描述
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三菱plc是日系品牌，编程直观易懂，学习起来会比较轻松，但指令较多。而西门子plc是德国品牌，指令比较抽象，学习难度较大，但指令较少，所以学习三菱和学习西门子的周期是一样的。
个人认为三菱(日系的中高端品牌)PLC的软件至少落后西门子5年以上，大中型的暂且不说，就拿三菱比较有优势的小型机FX系列和西门子S7-200系列相比，西门子有如下优势：
三菱的编程软件从早期的FXGPWIN到近期的GX8.0(我所知道最新的)，和所有的日系品牌一样，该软件的编程思路是自上而下的单一纵向结构，而西门子的MicroWIN则是纵向和横向兼备的结构，而且子程序支持局部变量，相同的功能只需要编一次程序即可，大大减少了开发难度和时间。S7-200一直以来支持强大的浮点运算，编程软件直接支持小数点输入输出，而三菱直至近年推出的FX3U系列才有此种功能，以前的FX2N系列的浮点功能都是假的。S7-200的模拟量输入输出程序非常简单方便，AD、DA值可以不需编程直接存取的，三菱的FX2N及其以前的系列都需要非常繁琐的FROMTO指令。FX3U如今倒支持此功能了，但足足晚了五年甚至更多。
当然三菱的FX2N系列也有它自己的优势，一是高速计数器指令比S7-200方便，二是422口比西门子的PPI口皮实（因为200系列的PPI口是非光电隔离的，非规范操作和仿制的编程电缆可能会导致串口损坏）。
以上的比较仅仅是小型机，至于西门子的300和400系列以及更大型的TDC系列，这里就无需多言了。 学PLC，三菱是很容易上手的，因为直来直去思路简单，但从学习的角度讲，肯定是西门子更好。
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品牌：ABB ,AB ,GE,FOXBORO,本特利，英维思，伍德沃德，西屋，瑞恩，施耐德，西门子，摩托罗拉，安川。力士乐。ACSO，横河等进口品牌。 专业销售进口DCS PLC系统备件模块
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