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。
Parker PR400SHV Pressure Reducing Valve
NOS! PARKER REMOTE PRESSURE AIR VALVE CWJ12501
NEW Parker Hydraulic Filter 932630Q High Pressure
Parker D39DW11C4N89 75, PRESSURE REGULATION VALVE , NEW
PARKER VERIFLO IR400S4PG PRESSURE REDUCING REGULATOR
NOS! PARKER REMOTE PRESSURE VALVE CC1225B
LOT PARKER VERIFLO PRESSURE TRANSDUCER SWITCH DWYER
Parker Oil Pressure Regulator Control Valve A4AL; *A7
Parker high pressure clamp flange elbow 41775-16-16
Parker 41575 16-16 Clamp SAE flange high pressure 1 in
