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plc控制系統(tǒng)可以由整體式PLC或模塊式PLC組成兩種。整體式PLC的I/O和CPU同一塊印刷電路板上，構造緊湊、體積小、價格低廉，小型PLC控制系統(tǒng)大多選用整體式PLC。模塊式PLC控制系統(tǒng)能輕松擴展功用、便利增減I/O點數(shù)，修理替換便利、判別與處理毛病敏捷。因而功用要求需求較高的控制系統(tǒng)一般選用模塊式PLC,這是目前運用最廣泛的PLC控制系統(tǒng)。
PLC控制系統(tǒng)用戶存貯器
一般PLC控制系統(tǒng)都用CMOS RAM作用戶存貯器，它具有靜態(tài)消耗電流小(1/A)的特征。為了在停電時保護用戶程序和現(xiàn)場數(shù)據(jù)，PLC一般用鋰電池作后備電源。
若被控系統(tǒng)的工藝需求固定不變、PLC所編程序已完善且不需批改，為了防止技術保密或人為改動PLC程序，可選用EPROM(選購件)將用戶程序固化。
PLC控制系統(tǒng)通訊聯(lián)網(wǎng)功用
大部分小型PLC自動控制系統(tǒng)為單機自動化，滿足功用需求即可，可以不選用上位計算機通訊接口。
若用戶需求將PLC自動控制系統(tǒng)歸入工廠自動化控制網(wǎng)絡，應選用帶有通訊接口的PLC自動控制系統(tǒng)。一般大型PLC自動控制系統(tǒng)和中型PLC自動控制系統(tǒng)都具有通訊功用。
目前一些高性能的小型機也帶有通訊接口，PLC控制系統(tǒng)通過RS-232串行接口，與上位計算機或另一臺PLC自動控制系統(tǒng)相連，還可以連接打印機等外部設備。
以上介紹了PLC控制系統(tǒng)PLC結構、PLC存貯器和PLC通訊接口幾個常識，實踐運用PLC時應根據(jù)用戶需求，概括考慮各種因素，選擇性能價格比適合的產(chǎn)品，使被控方針的控制需求得到完全滿足，也使PLC自動控制系統(tǒng)的功用得到充分發(fā)揮。
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Moog Portable Servo Valve Analyzer/Tester
Moog Proportional Valve D645-403/ D631-389C Rebuilt
Moog Flight Simulator Valve 728-003E NEW 13 Mo Warranty
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Moog Atchley 211A-630 Servo Valve New w/Warranty
Moog D651-129B Servo Valve Rebuilt 12 Mo Warranty
MOOG Servo Valve 72-102
MOOG D664-353N HYDRAULIC SERVO-PROPORTIONAL VALVE
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Moog Flight Simulator Valve 35S020 Rebuilt w/Warranty
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Moog Servo Valve D-7030 73-743 D102 Rebuilt
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Moog D633 Series Direct Drive Servo-Proportional Valve
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MOOG SERVO VALVE J661-709
Planet Products Hydraulic Motor MV.93 With Moog Valve
Moog Torque Motor for 62 Series Valve~Rebuilt~NR!
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MOOG Servo Valve 076-103A
Globe valve MOOG-CARLTON Oxygen Clean
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Moog Valve Control Card D646Z127 D123 075 A013 NIB
MOOG HYDROLUX VALVE WES22P10C1SBN1
Moog WES22P10C1SBN1 HYDRAULIC VALVE
MOOG HYDRAULIC SERVO VALVE MODEL# 31-236
MOOG HYDRAULIC SERVO TRANSFER VALVE MODEL# 533
Moog Hydrolux Hydraulic Flow Control Valve XDB10625-000
