根据统计资料表明：在PLC控制系统的故障中，CPU占5%，I/O接口占15%，输入设备占45%，输出设备占30%，线路占5%。前二项共20%故障属于PLC的内部故障，它可通过PLC本身的软、硬件实现检测、处理；而其余80%的故障属于PLC的外部故障。因此，PLC生产厂家都致力于研制、发展用于检测外部故障的专用智能模块，进一步提高系统的可靠性。
编程语言多样化
在PLC系统结构不断发展的同时，PLC的编程语言也越来越丰富，功能也不断提高。除了大多数PLC使用的梯形图语言外，为了适应各种控制要求，出现了面向顺序控制的步进编程语言、面向过程控制的流程图语言、与计算机兼容的高级语言（BASIC、C语言等）等。多种编程语言的并存、互补与发展是PLC进步的一种趋势。
PCT SYSTEM 6000 E/E MEGASONIC HYPERCLEAN GENERATOR
TEKTRONIX TDS 320 DIGITAL 2 CHANNEL 100MHz OSCILLOSCOPE
AEROTECH MOTION BASE ALS20010M W/MT240DRIVER&RSF MSA
MARCONI INSTRUMENT 2305 MODULATION METER
CKD ABSODEX DRIVER S TYPE AXC9009S-D08-P3
OLYMPUS OTV-F3 COLOR VIDEO CAMERA CONTROLLER OES TV
JDS UNIPHASE 2214-30SLQTA Argon Ion laser
ALBANY DOOR SYSTEMS ACS 70 PATENT PENDING WITH PENDENT
OMRON NT31-ST121B-EV2 INTERACTIVE TOUCHSCREEN DISPLAY
HP 21440A 7.5/5 PROB UNIT
KIKUSUI PAC 16-10 REGULATED DC POWER SUPPLY 16V 10AMP
WAGO-I/O SYSTEM 750-304 INTERBUS-S KOPPLER W/750-401
HP 6033A SYSTEM POWER SUPPLY 0-20V/0-30A
ANCOT FCA-5000 FIBER CHANNEL ANALYZER 110V AC
HP 83480A DIGITAL COMMUNIUCATION ANALYZER
WHYETECH AUTOMATION XY5-3050 STEPPING MOTOR CONTOLLER
NIRECO TENSION CONTROLLER TC 440 TC440
PHILIPS PM 5680 TV IF MODULATOR
OPTIMISED CONTROL EB0234A04 BOARD CARD GOOD CONDITION
LIGHTNIN LABMASTER STIRRER MIXER L1U10 230v 90w
SCIENTIFIC ATLANTA 7550B 5.8-6.4 GHZ UP CONVERTER
PHILIPS PM5193 PROGRAMMABLE SYNTHESIZER/FUNCTION
GENERATOR 0.1mHz-50MHz
HP 6622A DUAL OUTPUT DC POWER SUPPLY 50V 2A ,20V 4A
ROHDE & SCHWARZ R&S POLYSKOP SWOB 5
PHILIPS MEDICAL SYSTEM X-RAY TUBE HOUSING ASSEMBLY
OMRON SYSDRIVE 3G3IV-A2055-EV1 INVERTER 5.5KW 200VAC
HAMAMATSU UV Spot Lightsource LC5 LightningCure
CENTURION SCIENTIFIC CENTRIFUGE 6060 SERIES 230VAC
TAKASAGO REGULATED DC POWER SUPPLY SX010-150 230VAC
