PLC控制電梯的設(shè)計(jì)【三菱】
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The latest development trend of PLC
long period of time, PLC has always been in the field of industrial automation control of the main battlefield for a wide range of automation control equipment to provide a very reliable control applications. The main reason is that it is able to control the application of automation to provide a safe, reliable and fairly complete solutions for industrial enterprises in the current automation needs. On the other hand, PLC must also rely on other new technology to face diminishing market share of the impact, especially in the industrial impact of PC. PLC is still the need to address the issue of the use of new technologies, system openness and price.
PLC technology is still the ultimate trend is one of the bone of contention. Most people think, PLC will continue to lose market share; What is more the view that in the industrial PC before, PLC will be step by step toward death; but there are also some people believe that some special industrial applications for the PLC will continue to provide some market share.
Computer control in the global industrial areas, around the opening and re-open process control system, open the process control software, an open data communication protocol, enormous changes have taken place almost everywhere, PLC, but this trend may not continue to develop. With the soft PLC (SoftPLC) control configuration software technology and to further improve the birth and development of installed software and configuration SoftPLC industrial PC-based process control system market share is gradually growth, these facts so that the traditional thinking of PLC suppliers have been dramatic changes have taken place, they must face the reality, in the traditional PLC technology development and improve to make a more open high-profile. The control software, this is the core of PLC Controller, PLC vendors are provided to industrial users of open software programming tool configuration, but also for industrial users was very positive. In addition, open communication network technology has been a breakthrough, and the result is more open to the PLC into the industrial control industry.
PLC manufacturers have begun to monitor the industrial PC-based control technology brought about by the impact of the powerful. Some experts even believe that the new business brought about by new technologies and open technical specifications will be buried the traditional PLC. PLC manufacturers believe that, although a large number of industrial-site installation of PLC controlled equipment, but they still need to joint industrial control software company, in order to develop their own PC-based industrial process control software.
It is true that a few years ago in the industrial field there is a clear mix of the old and the new PLC, the industrial users have to learn at the same time the old and the new knowledge-related, even learn from each other. The majority of PLC manufacturers for industrial users only provides a logical and a soft platform.
In the high-end applications, it is difficult to further distinguish between PLC control system and industrial PC control system for the difference between, which both used the same types of microprocessors and memory chips. Image to make an analogy, if you forget the industrial PC and PLC literal meaning of these terms, then in the box that can be observed that it is precisely the number of basic computer hardware technology, we further observed that the basic technology is the complexity of and a combination of these technologies are effective combinations to the control system.
In addition, the reasons for an open control system functions on the one hand, the need for integrated, on the other hand, as well as some industrial users to function caused by too much. If we can give a high degree of importance, will be able to gain more knowledge of basic skills. PLC manufacturers to focus on system functionality, while industrial users will focus on the system. People can see that the future trend is that more features will be further integrated into a control box. Thus, as the order of control and process control events such functional approach will be adopted to deal with other things like motion control, etc. can also be shared to the same system of control structures.
It is believed that, PLC technology will continue to open the direction of the transfer of control systems, especially PC-based industrial control systems. In addition to the flexibility of the latter than the traditional PLC with a distinct advantage, also has other advantages, such as to shorten the system to market cycles, lower system investment costs, improve the bottom from the factory to the corporate office automation efficiency of data flow of information and so on.
Industrial PC control system on a real-time response has been very good solution, perhaps the main thing is still hidden behind the technology, but the lack of track record. For PLC, the firm is one of its main features, this is already a considerable number of track record to verify. Industrial users will still be very careful to treat PLC, they are on the PLC for testing different technologies. In the use of a new technology, the industrial users need to consider the question is how much risk to take, at the same time need to consider how much business and revenue opportunities.
However, industrial users do not fully believe in an open control system benefits. With the further development of technology, they began to play down these ideas. Industrial users to adopt new technologies is balanced by the risks and business activities to their benefit, so the decision-making for the future to provide effective protection.
Industrial PC technology offers many features that can enhance the functional properties of the PLC, including the embedded digital video and high-speed floating-point coprocessor. Although Microsoft did not further improve the functional properties of the plan, the new Windows CE 3.0 is fully
PLC最新發(fā)展趨勢(shì)
長(zhǎng)期以來(lái),PLC始終處于工業(yè)自動(dòng)化控制領(lǐng)域的主戰(zhàn)場(chǎng),為各種各樣的自動(dòng)化控制設(shè)備提供了非??煽康目刂茟?yīng)用。其主要原因,在于它能夠?yàn)樽詣?dòng)化控制應(yīng)用提供安全可靠和比較完善的解決方案,適合于當(dāng)前工業(yè)企業(yè)對(duì)自動(dòng)化的需要。另一方面,PLC還必須依靠其他新技術(shù)來(lái)面對(duì)市場(chǎng)份額逐漸縮小所帶來(lái)的沖擊,尤其是工業(yè)PC所帶來(lái)的沖擊。PLC需要解決的問(wèn)題依然是新技術(shù)的采用、系統(tǒng)開(kāi)放性和價(jià)格。
PLC技術(shù)發(fā)展的最終趨勢(shì)仍然是人們所爭(zhēng)論的焦點(diǎn)之一。大多數(shù)人認(rèn)為,PLC將會(huì)繼續(xù)失去市場(chǎng)份額;更有甚者認(rèn)為,在工業(yè)PC面前,PLC將會(huì)一步一步走向死亡;但也有一部分人相信,一些特殊工業(yè)應(yīng)用領(lǐng)域仍將為PLC提供一定的市場(chǎng)份額。
在全球工業(yè)計(jì)算機(jī)控制領(lǐng)域,圍繞開(kāi)放與再開(kāi)放過(guò)程控制系統(tǒng)、開(kāi)放式過(guò)程控制軟件、開(kāi)放性數(shù)據(jù)通信協(xié)議,已經(jīng)發(fā)生巨大變革,幾乎到處都有PLC,但這種趨勢(shì)也許不會(huì)繼續(xù)發(fā)展下去。隨著軟PLC(SoftPLC)控制組態(tài)軟件技術(shù)的誕生與進(jìn)一步完善和發(fā)展,安裝有SoftPLC組態(tài)軟件和基于工業(yè)PC過(guò)程控制系統(tǒng)的市場(chǎng)份額正在逐步得到增長(zhǎng),這些事實(shí)使傳統(tǒng)PLC供應(yīng)商在思想上已經(jīng)發(fā)生了戲劇性的變化,他們必須面對(duì)現(xiàn)實(shí),在傳統(tǒng)PLC的技術(shù)發(fā)展與提高方面作出更加開(kāi)放的高姿態(tài)。對(duì)于控制軟件來(lái)講,這是PLC控制器的核心,PLC供應(yīng)商正在向工業(yè)用戶(hù)提供開(kāi)放式的編程組態(tài)工具軟件,而且對(duì)于工業(yè)用戶(hù)表現(xiàn)得非常積極。此外,開(kāi)放式通信網(wǎng)絡(luò)技術(shù)也得到了突破,其結(jié)果是將PLC融入更加開(kāi)放的工業(yè)控制行業(yè)。
PLC制造商已經(jīng)開(kāi)始注視基于工業(yè)PC控制技術(shù)所帶來(lái)的強(qiáng)大沖擊。有專(zhuān)家甚至認(rèn)為,新商務(wù)活動(dòng)所帶來(lái)的新技術(shù)和開(kāi)放技術(shù)規(guī)范將會(huì)埋葬傳統(tǒng)PLC。PLC制造商認(rèn)為,雖然在工業(yè)現(xiàn)場(chǎng)安裝有大量的PLC控制設(shè)備,但他們?nèi)匀恍枰?lián)合工控軟件公司,以便開(kāi)發(fā)他們自己的基于工業(yè)PC的過(guò)程控制軟件。
誠(chéng)然,幾年前在工業(yè)現(xiàn)場(chǎng)明顯存在著新舊PLC混合使用的情況,工業(yè)用戶(hù)不得不同時(shí)學(xué)習(xí)相關(guān)的新舊知識(shí),甚至彼此借鑒學(xué)習(xí)。大多數(shù)PLC制造商為工業(yè)用戶(hù)僅僅提供了軟邏輯和一種操作平臺(tái)。
在高端應(yīng)用方面,很難進(jìn)一步區(qū)分PLC控制系統(tǒng)和工業(yè)PC控制系統(tǒng)之間的差異,因?yàn)檫@兩者均采用了同樣類(lèi)型的微處理器和內(nèi)存芯片。形象地打個(gè)比喻,如果你忘掉工業(yè)PC和PLC這些詞語(yǔ)字面上的含義,那么在箱子里所能夠觀察到的恰恰是一些基本計(jì)算機(jī)硬件技術(shù),我們更多觀察到的卻是那些基本技術(shù)的復(fù)雜化和混合體,這些技術(shù)被有效地組合到控制系統(tǒng)中去。
另外,采用開(kāi)放控制的原因一方面是系統(tǒng)功能集成的需要,另一方面也是由于一些工業(yè)用戶(hù)對(duì)功能過(guò)分苛求所致。如果能夠給予高度的重視,就能夠獲得更多的基本技術(shù)知識(shí)。PLC制造商專(zhuān)注于系統(tǒng)功能化,而工業(yè)用戶(hù)則專(zhuān)注于系統(tǒng)應(yīng)用。人們可以看到,將來(lái)的發(fā)展趨勢(shì)是將更多的功能進(jìn)一步集成到一個(gè)控制箱內(nèi)。因而像順序控制和過(guò)程控制這樣的事件將會(huì)采用功能化方式進(jìn)行處理,其他像運(yùn)動(dòng)控制等也能夠共享到相同的控制結(jié)構(gòu)體系中。
可以相信,PLC技術(shù)將繼續(xù)向開(kāi)放式控制系統(tǒng)方向轉(zhuǎn)移,尤其是基于工業(yè)PC的控制系統(tǒng)。后者除了在靈活性方面比傳統(tǒng)PLC具有截然不同的優(yōu)勢(shì)外,還具有其他優(yōu)點(diǎn),如能夠縮短系統(tǒng)投放到市場(chǎng)的周期,降低系統(tǒng)投資費(fèi)用,提高從工廠(chǎng)底層到企業(yè)辦公自動(dòng)化的數(shù)據(jù)信息流動(dòng)效率等。
關(guān)于工業(yè)PC控制系統(tǒng)的實(shí)時(shí)響應(yīng)問(wèn)題已經(jīng)得到很好的解決,也許其主要的東西仍然隱藏在技術(shù)背后,但缺乏相應(yīng)的跟蹤記錄。對(duì)于PLC來(lái)講,堅(jiān)固性是其主要特點(diǎn)之一,這已經(jīng)有相當(dāng)多的跟蹤記錄來(lái)驗(yàn)證。工業(yè)用戶(hù)仍然非常小心地對(duì)待PLC,他們正在對(duì)PLC作不同的技術(shù)測(cè)試工作。在利用一種新技術(shù)時(shí),工業(yè)用戶(hù)需要考慮的問(wèn)題是要冒多大的風(fēng)險(xiǎn),同時(shí)需要考慮對(duì)其商務(wù)活動(dòng)能夠帶來(lái)多少機(jī)會(huì)和收益。
但工業(yè)用戶(hù)不完全相信開(kāi)放式控制系統(tǒng)所帶來(lái)的好處。隨著技術(shù)的進(jìn)一步發(fā)展,他們開(kāi)始逐漸淡化這些思想觀念。工業(yè)用戶(hù)正在平衡采用新技術(shù)所存在的風(fēng)險(xiǎn)和給他們的商務(wù)活動(dòng)所帶來(lái)的收益,以便為今后的決策提供有效的保障。
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