PLC向高性能小型化方向發(fā)展。PLC的功能正越來(lái)越豐富,而體積則越來(lái)越小。比如三菱的FX-1S系列PLC,最小的機(jī)種,體積僅為60×90×75mm,相當(dāng)于一個(gè)繼電器,但卻具有高速計(jì)數(shù)、斜坡、交替輸出及16位四則運(yùn)算等能力,還具有可調(diào)電位器時(shí)間設(shè)定功能。PLC已不再是早期那種只能進(jìn)行開(kāi)關(guān)量邏輯運(yùn)算的產(chǎn)品了,而是具有越來(lái)越強(qiáng)的模擬量處理能力,以及其他過(guò)去只有在計(jì)算機(jī)上才能具有的高級(jí)處理能力,如浮點(diǎn)數(shù)運(yùn)算、PID調(diào)節(jié)、溫度控制、精確定位、步進(jìn)驅(qū)動(dòng)、報(bào)表統(tǒng)計(jì)等。從這種意義上說(shuō),PLC系統(tǒng)與DCS(集散控制系統(tǒng))的差別已經(jīng)越來(lái)越小了,用PLC同樣可以構(gòu)成一個(gè)過(guò)程控制系統(tǒng)。
PLC操作向簡(jiǎn)易化方向發(fā)展。目前PLC推廣的難度之一就是復(fù)雜的編程使得用戶(hù)望而卻步,而且不同廠(chǎng)商PLC所用編程的語(yǔ)言也不盡相同,用戶(hù)往往需要掌握多種編程語(yǔ)言,難度較大。PID控制、網(wǎng)絡(luò)通信、高速計(jì)數(shù)器、位置控制、數(shù)據(jù)記錄、配方和文本顯示器等編程和應(yīng)用也是PLC程序設(shè)計(jì)中的難點(diǎn),用普通的方法對(duì)它們編程時(shí),需要熟悉有關(guān)的特殊存儲(chǔ)器的意義,在編程時(shí)對(duì)它們賦值,運(yùn)行時(shí)通過(guò)訪(fǎng)問(wèn)它們來(lái)實(shí)現(xiàn)對(duì)應(yīng)的功能。這些程序往往還與中斷有關(guān),編程的過(guò)程既繁瑣又容易出錯(cuò),阻礙了PLC的進(jìn)一步推廣應(yīng)用。PLC的發(fā)展必然朝著操作簡(jiǎn)易化方向邁進(jìn),比如使用編程向?qū)Ш?jiǎn)化對(duì)復(fù)雜任務(wù)的編程,在這一點(diǎn)上西門(mén)子就充當(dāng)了先行者,西門(mén)子S7-200的編程軟件設(shè)計(jì)了大量的編程向?qū)?,只需要在?duì)話(huà)框中輸入一些參數(shù),就可以自動(dòng)生成包括中斷程序在內(nèi)的用戶(hù)程序,大大方便了用戶(hù)的使用。
13365-EN5 ALLEN BRADLEY
1326AB-C3E-11-A7-C5 ALLEN BRADLEY
A06B-0153-B175#7075 FANUC
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1200-2 UTICOR 2-LINE DISPLAY
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AS42CM-T SQUARE D POWERLINK CONTROL MODULE **NEW
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121-085-006 MODICON
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ETVS7-200-13-CTADS ATLAS COPCO
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3HEA505956/00 ABB
AS-P180-010 MODICON
AS-500P-000 MODICON
7300-AMBG2 ALLEN BRADLEY MODULE *1 YR WRTY*
630-C3E40 DVT SMART IMAGE SENSOR
MAC90C-0-KD-1-B/110-A-0/J1250/S01 INDRAMAT
A06B-6050-H005 FANUC DRIVE **REFURB**
4240-0702-00 ATLAS COPCO CONTROLLER
MDD-112C-N-030-N2L-130GA3 INDRAMAT
TDM1.2-30-300-W1-W0 INDRAMAT CONTROLLER **1YR WRTY**
AS-884A-311 MODICON
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A06B-6078-H206#500 FANUC *PLEASE CALL FOR LEAD-TIME*
A06B-0346-B256 FANUC *1 YR WARRANTY*
MDD090C-N-030-N2L-110GB0 INDRAMAT
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M804-8G00-4001 GOULD
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HDS03.2-W100N-HS45 INDRAMAT SERVO DRIVE*1YRWRTY*
A32DLJ1000100000 PACIFIC SCIENTIFIC
VK63-150/2 WEEKE-EMOD
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1FE1114-6WT11-1BC2 SIEMENS SPINDLE MOTOR *NEW*
MDD090C-N-040-N2M-110GR1 INDRAMAT
MDD090C-N-040-N2M-110GL1 INDRAMAT 1 YR WARR
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AS-984A-832 MODICON MODULE *1 YR WARR* OBSOLETE
DKC-21.3-40-7-FWI REXROTH *NEW IN BOX*
1391-DES15-DI-AQB ALLEN BRADLEY DRIVE *1YRWRTY*
DTS-2303-007 GII
MAC112C-0-HD-1-B/130-A-0/I01250/S005 INDRAMAT
1784-T30G ALLEN BRADLEY PLANT FLOOR TERMINAL
CACR-SR44SZ1SDY231 YASKAWA
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