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PLC中的是PLC的核心，起神经**的作用，每台PLC至少有一个，它按PLC的系统程序赋予的功能接收并存贮用户程序和数据，用扫描的方式采集由现场输入装置送来的状态或数据，并存入规定的寄存器中，同时，诊断电源和PLC内部电路的工作状态和编程过程中的语法错误等。进入运行后，从用户程序存贮器中逐条读取指令，经分析后再按指令规定的任务产生相应的控制信号，去指挥有关的控制电路，
与通用计算机一样，主要由运算器、控制器、寄存器及实现它们之间联系的数据、控制及状态总线构成，还有外围芯片、总线接口及有关电路。它确定了进行控制的规模、工作速度、内存容量等。内存主要用于存储程序及数据，是PLC不可缺少的组成单元。
控制器控制工作，由它读取指令、解释指令及执行指令。但工作节奏由震荡信号控制。
的运算器用于进行数字或逻辑运算，在控制器指挥下工作。
Tektronix TDS 340 TDS340 digital scope, NISTcalibrated
additional free NIST recalibration within one year
Tektronix 141A PAL generator, guaranteed, 7 day ROR
TEKTRONIX 118-AS AUDIO DELAY SYNCHRONIZER
Tektronix TDS 210 TDS210 rack mounted scope, NIST-cal'd
additional free NIST recalibration within one year
Tektronix SD 32 50 GHz TDR Sampling Head
Tektronix TDS544A 500Mhz 4Ch 1GS/s Oscilloscope - Parts
TEKTRONIX 7A16A USPP 7A16A
Tektronix P7240 4Ghz Probe in box w/ ACCESSORIES nice
TEKTRONIX TLA 704 LOGIC ANALYZER WITH TLA 7L1
Tektronix P7260 GHz Active Probe TekConnect
TEKTRONIX 2465A or 2467 350MHz OSCILLOSCOPE cal+guarant
TEKTRONIX 2430A 150MHz OSCILLOSCOPE cal'd+FREE SHIPPING
TEKTRONIX 1740 WAVEFORM MONITOR / VECTORSCOPE
174-2117-01 Tektronix 24-Ch Data Probe 50-pin
Tektronix TM503 with DM501A, PS503A and DM502A
Chassis w/ 2 x Digital Multi-meters and a Power Supply
TEKTRONIX 2467 350 MHZ OSCILLOSCOPE w/probes&more stuff
NASA CALIBRATED - COMES WITH CART, PROBES, ETC.
TEKTRONIX SPG-422 Digital Sync w/Test Generator SPG422
TEKTRONIX R7704, 7A18, 7A22, 7B70 RACKMOUNT MAINFRAME
Tektronix 5441 50 MHz Storage Oscilliscope w/Plug-ins
One-day shipping available
Tektronix 1503C Portable MTDR Cable Tester "NICE"
TEKTRONIX TEKCONNECT O/E ADAPTER * CSA7404 * CSA7154
TEKTRONIX 2247A 100MHz OSCILLOSCOPE calibrated + guaran
One-day shipping available
Tektronix 2465A Oscilloscope
Tektronix WFM90 NTSC Waveform/Vectorscope
30-day warranty/14-day right of return
TEKTRONIX P6201 FET ACTIVE PROBE 900MHZ
Tektronix DSA602/4C Signal Analyzer
Tektronix 11802 Digital Sampling Oscilloscope
Tektronix VX4237 multimeter - VXI card
Expedited shipping available
Tektronix P6217 4 GHz Active Probe
Tektronix VS211 PAL Video Synchronizer
30-day warranty/14-day right of return
Tektronix P7240 Active Probe; 4 GHZ BW, 2.0V DYNAMIC R
Tektronix P7260 ACTIVE PROBE; 6.0 GHZ, 5X/25X, 1.5/6V
TEKTRONIX 11A81 3 GHz SINGLE CHANNEL AMPLIFIER PLUG-IN
TEKTRONIX J17 LUMACOLOR PHOTOMETER WITH OPTIONAL J1811
Tektronix 555 Oscilloscope Dual Beam Serial #010281
Tektronix 1780R Video Measurement Set, NTSC
Calibrated, 30-day warranty/14-day right of return
TEKTRONIX A6303 CURRENT PROBE
TEKTRONIX VX4802 DIGITAL I/O MODULE
Tektronix TEK TOP300 Fiber Optic Visual Fault Finder
Tektronix TDS1002 Digital Storage Oscilloscope w/probes
One-day shipping available
Tektronix 1910 NTSC TV Digital Generator
Tektronix THS720 100 MHz Digital Real-Time Oscilloscope
TEKTRONIX TLA7M4-1S 2 GHZ LOGIC ANALYZER TLA704 TLA711
Tektronix AM503B AC/DC Current Probe Amplifier
TEKTRONIX TLA 704 LOGIC ANALYZER 714 CARD LOADED
Tektronix P6150 Passive Probe, DC to 9 GHz, Low Impedan
Tektronix 1721 PAL Vectorscope
Tektronix SD20 Loopthrough Sampling Head
TEKTRONIX VX4610 TEKTRONIX SDH/SONET GENERATOR RECEIVER
Tektronix 2465B 400MHz Oscilloscope !!! REDUCED !!!
Tektronix R7613 SCOPE MAINFRAME 7613
Tektronix Xerox Phaser 8200N Solid Ink Color Printer
FLUKE PM3094 Oscilloscope 200 MHz 4CH vs Tektronix / HP
TEKTRONIX TEKCONNECT O-E ADAPTER * TDS7404 * TDS7154
Tektronix Digital Scope TDS 210
Tektronix 2246 100Mhz 4 Ch.Oscilloscope *NIB* W/Probes
Tektronix VITS 200 NTSC VITS Inserter