描述
CPU作为整个PLC的核心，起着总指挥的作用。CPU一般由控制电路、运算器和寄存器组成。这些电路通常都被封装在一个集成电路的芯片上。CPU通过地址总线、数据总线、控制总线与存储单元、输入输出接口电路连接。CPU的功能有以下一些：从存储器中读取指令，执行指令，取下一条指令，处理中断。
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Allen Bradley 1745-R1 Relay Board Processor Unit *NIB*
NS** ALLEN-BRADLEY 1745-E153 SLC 150 EXPANSION UNIT
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Allen-Bradley 1745-PT1 with cable
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Allen-Bradley SLC100 Replacement Relay Board 1745-R1 !!
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Allen Bradley 1745-PT1 Series A
ALLEN BRADLEY 1745-R2 SLC100 REPLACEMENT RELAY BOARD
