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自1836年继电器问世，人们就开始用导线将它同开关器件巧妙地连接，构成用途各异的逻辑控制或顺序控制。至今，在PLC的编程语言——梯形图中还可以看到这些布线的影子。直到60年代末、70年代初可编程控制器问世，随着微电子技术、计算机技术和数据通信技术的飞速发展，以及微处理器的出现，PLC产品朝小型和**小型化方面进行了一次飞跃，终使早期的PLC从初的逻辑控制、顺序控制，发展成为具有逻辑判断、定时、计数、记忆和算术运算、数据处理、联网通信及PID回路调节等功能的现代PLC。
逻辑控制：PLC具有与、或、非、异或和触发器等逻辑运算功能，可以代替继电器进行开关量控制。
定时控制：它为用户提供了若干个电子定时器，用户可自行设定：接通延时、关断延时和定时脉冲等方式。
Tektronix TLA714 Portable Logic Analyzer
Includes TLA7N4 136 Channel LA Module
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TEKTRONIX TLS216 DIGITAL OSCILLOSCOPE 16CHANNEL 500MHz
Tektronix TDS724C/13/1F/2F Oscilloscope
Tested working, 14-day right of return
Tektronix VX1410A Intelliframe VXIbus Mainframe 13 Slot
Tektronix VX4223 160MHz Universal Timer/Counter
Tektronix TLA7L3/1s/2s Logic Analyzer Module, 102 Ch.
Guaranteed fully working. New 1yr calibration 14day RoR
Tektronix TAP2500 2.5 GHz Active Voltage Probe #2
Tektronix TAP2500 2.5 GHz Active Voltage Probe #1
Tektronix TAP2500 2.5 GHz Active Voltage Probe #3
Tektronix TAP2500 2.5 GHz Active Voltage Probe #4
TEKTRONIX TLA704 LOGIC ANALYZER (2) TLA7M4 OPTION 1S
Tektronix WFM-601E Serial Digital Component WFM w/ eye
Tektronix TSG422 SDI Test Signals Generator
Tektronix CMD80 /X05 Loaded CDMA Test Set
Tektronix TDS460A Oscilloscope 400MHz 100MS/s 4 Chs
Tektronix TDS520C 2-CH Oscilloscope, Digital, 500MHz
TEKTRONIX TLA704 LOGIC ANALYZER (2) TLA7N3 OPTION 6S
Tektronix VX4350 SPDT SurePath Switch
Tektronix VX4801 48-Channel Isolated Digital I/O VXI Ca
Tektronix Gigabert GB1400T Generator-GB-1400T
Tektronix RTD710A Waveform Digitizer RTD 710A
Tektronix ST112 Sonet Transmission Test Set P
Tektronix CP1160 w/ DEC Digital 1135-FC & 11/40HK
Tektronix TDS 620A Digital Oscilloscope 500Mhz 2GS/s
NEW Tektronix YBT1E1 T1 or E1 tester NetTek Y400 Y350C
TEKTRONIX TDS520D 500MHz DIGITAL PHOSPHOR OSCILLOSCOPE
TEKTRONIX TDS520D DIGITAL PHOSPHOR OSCILLOSCOPE + 1F 1M
TEKTRONIX TDS520D DIGITAL PHOSPHOR OSCILLOSCOPE DPO +1M
Tektronix TDS744 500Mhz 4Ch 2GSa/s Digital Oscilloscope
New LCD Display Options: 13, 1F, 1M, 2F
TEKTRONIX TM506 6-SLOT MAINFRAME PWR MDL TEST STATION
One-day shipping available
TEKTRONIX TM506 6-SLOT MAINFRAME PWR MDL TEST STATION
One-day shipping available
TEKTRONIX 1750 & 1751 WAVEFORM / VECTOR MONITOR
TEKTRONIX TDS724A TDS 724A 500MHz 1GS/s OSCILLOSCOPE
Tektronix 2430A Digital Oscilloscope
sold as-is see the description
Tektronix 492P Tek Spectrum Analyzer Opt 1,2 GPIB Wrks
Tektronix TLA7NA2 Logic Analyzer Module TLA7012 TLA7016
Expedited shipping available
Tektronix P7504 4 GHz, Trimode Differential Probe
Tektronix P7380A 8.0 GHz Differential Probe TESTE
Tektronix P7380 8 GHz Differential Probe
Tektronix TDS520B 500 MHz Oscilloscope (Reduced!)
Tektronix TDS 460 TDS460 scope, limited NIST-cal
additional free NIST recalibration within one year
Tektronix DG2030 Data Pattern Generator
One-day shipping available
TEKTRONIX TLS216 LOGIC ANALYZER SCOPE TLS 216
TEKTRONIX TLA711 LOGIC ANALYZER + 7M4 7D1 P6434 P6417
Tested & Calibrated - Warranty Included!!!
Tektronix 2232 100 MHz Digital Storage Oscilloscope DSO
2 Tektronix 577 curve tracer D2 & D1, 177 power module
Tektronix HFS9003 Pulse Generator w/ HFS9DG1 Data Card
HFS Programmable Stimulus Sytem / Data Time Generator
TEKTRONIX 1411 GENERATOR WITH SPG12, TSG11, TSG16
TEKTRONIX 1410 GENERATOR WITH 7 PANELS!
Tektronix TDS644A
Tektronix DS1001G Television Demodulator, NTSC
TEKTRONIX TLA622 LOGIC ANALYZER w/ OPTION 6S &1J
Tektronix TDS754D 500 MHz 4CH 2GS/s DPO Oscilloscope
TEKTRONIX * 1502B * METALLIC TDR CABLE TESTER
Tektronix TM506 6 Slot Modular Main Frame for TM500
One-day shipping available
Tektronix 1910 Digital Generator
Expedited shipping available