描述
PLC有两种基本的工作模式，即运行(RUN)模式与停止(STOP)模式。在运行模式，PLC通过反复执行反映控制要求的用户程序来实现控制功能。为了使PLC的输出及时地响应随时可能变化的输入信号，用户程序不是只执行一次，而是不断地重复执行，直至PLC停机或切换到STOP工作模式。
TEK TDS3054B Digital Phospore Oscilloscope w/ P6139A X4
Tektronix AFG3252 Arbitrary/Function Generator w/ cal
Tektronix AFG3252 Arbitrary Waveform Generator 0-240MHz
Calibrated, 30-day warranty/14-day right of return
Tektronix TMS818 Probe Adapter Bus Support PCI Express
Tektronix AWG610 Arbitrary Waveform Generator w/opt.10
Tektronix TDS7104 1GHz Options 3M J1 J2 Tested Working
Tektronix PQA300 Picture Quality Analysis System
TEKTRONIX TLA715 LOGIC ANALYZER + TLA7E2 + TLA7AA4 / ES
Tektronix TDS3054 Digital Phosphor Oscilloscope 4CH 5GS
Tektronix WFM5000 SD/HD-SDI Waveform Monitor NEW
TEKTRONIX TDS7104/1M Oscilloscope, 1 GHz 4 Ch 10 GS/s
