YASKAWA SGDM-75ADA

?PLC在20世紀(jì)90年代已經(jīng)形成微、小、中、大、巨型多種PLC。按I/O點(diǎn)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(guò)程的聯(lián)系是通過(guò)I/O接口模塊來(lái)實(shí)現(xiàn)的。PLC有許多I/O接口模塊，包括開關(guān)量輸入模塊、開關(guān)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(shí)應(yīng)根據(jù)它們的特點(diǎn)進(jìn)行選擇。

????（一）確定I/O點(diǎn)數(shù)

????根據(jù)控制系統(tǒng)的要求確定所需要的I/O點(diǎn)數(shù)時(shí)，應(yīng)再增加?10%～20%的備用量，以便隨時(shí)增加控制功能。對(duì)于一個(gè)控制對(duì)象，由于采用的控制方法不同或編程水平不同，I/O點(diǎn)數(shù)也應(yīng)有所不同。表2列出了典型傳動(dòng)設(shè)備及常用電氣元件所需的開關(guān)量的I/O點(diǎn)數(shù)。

（二）開關(guān)量I/O

????開關(guān)量I/O接口可從傳感器和開關(guān)（如按鈕、限位開關(guān)等）及控制設(shè)備（如指示燈、報(bào)警器、電動(dòng)機(jī)起動(dòng)器等）接收信號(hào)。典型的交流輸入/輸出信號(hào)為24～240V，直流輸入/輸出信號(hào)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(cuò)誤信號(hào)的抖動(dòng)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(shè)有可選的隔離電路。在評(píng)估離散輸出時(shí)，應(yīng)考慮熔絲、瞬時(shí)浪涌保護(hù)和電源與邏輯電路間的隔離電路。熔絲電路也許在開始時(shí)花費(fèi)較多，但可能比在外部安裝熔絲耗資要少。

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NEW MARTIN 50B24SS STAINLESS 3/4 IN BORE SINGLE ROW CHAIN SPROCKET D434789
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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 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 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 MARTIN 35BS14 3/4 CHAIN SINGLE ROW 3/4IN BORE SPROCKET D337699
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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