是采用“顺序扫描，不断循环”的方式进行工作的。即在PLC运行时，CPU根据用户按控制要求编制好并存于用户存储器中的程序，按指令步序号（或地址号）作周期性循环扫描，如无跳转指令，则从**条指令开始逐条顺序执行用户程序，直至程序结束。然后重新返回**条指令，开始下一轮新的扫描。在每次扫描过程中，还要完成对输入信号的采样和对输出状态的刷新等工作。
NIB PASSAGEWAY TELE-TOUCH ENTRY DIRECTORY SYSTEM W62BN-4108508-E04
MOBILE AUTHORITY5.6" MOBILE VIDEO LCD MONITOR M58, SLCD-560R, & ACCESSORIES
SAFT LS14500-STS AA SIZE LITHIUM BATTERIES 3.6V
NIB LEUZE ELECTRONICHRTR 3B/66-S8 PHOTOELECTRIC SENSOR 50107229, 10-30VDC
3M SCOTCHLOK MNU10-250DMIX TERMINALS NYLON INSULATED 12-10 AWG
3M SCOTCHLOK MV18-10FX FORK TERMINAL VINYL INSULATED
HIGH RESOLUTION CCTV LENSES 12MM F1.2
POWER SONIC PS-1212RECHARGEABLE BATTERY12V, 1.4 AMP. HR. PS1212
NATIONAL ELEC. NL-A170PE RECTIFIER
NIB NATIONAL ELECTRONICS NL-615 RECTIFIER VACUUM TUBE NL-615/7018
3M SCOTCHLOK MVU14-110DFX TERMINALS ,16-14 AWG
M/A-COMBATTERY PACKS 2500mAh, BKB191, BKB 191202/2 R6A, 7.5V
GUARDIAN BY DOUGLASMODEL: DG 410 SEALEDRECHARGEABLE BATTERY 4VOLT 10.0AH
KRONES 1-071-56-034-0
DIODE LASER RADIATION PEN WAVELENGTH 630-680NM
ICC IC108SB2IV SURFACE MOUNT BOXES ELITE 2-PORTIVORY
GENERAL ELECTRIC 3-5158 COMPUTER
NIB MOTOROLA NLN7162A RE**CEMENT BATTERY 7.5V
3M SCOTCHLOK MV18-8FBX FORK TERMINALS MV188FBX, 22-18 AWG
DTP 126692-202 EAR
NIB SONY AC-E90HG ACPOWER SUPPLY 9V 800MA
NIB TRIP LITE ULTRABLOK 428 P/N: IB1984ISOBAR
3M SCOTCHLOK MV14-6R/SX RING
ZIOTEK180 0515 2"x 1"x 1"CAT5E INLINE COUPLERS SHIELDED CAT.5e
TAMRON HIGH RESOLUTION CCTV LENS 1:1.8 12MM
BI-DIRECTIONAL IEEE 45-1806 PRINTERCABLE 6FT.
3M SCOTCHLOK MV10-8RX RINGTERMINALS VINYL INSULATED
MOTOROLA M838P2 MULTIPLIER 7.5V NI-CD B
SFC 7430E8005 D PROCESSOR CHIP
LITHONIA LIGHTING ELB0607 RE**CEMENT BATTERY 6V
ADC RJ11 KEYSTONE RIGHT ANGLEIVORY CAT NO 64675195-10
NIB WESTINGHOUSE WL923 ELECTRONIC TUBEWL923
MCHC470M2EB ALUMINUM ELECTROLYTIC CAPACITORS
NIB MOTOROLA 2580955Z02 POWER SUPPLY INPUT: 120VAC 60HZ 5W
SFC 7430E 8018 D PROCESSOR CHIP
SQUARE D 8501-NR52 RELAY SOCKET 10 AMP,300V
EMPIRE 10165-S CABLEITW
TADIRAN TL-2100/S LITHIUM
TADIRAN BATTERIES TL-2100/T CELL SIZE AA
SAFT LS 17500 LITHIUM BATTERY 3.6V
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