描述
组成PLC的模块是PLC的硬件基础，只有弄清所选用的PLC都具有那些模块及其特点，才能正确选用模块，去组成一台完整的PLC，以满足控制系统对PLC的要求CPU模块，它是PLC的硬件核心。PLC的主要性能，如速度、规模都由它的性能来体现。
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