YASKAWA SGMSV-20ADA21

?PLC在20世紀90年代已經(jīng)形成微、小、中、大、巨型多種PLC。按I/O點數(shù)分，可分為微型PLC（32I/O）、小型PLC（256I/O）、中型PLC（1024I/O）、大型PLC（4.69I/O）、巨型PLC（8195I/O）五種。

??? PLC與工業(yè)生產(chǎn)過程的聯(lián)系是通過I/O接口模塊來實現(xiàn)的。PLC有許多I/O接口模塊，包括開關量輸入模塊、開關量輸出模塊、模擬量輸入模塊、模擬量輸出模塊以及其他一些特殊模塊，使用時應根據(jù)它們的特點進行選擇。

????（一）確定I/O點數(shù)

????根據(jù)控制系統(tǒng)的要求確定所需要的I/O點數(shù)時，應再增加?10%～20%的備用量，以便隨時增加控制功能。對于一個控制對象，由于采用的控制方法不同或編程水平不同，I/O點數(shù)也應有所不同。表2列出了典型傳動設備及常用電氣元件所需的開關量的I/O點數(shù)。

（二）開關量I/O

????開關量I/O接口可從傳感器和開關（如按鈕、限位開關等）及控制設備（如指示燈、報警器、電動機起動器等）接收信號。典型的交流輸入/輸出信號為24～240V，直流輸入/輸出信號為5～240V。盡管輸入電路因制造廠家不同而不同，但有些特性是相同的，如用于消除錯誤信號的抖動電路等。此外，大多數(shù)輸入電路在高壓電源輸入和接口電路的控制邏輯部分之間都設有可選的隔離電路。在評估離散輸出時，應考慮熔絲、瞬時浪涌保護和電源與邏輯電路間的隔離電路。熔絲電路也許在開始時花費較多，但可能比在外部安裝熔絲耗資要少。

NEW 80B25 1-5/16IN BORE SINGLE ROW CHAIN SPROCKET D402545
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NEW MARTIN 50BS19 1 SINGLE ROW 1IN BORE CHAIN SPROCKET D369512
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NEW IJ WHITE 18TOOTH 6-5/8IN OD 1-7/16IN ID SINGLE ROW CHAIN SPROCKET D503885
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NEW TSUBAKI H50B22 UST CHAIN SINGLE ROW 1IN BORE SPROCKET D331398
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NEW DETROIT HOIST & CRANE 400-2799 21 TOOTH 3/4 IN BORE GEAR SPROCKET D218266
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NEW MARTIN 50BS13 13 TOOTH STEEL CHAIN SINGLE ROW 1-1/4IN BORE SPROCKET D317571
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NEW MARTIN 50BS16 1-1/4 SINGLE ROW CHAIN SPROCKET D414814
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NEW MARTIN 50BS17 1 1IN BORE SINGLE ROW CHAIN SPROCKET D415159
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NEW MARTIN 50BS16HT 1-1/2 16 TOOTH CHAIN SINGLE ROW 1-1/2 IN SPROCKET D264188
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NEW MARTIN 60A25 FLAT CHAIN SINGLE ROW 3/4IN ROUGH BORE SPROCKET D259768
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NEW MARTIN 35BS13HT 1/2 CHAIN SINGLE ROW 1/2IN BORE SPROCKET D312015
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NEW PSC 456622 ASSEMBLY SINGLE ROW 1-11/16IN BORE SPROCKET D308374
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NEW MARTIN 41BS13 1/2IN ROUGH BORE 13 TOOTH CHAIN SINGLE ROW SPROCKET D264103
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NEW MARTIN 100B8 1 IN SINGLE ROW CHAIN SPROCKET D404840
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NEW REXNORD NS850025T1KWSS 1-1/4 IN SINGLE ROW CONVEYOR CHAIN SPROCKET D417007
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NEW MARTIN 40BS29 29 TOOTH STEEL CHAIN SINGLE ROW 1-1/4IN BORE SPROCKET D251611
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NEW MARTIN 50B21 ROLLER CHAIN SINGLE ROW 1-3/4 IN BORE SPROCKET B256663
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NEW INTRALOX 41PD 104MM PD 1-1/2 IN SINGLE ROW CONVEYOR SPROCKET D507806
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NEW DODGE RELIANCE 100502 40BTL16H 1008 CHAIN 1-1/4IN BORE SPROCKET D286328
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NEW SANDIACRE 555R7066S3 MOTO 24 TOOTH CHAIN SINGLE ROW 1IN ID SPROCKET D276468
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NEW MARTIN 50C15 15 TOOTH CHAIN SINGLE ROW 5/8IN ROUGH BORE SPROCKET D262051
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SIG 54-526-464-2 GEAR ASSEMBLY 1-5/8 IN DOUBLE ROW CHAIN SPROCKET B377116
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NEW MARTIN 35B15 BORE 1/2 IN SINGLE ROW CHAIN SPROCKET D417530
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NEW MARTIN 100B16 16 TEETH CHAIN SINGLE ROW 2-3/4 IN SPROCKET B267555
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NEW PSC 211162 27TOOTH CHAIN SINGLE ROW 2-1/8 IN SPROCKET D301450
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NEW MARTIN 40BTB28 1610 5/8 IN SINGLE ROW CHAIN SPROCKET D499824
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NEW MARTIN 50B24SS STAINLESS 3/4 IN BORE SINGLE ROW CHAIN SPROCKET D434789
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NEW MARTIN 50B14 14 TOOTH 5/8 IN SINGLE ROW CHAIN SPROCKET B435993
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NEW MARTIN E35B18H CHAIN TRIPLE ROW 1 IN SPROCKET D330985


NEW MARTIN 50BS28 1 3/16 BORE 1-3/16 IN SINGLE ROW CHAIN SPROCKET D416137
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NEW TB WOODS W4414M42 7/8-3-1/2IN BORE 44TEETH QD CHAIN SPROCKET D232869
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NEW MARTIN 1260A20 20TOOTH STEEL CHAIN SINGLE ROW 1IN BORE SPROCKET D302448
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NEW MARTIN D80B 15 TOOTH 5-1/8IN OD CHAIN DOUBLE ROW 2-7/16 IN SPROCKET D246439
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NEW INTRALOX S1100 12 TOOTH 1IN SQUARE BORE SINGLE ROW CHAIN SPROCKET D424349
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NEW MAC EQUIPMENT 35BS26 3/4 CHAIN SINGLE ROW 3/4 IN SPROCKET D256994
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NEW ARPAC 101693 24TOOTH STEEL QD BORE CHAIN SINGLE ROW 3-3/8IN SPROCKET D311975
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NEW MARTIN 40BS16HT 1 IN SINGLE ROW CHAIN SPROCKET D508923
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NEW MARTIN 140BTB17 3020 2-3/4 IN SINGLE ROW CHAIN SPROCKET D501012
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MARTIN 35BS28 5/8 SINGLE ROW CHAIN 1IN SPROCKET D401253
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NEW 25 TOOTH CHAIN SINGLE ROW 3/4IN ID 5-5/16IN OD SPROCKET D330773
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NEW 11 14 015 1-3/16 IN BORE SINGLE ROW CHAIN SPROCKET D434829
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NEW 40-42 42 TEETH SABERTOOTH CHAIN SINGLE ROW 1 IN SPROCKET B288865
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NEW MARTIN 50BS24HT STEEL CHAIN SINGLE ROW 1-1/8IN BORE SPROCKET D347952
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NEW MARTIN 35B32 STEEL CHAIN SINGLE ROW SPROCKET D315329
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NEW MEADWESTVACO 02-059351-0024-?1 24 TOOTH CHAIN 2-1/4 IN SPROCKET D309590
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NEW 435A20 3/4 IN ROUGH BORE SINGLE ROW CHAIN SPROCKET D404726
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NEW MARTIN 50B16 CHAIN SINGLE ROW 1 IN SPROCKET D337034
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NEW DODGE 50BTL35 BUSHED TAPER 2012 CHAIN SINGLE ROW SPROCKET D302608
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NEW MARTIN P728M85-SF HTS TIMING 3 IN SINGLE ROW BELT SPROCKET B410864
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NEW MARTIN 50B11 11 TOOTH STANDARD BORE 5/8 IN SINGLE ROW CHAIN SPROCKET B491407
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BALDWIN 12T 5/8P STEEL 12 TOOTH IDLER GEAR CHAIN SINGLE 3/4IN SPROCKET B288893
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NEW MARTIN 60BS16 1-1/8 1-1/8 IN ID SINGLE ROW CHAIN SPROCKET D445035
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NEW MARTIN 40BS26 3/4 3/4 IN BORE SINGLE ROW CHAIN SPROCKET D428575
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NEW TSUBAKI 60 32 SINGLE ROW 2-3/16 IN SPROCKET D241896
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NEW AEROGLIDE F201967 TYPE B 13TOOTH CHAIN SINGLE ROW 1-1/4 IN SPROCKET D353527
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NEW TB WOODS P112-5M-15-SDS SINGLE ROW 2-1/8IN BORE DRIVE SPROCKET D332926
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NEW MARTIN 50BS16 3/4 CHAIN SINGLE ROW 3/4IN BORE SPROCKET D274223
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NEW MARTIN 25B40 STEEL CHAIN SINGLE ROW 1-15/16 IN SPROCKET D268669
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NEW 60A50 50 TOOTH ROUGH BORE CHAIN SINGLE ROW 4-1/4IN BORE SPROCKET D324017
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NEW MARTIN D08B26 3/4 IN DOUBLE ROW CHAIN SPROCKET B377038
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NEW MARTIN 50BS26 1-1/4IN BORE SINGLE ROW CHAIN SPROCKET D401839
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NEW PSC 132X2260 36TOOTH STOCK BORE CHAIN DOUBLE ROW 1-3/4 IN SPROCKET D301752
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NEW MARTIN 60BS22 1 22 TOOTH CHAIN SINGLE ROW 1 IN SPROCKET D302868
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NEW INCOM 60A20 CHAIN SINGLE ROW 1 IN IDLER SPROCKET D305454
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NEW MARTIN 2040B21 STEEL 5/8 IN SINGLE ROW CHAIN SPROCKET D508702
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NEW TB WOODS W56-8M-22-SDS W568M22 POWERCHAIN SPROCKET D317648
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NEW TSUBAKI H60B18 CHAIN SINGLE ROW 1-1/4IN ID SPROCKET D364413
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NEW MARTIN 50B11 SINGLE ROW CHAIN SPROCKET D433845
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NEW MARTIN 120B14 14 TOOTH CHAIN SINGLE ROW 3-1/8 IN SPROCKET D268394
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NEW 456845 60 TOOTH STEEL CHAIN SINGLE 4-1/2IN BORE 19-1/2IN OD SPROCKET D319585
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NEW MARTIN 50B20SS STAINLESS STEEL CHAIN SPROCKET 1-3/16 IN BORE D214028
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NEW MARTIN 35BS14 3/4 CHAIN SINGLE ROW 3/4IN BORE SPROCKET D337699
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BABBITT SIZE 0 1/2IN BORE SINGLE ROW CHAIN WHEEL ADJUSTING SPROCKET D395904
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NEW MARTIN D35B18H 1/2IN ROUGH BORE DOUBLE ROW CHAIN SPROCKET D387745
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NEW BREWER MACHINE 35B13U 1/2 IN BORE SINGLE ROW CHAIN IDLER SPROCKET D434816
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NEW MARTIN 80B36 36TOOTH CHAIN SINGLE ROW 1-3/16 IN SPROCKET D341046
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NEW MARTIN 60BS32 1 32 TOOTH CHAIN SINGLE ROW 1 IN SPROCKET D303256

NEW INTRALOX 4MM PD 41 PD SQUARE BORE 41MM SINGLE ROW CHAIN SPROCKET D445311