描述
I/O单元实际上是PLC与被控对象间传递输入输出信号的接口部件。I/O单元有良好的电隔离和滤波作用。接到PLC输入接口的输入器件是各种开关、按钮、传感器等。PLC的各输出控制器件往往是电磁阀、接触器、继电器，而继电器有交流和直流型，高电压型和低电压型，电压型和电流型。
ALLEN BRADLEY 1756-L1M1 NIB SEALED 1756L1M1 MFG 8/04
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ALLEN BRADLEY 5370-CVIM/C NIB 5370CVIM
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ALLEN BRADLEY 5730-CPU1 MICROVAX PROCESSOR 5730CPU1
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NEW ALLEN BRADLEY 1791IOBW I/O BLOCK 24VDC 64 POINT MOD
Allen Bradley 1747-L552 Ser C SLC 5/05 (SEALED) 09/10
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ALLEN BRADLEY 1756-L1M3 NIB SEALED 1756L1M3
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ALLEN-BRADLEY 2711-K10G8X Panelview 1000 Series B !WOW
