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。
RELIANCE ELECTRIC P25G6903 NSPP P25G6903
RELIANCE ELECTRIC 86466-60R USPP 8646660R
RELIANCE ELECTRIC 5V4151 USPP 5V4151
RELIANCE ELECTRIC 0-48680-111 NSPP 048680111
RELIANCE ELECTRIC 0-49001-5 NSFP 0490015
RELIANCE 6SP401-022CTAN A-C DRIVE SP600 ***NNB***
RELIANCE ELECTRIC 0-49026-9 NSPP 0490269
RELIANCE ELECTRIC 0-51862-1 NSFP 0518621
RELIANCE ELECTRIC 0-51865-15 USPP 05186515
RELIANCE ELECTRIC 0-54339-11 USPP 05433911
RELIANCE ELECTRIC 54339-11 USPP 5433911
RELIANCE ELECTRIC 831654 NSPP 831654
