欧姆龙的PLC+变频器的组合如果用于泵的顺序控制器,在3个泵组成的系统中控制水压。PLC+变频器的组合对个泵进行连续的闭环控制,另外两个连在平行水管上的泵进行开/关控制。人机界面(MMI)可以进行监控,无线传输可将SMS信号传送至维护人员。
在美国,市场战略有时甚至比技术本身更让人瞩目,2003年行业内有一个广为流行新词汇:可编程自动化控制器(Programmable Automation Controller,PAC)。
这个崭新的词汇源自于ARC咨询集团市场调查公司的Craig Resnick,他认为,”PLC相当活跃,而且发展良好,具很强的生命力。然而,PLC这个工业的有效工具正在许多方面不断改变,不断增加其魅力。自动化供应商正不断致力于PLC的开发,以迎合市场和特殊用户的需求。功能的增强促使了新系列的系统浮出水面。PAC基于开放的工业标准、具多领域功能、通用的开放平台以及高性能。ARC生造了这个词,以帮助用户定义应用需要,帮助制造商在谈到其产品时能更清晰。
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