TC-PRR021
TC-PRR021
莫格電氣自動(dòng)化提供DCS PLC備件,產(chǎn)品服務(wù)于用戶安裝的控制系統(tǒng)(集散控制系統(tǒng),可編程控制器,面板控制器和驅(qū)動(dòng)器),在供應(yīng)超過(guò)65個(gè)不同的國(guó)家。
以“專業(yè)、 誠(chéng)信、創(chuàng)新、合作、共贏”的經(jīng)營(yíng)理念、不斷開(kāi)發(fā)新產(chǎn)品、為客戶提供優(yōu)質(zhì)服務(wù)、以大限度追求客戶滿意、并不斷開(kāi)拓新領(lǐng)域業(yè)務(wù)。
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:祖巧麗
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軟PLC分為編譯和解釋兩種實(shí)現(xiàn)方式,其中解釋型有點(diǎn)像早期的大型機(jī)一樣,是基于一個(gè)虛擬機(jī)的,程序由一些偽代碼組成,工程師在上位機(jī)編好程后通過(guò)編譯器轉(zhuǎn)換為這種的偽代碼下載到PLC內(nèi)。運(yùn)行時(shí)虛擬機(jī)掃描并解釋這些指令運(yùn)行,這樣的實(shí)現(xiàn)方式使工程人員編的T型圖之類的與底下PLC的軟件平臺(tái)無(wú)關(guān),保證了PLC核心的獨(dú)立性,同時(shí)它能很好的擴(kuò)展軟件和功能塊而不受硬件環(huán)境的影響,但這種方式是zui慢的一種方式。
軟PLC還有一種是編譯方式,編譯方式是將各種IEC指令轉(zhuǎn)換為匯編或者C語(yǔ)言,再將其插入到一個(gè)框架代碼內(nèi)調(diào)用C或匯編編譯器生成真正的CPU指令。
MASONEILAN DRESSER 4" POSITIONER VALVE 33-34625 104168
ALCON 120V, 60Hz, 112PSI, 176oF GENERAL PURPOSE VALVE V3-31-21-12
NUMATICS 14.5-145PSIG-AI?R, SOLENOID VALVE 134JJ600O00000 *NEW,SEALED*
BONNEY FORGE 1/2" 800 GATE VALVE A105N CR13 / 087743-*002 99178
NUMATICS 232PSIG 16BAR SOLENOID VALVE I22BB600R061D61 *NEW, SEALED*
GRACO * VALVE * C10A
ALCO SOLENOID COIL XA1702-9 NEW IN BOX
VERSA SOLENOID VALVE 2 POSITION
FIVE STAR SEAL SERIES 84 FLUID SEAL 4-3/4" 316SS 84-38SV NIB
NUMATICS FLOW CONTROL VALVE TM0-2001 *NEW*
VELAN SS316 CLASS 150 CWP SIZE 12 KNIFE GATE VALVE L180320C-13BL
JAMESBURY BALL VALVE 08266026J VPVL051 SR4/5 BLT FO C
FESTO 16BAR BRANCHING MODULE FRM-H-D-MINI
BRAY DOUBLE ACTION PNEUMATIC ACTUATOR 90-0830-21320-5?32 W/ SAUNDERS 3" VALVE
JAMESBURY 4" VALVE 5150 313600TT ACTUATOR ST-200 B W/ PMV POSITIONER P-2000
ASCO * RED HAT SOLENOID VALVE NIB * 8320G176
UNKNOWN MANUFACTURER * 90 STAINLESS ELBOW * 1-150
ITT ENGINEERED VALVES FABRI-VALVE 150CWP 14" KNIFE GATE VALVE C37S316
SOLENOID VALVE COIL, 27-462-2 D
NUMATICS 24VDC .20A 150 PSIG-AIR DBL SOLENOID VALVE W/ BASE, A13BB515RT47R *NEW*
PARKER 110/120V .28/.35A 3000 PSI DIRECTIONAL CONTROL VALVE, D1W20B-Y-31-FN
FISHER CASCADE AUTOMATION VALVE POSITIONER SERIES 3600
VICKERS PRESSURE COMPENSATED FLOW CONTROL VALVE, FG-3-63-K-10, NNB
MAC 20-120PSI SOLENOID VALVE W/ MANIFOLD & REGULATOR 92B-BAB-CJ4-DM-?DDAP-1DN
MILWAUKEE VALVE COMPANY BALL VALVE 2000 W0G
NUMATICS 150PSIG-AIR, 24VDC, 4.0W SOLENOID VALVE I34BA400MP00061 *NEW, SEALED*
SMC 0.15-1.0MPA 21-26VDC SOLENOID VALVE VFS2300-5FZ 104225
NIBCO 1" TRIM VALVE KT-65
ROVALVE 150PSI 16" KNIFE GATE VALVE S17-D MSS/HYC
PARKER 24VDC 6.0W 150 PSI PNEUMATIC SOLENOID SPRINT VALVE, AL43VXXBK04900B *NEW*
NUMATICS 120V, .11A, 50/60Hz, SOLENOID VALVE 152SA425K000030 *NEW,SEALED*
SPORLAN THERMOSTATIC EXPANSION VALVE EA03PC 462 NIB
PARKER 24VDC 6.0W 150 PSI PNEUMATIC SOLENOID SPRINT VALVE, AL43VXXBK04900B *NEW*
NUMATICS 120V, .11A, 50/60Hz, SOLENOID VALVE 152SA425K000030 *NEW,SEALED*
SPORLAN THERMOSTATIC EXPANSION VALVE EA03PC 462 NIB
NULLMATIC PRESSURE REGULATOR 4952-73/7LK / 42-30
LEGEND 2"NPT 150WSP 600WOG 2 WAY SHUT-OFF BALL VALVE T-1001
SMC PNEUMATIC SOLENOID VALVE VQ1101-5
PLC在RUN工作模式時(shí),執(zhí)行一次圖1-5所示的掃描操作所需的時(shí)間稱為掃描周期,其典型值約為1~l00ms。掃描周期與用戶程序的長(zhǎng)短、指令的種類和CPU執(zhí)行指令的速度有很大的關(guān)系。當(dāng)用戶程序較長(zhǎng)時(shí),指令執(zhí)行時(shí)間在掃描周期中占相當(dāng)大的比例。有的編程軟件或編程器可以提供掃描周期韻當(dāng)前值,有的還可以提供掃描周期的zui大值和zui小值。 |