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众所周知，目前我国75%的生产机械设备，都是采用继电器控制，除了可靠性差外，设计程序也很繁杂。从方案的确立到技术条件的设计以及施工的设计，图面的工作量很大，这势必造成设计周期长。而采用PLC控制可以大大缩短设计周期，甚至有些文件资料也不必绘制成图。设计人员完全可以利用编程器上屏幕显示来输入，或修改程序使得梯形图能准确无误地反映生产要求。编程人员也可根据新产品对生产提出的新工艺要求，重新编写程序并把它存储在EEPROM模块中去，需要加工哪个产品的程序，操作可以随时调用，这既方便、简单又可保密。开发这种软件对优化生产过程，提高产品数量和质量，提高劳动生产率，具有实际意义。**一点也深受生产及设计者的欢迎。
六、PLC新发展状态及趋势
TEKTRONIX P6207 4 GHZ ACTIVE OSCILLOSCOPE PROBE TDS820
Tektronix TDS 220 TDS220 oscilloscope, NIST-certified
additional free NIST recalibration within one year
Tektronix WFM601A and 764 Digital Audio Monitor
TEKTRONIX 2465B 400MHz OSCILLOSCOPE + cal'd +ranty
Tektronix PG506A Oscilloscope Calibration Generator
Tektronix TG501A Oscilloscope Time Mark Generator
Siemens / Tektronix K1297 with Prime E1 Module
TEKTRONIX TDS380 2ch Oscilloscope, 400 MHz, 2 GS/s
Tektronix TDS540A Oscilloscope 500MHz 4Ch 1GSa/s
TEKTRONIX 1450 /1/3/ MAINFRAME
Tektronix TLA7AA4 8S 8Mb 136Ch Logic Analyzer Module
One-day shipping available
Tektronix DSA602A Digitizing Signal Analyzer, 1 GHz
Tektronix SCALCF1 Calibration Fixture
Tektronix 1411 PAL Video Generator Mainframe
Tektronix 1750A NTSC Waveform, Vector, SCH Monitor
Tektronix 2467B 4-Channel 400MHz High Writing Speed Osc
Tektronix 012-1221-00 2 Meter Cable For Sampling Heads
Tektronix 1740-6 Waveform Vector Monitor
Tektronix ST103-RX-TX Sonet Transmission Test Set. Tran
Tektronix 1410 NTSC Video Generator Mainframe
Tektronix P6022 Current Probe Kit
Tektronix TR503 Tracking Generator
Tektronix TDS320-14 100 MHz, Dual Channel, Digital Osci
Tektronix SG504 Leveled Sinewave Generator
Tektronix OCP5002 2GHz Optical Converter / Power Meter
Tektronix VX4355 24 channel switch dpst or spdt relay
Tektronix VX4372 256-Crosspoint Relay Matrix Module
Tektronix VX4342 2 Ch. Resistor Prog.VXI Resistance Mod
Tektronix TLA7M2-1S Logic Analyzer Module
Tektronix 11801C Digital Sampling Oscilloscope
Tektronix DSA602 /4C Digitizing Signal Analyzer DSA 602
Tektronix VX4236 Digital Multimeter VXI Module
TEKTRONIX 2465DMS 300MHZ 4-CHAN OSCILLOSCOPE 2465 DMS
Tektronix TLA7L3 State/Timing Module with Accessories
Tektronix TSG-100 NTSC Television Test Signal Generator
One-day shipping available
TEKTRONIX VFM90
Tektronix 1502C Metalic TDR Cable Tester,YT-1S,Parts
Tektronix 2706 Preselector RF Stepping
Calibrated, 30-day warranty/14-day right of return
TEKTRONIX 760A STEREO AUDIO LEVEL PHASE SCOPE MONITOR
TEKTRONIX TDS 520 2 CHANNEL DIGITIZING 500MHz 500MS/s
Tektronix TDS 430A 2-Channel Digitising Scope 400 MHz
Tested and Working
Tektronix 2235 USM-488 100MHz Dual Channel Oscilloscope
One-day shipping available
TEKTRONIX TDS2014 digital OSCILLOSCOPE 100MHz 1Gs/s 4ch
Tektronix 1103 Tekprobe Power Supply