IC693PCM301RR 模块式PLC将PLC的各组成部分分别做成若干个单独的模块，如CPU模块、I/O模块、电源模块（有的含在CPU模块中）以及各种功能模块。模块式PLC由框架或基板和各种模块组成，模块装在框架或基板的插座上，如图所示。这种模块式PLC的特点是配置灵活，可根据需要选配不同规模的系统，而且装配方便，便于扩展和维修。大、中型PLC一般采用模块式结构。
IC693PCM301RR还有一些PLC将整体式和模块式的特点结合起来，构成所谓的叠装式PLC。叠装式PLC的CPU、电源、I/O接口等也是各自独立的模块，但它们之间是靠电缆进行连接的，并且各模块可以一层层地叠装。这样，不但系统可以灵活配置，还可做得体积小巧。
2.按功能分类
根据PLC的功能不同，可将PLC分为低档、中档、三类。
（1）低档PLC
低档PLC具有逻辑运算、定时、计数、移位以及自诊断、监控等基本功能，还可有少量模拟量输入/输出、算术运算、数据传送和比较及通信等功能，主要用于逻辑控制、顺序控制或少量模拟量控制的单机控制系统。
（2）中档PLC
中档PLC除具有低档PLC的功能外，还具有较强的模拟量输入/输出、算术运算、数据传送和比较、数制转换、远程I/O、子程序及通信联网等功能；有些还可增设中断控制、PID控制等功能，适用于复杂的控制系统。
IC693PCM301RR
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