PLC控制电梯的设计【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最新发展趋势长期以来,PLC始终处于工业自动化控制领域的主战场,为各种各样的自动化控制设备提供了非常可靠的控制应用。其主要原因,在于它能够为自动化控制应用提供安全可靠和比较完善的解决方案,适合于当前工业企业对自动化的需要。另一方面,PLC还必须依靠其他新技术来面对市场份额逐渐缩小所带来的冲击,尤其是工业PC所带来的冲击。PLC需要解决的问题依然是新技术的采用、系统开放性和价格。PLC技术发展的最终趋势仍然是人们所争论的焦点之一。大多数人认为,PLC将会继续失去市场份额;更有甚者认为,在工业PC面前,PLC将会一步一步走向死亡;但也有一部分人相信,一些特殊工业应用领域仍将为PLC提供一定的市场份额。在全球工业计算机控制领域,围绕开放与再开放过程控制系统、开放式过程控制软件、开放性数据通信协议,已经发生巨大变革,几乎到处都有PLC,但这种趋势也许不会继续发展下去。随着软PLC(SoftPLC)控制组态软件技术的诞生与进一步完善和发展,安装有SoftPLC组态软件和基于工业PC过程控制系统的市场份额正在逐步得到增长,这些事实使传统PLC供应商在思想上已经发生了戏剧性的变化,他们必须面对现实,在传统PLC的技术发展与提高方面作出更加开放的高姿态。对于控制软件来讲,这是PLC控制器的核心,PLC供应商正在向工业用户提供开放式的编程组态工具软件,而且对于工业用户表现得非常积极。此外,开放式通信网络技术也得到了突破,其结果是将PLC融入更加开放的工业控制行业。PLC制造商已经开始注视基于工业PC控制技术所带来的强大冲击。有专家甚至认为,新商务活动所带来的新技术和开放技术规范将会埋葬传统PLC。PLC制造商认为,虽然在工业现场安装有大量的PLC控制设备,但他们仍然需要联合工控软件公司,以便开发他们自己的基于工业PC的过程控制软件。诚然,几年前在工业现场明显存在着新旧PLC混合使用的情况,工业用户不得不同时学习相关的新旧知识,甚至彼此借鉴学习。大多数PLC制造商为工业用户仅仅提供了软逻辑和一种操作平台。在高端应用方面,很难进一步区分PLC控制系统和工业PC控制系统之间的差异,因为这两者均采用了同样类型的微处理器和内存芯片。形象地打个比喻,如果你忘掉工业PC和PLC这些词语字面上的含义,那么在箱子里所能够观察到的恰恰是一些基本计算机硬件技术,我们更多观察到的却是那些基本技术的复杂化和混合体,这些技术被有效地组合到控制系统中去。另外,采用开放控制的原因一方面是系统功能集成的需要,另一方面也是由于一些工业用户对功能过分苛求所致。如果能够给予高度的重视,就能够获得更多的基本技术知识。PLC制造商专注于系统功能化,而工业用户则专注于系统应用。人们可以看到,将来的发展趋势是将更多的功能进一步集成到一个控制箱内。因而像顺序控制和过程控制这样的事件将会采用功能化方式进行处理,其他像运动控制等也能够共享到相同的控制结构体系中。可以相信,PLC技术将继续向开放式控制系统方向转移,尤其是基于工业PC的控制系统。后者除了在灵活性方面比传统PLC具有截然不同的优势外,还具有其他优点,如能够缩短系统投放到市场的周期,降低系统投资费用,提高从工厂底层到企业办公自动化的数据信息流动效率等。关于工业PC控制系统的实时响应问题已经得到很好的解决,也许其主要的东西仍然隐藏在技术背后,但缺乏相应的跟踪记录。对于PLC来讲,坚固性是其主要特点之一,这已经有相当多的跟踪记录来验证。工业用户仍然非常小心地对待PLC,他们正在对PLC作不同的技术测试工作。在利用一种新技术时,工业用户需要考虑的问题是要冒多大的风险,同时需要考虑对其商务活动能够带来多少机会和收益。但工业用户不完全相信开放式控制系统所带来的好处。随着技术的进一步发展,他们开始逐渐淡化这些思想观念。工业用户正在平衡采用新技术所存在的风险和给他们的商务活动所带来的收益,以便为今后的决策提供有效的保障。
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