对于输入模块，电源LED显示表明输入设备处于受激励状态，模块中有一信号存在。该指示器单独使用不能表明模块的故障。逻辑LED显示表明输入信号已被输入电路的逻辑部分识别 。如果逻辑和电源指示器不能同时显示，则表明模块不能正确地将输入信号传递给处理器。输出模块的逻辑指示器显示时，表明模块的逻辑电路已识别出从处理器来的命令并接通。除了逻辑指示器外，一些输出模块还有一只保险丝熔断指示器或电源指示器，或二者兼有。保险丝熔断指示器只表明输出电路中的保护性保险丝的状态；输出电源指示器显示时，表明电源已加在负载上。像输入模块的电源指示器和逻辑指示器一样，如果不能同时显示，表明输出模块就有故障了。
Reliance Electric Circuit Board for GV3000/SE Drive C D
InterlinkBT 8 Out Bus Stop Station FDNP-S0008H-TT DeviceNet Free Shipping!
OEM IBM 75P4044 Cyan Toner Cartridge Infoprint 1354
Fanuc AC Spindle Servo Unit, A06B-6059-H206, W/ Fan Unit, A20B / 01A
OEM Xerox 053K91740 Filter Assembly CC Eltrex
Forney Engineering W20349 Computer Board
Allen Bradley 800H-PRBH16G Illuminated Pushbutton Green Input: 120 VAC
OEM Genuine IBM 3130 PagePrinter Transfer Unit
Allen Bradley Error Correcting RAM Memory Board, 1775-MS4,
Kato Engineering SU-1739 Circuit Board PCB SU1739 Free Shipping!
Asco ZB8342G001 Red-Hat Valve 120 VAC Coil Uses Rebuild Kit 322022 FreeShip
Horyu A CNC Circuit Board PCB
Qty INGERSOLL RAND ARO NO4 B0274 ADJUSTABLE PNEUMATIC NEEDLE VALVE
Mitsubishi PC Board, MC121A, # BN624A724G52, Revision F,
AB A-B Allen Bradley 1770-LDA Line Driver Receiver Chassis
Edwards 897B-004 Red Surface Back Electrical Box Free Shipping!
SKF(?) 16181 Ballscrew
IFM Efector PN2009 Pressure Sensor PN-1-1BRBR14-MFRKG/US/ /V Free Shipping
Asco 208780 Rebuild Kit
Fanuc AC Servo Motor, Mod a # A06B-0142-B175 #7008,
OEM Xerox 6R1298 006R01298 Fax 212 212 L Twins READ
Electro-Craft Servo Drive Module, DM-150X, P/N Rev G, , NO COVER
Applied Data Systems B Circuit Board PCB MA MLZ1 94V-0 E
Reliance PC-4S PCB A SA-78722 BROKEN TAB
Domnick Hunter Service Kit Desiccant Filter H2 Dryer Cartridge
Bridgeport ZDI Circuit Control Board,
Honeywell W973A1017 Logic Control Module
OEM Genuine IBM 53P9368 Black Toner Cartridge
Indramat Control PC Board, # A04-01.
Automation Direct AM1-AP-1A Inductive Proximity Switch Sensor Free Ship!
Lexmark 12G0321 Optra M410 Main Drive Assembly
FAB N2-004B Circuit Board PCB Free Shipping! N2-202.835.B0D N2-202.835.BOD
Reliance Type S-2E Drive Module, 440V, 34A, Abr. Nr.A1/6,
OEM Ricoh B B Front Ozone Filter
Siemens PC Board, 6SC6103-0SN30, 462 011.9087.30,
Savin 888124 Type 1036 Yellow Toner Cartridge OEM
Xerox Centreware 4.1sp Network Service Kit 300S01513 Document Centre
Cooper Lighting Modular Wiring System 27PF12/2G Fixture Fitting Lg Qty Avail
General Electric 44AGO, Circuit Board, APGM B,
Lg Qty Available ABB ACS350-01U-02A4-2 Drive
Tsubaki CR-4014 Chain Coupling Case CR4014 Free Shipping! Tsubakimoto
Rexroth LFA 32 DBU2AA100P15X12 Valve
Pillar Technologies Corporation AB1033-1 (D) Circuit Board Free Shipping AB10331