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。
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
Symbol Motorola LS4278 Wireless USB Laser Scanner Kit With Scanner,Cradle &Cable
Cognex Dataman DM7550 Wireless 2D Direct Part Mark DPM Code Scanner USB Kit
Rofin Sinar 130400516 Laser Scan Head + LiNos F-Theta Ronar f=254 mm 1064nm lens
Yaskawa SGMAH-04AAA4C AC Servo Motor
Omron CP1E-N40DR-A CP1EN40DRA PLC
Yaskawa SGMAH-01AAA4C 100Watt AC Servo Motor
SMC MXS6-50AS AIR SLIDE TABLE
Sorensen DLM 8-75 0-8V 0-75A GPIB Interface Programmable DC Power Supply
Sorensen DLM 20-30 0-20V 0-30A GPIB Interface Programmable DC Power Supply
MITSUBISHI MR-J2S-70A SERVO MOTOR DRIVER
SGDA-02VP SGMP-02V314T YASKAWA SIGMA AC Servo Motor 200W
Agilent 11713A + 8494H 11dB Step Attenuator + 8120-2703 REV-B Attenuator Cable
Omron E5GN-Q1TC Temperature Controller 100-240 Vac (Lot of 2)
Keyence KZ-80T KZ80T PLC
COGNEX DVT545C Color Vision Sensor with Pentax 12mm 1:1.4 lens
Berghof 2011020 + 13351 and 13483 Terminal Connector
Mitsubishi Melsec Q06HCPU Q61P QJ61BT11N QD75P4 x3 QX42 QY42P QD75P1 QH42P
KEYENCE CV-3000 CV-3001 CV-S035MH CCD High Speed Digital Machine Visiion System
SANYO DENKI PM Driver PMDPC1C3P20
Faulhaber MCDC 2805 Motion Control
ICOS IVC-1000 JENOPTIK 017912-001-26 OP773 HT0605 and X 5 Objective Lens
KEYENCE KV-40DT PLC
Beckhoff CX9000 CX9000-1001 CPU Module with K-Bus Interface
FLEXBAR ELMO TSN411D CCD COLOR CAMERA
FLEXBAR MICROSCOPE XY LINEAR STAGE SLIDE TABLE
SONY SSC-DC50A DIGITAL COLOR VIDEO CAMERA
DEK S240 S240-1A/8+500LD?+GPL65-5:1 43-0554 Motor
DEK S663-1A+RM21-10?00+ConNS 43-0968 Motor
DALSA Falcon DS-21-04M15 -12E Camera link Mono Area Scan Camera
SUMTAK IRH320 1000P/R/203
MITSUBISHI K10012B K10012 GEARHEAD
Panasonic FP0-C14 FP0-C14RS-A Control Unit
Chromalox PROTOCOL PLUS PROTOCOL- 4 0112-PROTO-COL4 CONTROLLER
Panasonic MSMD041P1S 400 Watt AC Servo Motor
DATA TRANSLATION INC DT2812 Rev AA
ETEL UltimET Light motion controller EU-LCP-0-000-00 670544-01
OMRON F250-C10 VISION MATE ConTROLLER SYSTEM
lot of 13, Beckhoff KL1418 8 Channel Digital Input Module 24V
Vieworks VA-8MC C16A0 8M Camera link Progressive Scan High Performance Camera
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
Agilent 11903D Adapter, 2.4 mm (f) to Type-N (m), DC to 18 GHz
Agilent 1250-1744 Adapter Type N (m) to sma 3.5mm (f)
Kingston 16GB 2X8GB PC-5300 DDR2 667MHZ ECC REGISTERED KVR667D2D4P5K2/?16G
COGNEX VM16A 203-0075-C BOARD
SIEMENS MICROMASTER 420 6SE6420-2AD23-0?BA1 3KW
ConTEC CPU-SB10 /64 PLC Module
Mini-Circuits ZN4PD1-63-S+ Coaxial 4 Way Power Splitter 2000-6000 M
