1771-NC6
1771-NC6

一般讲，根据实际的I/O点数，凡落在上述不同范围者，选用相应的机型，性能价格比必然要高；相反，肯定要差些。

自然，也有特殊情况。如控制点数不是非常之多，不是非用大型机不可，但因大型机的特殊控制单元多，可进行热备配置，因而采用了大型机。

4.2按结构划分

PLC可分为箱体式及模块式两大类。微型机、小型机多为箱体式的，但从发展趋势看，小型机也逐渐发展成模块式的了。如OMRON公司，原来小型机都是箱体式，现在的CQM1则为模块式的。

箱体的PLC把电源、CPU、内存、I/O系统都集成在一个小箱体内。一个主机箱体就是一台完整的PLC，就可用以实现控制。控制点数不符需要，可再接扩展箱体，由主箱体及若干扩展箱体组成较大的系统，以实现对较多点数的控制。

现货，现货，降降降，火火火，火火火……

现货，现货，降降降，火火火，火火火……

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