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所谓软PLC实际就是在PC机的平台上、在Windows操作环境下，用软件来实现PLC的功能。此概念大约在1996年以后才被介绍到国内来。由于这种技术尚不成熟，所以只有在学术界少数人对此关注。尽管Interllution和Wonderware的HMI和SCADA软件在我国推广都很成功，但它们的软逻辑、软PLC产品P-31和InControl却少有人问津。当然，这两家公司也不曾刻意去开发这个市场。
Think&Do和Steeperchase的VLC都是1998、1999年进入中国市场的，特别是Think&Do花了很大的努力，至今仍不尽如人意。当然有一些成功应用，如邮件分拣系统。我感觉，这多少与它们不采用IEC 61131-3，而是倡导用流程图编程语言不无关系。
ESI CKA 67412 GALVO DRIVER BOARD ESI LASER
Martin Fiber Source CMY150 Color Illuminator
THK Liner Guided Slide 51CM With Smart Motor SM2337D
Keyence EX-510 High accuracy inductive gauging sensor
SHINKO AC SERVO MOTOR DRIVER SSD-3036K W/MOTOR SET NEW
ETS Lindgren EMI/RFI Shielded Chamber T/T 12x12x12"
Jaguar DBC6830 ECU XJ40 4.0 NEW
Burkert 8630 Posistioner Control w 2702 Valve Actuator
Truninger AG QT32/32/32 Hydraulic Pump
Spectra Physics Model SOM-79
SGI Silicon Graphics ORIGIN 2000 CMNA015 deskside serve
Cyberoptics cyberscan Laser Profilometer head with CCD
Vexta 5 Phase Driver UDK5128NA WITH PK599AUHA MOTOR
SONY LT11A-201B Display with DT12P or DT512P Probe
IAI RCS2-RA5C-A-60-4-100-T2-R03 With Driver NEW
IAI RCS-RA55R-A-60-GN-M-300-S With Driver NEW
Motorola MVME 162-220 Board with IP-Octal Serial
Quad Align Head Assy 10-22603 With extral
Sumitomo Variable Frequency Drive invertor HF32043 NEW
Sumitomo Variable Frequency Drive invertor HF32043 NEW
Sumitomo Variable Frequency Drive invertor HF32043 NEW
Basler L402K Line Scan Camera With cable
Parker/Daedal Motorized Linear Stage 30" Travel
Enviromental test chamber model TC550
Omron NT600S-ST121-V3
White Knight AT 100 Chemical Diaphragm Pump
SOLECTRIA DC-DC750 DC/DC Converter
HP/Agilent 3499A Switch/Controller Mainframe W/5 Card
HP 6652A SYSTEM DC POWER SUPPLY 0-20V/0-25A W/GPIB
LECROY AP-1M HIGH IMPEDANCE ADAPTER HI-Z BUFFER
OMRON AMD-S MOTION DETECTOR NEW
IFI CC-108EXX DC-1600MHz TEM Cell
VICKERS Direction valve DG5V-H8-2A-T-P2-V-80-JA NEW
NERA CITYLINK IDU unit
NERA CITYLINK IDU unit
Automotion LC4BP13002 Driver
Parker Compumotor S6-DRIVE, S83-135 SERVO DRIVE
Vexta Oriental Motor ASM98MC-P25 ALPHASTEP MOTOR NEW
Kollmorgen Servostar XT Servo motor MTC308C1 W/Driver
Kollmorgen Servostar XT Servo motor MTC304B1 W/Driver