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PLC具有通用性强、使用方便、适应面广、可靠性高、抗干扰能力强、编程简单等特点。可以预料：在工业控制领域中，PLC控制技术的应用必将形成世界潮流
PLC程序既有生产厂家的系统程序，又有用户自己开发的应用程序，系统程序提供运行平台，同时，还为PLC程序可靠运行及信息与信息转换进行必要的公共处理。用户程序由用户按控制要求设计。
一般讲，PLC分为箱体式和模块式两种。但它们的组成是相同的，对箱体式PLC，有一块板、I/O板、显示面板、内存块、电源等，当然按性能分成若干型号，并按I/O点数又有若干规格。对模块式PLC，有模块、I/O模块、内存、电源模块、底板或机架。无任哪种结构类型的PLC，都属于总线式开放型结构，其I/O能力可按用户需要进行扩展与组合。PLC的基本结构框图如下：
Tektronix VX4286 32-Channel Analog/Digital Input Module
One-day shipping available
Tektronix P6217 Active Fet Probe
TEKTRONIX 2432 300 MHz DIGITAL STORAGE OSCILLOSCOPE!
@@@ CALIBRATED @@@ CALIBRATED @@@ CALIBRATED @@@
2465DMS OSCILLOSCOPE TEKTRONIX
TEKTRONIX 2465 DMS OSCILLOSCOPE
Tektronix 1410 Video Generator NTSC
Tektronix TAS485 200 MHz Oscilloscope-w/calibration
Tektronix THS710 Digital Oscilloscope
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Tektronix 764 Audio + WFM601E Serial Component Monitor
Tektronix 2465A DM 350MHz Oscilloscope 4 Channels DMM
Expedited shipping available
Tektronix TM 503 Power Module PG501-PG505 Tek TM503 GUR
Tektronix P6022 Current Probe + Termination 6022 TESTED
TEKTRONIX TLA 7N4 LOGIC ANALYZER OPTION 6S 136 CHANNEL
Tektronix 2430 Dual Trace Digital Oscilloscope 150MHz
Expedited shipping available
TEKTRONIX 91HS8 HIGH SPEED ACQUISITION
Tektronix P7380 8 GHz Differential Probe / Parts
Tektronix TLS 216 Logic Scope
One-day shipping available
TEKTRONIX DS 1000 TELEVISION DEMODULATOR - ON SALE!
TEKTRONIX 1910 DIGITAL GENERATOR, EXCELLENT CONDITION!
TEKTRONIX 2430A 150MHZ DIGITAL STORAGE OSCILLOSCOPE
probes pouch man 30 day return 1 year prorated warranty
Tektronix P7240 4Ghz Probe ACCESSORIES #5 Tested
Tektronix RFM151Signal Scout Cable VRF Analyzer.
Tektronix CAGE 80009 card
Tektronix 2232 100Mhz Digital Storage Oscilloscope
NIST Calibrated, GPIB, New Probes, 1 Year Warranty.
TEKTRONIX CMD80 DIGITAL RADIO COMMUNICATIONS TESTER
Tektronix 2431L Digital Oscilloscope
Tektronix WFM300A Composite Waveform Monitor
Tektronix P7240 4Ghz Probe ACCESSORIES #2 Calibrated
Tektronix 1750 Waveform / Vector Monitor (Reduced)
Sony/Tektronix DG2020A Data Generator
Tektronix TSG120 YC/NTSC Signal Generator
Expedited shipping available
TEKTRONIX DSA 602A DIGITIZING ANALYZER 11A16 11A32
Tektronix 1910 NTSC Generator
Tektronix P7380-SMA 8GHz Differential Probe
complete in case
Tektronix TDS 220 Digital Real-Time oscilloscope
Tektronix WFM601A SDI Component WF Monitor NEW IN BOX
Tek 2467B Scope - Clean, ** Working w/ warranty
Tektronix 4105 Computer Display Terminal
Tektronix TDS460 Digital Oscilloscope: 350 MHz, 4 Ch.
One-day shipping available
TEKTRONIX 1103 TEKPROBE POWER SUPPLY OSCILLOSCOPE
Tektronix TEK R7912 Transient Digitizer Chassis
Tektronix AG7 Audio Generator For the TG700
Tektronix 2230 Tektronix 2230 Digital/Analog Oscillosco
Tektronix AA5001 Distortion Analyzer
Tektronix P6339A Buffered Passive Probe
Tektronix 764 Digital Audio Monitor & WFM-601A Waveform
TEKTRONIX P7260 ACTIVE PROBE, 6 GHz w/ CASE