PLC 的基本单元由哪几个部分组成?各起什么作用?

<p style="margin-top:16px;margin-right:0;margin-bottom:16px;margin-left:0;text-indent:0;padding:0 0 0 0 ;background:rgb(255,255,255)"><br/></p><p style="margin-top:16px;margin-right:0;margin-bottom:16px;margin-left:0;text-indent:0;padding:0 0 0 0 ;background:rgb(255,255,255)"><strong><span style="font-family: 微软雅黑;color: rgb(34, 34, 34);letter-spacing: 1px;font-size: 16px"><span style="font-family:微软雅黑">（</span><span style="font-family:微软雅黑">1）&nbsp;CPU&nbsp;:</span></span></strong><span style="font-family: 微软雅黑;color: rgb(34, 34, 34);letter-spacing: 1px;font-size: 16px">PLC 的核心部件,指挥 PLC 进行各种工作。如接受用户程序和数 据、诊断、执行执行程序等;</span></p><p style="margin-top:16px;margin-right:0;margin-bottom:16px;margin-left:0;text-indent:0;padding:0 0 0 0 ;background:rgb(255,255,255)"><strong><span style="font-family: 微软雅黑;color: rgb(34, 34, 34);letter-spacing: 1px;font-size: 16px"><span style="font-family:微软雅黑">（</span><span style="font-family:微软雅黑">2）</span></span></strong><span style="font-family: 微软雅黑;color: rgb(34, 34, 34);letter-spacing: 1px;font-size: 16px"><span style="font-family:微软雅黑">存储器</span><span style="font-family:微软雅黑">:存储系统和用户的程序和数据;</span></span></p><p style="margin-top:16px;margin-right:0;margin-bottom:16px;margin-left:0;text-indent:0;padding:0 0 0 0 ;background:rgb(255,255,255)"><strong><span style="font-family: 微软雅黑;color: rgb(34, 34, 34);letter-spacing: 1px;font-size: 16px"><span style="font-family:微软雅黑">（</span><span style="font-family:微软雅黑">3）&nbsp;I&nbsp;/&nbsp;O接口:</span></span></strong><span style="font-family: 微软雅黑;color: rgb(34, 34, 34);letter-spacing: 1px;font-size: 16px">PLC 与工业生产现场被控对象之间的连接部件,用来接受被控设 备的信号和输出程序的执行结果;</span></p><p style="margin-top:16px;margin-right:0;margin-bottom:16px;margin-left:0;text-indent:0;padding:0 0 0 0 ;background:rgb(255,255,255)"><strong><span style="font-family: 微软雅黑;color: rgb(34, 34, 34);letter-spacing: 1px;font-size: 16px"><span style="font-family:微软雅黑">（</span><span style="font-family:微软雅黑">4）通信接口:</span></span></strong><span style="font-family: 微软雅黑;color: rgb(34, 34, 34);letter-spacing: 1px;font-size: 16px"><span style="font-family:微软雅黑">通过通信接口与监视器、打印机等其他设备进行信息交换</span><span style="font-family:微软雅黑">;</span></span></p><p style="margin-top:16px;margin-right:0;margin-bottom:16px;margin-left:0;text-indent:0;padding:0 0 0 0 ;background:rgb(255,255,255)"><strong><span style="font-family: 微软雅黑;color: rgb(34, 34, 34);letter-spacing: 1px;font-size: 16px"><span style="font-family:微软雅黑">（</span><span style="font-family:微软雅黑">5）电源。</span></span></strong></p><p><br/></p>