AB 1746-NT4
1.向高速度、大容量方向發(fā)展
為了提高PLC的處理能力,要求PLC具有更好的響應(yīng)速度和更大的存儲(chǔ)容量。目前,有的PLC的掃描速度可達(dá)0.1ms/k步左右。PLC的掃描速度已成為很重要的一個(gè)性能指標(biāo)。
在存儲(chǔ)容量方面,有的PLCzui高可達(dá)幾十兆字節(jié)。為了擴(kuò)大存儲(chǔ)容量,有的公司已使用了磁泡存儲(chǔ)器或硬盤。
2.向超大型、超小型兩個(gè)方向發(fā)展
當(dāng)前中小型PLC比較多,為了適應(yīng)市場(chǎng)的多種需要,今后PLC要向多品種方向發(fā)展,特別是向超大型和超小型兩個(gè)方向發(fā)展。現(xiàn)已有I/O點(diǎn)數(shù)達(dá)14336點(diǎn)的超大型PLC,其使用32位微處理器,多CPU并行工作和大容量存儲(chǔ)器,功能強(qiáng)。
小型PLC由整體結(jié)構(gòu)向小型模塊化結(jié)構(gòu)發(fā)展,使配置更加靈活,為了市場(chǎng)需要已開(kāi)發(fā)了各種簡(jiǎn)易、經(jīng)濟(jì)的超小型微型PLC,zui小配置的I/O點(diǎn)數(shù)為8~16點(diǎn),以適應(yīng)單機(jī)及小型自動(dòng)控制的需要
廈門莫格電氣自動(dòng)化有限公司
:張 美 霞
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3.PLC大力開(kāi)發(fā)智能模塊,加強(qiáng)聯(lián)網(wǎng)通信能力
為滿足各種自動(dòng)化控制系統(tǒng)的要求,近年來(lái)不斷開(kāi)發(fā)出許多功能模塊,如高速計(jì)數(shù)模塊、溫度控制模塊、遠(yuǎn)程I/O模塊、通信和人機(jī)接口模塊等。這些帶CPU和存儲(chǔ)器的智能I/O模塊,既擴(kuò)展了PLC功能,又使用靈活方便,擴(kuò)大了PLC應(yīng)用范圍。
加強(qiáng)PLC聯(lián)網(wǎng)通信的能力,是PLC技術(shù)進(jìn)步的潮流。PLC的聯(lián)網(wǎng)通信有兩類:一類是PLC之間聯(lián)網(wǎng)通信,各PLC生產(chǎn)廠家都有自己的專有聯(lián)網(wǎng)手段;另一類是PLC與計(jì)算機(jī)之間的聯(lián)網(wǎng)通信,一般PLC都有通信模塊與計(jì)算機(jī)通信。為了加強(qiáng)聯(lián)網(wǎng)通信能力,PLC生產(chǎn)廠家之間也在協(xié)商制訂通用的通信標(biāo)準(zhǔn),以構(gòu)成更大的網(wǎng)絡(luò)系統(tǒng),PLC已成為集散控制系統(tǒng)(DCS)*的重要組成部分。
4.增強(qiáng)外部故障的檢測(cè)與處理能力
根據(jù)統(tǒng)計(jì)資料表明:在PLC控制系統(tǒng)的故障中,CPU占5%,I/O接口占15%,輸入設(shè)備占45%,輸出設(shè)備占30%,線路占5%。前二項(xiàng)共20%故障屬于PLC的內(nèi)部故障,它可通過(guò)PLC本身的軟、硬件實(shí)現(xiàn)檢測(cè)、處理;而其余80%的故障屬于PLC的外部故障。因此,PLC生產(chǎn)廠家都致力于研制、發(fā)展用于檢測(cè)外部故障的智能模塊,進(jìn)一步提高系統(tǒng)的可靠性。
5.編程語(yǔ)言多樣化
在PLC系統(tǒng)結(jié)構(gòu)不斷發(fā)展的同時(shí),PLC的編程語(yǔ)言也越來(lái)越豐富,功能也不斷提高。除了大多數(shù)PLC使用的梯形圖語(yǔ)言外,為了適應(yīng)各種控制要求,出現(xiàn)了面向順序控制的步進(jìn)編程語(yǔ)言、面向過(guò)程控制的流程圖語(yǔ)言、與計(jì)算機(jī)兼容的高級(jí)語(yǔ)言(BASIC、C語(yǔ)言等)等。多種編程語(yǔ)言的并存、互補(bǔ)與發(fā)展是PLC進(jìn)步的一種趨勢(shì)。
FARRAND 51 & 1/2" O.A.L. TAPE SPAR LINEAR SCALE 218052-15-1038
TOL-O-MATIC B3W LINEAR BELT DRIVE ACTUATOR WITH MOTOR, NNB
NSK 80" O.A.L. LINEAR BALL SCREW W5016-1987-C5Z 05L5-0005
INA LINEAR BEARING PR 14032 GR3, NIB
54" O.A.L. PRECISION BALL SCREW M-127
THOMSON ROUND LINEAR CASE SHAFT 25MMSOFTX1500MM?, NIB
THK CAM FOLLOWER CFH12MA / 350910 A NIB
THREAD CRAFT INC T-4073 COMMERCIAL BACKLASH BALL SCREW 50 OAL 2? DIA NIB
THOMSON ISO 9000 SUPER PILLOW BLOCK BEARING NIB SPB160PN
SAGINAW 31" LENGTH 3" DIAMETER SHAFT BALL SCREW, NO LABEL, SEE PHOTOS
LEAD SCREWS INTERNATIonAL 40" O.A.L. PRECISION BALL SCREW M447
THK 92" O.A.L. LINEAR MOTION SYSTEM YS 7F27
THREAD CRAFT INC T-6235 COMMERCIAL BACKLASH BALL SCREW 58 OAL 51 TRAV 2? DIA NIB
STAR 83.5" 28-HOLE LINEAR GUIDE RAIL 48-10-1608, RUST
94" O.A.L. PRECISION BALL SCREW C-246
DEUTSCHE STAR RUNNER BLOCK / ROLLER RAIL 1853-613-10, SEALED
20TH CENTURY MACHINE 120" O.A.L. PRECISION BALL SCREW FS-127920-2000
THOMSON A162536 LINEAR BALL BEARING, NNB
PRECISION BALL SCREW 74" O.A.L. FS127920-0800-1?268-02H1
GEORG FISCHER DOUBLE ACTING ACTUATOR
LINEAR ROLLER BEARING LMUWF16
NUMATICCS, LINEAR ACTUATOR SH10606LB16DS3, K13409
PARKER PNEUMATIC ACUATOR VAVLE P5T-J063DHSN050 SEALED
THK KS PRECISION BALLSCREW 9D22
THK LINEAR GUIDE RAIL NIB SHS35C3SS+840L / UCG00264 101075
THK HSR55 LINEAR BLOCK BEARING
STAR LINEAR BEARING 067-20
THK LINEAR GUIDE BLOCK NIB HSR45CA1SSS(GK) 101815
DUFF-NORTON WORM GEAR ACTUATOR LM3704-57L W/ STEARNS BRAKE 1-055-511-04-BQ?F
THREAD CRAFT INC T-1161 COMMERCIAL BACKLASH BALL SCREW 40 OAL 37 TRAV 2? DIA NIB
40" O.A.L. PRECISION BALL SCREW 89988
PARKER ORIGA SYSTEM PLUS PNEUMATIC DRIVE CYLINDER P5P00000C500-03?353 102624
DR. JOHANNES HEIDENHAIN 1840MM LINEAR ENCODER 216 750 HL
BELOIT CORP. SCREW JACK 274815D051
LINMOT LINEAR GUIDE PS01-48X240 / 0150-1975 *PLUG*
NIPPON THOMPSON IKO LINEAR BEARING, LRW50 E71
HYTORK-130 ACTUATOR 120PSIG
FESTO 12 MM BORE, 270° ANGLE ROTARY ACTUATOR DSM-12-270-P-FW?-CC
REXROTH LINEAR SLIDE BEARING R182443110
INA LINEAR MOTION BEARING KH1026/P/PP
EMCOR 36" O.A.L. PRECISION BALL SCREW E-6428
INA LINEAR BEARING KH3050IPIPP
EMCOR E-6696 58" PRECISION BALL SCREW
EMCOR 42" O.A.L. PRECISION BALL SCREW C-066
PARKER ORIGA SYSTEM PNEUMATIC LINEAR DRIVE SYSTEM 102629
THK 171&11/16" O.A.L. 55 HOLE LINEAR GUIDE WAY RAIL W/ (2) IKO BEARING BLOCK
BELOIT CORP. 15-TON SCREW JACK 274817D023-0-00?4
ACCUGLIDE CG35CEAN LINEAR BLOCK BEARING, NIB
NB LINEAR BEARING TWA-16UU
26" O.A.L. PRECISION BALL SCREW 052243
THOMSON ACCUGLIDE RG25NL0260 348660-81 LINEAR RAIL, NNB
FESTO DGP LINEAR DRIVE DGP-40-1300PPVA?B-SL010179
THREAD CRAFT INC T-8310 COMMERCIAL BACKLASH BALL SCREW 50 OAL 44 TRAV NIB
STAR / REXROTH 1807-203-31 236MM LINEAR ROLLER GUIDE RAIL, NNB
STAR / REXROTH 1807-203-31 LINEAR ROLLER GUIDE RAIL, NNB
THREAD CRAFT 39.55" 1.5 DIAMETER PRECISION BALL SCREW T-4947
36.562" O.A.L. PRECISION BALL SCREW 80198 / C-160
THOMSON SAGINAW 17.5" PRECISION BALL SCREW A-5409
THREAD CRAFT INC T-1284 PRECISION PRELOADED BALL SCREW 41 OAL 38 TRAV NIB
BARNES INDUSTRIAL BWO35342 120694 25?" BALLSCREW, NIB
PRECISION BALL SCREW 70260 NIB
THREAD CRAFT PRECISION BALL SCREW ?-16988
BELOIT CORP. SCREW JACK 274822D026
42" O.A.L. PRECISION BALL SCREW C-270
48" O.A.L. PRECISION BALL SCREW A-60292
STAR / REXROTH 1807-203-31 356MM LINEAR ROLLER GUIDE RAIL, NIB
THREAD CRAFT INC T-2569 COMMERCIAL BACKLASH BALL SCREW 38 OAL 30 TRAV NIB
THK LINEAR GUIDE RAIL NIB SHS-800L(GK) / UCG02891 101077
44'' LINEAR GUIDE RAIL
THOMSON INDUSTRIES, INC SUPERSLIDE SYSTEMS POSITIonING SLIDE, 37" OAL; 32" TRAV
REXROTH STAR RUNNER BLOCK/ BALL RAIL 1623-214-20 NIB
THOMPSON SUPER 24 BALL BEARING LINEAR BUSHING NIB
20TH CENTURY MACHINE 104" O.A.L. PRECISION BALL SCREW FS127920-1600
DAYTRonIC LINEAR SENSOR DS6000A
THREAD CRAFT INC T-4013 COMMERCIAL BACKLASH BALL SCREW 38 OAL 29 TRAV NIB
THREAD CRAFT INC T-5736 COMMERCIAL BACKLASH BALL SCREW 48? OAL 45? TRAV NIB
CAIPO DIS 10292 35 X 30 SCREW ACTUATOR
BELOIT CORP. SCREW JACK 274817D023-0-00?5
THREAD CRAFT T7425 74" O.A.L. PRECISION BALL SCREW CP#2.25X500x74
THREAD CRAFT INC T-1526 COMMERCIAL BACKLASH BALL SCREW 49 OAL 42 TRAV NIB
THREAD CRAFT INC T-6235 COMMERCIAL BACKLASH BALL SCREW 49 OAL 42 TRAV NIB
1244.5MM O.A.L. PRECISION BALL SCREW C-264
IKO 13-HOLE LINEAR GUIDE RAILWAY LWH 55 101018
IAI SINGLE AXIS ROBOT LINEAR ACTUATOR ISA-SXM-0-0-100?0-AQ
EMCOR 47.812" O.A.L. PRECISION BALL SCREW E-6630
FESTO 63MM BORE 500MM STROKE LINEAR DRIVE DGP-63-500-PPVA?-B
HEIDENHAIN 620MM, LINEAR SCALE LS 704
TEMPOSonIC R SERIES LINEAR-POSITION SENSOR RHT0065UD601V01
INGERSOLL-RAND ARO 1/4 TON SERIES 7700 ROLLER CHAIN HOIST 7718E-2C10-C6S
INGERSOLL-RAND ARO 1/4 TON SERIES 7700 ROLLER CHAIN HOIST 7718E-2C10-K6
IDEAL .69-1.25D, SAE SIZE 12, CLAMP 62M12, BOX OF 10 *NEW*
AEROQUIP HOSE CUT OFF MACHINE S1104-2-1
TSUBAKI 3/4" PITCH 10FT RIVETED ROLLER CHAIN, NO. 60 *NEW*
CAMPBELL 1/4" (6MM) WIRE ROPE CLIPS, B7670439 *NEW LOT OF 5*
GALVANIZED WIRE ROPE CABLE, 3/8" 7 X 19, PARTIAL ROLL
CREFORM 200 X 42 SWIVEL CASTER W/ STOP & POLYURETHANE WHEEL, J-200S, LOT OF 2