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 45C-98B NSFP 45C98B
RELIANCE ELECTRIC 1SC4000 NSFP 1SC4000
RELIANCE ELECTRIC 78177-1W NSFP 781771W
RELIANCE ELECTRIC 0-57408-1 NSPP 0574081
RELIANCE ELECTRIC 61C-515 NSPP 61C515
RELIANCE ELECTRIC 0-57408-D NSPP 057408D
RELIANCE ELECTRIC 0-57408-1B NSPP 0574081B
RELIANCE ELECTRIC 0-60031-1 USPP 0600311
RELIANCE ELECTRIC 0-60031-4 USPP 0600314
RELIANCE ELECTRIC 0-60031-5 USPP 0600315A
Reliance 0-51890-6 PC Board DPSG
Reliance 25 HP 3515 RPM 3 Phase Motor NEW SURPLUS
