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。
TEKTRONIX 2754P SPECTRUM ANALYZER 10 kHz to 21 GHz USED
TEKTRONIX 1765 Component Waveform / Vector Monitor NTSC
TEKTRONIX AWG2021 Arbitrary Waveform Generator 250 MHz
Tektronix TDS 754C 500 MHz 2 GS/s Oscilloscope
Tektronix TDS 520A TDS520A scope, NIST-calibrated
additional free NIST recalibration within one year
Tektronix TDS 420A TDS420A scope, NIST-calibrated
additional free NIST recalibration within one year
Tektronix TVS625 VXI Waveform Analyzer *warranty*
TEKTRONIX 7612D PROGRAMMABLE DIGITIZER
Tektronix 2430A Digital Oscilloscope + 2402A Tekmate+++
Tektronix TDS 520B TDS520B digital scope, NISTcertified
