IC693CPU341  
IC693CPU341  
 

控制规模还与输入、输出电路数有关。如控制规模为1024点，那就得有1024条I/O电路。这些电路集成于I/O模块中，而每个模块有多少路的I/O点总是有数的。所以，规模大，所使用的模块也多。

控制规模还与PLC指令系统有关。规模大的PLC指令条数多，指令的功能也强，才能应付对点数多的系统进行控制的需要。

控制规模是对PLC其它性能指标起着制约作用的指标；也是PLC划分为微、小、中、大和特大型

5.3组成模块

PLC的结构虽有箱体及模块式之分，但从质上看，箱体也是模块，只是它集成了更多的功能。在此，不妨把PLC的模块组成当作所有PLC的结构性能。

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