描述
PLC硬件和軟件的進(jìn)展
PLC硬件和軟件的進(jìn)展，從系統(tǒng)上講是實(shí)現(xiàn)小型化、高速化，以及將信息技術(shù)滲入PLC；從硬件上講是，采用32位RISC的MPU、專用的LSI和多CPU；從軟件上講則是，采用與國(guó)際標(biāo)準(zhǔn)IEC 61131-3相對(duì)應(yīng)的日本工業(yè)標(biāo)準(zhǔn)JIS B 3503。小型化 由于日本電子工業(yè)尤以器件、電路板等硬件見(jiàn)長(zhǎng)，所以在PLC系統(tǒng)上實(shí)現(xiàn)小型化，可以說(shuō)最早就是起源于日本，又由他們來(lái)推動(dòng)，并一直樂(lè)此不疲、貫徹至今的。小型化的好處是：節(jié)省空間、安裝靈活、降低成本?，F(xiàn)今日本主要PLC廠商生產(chǎn)的模塊式中、大型PLC，其典型的外形尺寸要比他們?cè)谇耙淮耐惍a(chǎn)品的安裝空間要小50-60%。例如三菱電機(jī)的小Q系列就比AnS系列的安裝空間減少60%。要做到這一點(diǎn)，首先需要開(kāi)發(fā)大規(guī)模的專用集成電路芯片（ASIC）來(lái)減少芯片的個(gè)數(shù)，并采用球柵陣列（BGA）以保證在同樣封裝尺寸下能提供足夠多的針腳數(shù)。例如，某CPU模塊原來(lái)用了約700個(gè)元器件，通過(guò)開(kāi)發(fā)了12種大規(guī)模的ASIC（采用BG352的針腳封裝）和調(diào)整功能，減少了顯示用的LED和開(kāi)關(guān)等措施，使元器件減少了一半左右。其次，為減少接插件在印刷電路板上所占的空間，要求接插件的針腳間隔足夠小。再次，隨著微細(xì)加工技術(shù)的發(fā)展，印刷電路板上的接線布局可實(shí)現(xiàn)高密度化、多層化和薄型化，大大提高了元器件的安裝率。例如某CPU模塊采用了1毫米厚的基板制成8層電路板。由于采取了以上這些措施，使CPU模塊由3塊印刷電路板變?yōu)?塊，體積減少了70%，小型化得以較完美地實(shí)現(xiàn)。隨著小型化又產(chǎn)生了如何解決小空間的散熱設(shè)計(jì)問(wèn)題：一是要根據(jù)熱分析仿真來(lái)確定元器件的布置安排；二是主要元器件的電源電壓采用3.3V，達(dá)到低功耗的目的；三是考慮了通過(guò)安裝模塊的基板，使模塊所產(chǎn)生的熱量能得到良好散熱的機(jī)械結(jié)構(gòu)。高速化 所謂高速化應(yīng)該包括：運(yùn)算速度的高速化；與外部設(shè)備的數(shù)據(jù)交換速度高速化，如I/O刷新和網(wǎng)絡(luò)刷新等；編程設(shè)備服務(wù)處理的高速化；外部設(shè)備的高速響應(yīng)。
產(chǎn)品承諾：
保?證?全新原裝進(jìn)口,
保?證?安全準(zhǔn)時(shí)發(fā)貨，
保?證售后服務(wù)質(zhì)量，
優(yōu)勢(shì)價(jià)格，大量現(xiàn)貨。
主營(yíng)DCS系統(tǒng)配件
機(jī)器人系統(tǒng)配件
大型伺服系統(tǒng)配件
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HP Agilent E8408A VXI Mainframe + E8491B 89695B E1439A
ELGAR AT8000B PROGRAMMABLE DC POWER SYSTEM + SLAVE UNIT
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HP Agilent 54845A Infinium Oscilloscope 1.5GHz 8GSa 4CH
R&S SSCU-55 / ROHDE SCHWARZ TS8950 SIGNAL CONDITIONING
TEKTRONIX / SONY MTG100 MPEG-2 TRANSPORT GENERATOR
HP Agilent 8702B Lightwave Component Analyzer 3 GHz
ANRITSU MP1702A ERROR DETECTOR, 10 GHz, 512 KBIT
K&E 71-1111 OPTICAL MICROMETER + 71-1014 JIG TRANSIT
LECROY LC334A DIGITAL OSCILLOSCOPE 500 MHz 2 GS/s 4ch
YOKOGAWA DL1640L DIGITAL OSCILLOSCOPE 200MHz, 200MS/s
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OHAUS VOYAGER PRO ANALYTICAL LAB SCALE-BALANCE VP214CN
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Hughes 8010H Traveling Wave Tube Amplifier 4- 8 GHz TWT
TEKTRONIX TDS784A 4CH DIGITIZING OSCILLOSCOPE 1GHZ 4GSs
HP AGILENT 16700A Logic Analysis System *FULLY LOADED*
Hughes 8010H Traveling Wave Tube Amplifier 2- 4 GHz TWT
R&S SMHU 4.32 GHz Synthesized Signal Generator
ETS-Lindgren Holaday HI-4433-STE RF SURVEY METER KIT
MITUTOYO HEIGHTMATIC # 574-210 24″ / 600mm Digital Gage
INTEGRATED CONCEPTS IC-2000 PGA LEAD STRAIGHTENER 2020
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AGILENT HP N1025A 1GHz ACTIVE DIFFERENTIAL PROBE 1 GHz
AGILENT / HP E4406A VSA Transmitter Tester 4 GHz + BAF
PHILIPS (FLUKE) PM3585 / 60 LOGIC ANALYZER 64ch 200MHz
ROHDE SMHU 4.32 GHz SYNTHESIZED SIGNAL GENERATOR *R&S*
NOISECOM UFX9737 UFX SERIES 4 CH NOISE GENERATOR
HP 4333A DISTORTION ANALYZER
HP Agilent 4145A Semiconductor Paramter Analyzer DC M02
HP Agilent 75000 Series B E1301A VXI E1345 E1346 66201
HP Agilent 75000 Series B E1301A VXI w/ E1366A & E1326B
MAHR FEDERAL EMD-832-WI DIGITAL ELECTRONIC AMPLIFIER
FLUKE 5101A CALIBRATOR 50 Hz to 50 KHz
KIC SlimKic 2000 Thermal Temperature Profiler Card
KAVO EWL D-88299 MOTOR CONTROL + TYPE 950 SPINDLE PIECE
ANRITSU MG3671B Digital Modulation Signal Generator EXP
Expansion Units MG0301C, MG0303B, and MG0310A included!
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WR90 WAVEGUIDE 8.2 – 12.4 GHz (for ANRITSU / AGILENT)
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ANRITSU MN3650C DIGITAL MODULATOR 800MHz – 2.7 GHz
TEKTRONIX 7854 OSCILLOSCOPE w/ Opt 2D + AMP + TIME BASE
AEROFLEX / IFR / MARCONI 2024 SIGNAL GENERATOR *REPAIR*
ESI SR1050 SR-1050 HIGH RESISTENACE TRANSFER STANDARD
SYSTRON DONNER MODEL 110D PULSE GENERATOR 5 HZ – 50 MHZ
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BIRD 8890-315 Coaxial Termination Resistor + Blower
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AXCELIS / FUSION UV PROBE & METER MODEL # M150 / 200
ILX Lightwave Model LDT-5910B Temperature Controller
ROHDE & SCHWARZ NRVD DUAL POWER METER w/ OPT 01
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4 Slot Module w/ Dual Trace 7A24 + 7A26 + 7B80 + 7B92A
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15天包退換 一年質(zhì)保 大量現(xiàn)貨? 國(guó)內(nèi)實(shí)力庫(kù)存商家
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