PLC之间的通讯网络是各厂家专用的，PLC与计算机之间的通讯，一些生产厂家采用工业标准总线，并向标准通讯协议靠拢，这将使不同机型的PLC之间、PLC与计算机之间可以方便地进行通讯与联网。
了解了PLC的基本结构，我们在购买程控器时就有了一个基本配置的概念，做到既经济又合理，尽可能发挥PLC所提供的佳功能。
基本指令系统特点
PLC的编程语言与一般计算机语言相比，具有明显的特点，它既不同于语言，也不同与一般的汇编语言，它既要满足易于编写，又要满足易于调试的要求。目前，还没有一种对各厂家产品都能兼容的编程语言。如三菱公司的产品有它自己的编程语言，OMRON公司的产品也有它自己的语言。但不管什么型号的PLC，其编程语言都具有以下特点：
Bodine Parallel Shaft DC Gearmotor 42D3BEPM-E4
Black Box Network SW725A-R3 ServSwitch KVM Switch
Black Box Network SW724A-R2 ServSwitch KVM Switch
Galtek Fluoroware 202-90 Diaphragm Valve BRAND NEW
Furon UPM2-F1216NC 2-Way 3/4” Orifice Diaphragm Valve
Furon RDV2-F16NC-0 2Way Manual Diaphragm Valve
Furon UPBM-F1216-P
Fujitsu FC9607SVD1 Supervisory OSS Interface
Fujitsu FC9607PWH1 Power High-Speed Unit FLM 2400 ADM
Fujitsu FC9607MPD1 Microprocessor FLM 2400 ADM
Fujitsu FC9607HTL1 Wideband Unit for FLM 2400 ADM
Fujitsu FC9607HSN2 High-Speed Switch Unit FLM 2400 ADM
Fujitsu FC9607HMA1 High-Speed Multiplexer FLM 2400 ADM
Bio-Rad 1125B Dual Temperature Slab Gel Dryer
Bell & Howell No. 014660 Lamp Supply Unit
Beckman JA-20 Rotor, Fixed Angle, 8 x 50mL, 20,000RPM
Beckman JA-14 Rotor, Fixed Angle, 6 x 250 mL, 14,000RPM
Beckman Spinco 152 Microfuge Centrifuge
Beckman DU-40 DU40 Spectrophotomet?er
Cincinnati Fan LM-3 Cast Aluminum Volume Blower
Dictaphone 3750 ExpressWriter Plus? w/ Headset & Foot
Baldor CDB3558T-11 Brushless DC Motor 2HP 300V 1800RPM
Central Scientific CAT#: 82489-2 Desk DC Milivolt Meter
Parker NW-04 Universal Nut Wrench 1/4” NW-04-U
Mitsubishi Roithner ML701B1R-E21A 1.3um Laser Diode
Mitsubishi Roithner ML720A1S-E22E 1.3um Laser Diode
Avocent Equinox SST-4/8P Multiport Serial PCI Adapter
Automotion ALC12DE-010-131?2 Servo Amplifier Series E
Apollo Computer Excelan EXOS 302 Controller Board VME
Apollo Computer Domain Ring Board VMEbus VME
AP Tech AP1810 Pressure Regulator AP1810S-3P-660P NEW
Antec / Lightwave Communications LLMM Chassis VME
Ames 5772 Clinitek 100 Urine Chemistry Analyzer
AMCI Advanced Micro Controls Inc. DC425-1003 DuraCoder
Alliance Sys CSU DSU Adit 600 TDM Control FXS Modules
Allen Bradley SLC 500 Programmable Controller DH-485
Advance Automation Model MF2 Cylinder I-4X4-MF2-NC-1-?#2
Adtran TSU 600e Modular 1/FT1 Multiplexer PN: 1202076L1
ADC Soneplex Ver. G HLXR Module Remote HDSL Interface
ADC Soneplex Ver. D HLXR Module Remote HDSL Interface
Adaptec AHA-2740A AHA-2740A/42A/4?0AT/42AT SCSI Adapter
Acromag AVME947x / AVME9475 VMEBUS Industrial I/O Board
3Com SuperStack II 3C16610 Dual Speed 12-Port Hub 500
Panasonic CF-28 ToughBook NoteBook w/ Power Supply
TBI-Bailey ABB TBN58 pH Transmitter
Beckman JA-20 Rotor, Fixed Angle, 8 x 50mL, 20,000RPM
Beckman JA-14 Rotor, Fixed Angle, 6 x 250 mL, 14,000RPM
Beckman Spinco 152 Microfuge Centrifuge
Beckman DU-40 DU40 Spectrophotomet?er
Cincinnati Fan LM-3 Cast Aluminum Volume Blower
Dictaphone 3750 ExpressWriter Plus? w/ Headset & Foot
Baldor CDB3558T-11 Brushless DC Motor 2HP 300V 1800RPM
Central Scientific CAT#: 82489-2 Desk DC Milivolt Meter
