机械专业英文文献下载更多的PAC技术论文和视频教程.docx

1、机械专业英文文献下载更多的PAC技术论文和视频教程Downloading more PAC technical paper andvideo frequency courseHas produced along with many merchants can unify the PC function and the PLC reliable programmable automation controller (PAC), at present the control system gradually started to use PAC. This white paper introduc

2、ed PAC the origin as well as it with PLC and the PC difference, and had pointed out will use PAC the industry to control the future development direction.Table of contents PAC will become the future the industry control mode 80-20 principle Constructs a better controller Two kind of different softwa

3、res solution PAC vision and survey application PAC has avoided to the special hardware need LabVIEW uses in the automated controlNI PAC systemPAC will become the future the industry control mode with compares based on the PC control system, related PLC (programmable logical controller) the superiori

4、ty and the inferiority intense argument has already continued for ten years. Because PC and PLC are more and more small in the technical difference, and has used the commercialization along with PLC (COTS) the hardware as well as PC can use the real-time operating system, thus appeared one kind of n

5、ew form controller - PAC. The PAC concept is (ARC) proposes by the automation development facility, it expressed the programmable automated controller, used in describing unified PLC and the PC function new generation of industry controller. The traditional PLC merchant uses PAC the concept to descr

6、ibe their high end system, but PC control merchant then uses for to describe their industrialization to control the platform.80-20 principle In PLC in 30 years which developed, it passes through develops unceasingly, already could unify simulates I/O, the network corresponds as well as uses new prog

7、ramming standard like IEC 61131-3. However, engineers only must use digital I/O and few simulations I/O number as well as simple programming skill on potential 80% industrial application. Comes from ARC, the unit exploitation company (VDC) as well as on the net PLC training resources PLC. The net ex

8、pert estimated that, 77% PLC uses in the small application (being lower than 128 I/O) 72% PLC I/O is a numeral 80% PLC application may use 20 trapezoidal logical sets of instructions to solveBecause uses traditional the tool to be possible to solve 80% industrial application, like this intensely nee

9、ds to have low cost simple PLC; Thus promoted the low cost miniature PLC growth, it has the useful trapezoidal logical programming digital I/O. However, this has also created the discontinuity in the control technology, on the one hand 80% application need to use the simple low cost controller, but

10、on the other hand other 20% application then have surpassed the function which the tradition control system can provide. Engineer is developing these 20% application to need to have the higher circulation speed, the senior control algorithm, the more simulations function as well as can well and the

11、enterprise network integration.In 80 and the 90s, these must develop 20% application engineers had considered uses PC in the industry control. PC provides the software function may carry out the senior task, provides the rich programming and the user environment, and the PC COTS part enables control

12、 engineer the technology which develops unceasingly to use in other applications. These technologies including floating point processor; High speed I/O main line, like PCI and ethernet; Fixed data memory; software development kit. Moreover PC also can provide the incomparable flexibility, highly eff

13、ective software as well as senior low cost hardware.However, PC is not extremely suitablly uses in controlling the application. Although many engineers in integrated senior function time uses PC, these functions including simulation control and simulation, connection database, network function nf as

14、 well as with third party equipment correspondence, but PLC still was at the dominant position in the control domain. Is standard PC is not but designs based on the PC control main question for the strict industry environment.PC mainly faces three major problems: Stability: The usual PC general oper

15、ating system cannot provide uses in controlling the enough stability. The installment can force the processing system collapse based on the PC control equipment and not expect to again opens. Reliability: Because PC has the magnetic hard disk and the non- reliable part which revolves, like the power

16、 source, this makes it to be easier to appear the breakdown. Not familiar programming environment: The factory operator needs to have when maintains and fixes the breakdown restores the system the ability. The use trapezoidal logic, they may manual force the coil to restore to the perfect condition,

17、 and can fast patch the code which affects by is fast restored the system. However, the PC system needs the operator to study the new higher paraffin the tool.Although certain engineers use have the firm hardware and the specially operating system special-purpose industry computer, but because Engin

18、eer PC reliable aspect question overwhelming majority avoids in the control using PC. In addition, uses in each kind of automated duty equipment in PC, like I/O, correspondence, or movement possible need different development environment.Therefore these must develop 20% application engineers either

19、use PLC to be unable with ease to realize the function which the system needs, either uses both contains PLC and to contain PC the mix system, they use PLC to carry out the code control section, realizes the higher paraffin function with PC. Thus the present many factories workshops use the system w

20、hich PLC and PC unifies, in use system PC carries on the data record, the connection bar code scanner, inserts the information in the database as well as issues the data to the net on. Uses this way establishment system the main question is this system with difficulty constructs frequently, fixes th

21、e breakdown and the maintenance. System engineer must unify frequently comes from many merchants software and hardware work to puzzle, this is because these equipment are not but design for can the joint operation.Constructs a better controller Because does not have suitable PC or the PLC solution,

22、these need development complex application engineer on develops the new product with the control merchant close cooperation. They need the new product to be able to unify PC the senior software function and the PLC reliability. These important users were PLC and have provided the product development

23、 instruction based on the PC control company.Realizes the software function not only to need to have the senior the software, moreover the controller hardware function also needs to have the enhancement. Because in the world scope is dropping to the PC part demand, therefore many semiconductors merc

24、hants start for the industrial application redesign their product. At present controls the domain the merchant to start in the industry control product to use the industrialization floating point processor, DRAM, solid state memory like Compact Flash as well as the fast Ethernet chip. This enables t

25、he merchant to use based on the PC control system flexibility and the usability develops a more formidable software, moreover this PC control system also may move the real-time operating system by to guarantee the reliability.This kind of new controller is the solution 20% the application question b

26、ut designs, it unified PLC and the PC two merits. The ARC industry analyst is called this kind of equipment the programmable automated controller, namely PAC. The programmable logical controller world looks at in generally the research in ARC, they have produced the PAC five principal characteristic

27、s. These controller characteristics are through define the software the ability to realize its function. Multi-purpose, has in the logic, the movement, the PID control, the actuation and processing in a platform at least two kind of above functions. Except that in order to realize special agreement

28、like SERCOS to have to I/O makes some improvements; Moreover the software also can provide logical, the movement, processing and the PID function. For example, the movement control took the software control circulation, it can reading the digital input from the orthogonal encoder, the execution simu

29、lation control circulates and outputs the control device the simulated signal. The sole multi- regulations develop the platform use general label and the sole database visit all parameters and the function. Because PAC is like multi-purpose but designs for more the senior application, they need the

30、senior software. In order to can highly effective design the system, the software must be the sole integrated software package, but is not the many kinds of separations software tool, these software tools in the project cannot the seamless joint operation. Through unifies IEC61131-3, the user guide

31、and the data management, the software tool can design is surmounting many machines and the processing unit processing flow. The simplification system design on the other hand is has the senior the development kit, uses this tool to be possible to cause engineer very with ease to transform the proces

32、sing concept for can actual control the machine the code. The opening modular skeleton can solve the industrial application may distribute from the control in the factory machine to processes workshop the operation unit. Because all industrial application all needs to have highly has custom-made the

33、 characteristic, therefore the hardware must be the modulation in order to engineers may choose the appropriate part. Moreover, the software also must be able to let engineer increase and the demolition module by the system which designs needs. Uses already the network interface standard which has, the la