PLC与电气回路的接口，是通过输入输出部分（I/O）完成的。I/O模块集成了PLC的I/O电路，其输入暂存器反映输入信号状态，输出点反映输出锁存器状态。输入模块将电信号变换成数字信号进入PLC系统，输出模块相反。I/O分为开关量输入（DI），开关量输出（DO），模拟量输入（AI），模拟量输出（AO）等模块。 开关量是指只有开和关（或1和0）两种状态的信号，模拟量是指连续变化的量。常用的I/O分类如下： 开关量：按电压水平分，有220VAC、110VAC、24VDC，按隔离方式分，有继电器隔离和晶体管隔离。 模拟量：按信号类型分，有电流型（4-20mA,0-20mA）、电压型（0-10V,0-5V,-10-10V）等，按精度分，有12bit,14bit,16bit等。 除了上述通用IO外，还有特殊IO模块，如热电阻、热电偶、脉冲等模块。 按I/O点数确定模块规格及数量，I/O模块可多可少，但其大数受CPU所能管理的基本配置的能力，即受大的底板或机架槽数限制。APACHE 1/8IN THICK 3 PLY 175 IN LENGTH 30 IN WIDTH CONVEYOR BELT D443660
GATES LL8MGT-021 7MM PITCH TIMING BELT D320859
HABASIT FNB-5E ENDLESS 207IN 1-7/8 IN CONVEYOR BELT B382453
510DH 51 IN 1 IN 1/2 IN DOUBLE SIDED TIMING BELT D418545
GATES 2590-14MGT-85 POWERGRIP GT2 2590X85MM 14MM PITCH TIMING BELT D420171
FOTH PRODUCTION SOLUTIONS 3019458 VACUUM 114X1-1/2 IN BELT B333339
HABASIT CNB6EB ENDLESS FLEXPROOF 226 IN 10 IN CONVEYOR BELT B373952
HABASIT F5ENWT ENDLESS FLEXPROOF 20FT 28 IN CONVEYOR BELT B379733
IBT B3 WHITE RUBBER 31X2FT CONVEYOR BELT D294607
GATES CX210 214 IN 7/8 IN V-BELT BELT D443477
GOODYEAR B68 5L710 HY-T PLUS 68X21/32IN V-BELT D416427
REXNORD LF882TABK6 TABLETOP CHAIN CONVEYOR 120X6 IN BELT D352160
CALIFORNIA RUBBER 3-PLY PEBBLE TOP CONVEYOR 1200X8 IN BELT D352367
GATES 14MGT-1190-20 POLY CHAIN GT2 1190MM 20MM 14MM TIMING BELT D416752
GATES TP1250H150 TWIN POWER 125 X 1-1/2 X 1/2 TIMING BELT D409302
GATES AX48 TRI-POWER VEXTRA V80 50 IN 1/2 IN 1/4 IN V-BELT BELT B454149
GATES 5VX960 SUPER HC VEXTRA V80 V-BELT 96 X 5/8 IN BELT B357459
MOL BELTING TUT-2 CENTER GROOVE PLASTIC CONVEYOR 480X18IN BELT B257684
BANDO 2926V686 VARIBLE SPEED 68.6X1-13/16IN V-BELT BELT D402002
GOODYEAR 4430V910 VARIABLE SPEED 92X2-3/4IN V-BELT D412670
BRECOFLEX 32-AT10-1400 POLYURETHANE 32X1400MM TIMING BELT D216189
GATES 520J MICRO-V 50X7/8 IN BELT D394181
BROWNING BX116 GRIPNOTCH 117.8X5/8IN V-BELT BELT D385806
SPARKS POWER TRANSMISSION TOOTHED V-BELT 72-3/8X3 IN BELT B323912
GATES BX195 NOTCHED V-BELT 198X21/32IN D279770
GOODYEAR B40 5L430 HY-T PLUS MATCHMAKER 43 IN 2/3 IN V-BELT BELT B437266
3M 78-8017-9049-0 55 IN LONG 2 IN WIDE CONVEYOR DRIVE BELT D421216
GATES 5VX690 SUPER HC VEXTRA NOTCHED GRIP 69 IN 5/8 IN V-BELT BELT B430316
HABASIT CNB6EB FLEXPROOF ENDLESS WHITE CONVEYOR 80 X 3818MM BELT B363873
HABASIT NNT8EFWE FLEXPROOF CONVEYOR 65-2/3 X 1FT BELT B360883
GATES 210L050 POWERGRIP 21 IN 1/2 IN 3/8 IN TIMING BELT B418890
SHEFFER TUKT1016 16MM OPEN END TIMING 118X1/2 IN BELT B223927
GATES 322L075 POWERGRIP TIMING 32.2X3/4IN BELT D358079
GATES 570H075 POWERGRIP TIMING 57X3/4 IN BELT D316007
GATES B73 HI POWER II 76 IN 21/32IN V-BELT D415764
GATES 300XL037 POWERGRIP 30X3/8IN 1/5IN PITCH TIMING BELT D409147
GATES B50 HI-POWER II O&HR V80 9003-2050 53 IN 5/8 IN V-BELT BELT B417588
CONTITECH B261108 HTD 565 5M TIMING 22X3/4 IN BELT B269171
GATES B-89 HI-POWER II V80 V-BELT 92X2/3 IN BELT B364830
GOODYEAR B144 147 IN 21/32 IN V-BELT BELT B413024
MARKEM T2.5-230 230MM 10MM TIMING BELT D459123
DAYCO 660H200 TIMING 66X2 IN BELT D253577
BANDO 340DH150 DOUBLE SIDED TIMING 34X1-1/2 IN BELT D313501
AMMERAAL BELTECH 35000141 134-1/2 IN 1-1/2 IN 1/2 IN CONVEYOR BELT B464531
RELIANCE 57C435
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