五种标准化编程语言：顺序功能图（SFC）、梯形图（LD）、功能模块图（FBD）三种图形化语言和语句表（IL）、结构文本（ST）两种文本语言。选用的编程语言应遵守其标准（IEC6113123），同时，还应支持多种语言编程形式，如C，Basic等，以满足特殊控制场合的控制要求。
(五)诊断功能
PLC的诊断功能包括硬件和软件的诊断。硬件诊断通过硬件的逻辑判断确定硬件的故障位置，软件诊断分内诊断和外诊断。通过软件对PLC内部的能和功能进行诊断是内诊断，通过软件对PLC的与外部输入输出等部件信息交换功能进行诊断是外诊断。
PLC的诊断功能的强弱，直接影响对操作和维护技术能力的要求，并影响平均维修时间。
(六)处理速度
PLC采用扫描方式工作。从实时要求来看，处理速度应越快越好，如果信号持续时间小于扫描时间，则PLC将扫描不到该信号，造成信号数据的丢失。
处理速度与用户程序的长度、处理速度、软件质量等有关。目前，PLC接点的响应快、速度高，每条二进制指令执行时间约0.2～0.4Ls，因此能适应控制要求高、相应要求快的应用需要。扫描周期（处理器扫描周期）应满足：小型PLC的扫描时间不大于0.5ms/K；大中型PLC的扫描时间不大于0.2ms/K。
ASE2000-COM Communication Test Set by Applied Systems
PACKETEER PacketSeeker 6500 PS6500-L000M NEW
Honeywell 51304672-150 Analog Output Spare forTDC 3000
Agilent G1315-60015 Micro High-Pressure Flow Cell NEW
SEL-387 Current Differential & Overcurrent Relay 110VDC
Alcatel 3BA23197BA CPU6 Board 40G 128M New
Alcatel 3AL78830AE card for 1660 1662SMC etc New
Alcatel 3AL98023AA ENHANCED SERGI for 1662SMC etc New
NeoScale CryptoStor Tape 700 SC702R NEW
Alcatel P8DCN 3AL98248AA for 1662 SMC etc
NEW Callenberg SYMAP ECG ENGINE CONTROL GENERATOR
USSI Board N451910-5102 LM1601-9R LM3020-9 Ansaldo
New USSI Auxiliary Board PN: N12360401 Ansaldo
SIEMENS SIMODRIVE 6SN1123-1AB00-0BA1 6SN1118-1NH01-0AA0
Lot 3000 AA264-87LF SKYWORKS Chips Digital Attenuator
JAMES H. HEAL EB640PRJH light fastness tester Power
Agilent 79846-66501 ICO INJECTOR BOARD AY New in box
Lot 1500 RICOH PC card controller R5C554-CSP277 $0.8/pc
TOYOPUC PC3JP TIC-6215 TOYODA Machine
TOYOPUC PC3JG-P TIC-6088 1.90 CPU Module TOYODA Machine
IRIS Model P522 P522AC Flame Monitor Signal Processor
Lot 25 Agilent G1531-60010 FID Signal Boards SOLD AS IS
SSB DAPF-WHI010-0410 Motor New
Used Thrane & Thrane TT-3022D 403022D & TT-3005M Antena
SHIMADEN PAC 36 PAC36P415 THYRISTOR Power Regulator new
Anspach xMax Arthroscopy Drill Refurbished
NORTEL UPPER COOLING UNIT Assembly NTHR52AB new spare
OCCAM 6151-01 Lifeline POTS blade New
ECS O.P.TFT 12.1 LCD CNC 1800 080H819 USED Spare part
EXCEL 1001F Laser Head 1031 Romote Receiver 1040B Power
Ferraz Shawmut W236919A PC84UD90V30CP99 900V 3000A FUSE
Agilent HP RTL Pesticide Library G2081-60001 G2081AA
PFEIFFER Vacuum Pump DUO 2.5 Agilent G3170-80026 230VAC
New ABB ABB800 RDCU-02C Controller Board
Lot 2200 SMSC KBC1098-NU chips $0.5/pc Date:0915 NEW
Lot 2500 Vishay VSSR2401472G Thin film resistor 0.44/pc
Lot 2500 Vishay VSSR2401103G Thin film resistor 0.44/pc
enercon control board LM4027-04 New
Lot 211 pcs RENESAS M30622MWP-152FP M30622 IC $5/pc
ASML-HR 4022.430.0530 P-CHUCK DRIVE Board RepairedSpare
HoneyWell C7061F2001 Purple Peeper Flame Detector C7061
Alcatel 1662SMC Shelf Rack Case New
Lam RESEARCH Node Board 810-800256-005 Rev A New
