PLC的指令表(语句表、指令程序、助记符语言)是由若干条PLC指令组成的程序。PLC的指令类似于计算机汇编语言的形式，它是用指令的助记符来编程的。
PLC的工作原理
PLC的工作过程，是一个循环的过程。对于有输入信号的时候，在循环扫描中检测到，并存入到存储器中，执行用户的程序，然后写输出操作，输出完成后，再重头检测是否有输入信号，如果没有就循环执行当前存储器中的程序并写输出。
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国内外PLC
世界上PLC厂家有200多家，型号有几千种。现在企业自动化生产线，使用的品牌95%为国际品牌，在经历多年的发展，国内的PLC厂家也有30多家。随着"中国制造2025"实际推进，工业自动化产业热潮不断升温，PLC市场看好。根据目前我国经济形势来分析，伴随着我国制造业的智能化改造，我国将迎来一个PLC市场高速增长的时期。
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Omron E3C-LDA11 Photoelectric Sensor Laser Amplifier
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SMC MXS6-50AS AIR SLIDE TABLE
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COGNEX DVT545C Color Vision Sensor with Pentax 12mm 1:1.4 lens
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SUMTAK IRH320 1000P/R/203
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DATA TRANSLATION INC DT2812 Rev AA
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HUBER+SUHNER SUCOFLEX 104PEA COAX N Male Plug RF Test Cable 1 Meter
Keyence LV-H32 LVH32 Digital Laser Sensor
Leica MZ75 Trinocular Stereo Zoom Microscope
Nikon BP Plan 5 DIC Objective Lens 0.1 210/0
Metrology PL-LWDM20/0.40∞ Objective Lens
AGILENT E4421B 250 KHz - 3.0 GHz ESG SERIES SIGNAL GENERATOR Opt: 1E5 1EM UNB
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