描述
PLC与电气回路的接口，是通过输入输出部分（I/O）完成的。I/O模块集成了PLC的I/O电路，其输入暂存器反映输入信号状态，输出点反映输出锁存器状态。输入模块将电信号变换成数字信号进入PLC系统，输出模块相反。I/O分为开关量输入（DI），开关量输出（DO），模拟量输入（AI），模拟量输出（AO）等模块。
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National Ins. 182887E-01 National Instruments At-gpib/t
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National Ins. 181830F-01 National Instruments At-gpib/t
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National Ins. 181832E-01 National Instruments At-gpib/t
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National Ins. 181830E-01 National Instruments At-gpib/t
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NI USB 6008 National Instruments
NATIONAL INSTRUMENT SCXI-1303 NSPP SCXI1303
National Instruments Model: 182009-02 GPIB / X5 Cable
NATIONAL INSTRUMENTS NI PMC-GPIB PMC GPIB
NI, NATIONAL INSTRUMENTS ISA AT-MIO-16E-10 DAQ BOARD
