1817-414-332現(xiàn)貨

實惠為了合作，合作為了更多的合作！ 合作為了共贏，共贏為了美好的明天！ 貨源豐富，實力雄厚， 現(xiàn)貨居多，滿足需求， 質(zhì)量保證，讓您買的放心，用的安心， 福州聚福興自動化有限公司 歡迎來電咨詢?。。。?br />

一個指針給出的是變量的地址，而不是變量的數(shù)值大小。在有些功能塊中，可能使用指針編程更為方便。用定義指針類型的形參，就能在功能塊中先使用一個虛設(shè)的指針，待調(diào)用功能塊時再為其賦予確定的地址。當(dāng)為指針參數(shù)類型形參分配實參時，需要指明內(nèi)存地址，例如P#M50.0。
3. 塊調(diào)用過程及內(nèi)存分配
CPU提供塊堆棧(B堆棧)來存儲與處理被中斷塊的有關(guān)信息。當(dāng)發(fā)生塊調(diào)用或有來自更高優(yōu)先級的中斷時，就有相關(guān)的塊信息存儲在B堆棧里，并影響部分內(nèi)存和寄存器。圖5.2顯示了調(diào)用塊時B堆棧與L堆棧的變化。圖5.3提供了關(guān)于STEP 7的塊調(diào)用情況。
1) B堆棧與L堆棧
B堆棧是CPU系統(tǒng)內(nèi)存中的一部分，它存儲以下被中斷塊的數(shù)據(jù)：
(1) 塊號、塊類型、優(yōu)先級、被中斷塊的返回地址；
(2) 塊寄存器DB、DI被中斷前的內(nèi)容；
(3) 臨時變量的指針(被中斷塊的L堆棧地址)。
STEP 7中可使用的B堆棧大小是有限制的，對于S7-300 CPU，則可在B堆棧中存儲8個塊的信息。因此，塊調(diào)用嵌套深度也是有限制的，多可同時激活8個塊。
L堆棧是CPU內(nèi)存中的一部分，它在塊調(diào)用時被重新分配。L堆棧用來存儲邏輯塊中定義的臨時變量，也分配給臨時本地數(shù)據(jù)使用。梯形圖的方塊指令與標(biāo)準(zhǔn)功能塊也可能使用L堆棧存儲運算的中間結(jié)果。
2) 調(diào)用功能塊FB
當(dāng)調(diào)用功能塊FB時，會有以下事件發(fā)生：
(1) 調(diào)用塊的地址和返回位置存儲在塊堆棧中，調(diào)用塊的臨時變量壓入L堆棧；
(2) 數(shù)據(jù)塊DB寄存器內(nèi)容與DI寄存器內(nèi)容交換；
(3) 新的數(shù)據(jù)塊地址裝入DI寄存器；
(4) 被調(diào)用塊的實參裝入DB和L堆棧上部；
(5) 當(dāng)功能塊FB結(jié)束時，先前塊的現(xiàn)場信息從塊堆棧中彈出，臨時變量彈出L堆棧；
(6) DB和DI寄存器內(nèi)容交換。
當(dāng)調(diào)用功能塊FB時，STEP 7并不一定要求給FB形參賦予實參，除非參數(shù)是復(fù)式數(shù)據(jù)類型的IO形參或參數(shù)類型形參。如果沒有給FB形參賦予實參，則功能塊FB就調(diào)用背景數(shù)據(jù)塊內(nèi)的數(shù)值。該數(shù)值是在功能塊的變量聲明表內(nèi)或背景數(shù)據(jù)塊內(nèi)設(shè)置的形參初始數(shù)值。
3) 調(diào)用功能塊FC
當(dāng)調(diào)用功能塊FC時會有以下事件發(fā)生：

APC Low Voltage RM Metered PDU 120v AP7862 New
APC SmartUPS Replacement Battery Cartridge RBC59 NEW
DS1463 Steering Drag Link lower upper ball joint Dodge RAM 2003 2008
APC H15BLK 12-OUTLET H-TYPE RACK-MOUNTABLE POWER CONDITIONER
BTI- Battery SLA24-BTI Lead Acid Battery APC DLA1500RM2U SU1400RM2U SUA1500RM2U
AP7830 APC 24-Outlet Power Distrubution Unit Strip
APC AR8215 15" LCD Monitor Rackmount Keyboard/Track?ball
AP7830 Rack PDU Metered Zero U American Power Conversion-APC
APC Symmetra RM 8-12KVA Extended Battery Module SYBT3
APC Color Display for Symmetra MP - AP9235 - 24 VDC - 1.2 Amp
APC AP7920 Rack PDU Switched 1U 12A/208V
APC AP7900 Rack PDU Switched 1U 15A/120V
X281C Waveguide Adapter, APC-7, 8.2 to 12.4 GHz
APC Replacement Battery Cartridge #12 (RBC12)
APC RBC55 Replacement Battery #55
AP7581 Rack PDU Extender, 2U 30A 200V American Power Conversion-APC
AP7580 Rack PDU Extender, 2U 30A 120V American Power Conversion-APC
APC Controller Board 640-0800G
APC Controller Board 640-0800F
SUA750US 750VA Smart Ups USB/Serial American Power Conversion-APC
APC AP7750 power distribution unit
AP7582 Rack PDU Extender, 2U 30A 120V American Power Conversion-APC
APC PS450 POWER STACK *USED*
APC SLIDING SHELF 100LB CAPACITY BLACK P/N AR8123BLK NEW
APC NET9RM SURGE ARREST 9-0UTLET POWER DISTRIBUTION **LOT OF 3 NEW IN BOX UNITS*
APC RBC25 Replacement Battery #25
SMC1000 Smart UPS C 1000VA American Power Conversion-APC
APC AP7584 Rack PDU Extender 2U 200/208V
APC Smart UPS SC 6-Outlet 1500VA 865 Watt UPS Battery Power Supply Network
APC AP-9619 USPP AP9619
APC SC1000 1000VA 600W UPS
HP Agilent 11590A Bias Network Tee 1-12.4 GHz APC-7
APC High Voltage RM PDU 30Amp 208v AP7598
WILTRON 58A50 SWR Bridge, 2-18 GHz, APC7 test port, 35 dB directivity
2000 4X4 DODGE RAM 1500 PICKUP RACK ENDS TRACK BAR END
APC EPW9 USPP EPW9
NEW APC SMART-UPS SC 450VA SC450RM1U 1U RACKMOUNT/TOWE?R
ABB DRIVES PCB ASSY, AUX POWER CARD, SAFT 166 APC, 58096652 AB 891011 (BIN 61)
APC CAT-6 Data Distribution Cable - 50 feet DDCC6-050
APC NetBotz Camera Pod 120, NBPD0121 ~STSI
Agilent 85130A Adapter Set Test Port APC-7 to APC3.5mm Female
APC SMT750 SMART-UPS SYSTEM (750VA USB & SERIAL 120V)
APC Replacement Battery Cartridge #24 -RBC24

1817-414-332

AMETEK FIG # P1408 SPEC # 044585 PRESSURE GAUGE GUAGE GAGE SIZE 3" FACE 0-1000PS
Ametek Lamb Vacuum Cleaner Motor 116309-00
Ametek Universal Thru-Flow Vacuum Motor 120V 1Ph New
ENFM 160 PSI Liquid Filled Pressure Gauge, Ametek/TCI Division
Ametek Pressure Gauge 1/2"NPT SS V1929 / 1929
Ametek / USG Pressure Gauge Arc-Loc 0-160 psi 4-1/2"
Ametek 1726 Dual Function Digital Tachometer
Ametek / USG Pressure Gauge Arc-Loc 0-300 psi, 4-1/2"
Lamb Ametek Vacuum Cleaner Motor 119400-00
Ametek / USG Pressure Gauge 0-60 psi 4-1/2"
AMETEK MODEL 1535 STAINLESS PRESSURE GAUGE NIB
NEW AMETEK 300 PSI SOLFRUNT PRESSURE GAUGE 1982 300
Ametek Pressure Gauge Gage 2-1/2" 2000-PSI 1/4NPT NEW
New Lamb Ametek 116378 Vacuum Motor ; 2-stage, 4.3 inch, 120 volt MADE IN USA
AMETEK USG 0-60 PSI P1929 4 1/2" GAUGE 1/2 NPT NIB
Ametek P1408 100PSI
Ametek Brushless Motor Controller With Heatsink 48070-01
*Ametek 1903 200psi
Ametek 116565-00 Blower / Vacuum Motor
118173-73 220volt Power Nozzle Motor, Ametek Lamb
4 NEW NIB AMETEK/USGAUGE PRESSURE GAUGE 088703 30-0-150 1/8" ANPT 2-1/2" FACE
AMETEK TRANSMITTER PRESSUR SYNCHRO 26VOLTS 0-100PSI MS28131 ST-106AG
AMETEK LAMB 117135-00 VACUUM MOTOR / BLOWER MOTOR NEW
Ametek DCTG0100DPT012 New Surplus in the box
AMETEK ROTRON FAN 28VDC 2.10AMPS 5000RPM 85MAX AMB
Ametek USG Pressure Gauge P1555LX
Ametek USG 160 PSI 4''
Ametek USG 2-1/2" Dia Pressure Gauge P1555LX (Lot of 2)
Ametek Pressure Gauge P500K (2)
Ametek ANSI-B40 Pressure Gauge ! NEW !
AMETEK TRANSDUCER SPT0200X140 ~ New
NEW Graco vacuum motor VM-6C single stage Ametek 8.625-855.0
6600-199 *NEW* OE Solenoid for Prestolite, Ametek 12V
AMETEK / M & G DIVISION 316L NEW TYPE AB STAINLESS STEEL DIAPHRAGM 316L
Stroboscope, strobette, Model 964A, Ametek 200-6000 flash/minute
5 Used Ametek 300 psi gauges 4-1/2" 1/4 ANPT
AMETEK 120 Volt Air blower motor for spa / hot tub **
AMETEK Air Volume Control !!!ALL OFFERS WILL BE CONSIDERED!!! FS
Analog Ametek 300 psi Pressure Gauge
AMETEK/HUNTER SPRING ML2918 CABLE NEW
Ametek/Rochest?er Loop Isolator Mod #SC2302-1 42 VDC Max 1072-307 (NIB)
AMETEK DIAPHRAM SG 316L
Ametek/US Gauge Solfrunt Pressure Gauge Fig #1981 0-160# 4-1/2" 1/2" ANPT (NIB)

1817-414-332

NEW AMETEK DREXELBROOK 509-7X Universal III Level
Make offer for 2 - I have 2 of these if you need more
Ametek AccuForce Torque-Chek 0-100 lb.in
Ametek Block Calibrator DB-700A DB700A A
Ametek Drexelbrook 505-5100 Seri Ultrasonic Transmitter
AMETEK PSI x100 # AW1017AC02 1000lbs PRESSURE INDICATOR
AMETEK / CHATILLON CADET CD1 SERIES CD1-050 DIGITAL FORCE, PUSH / PULL GAUGE (#1
AMETEK / CHATILLON CADET CD1 SERIES CD1-050 DIGITAL FORCE, PUSH / PULL GAUGE (#2
AMETEK GEMCO 1986B1XRX RESOLVER
AMETEK / HDR POWER SYSTEMS HDR ZF2-480-180-NC POWER SUPPLY
DREXELBROOK / AMETEK 406-4012-001 LEVEL CONTROL - USED/WORKS/GUA?RANTEED w/WARRAN
AMETEK TM-II THERMOX
AMETEK TRANSDUCER 1986F2XSX REPLACES HT20/S
Ametek Pittman N2344A070-R7 Servo Motor ELCOM ST NEW
Ametek 19804125T Rotating Cam Limit Switch ! WOW !
Ametek 5800 Moisture analyzer! #695
AMETEK MODCAL Multifunction Calibrator
Ametek BBVRXXXXY1VDLX?BX03-68 Bargraph Module 24VDC ! NEW !
Ametek mAcal Calibrator
Ametek Interface PCB Board 80536SE Rev. K Working A0109 019
Ametek G637 Motor 117793-51 For Gast Pump New Lot of 4
AMETEK Modcal Multifunction Modular Calibrator
AMETEK 1726 TACHOMETER,DIG?. TACHOMETER S/N011393009
Ametek Accu Force II Force Gage 3 0-100 Model ML 4433-1
AMETEK EDAX ADVANCE MICROANALYSIS SOLUTIONS
NEW AMETEK GEMCO LINEAR TRANSDUCER 951A-C1-0030-X?-X-E
AMETEK KVB OXYGEN ANALYZER FCA-LX-CONTROL
AMETEK DYCOR QUADRUPOLE RGA RESIDUAL GAS ANALYZER PROBE M106 SPECTROMETER QMS
AMETEK GEMCO 2000-2954 ROTARY CAM LIMIT SWITCH 1-1 NEW
Ametek RQ-55 Dead Weight Pressure Tester w/Weights
Ametek controls division Modcal multifunction calibrator #1
Ametek controls division Modcal multifunction calibrator #2
Ametek LC100 Dycor LC200S RGA Gas Analyzer Mass Spectrometer
Ametek LC100 RGA Residual Gas Analyzer Mass Spectrometer RF Box Probe Head Cable
AMETEK 1726 Digital Tachometer
AMETEK MODEL 40 PRESSURE OUTPUT CONTROLLER - NEW
AMETEK 40 PRESSURE OUTPUT CONTROL GAUGE GAGE 11KB-BL
Ametek 400 Series Retrofit Kit P/N A.471181901 400 Solid State Photometer (NEW)
AMETEK Windjammer Model 116638-08, 3 Stage BLDC By Pass Blower, 120 VAC

1817-414-332