PLC机型选择的基本原则是:在功能满足要求的前提下,选择zui可靠、维护使用zui方便以及性能价格比*的机型。通常做法是,在工艺过程比较固定、环境条件较好的场合,建议选用整体式结构的PLC;其他情况则选用模块式结构的 PLC;对于开关量控制以及以开关量控制为主、带少量模拟量控制的工程项目中,一般其控制速度无须考虑,因此,选用带 A/D转换、D/A转换、加减运算、数据传送功能的低档机就能满足要求;而在控制比较复杂,控制功能要求比较高的工程项目中(如要实现PID运算、闭环控制、通信联网等),可视控制规模及复杂程度来选用中档或高档机(其中高档机主要用于大规模过程控制、全PLC的分布式控制系统以及整个工厂的自动化等)。根据不同的应用对象,表1列出了PLC的几种功能选择。
IC200ALG263
The analog input module GE Versamax IC200ALG263 is a 15 bit voltage 15 channel single ended that is one group. The GE Versamax is capable of 250vac continuous: 1500vac for 1 minute. The GE Versamax has software-configurable selections of default/hold last state.
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