6DD1600-0AJ0 *6DD1600-0AJ0 *
PLC可編程控制器的分類
1)按I/O點(diǎn)數(shù)分類
PLC所能接受的輸入信號(hào)個(gè)數(shù)和輸出信號(hào)個(gè)數(shù)分別稱為PLC的輸入點(diǎn)數(shù)和 輸出點(diǎn)數(shù)。其輸入、輸出點(diǎn)數(shù)的數(shù)目之和稱為PLC的輸入/輸出點(diǎn)數(shù),簡(jiǎn)稱I/O點(diǎn)數(shù)。I/O點(diǎn)數(shù)是選擇PLC的重要依據(jù)之一。
一般而言,PLC控制系統(tǒng)處理的I/O點(diǎn)數(shù)較多時(shí),則控制關(guān)系比較復(fù)雜,用戶要求的程序存儲(chǔ)器容量也較大,要求PLC指令及其他功能比較多。按PLC輸入、輸出點(diǎn)數(shù)的多少可將PLC分為以下三類。
(1)小型機(jī)
小型PLC輸入、輸出總點(diǎn)數(shù)一般在256點(diǎn)以下,用戶程序存儲(chǔ)器容量在4K字左右。小型PLC的功能一般以開關(guān)量控制為主,適合單機(jī)控制和小型控制系統(tǒng)。
(2)中型機(jī)
中型PLC的輸入、輸出總點(diǎn)數(shù)在256~2048點(diǎn)之間,用戶程序存儲(chǔ)器容量達(dá)到8K字左右。中型機(jī)適用于組成多機(jī)系統(tǒng)和大型控制系統(tǒng)。
手機(jī)
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鄭娟萍
廈門仲鑫航自動(dòng)化設(shè)備有限公司
(3) 大型機(jī)
大型PLC的輸入、輸出總點(diǎn)數(shù)載2084點(diǎn)以上,用戶程序存儲(chǔ)器容量達(dá)到16K字以上。大型機(jī)適用于組成分布式控制系統(tǒng)和整個(gè)工廠的集散控制網(wǎng)絡(luò)。
上述劃分沒有一個(gè)十分嚴(yán)格的界限,隨著PLC技術(shù)的飛速發(fā)展,一些小型PLC也具備中型或大型PLC的功能,這也是PLC的發(fā)展趨勢(shì)。
2)按結(jié)構(gòu)形式分類
按照PLC的結(jié)構(gòu)特點(diǎn)可分為整體式、模塊式兩大類。
(1)整體式結(jié)構(gòu)
把PLC的CPU、存儲(chǔ)器、輸入/輸出單元、電源等集成在一個(gè)基本單元中,其結(jié)構(gòu)經(jīng)湊,體積小,成本低,安裝方便。基本單元上設(shè)有擴(kuò)展端口,通過電纜與擴(kuò)展單元相連,可配接特殊功能模塊。微型和小型PLC一般為整體式結(jié)構(gòu),S7-200系列屬整體式結(jié)構(gòu)。
(2)模塊式結(jié)構(gòu)
模塊式結(jié)構(gòu)的PLC由一些模塊單元構(gòu)成,這些標(biāo)準(zhǔn)模塊包括CPU模塊、輸入模塊、輸出模塊、電源模塊和各種特殊功能模塊等,使用時(shí)將這些模塊插在標(biāo)準(zhǔn)機(jī)架內(nèi)即可。各模塊功能是獨(dú)立的,外形尺寸是統(tǒng)一的。模塊式PLC的硬件組態(tài)方便靈活,裝配和維修方便,易于擴(kuò)展。
目前,中、大型PLC多采用模塊式結(jié)構(gòu)形式,如西門子的S7-300和S7-400系列。
PENNY & GILES HLP350/SAI/450/8K LINEAR POTENTIOMETER ***NNB***
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DANFOSS 190Z221 TRANSMITTER ***NIB***
CARBONE EG367/J WV-1 CARBON BRUSH ***NNB***
METRIC 20B CHAIN MASTER LINK (LOT OF 8) ***NIB***
BANNER SMB46L/48747 MOUNTING BRACKET FOR SENSORS (LOT OF 2) ***NIB***
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MICRON/IMPERVITRAN B1K5BTZ13JKH TRANSFORMER 1.5KVA ****XLNT****
CUTLER HAMMER E57KYED117-5 CABLE ***NIB***
DINDUS 1030Y VALVE 24V (0.5-16BAR) ****XLNT****
MECMAN 551-221-000-2 VALVE ***NIB***
BUSSMANN 430P 2 POLE FUSE HOLDER ***NIB***
NUMATICS 11SAD4210 PNEUMATIC VALVES (SET OF 3) ***XLNT***
ARBURG 658 BOARD ASSEMBLY ***NIB***
SYMBOL OMNILINK LL-500-1200 INTERFACE CONTROLLER ***XLNT***
WORCESTER CONTROLS SERIES 47 INDICATOR ***NIB***
METTLER TOLEDO 363-DXK-S8/120 ELECTRODE ***NIB***
MANN FILTER HD613 FILTER ****NIB****
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AMP 413589-7 CRIMP HEIGHTS (LOT OF 5) ***NIB***
KENALL WCBU455093 WCBU-4-0/0-2/2-32-SB-2-277-1/7-1-FS BALLAST ***NNB***
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TECHNIFOR CN4-29/1S01-0740 PC BOARD ****XLNT****
SIGNET SCIENTIFIC PN P51442 PC BOARD WITH ENCLOSURE ***XLNT***
SIGNET 3-9759.101 PH ANALYZER (0-14) ****XLNT****
EMECANIQUE LR2 D1306 RELAY (LOT OF 4) ***XLNT***
EMECANIQUE LR2 D1305 RELAY (LOT OF 3) ***XLNT***
EMECANIQUE LP1 D09 10 CONTACT BLOCK (LOT OF 2) ***XLNT***
MAC VALVES PMC-111BAAA CONTROL VALVE ***XLNT***
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