CN103399519B - Be applicable to the collecting method of S7 series of PLC - Google Patents
Be applicable to the collecting method of S7 series of PLC Download PDFInfo
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- CN103399519B CN103399519B CN201310308235.2A CN201310308235A CN103399519B CN 103399519 B CN103399519 B CN 103399519B CN 201310308235 A CN201310308235 A CN 201310308235A CN 103399519 B CN103399519 B CN 103399519B
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- 238000000034 method Methods 0.000 title claims abstract description 16
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- 230000008878 coupling Effects 0.000 claims abstract description 9
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- 238000005457 optimization Methods 0.000 claims description 4
- 238000012360 testing method Methods 0.000 claims description 3
- 238000005070 sampling Methods 0.000 abstract description 7
- 230000015572 biosynthetic process Effects 0.000 description 2
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Abstract
The present invention relates to the collecting method being applicable to S7 series of PLC, according to the threshold value distribution function adding up tectonic block size and read cycle, according to threshold value distribution function, dynamic division is carried out to collection capacity distribution, reduce the time existing for user configured natural block and Space Coupling degree.For improving the communication efficiency using LIBNODAVE communication interface S7 series of PLC to be carried out to data acquisition.Based on threshold statistical distribution function, realize dynamic data piecemeal, and in conjunction with multithreading; Under equal hardware configuration prerequisite, significantly can improve the picking rate of data, shorten the sampling period, improve data sampling closeness, thus improve LIBNODAVE data acquisition modes can range of application.
Description
Technical field
The present invention relates to the method for a kind of data acquisition of S7 series of PLC in industrial process control system.
Background technology
In the Application and Development of industrial system, system usually obtains from PLC device and provides necessary basic data, and data acquisition module is one of the most important and basic module.Siemens S7 series, as main flow PLC, has market very widely at home.LIBNODAVE can carry out with siemens PLC/300/400 series of PLC the free function library that communicates, be a kind of free and powerful implementation of increasing income, be a kind of feasible, design proposal that low cost, expansibility are strong, occupy an important position in for the type device data acquisition process.
Certain deficiency that LIBNODAVE also exists, it reads data volume (block size) and spent time nonlinear relationship, owing to being be based upon on TCP communications protocol, inner realization encapsulates too much details, especially when the variable natural data block (when being in threshold value critical point as sparse distribution, monoblock) lack of standardization of the communication configuration on PLC, conventional natural block order reading efficiency reduces, and the sampling period of data, hundred milliseconds of ranks, causes the market demand that collects range limited.Under the prerequisite of peer communications data volume, how to optimize block structure, effectively reduction collection period and become the problem that will solve in collecting method.
Summary of the invention
The object of this invention is to provide a kind of optimized data collection algorithm being applicable to S7 series of PLC, the non-linear uncontrollability that the lack of standard eliminated or reduce nature block brings, from in block, interblock two aspects significantly improve acquisition speed, reduce the sampling period, improve data sampling closeness.
Object of the present invention is achieved through the following technical solutions:
Be applicable to the collecting method of S7 series of PLC, according to the threshold value distribution function adding up tectonic block size and read cycle, according to threshold value distribution function, dynamic division is carried out to collection capacity distribution, reduce the time existing for user configured natural block and Space Coupling degree;
First, added up by test data, construct the structure threshold value distribution function existed between the communication block size l of communications protocol bag LIBNODAVE and cycle T, find that it exists trapezoidal profile rule:
L=450B (bit)
T=10ms (millisecond)
L is data block length
Then, based on concrete collection capacity distribution situation, according to threshold value distribution function dynamic creation piecemeal, gather according to piecemeal in gatherer process, according to threshold value critical point, an excessive natural block comminute is become multiple pieces, adopt multithreading to read optimization block respectively.
Further, the above-mentioned collecting method being applicable to S7 series of PLC, adopts multithreading to create a collecting thread for each acquisition units block.
Further, the above-mentioned collecting method being applicable to S7 series of PLC, each data block creates separately a worker thread, and each thread maintains the link of a PLC, sets up multi-wad join.
The substantive distinguishing features that technical solution of the present invention is outstanding and significant progress are mainly reflected in:
For the threshold value ladder regularity of distribution existed between the communication block size l of communications protocol bag LIBNODAVE and cycle T, adopt the segmentation in conjunction with threshold value distribution function dynamic creation image data block, read in conjunction with multithreading is parallel, eliminate or reduce the time existing for natural block and the spatial order degree of coupling of user's setting, improve the data acquisition efficiency adopting LIBNODAVE to carry out by a relatively large margin, shorten collection period, reduce the gap with hardware interface acquisition means further, make the range of application of acquisition system more wide, or even in the contour frequency acquisition application of error diagnosis in industrial rolling process, to improving, acquisition system efficiency is significant.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, technical solution of the present invention is described further:
Fig. 1: the dynamic division collecting flowchart schematic diagram adopting threshold statistical.
Embodiment
Adopt open communication interface LIBNODAVE, the threshold value distribution function adopting Corpus--based Method to generate, the optimized algorithm adopting deblocking, in conjunction with multithreading, eliminate or reduce the spatio-temporal degree of coupling of nature block, reduce nonlinear uncontrollability; By a relatively large margin improve data acquisition efficiency; For reducing the sampling period, improving data sampling closeness, expand data acquisition further and have important practical significance in the application in the fields such as malfunction elimination diagnosis.
Unit due to data acquisition is data block, according to threshold value distribution function dynamic creation piecemeal, concentrates the data of scattered distribution according to threshold value critical point, improves collecting efficiency in block.According to threshold value critical point, an excessive natural block comminute is become multiple pieces, avoid because the return period that monolithic leap critical point brings significantly increases, multithreading is adopted to read optimization block respectively, eliminate its temporal order coupling, eliminate or reduce and avoid the unreasonable distribution of threshold value critical point place, effectively improve the efficiency that interblock gathers.
For SIEMENS PLC S7-400, as shown in Figure 1, LIBNODAVE Version2 is adopted, collection interface function daveReadManyBytes; Construct the threshold value distribution function existed between the communication block size l of communications protocol interface LIBNODAVE and cycle T;
L=450B (bit)
T=10ms (millisecond)
L is data block length
This threshold value distribution function is the foundation of dynamic division.
(1) by user configured PLC collection capacity nature block distribution synthesis optimizing, as there is discrete date distribution in one section of DB block;
| Block number | Block bias internal | Data type |
| DB322 | DBD0 | Int |
| DB322 | DBD4 | Int |
| DB322 | DBD12 | Float |
| DB322 | DBD16 | Float |
| DB322 | DBD24 | Int |
| DB322 | DBD28 | Int |
| DB322 | DBD36 | Float |
| DB322 | DBD48 | Int |
| DB322 | DBD52 | Int |
| DB322 | DBD396 | Int |
According to threshold value distribution function, this natural block owing to being formed at PLC end must be collected, and order reads in a conventional manner else if, and its collection period is more than 60ms, and it is then 10ms that optimum synthesis reads in a data block.
(2) because the unit of data acquisition is data block, if distributed according to natural data block such as DB322, even if these variablees are full Coutinuous store in block, as 800B.
| Block number | Block bias internal | Data type |
| DB322 | DBD0 | Int |
| DB322 | DBD4 | Int |
| …….. | …….. | …….. |
| DB322 | DBD396 | Int |
| DB322 | DBD400 | Float |
| DB322 | DBD404 | Int |
| …….. | …….. | …….. |
| DB322 | DBD796 | Int |
According to the threshold value regularity of distribution, its return period is the shortest is 20ms.If according to threshold value distribution function dynamic creation piecemeal, a natural block comminute is become two blocks, multithreading is adopted to read respectively, eliminate its temporal order coupling, the read cycle of each piece is about below 12ms, within therefore its collection period is controlled in 15ms, gathers in gatherer process according to this piecemeal, eliminate or reduce and avoid the unreasonable distribution of threshold value critical point place, effectively improve the efficiency gathered in block.
Comprehensive above algorithm, adopt the segmentation in conjunction with threshold value distribution function dynamic creation image data block, data nature block is divided or synthesize optimization block, this block distributes and meets the threshold value ladder regularity of distribution existed between the communication block size l of LIBNODAVE and cycle T, read in conjunction with multithreading is parallel, eliminate or reduce the time existing for natural block and the spatial order degree of coupling of user's setting, improve data acquisition efficiency by a relatively large margin, shorten collection period.
Adopt multithreading, for each acquisition units block creates a collecting thread, eliminate or reduce the time coupling between data, thus improving interblock collecting efficiency, more remarkable for the situation improved efficiency that there is multiple stage data source simultaneously in addition.According to the dynamic piecemeal result of threshold function table, improve the data read-write efficiency in block, for improving the acquisition efficiency between data block further, for each data block creates separately a worker thread, degree time correlation brought sequentially is read in elimination, each thread maintains the link of a PLC, ensure the independence between data block, test proves, sets up multi-wad join, for the situation that polylith exists, the reading speed of multithreading is obviously better than the efficiency of single-threaded order block reading.
Below be only embody rule example of the present invention, protection scope of the present invention is not constituted any limitation.The technical scheme that all employing equivalents or equivalence are replaced and formed, all drops within rights protection scope of the present invention.
Claims (3)
1. be applicable to the collecting method of S7 series of PLC, it is characterized in that: come the size of tectonic block and the threshold value distribution function of read cycle according to statistics, according to threshold value distribution function, dynamic division is carried out to collection capacity distribution, reduce the time existing for user configured natural block and Space Coupling degree;
First, added up by test data, construct the threshold value distribution function existed between the communication block size l of communications protocol bag LIBNODAVE and cycle T, find that it exists trapezoidal profile rule:
L=450B (bit)
T=10ms (millisecond)
L is data block length
Then, based on concrete collection capacity distribution situation, according to threshold value distribution function dynamic creation piecemeal, gather according to piecemeal in gatherer process, according to threshold value critical point, an excessive natural block comminute is become multiple pieces, adopt multithreading to read optimization block respectively.
2. the collecting method being applicable to S7 series of PLC according to claim 1, is characterized in that: adopt multithreading to create a collecting thread for each acquisition units block.
3. the collecting method being applicable to S7 series of PLC according to claim 1, is characterized in that: each data block creates separately a worker thread, and each thread maintains the link of a PLC, sets up multi-wad join.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2228698A1 (en) * | 2005-03-14 | 2010-09-15 | Omron Co., Ltd. | Programmable controller system |
| CN102929189A (en) * | 2012-10-16 | 2013-02-13 | 西安迅腾科技有限责任公司 | Household gas using quality real-time data acquisition prompting method |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2228698A1 (en) * | 2005-03-14 | 2010-09-15 | Omron Co., Ltd. | Programmable controller system |
| CN102929189A (en) * | 2012-10-16 | 2013-02-13 | 西安迅腾科技有限责任公司 | Household gas using quality real-time data acquisition prompting method |
Non-Patent Citations (2)
| Title |
|---|
| 油喷雾阀监测装置的开发与设计;吴道虎，李兴华;《电子设计应用》;20030331(第3期);34-37 * |
| 造纸企业自动数据采集系统的设计与实现;龙飞;《中国优秀硕士学位论文全文数据库》;20081231;I138-79 * |
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Effective date of registration: 20171011 Address after: 471000 Henan Province, Luoyang city high tech Development Zone middle Ling Road Patentee after: China Nonferrous Metals Processing Technology Co., Ltd. Address before: Suzhou City, Jiangsu Province, Shen Hu Road Park 215021 No. 200 Patentee before: Suzhou Non-ferrous Metal academy Co., Ltd. |