PLC的问题是没有人发现真正的问题所在。根据近期的市场调研，大多数工程师仍然认为数字技术提供了节省空间的机会。而数字芯片在PLC模块中仅占据15%至20%的电路板空间。真正的问题在于模拟和分立元件占据绝大多数的PCB空间。这些器件在PLC模块中占据高达85%的电路板空间。而这些器件不像数字芯片那样具备大规模集成，所以需要更高集成度来节省PCB空间。
3．输入/输出单元
罗克韦尔、施耐德、西门子在大型PLC市场依然三分天下；中型PLC市场西门子仍然一枝独秀；大中型PLC的市场格局未曾改变，但是需要注意一些潜在力量。
所有数片机的参数和运转情况，都将通过监控系统??台达人机界面来巡检其工作状况。包括气缸动作时间、自动数片系统的正常与否都将一目了然。
热继电器过载信号的处理
系统管理程序主要控制PLC的运行，使PLC按正确的次序工作；用户指令解释程序将PLC的用户指令转换为机器语言指令，传输到CPU内执行；功能程序与系统程序调用则负责调用不同的功能子程序及其管理程序。
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GE CIMPLICITY PLANT EDITION HMI VERSION 6.0 44A736970-001R20
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COOPER AUTOMATION * NUTRUNNER * 3VA/3B180A/3K1M
PP214 Siemens Sitor 6QN4200-6AD von 6QG2532-3GN10
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