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。
Philips/Fluke PM 5135 Function Generator PM5135
PHILIPS PM 6671 HIGH RESOLUTION TIMER /COUNTER 120MHZ
Philips LFH-388 PM388 Mini Cassette Voice Recorder
Philips PM 6612 Counter/Timer 80MHz/100ns *GOOD*
Philips PM3365-PM3367 Oscilloscope SERVICE Manual
Philips PM3365-PM3367 Oscilloscopes SERVICE Manual
Philips PM3320A-PM3323 Oscilloscope SERVICE Manual
Philips PM3315(U) Digital Oscilloscope SERVICE Manual
Philips PM2120 Univ Switch Unit
Philips PM3226 Oscilloscope 15Mhz Dual Channel Analog
Philips PM 5715 Pulse Generator 1Hz-50 MHz
