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（3）高可靠性由于控制系统的可靠性日益受到人们的重视，一些公司已将自诊断技术、冗余技术、容错技术广泛应用到现有产品中，推出了高可靠性的冗余系统，并采用热备用或并行工作、多数表决的工作方式。S7400 PLC即使在恶劣、不稳定的工作环境下，坚固、全密封的模板依然可正常工作，在操作运行过程中模板还可热插拔。
可编程控制器（programmable logical controller，简称PLC）已经越来越多地应用于工业控制系统中，并且在自动控制系统中起着重要的作用。所以，对PLC的正确选择是重要的。
面对众多生产厂家的各种类型PLC，它们各有优缺点，能够满足用户的各种需求，但在形态、组成、功能、网络、编程等方面各不相容，没有一个统一的标准，无法进行横向比较。下面提出在自动控制系统设计中对PLC选型的一些看法，可以在挑选PLC时作为参考。
Tektronix 1103 Probe Power Supply
Tektronix - P7260 6 GHz Active Probe TekConnect Interfa
TEKTRONIX MODEL 577 CURVE TRACER 177 STANDARD FIXTURE
Tektronix AM503 Current Probe with A6303 Probe
TEKTRONIX DS 1001
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TEKTRONIX TSG 130A
TEKTRONIX ST2400 SDH/SONET SET WITH OPTION
TEKTRONIX OSCILLOSCOPE
TEKTRONIX TLA7AA4 8S LOGIC ANALYZER 136CH / 8MB DEPTH
TEKTRONIX TLA720 Logic Analyzer,Mainframe, 10 S/W Slots
NIST calibration/30-day warranty/14-day right of return
TEKTRONIX TDS220 DIGITAL OSCILLOSCOPE 2 CHANNEL TDS2CM
Tektronix 2246A Analog oscilloscope
Tektronix 11402-2D Digital Oscilloscope Mainframe. 2D-M
Tektronix DSA601A Digitizing Signal Analyzer
Tektronix S-51 Trigger Countdown Head
Tektronix TLA720 Benchtop Logic Analyzer Mainframe
Tektronix TSG300 Component TV Generator
Tektronix TLA704 Logic Analyzer Mainframe
TEKTRONIX P7240 4.0GHz Active PROBE 120 ps tr
Tektronix WFM300A/10 Component/Composite Waveform Mon.
30-day warranty/14-day right of return
Tektronix: 176 Pulsed High Current Fixture
Tektronix DAS9200 Digital Analysis Sys 92A90 w/Probes
TEKTRONIX WFM 300A WAVEFORM MONITOR & VIDEOTEK TVM-620
Tektronix PS503A Dual Power Supply Plug-In
One-day shipping available
TEKTRONIX 1503B
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TEKTRONIX 577 CURVE TRACER
TEKTRONIX SD-24 DUAL CHANNELS TDR-SAMPLING HEAD
Tektronix VM-100 Professional Video Measurement Set
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Tektronix WVR-500 Waveform Vector Rasterizer Monitor
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Tektronix TSG-300 Component Television Generator
TEKTRONIX Pulse Generator, TYP: 284, USED
Tektronix DL-11 Delay Line
TEKTRONIX MODEL 576 CURVE TRACER
Tektronix OF152 Optical TDR 1300nm multimode
Tested, 30-day warranty/14-day right of return
TEKTRONIX 7854 Oscilloscope
@@ TEKTRONIX 1503B METALLIC TDR CABLE TESTER! @@
@@@ CALIBRATED @@@ CALIBRATED @@@ CALIBRATED
Tektronix AM503B AC/DC Current Probe Amplifier
2x TEKTRONIX 1741A WAVEFORM VECTORSCOPES
Tektronix 80A01 Pre-scaled Trigger Amplifer
For Use With Tektronix CSA8000 and TDS8000, Nice Module
One-day shipping available
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TEKTRONIX PDR-100