustrative, and for example, the division of the modules is only one logical division, and other divisions may be realized in practice, for example, a plurality of modules may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or modules, and may be in an electrical, mechanical or other form.
The modules described as separate parts may or may not be physically separate, and parts displayed as modules may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
In addition, functional modules in the embodiments of the present invention may be integrated into one processing unit, or each module may exist alone physically, or two or more modules are integrated into one unit. The unit formed by the modules can be realized in a hardware form, and can also be realized in a form of hardware and a software functional unit.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (8)
1. A method of industrial equipment data acquisition, comprising the steps of:
step S1: determining a communication protocol used by industrial equipment PLC of which data needs to be acquired;
step S2: partitioning the addresses of the equipment parameters to be acquired according to a storage area;
step S3: setting a merging distance of the equipment parameters, judging whether the equipment parameters can be merged and collected according to the set merging distance, and dividing the equipment parameters which can be merged and collected into different collection blocks;
step S4: determining the initial address and the reading length of each acquisition block, constructing a request frame and sending the request frame to the equipment PLC;
step S5: receiving a response frame, and taking out a matched data result from the response frame according to the address and the data type of the equipment parameter;
step S6: sequentially traversing and reading each acquisition block of each partition to obtain all equipment data to be acquired;
wherein, step S3 includes:
calculating a merging interval of each address according to the merging distance and the byte address in the equipment parameter address;
sequentially traversing all the addresses, and judging whether the merging intervals are overlapped;
if the merging intervals of the two addresses are not overlapped, continuously traversing;
if the merging intervals of the two addresses are overlapped, merging and acquiring the two equipment parameters through the same request frame, dividing the two addresses into the same acquisition block, and expanding the merging interval of the acquisition block into a union set of the merging intervals of the two addresses;
traversing the residual addresses in sequence, judging whether the residual addresses are overlapped with the merging interval of the acquisition block, and finishing the division of the acquisition block;
repeating the overlapping judgment process on the rest addresses, and dividing all the combinable collected addresses into different collection blocks;
if the merging interval of a certain address is not overlapped with the merging intervals of all other addresses, the address is regarded as an independent acquisition block for acquisition;
calculating a merging interval [ Pinf, Psup ] obtained by adding and subtracting the merging distance Dist to each address Paddr,
if the Paddr minus the merging distance Dist is less than or equal to 0, Pinf is the base address of the storage area;
if Paddr plus the merge distance Dist is greater than or equal to the maximum length supported by the PLC protocol, Psup is the maximum length supported by the PLC protocol.
2. The method of industrial equipment data acquisition according to claim 1, characterized by determining a start address and a read length of each acquisition block, wherein the start address is the smallest address in the acquisition block; the reading length is the difference value between the maximum address and the minimum address in the acquisition block, and the data type length of the device parameter corresponding to the maximum address is added.
3. The method of industrial equipment data acquisition of claim 2, wherein the calculation of the read length comprises:
and if the calculation result exceeds the maximum frame length supported by the PLC protocol, continuously partitioning the acquisition block.
4. The method for data collection of industrial equipment according to claim 2, wherein in the step S5, the retrieving the matched data result from the response frame includes:
calculating the offset position of the data result in the response frame according to the address of the equipment parameter and the initial address of the request;
calculating the number of bytes required to be read according to the data type of the equipment parameter;
reading a corresponding data result through the offset position and the number of bytes;
and displaying the data result into a correct format according to the data type of the equipment parameter.
5. The method for data collection of industrial equipment according to claim 2, wherein in step S6, sequentially traversing and reading each partition comprises:
if the serial port acquisition equipment PLC is used, all the request frames are sent in series, and only the response frame corresponding to the current frame returns or the next request frame is sent after the timeout time is reached;
if the network acquisition equipment PLC is used, but only one Socket connection is allowed, the processing mode is the same as the serial port acquisition;
and if the network acquisition equipment PLC is used and a plurality of Socket connections are allowed, all the request frames are sent in parallel.
6. The method of industrial equipment data collection of claim 2,
the device parameter merge distance is set to 16, 32, 64, 128 or 256.
7. The method of claim 2, wherein the device parameters include at least an address and a data type of the device parameter;
the address of the device parameter at least comprises a storage area identifier, a byte address and a bit address;
the data types include at least one of the following: BIT, INT8, UINT8, INT16, UINT16, INT32, UINT32, BCD16, BCD32, BIN16, BIN32, HEX16, HEX32, FLOAT, DOUBLE, STRING.
8. The method of claim 2, wherein the merge distance is not set to exceed a maximum frame length supported by a PLC protocol.
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