? ? 根據(jù)系統(tǒng)的控制要求,采用合適的設(shè)計(jì)方法來(lái)設(shè)計(jì)PLC程序。程序要以滿足系統(tǒng)控制要求為主線,逐一編寫實(shí)現(xiàn)各控制功能或各子任務(wù)的程序,逐步完善系統(tǒng)指定的功能。除此之外,程序通常還應(yīng)包括以下內(nèi)容: ?
? ? 1)初始化程序。在PLC上電后,一般都要做一些初始化的操作,為啟動(dòng)作必要的準(zhǔn)備,避免系統(tǒng)發(fā)生誤動(dòng)作。初始化程序的主要內(nèi)容有:對(duì)某些數(shù)據(jù)區(qū)、計(jì)數(shù)器等進(jìn)行清零,對(duì)某些數(shù)據(jù)區(qū)所需數(shù)據(jù)進(jìn)行恢復(fù),對(duì)某些繼電器進(jìn)行置位或復(fù)位,對(duì)某些初始狀態(tài)進(jìn)行顯示等等。 ?
? ? 程序模擬調(diào)試的基本思想是,以方便的形式模擬產(chǎn)生現(xiàn)場(chǎng)實(shí)際狀態(tài),為程序的運(yùn)行創(chuàng)造必要的環(huán)境條件。根據(jù)產(chǎn)生現(xiàn)場(chǎng)信號(hào)的方式不同,模擬調(diào)試有硬件模擬法和軟件模擬法兩種形式。 ?
? ? 1)硬件模擬法是使用一些硬件設(shè)備(如用另一臺(tái)PLC或一些輸入器件等)模擬產(chǎn)生現(xiàn)場(chǎng)的信號(hào),并將這些信號(hào)以硬接線的方式連到PLC系統(tǒng)的輸入端,其時(shí)效性較強(qiáng)。
? ? 2)軟件模擬法是在PLC中另外編寫一套模擬程序,模擬提供現(xiàn)場(chǎng)信號(hào),其簡(jiǎn)單易行,但時(shí)效性不易保證。模擬調(diào)試過(guò)程中,可采用分段調(diào)試的方法,并利用編程器的監(jiān)控功能?!緝r(jià)格】 ? 如此低價(jià),僅此一家
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HONEYWELL MICRO SWITCH PART # FYAA3J2-2
ALLEN BRADLEY 1771-P2 120/220 VAC 6.5 AMP POWER SUPPLY
MARS 12128 MOTOR RUN CAPACITOR 65MFD 370VAC ROUND (10)
SHINGLE BELTING D10 MONO#94884 4FTX41/8IN X33INW. 2BELT
DURASEAL DURAMETALLIC Y53V2500A33 # 5 CARBON SEAL RING
SQUARE D 2 POLE 40 AMP CIRCUIT BREAKER FA22040CA
BECKHOFF IE1001-0000 8 CHANNEL DIGITAL INPUT MODULE
VWR Signature 83009-688 Aerosol Filter Pipet Tips for R
VWR Signature 53510-037 Aerosol Filter Pipet Tips. 1-2
BECKHOFF IE3202-0000 4 CHANNEL ANALOG INPUT MODULE
MOLECULAR BIO PRODUCTS 3418 120 x 8-TUBE STRIPS & CAPS,
50 x NUNC 442404 FLAT BOTTOM, MAXISORP, PINCHBAR, 400ul
U.S. ELECTRIC MOTOR MODEL 7899-SEF 1/4HP, SINGLE PHASE?
LOAD CONTROLS INC KWH-2 DIGITAL POWER- ENERGY METER
KODAK BIOMAX MBP300 CAT#92120(115 VAC) 92122(230 VAC)?
VICI EHCA-CE 2 POSITION CONTROL MODULE 24 VDC
GENERAL ELECTRIC COIL 15D21G2 95/115 VAC 50/60 HZ
GPK 12" PVC PSM, 12" PVC CAP ATSM D-3034
ALLEN BRADLEY 100-A30NZ243 30 AMP 24 VDC 3PH CONTACTOR
RELIANCE ELECTRIC DUTY MASTER P14J3633M 1.5 HP MOTOR
BARNSTEAD/THERMOLYNE BT SURE DB104115 INCUBATOR
RETIX SEC-9217 1222022-00 REV-F POWER SUPPLY
GS O-Z/GEDNEY GUB-443A HAZARDOUS LOCATION JUNCTION BOX
BEI MOTION SYSTEMS E153-1024T OPTICAL ENCODER
AGILENT TECHNOLOGIES G1364-68712 TUBING KIT .25 MM ID 1
DIXON DL32 MALLEABLE IRON DBL LOT OF 12
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ALLENAIR ET 2 X 1 SR-F CYLINDER
BECKMAN CAT # 373093 BIOMEK 1000 STATION P-1000 TOOL
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ZURN INDUSTRIES CENTRIC MOTOR CLUTCH
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WORCESTER SER39 ACTUATOR PROXIMITY ROTARY SWITCH 1/2CPT
DWYER 602-0 DIGITAL DIFFERENTIAL PRESSURE TRANSMITTER
HUMPHREY FOOT ACTUATOR 250 4F c/w 0-100psi PRESSURE REG
UNIVERSAL ANALYZERS 3500-0002 REV. B SAMPLE COOLER PCB
SELEMA TYPE 175 MOTOR & BONFIGLIOGI MVF-49/P REDUCER
GP:50 311-B PRESSURE TRANSDUCER 0-10 PSIG
FISHERBRAND 10-572-2D COMPRESSED GAS REGULATOR 3000 PSI
Corning 3151 Straight neck; 162cm2 culture area; Vent C
PART CASE OF 800 FISHER 10-500-26 CRYOGENIC VIAL 2ml, S
WORLDWIDE AT34-18-56C 3/4 HP INDUSTRIAL DUTY MOTOR
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TELCO MODEL 375 TAPPER 0-1/2 CAP
PART CASE OF 87 CORNING 3930 CORNER NOTCH LIDS.
TRI CLOVER STYLE BALL VALVE 316L STAINLESS STEEL
HP CABLE MANAGEMENT ARM DL360 G4 MODEL # 365403-B21
DRESSER 1982C-1-CC-33-SC-SC-SS 3/4" X 1.0" 40 PSI SAFE
LAFERT ST56S2V .18 HP 3300 RPM MOTOR & VR 92 CAT BLOWER
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FLEX-HOSE CO. INC FLEXZORBER NNS 2" EXPANSION JOINT
WESTINGHOUSE 15AMP CIRCUIT BREAKER. MOD# HFB3015 RECON
LOT OF 2 COOPER BUSS LPJ-150SP LOW PEAK DUAL ELEMENT TI
LYNDEX C5016-0375 CNC CAT50 END MILL HOLDER
LOT OF 4 COOPER BUSS LPJ-70SP LOW PEAK DUAL ELEMENT TIM
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WESTINGHOUSE 15AMP CIRCUIT BREAKER HFB3015
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FALK ULTRAMITE HELICAL WORM GEARMOTOR