1326AB-B420E-21-X51現(xiàn)貨

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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的指針，待調用功能塊時再為其賦予確定的地址。當為指針參數(shù)類型形參分配實參時，需要指明內存地址，例如P#M50.0。
3. 塊調用過程及內存分配
CPU提供塊堆棧(B堆棧)來存儲與處理被中斷塊的有關信息。當發(fā)生塊調用或有來自更高優(yōu)先級的中斷時，就有相關的塊信息存儲在B堆棧里，并影響部分內存和寄存器。圖5.2顯示了調用塊時B堆棧與L堆棧的變化。圖5.3提供了關于STEP 7的塊調用情況。
1) B堆棧與L堆棧
B堆棧是CPU系統(tǒng)內存中的一部分，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內存中的一部分，它在塊調用時被重新分配。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準功能塊也可能使用L堆棧存儲運算的中間結果。
2) 調用功能塊FB
當調用功能塊FB時，會有以下事件發(fā)生：
(1) 調用塊的地址和返回位置存儲在塊堆棧中，調用塊的臨時變量壓入L堆棧；
(2) 數(shù)據(jù)塊DB寄存器內容與DI寄存器內容交換；
(3) 新的數(shù)據(jù)塊地址裝入DI寄存器；
(4) 被調用塊的實參裝入DB和L堆棧上部；
(5) 當功能塊FB結束時，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寄存器內容交換。
當調用功能塊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就調用背景數(shù)據(jù)塊內的數(shù)值。該數(shù)值是在功能塊的變量聲明表內或背景數(shù)據(jù)塊內設置的形參初始數(shù)值。
3) 調用功能塊FC
當調用功能塊FC時會有以下事件發(fā)生：

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IDEC APW1126D-G NSFP APW1126DG
IDEC APW226D-G NSFP APW226DG
IDEC APW226D-W NSFP APW226DW
APW International NI8028A Axle Shaft New Right
APW International NI8241 Axle Shaft New Right
APW International NI8030A Axle Shaft New Right
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APW International NI8044 Axle Shaft New Right
APW International NI8028 Axle Shaft New Right
IDEC APW2246G-240V USPP APW2246G240V
IDEC APW2246R-240V USPP APW2246R240V
IDEC APW2126-R-6V USPP APW2126R6V
Xtera Meriton 900-0135-01 3300 PS-200-1 115/230 VAC REDUNDANT POWER SUP APW
Sarawak 1934 SG 106-25 MOG (4apw)
IDEC APW226D-G NSPP APW226DG
USED APW / WYOTT CW-3A COMMERCIAL LARGE SINGLE COMPARTMENT FOOD WARMER
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IDEC APW1126-W NSPP APW1126W
APW International NI8134A Axle Shaft New Right
APW International NI8030 Axle Shaft New Right
APW International VO8004A Axle Shaft New Right
APW International TO8320A Axle Shaft New Right
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APW International NI8260A Axle Shaft New Right
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APW International TO8203 Axle Shaft New Left
APW International FD8058 Axle Shaft New Left
APW International NI8039 Axle Shaft New Right
APW ELECTRONIC SOLUTIONS 88-34 USPP 8834
IDEC APW199-G-12V NSPP APW199G12V
IDEC APW1126A NSFP APW1126A
NXP SEMICONDUCTOR 74LVC4245APW FNFP 74LVC4245APW
TEXAS INSTRUMENTS SEMI SN74ABT244APW FNFP SN74ABT244APW
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IDEC APW2LU-A NSPP APW2LU-A
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1326AB-B420E-21-X51

GENUINE APC Symmetra Replacement Battery SYBTU1-PLP C10 NEW for SYBT4
Intel FPPUPS120 APC AX150UPS-120P Rack-Mount UPS
APC Smart-UPS SMT1000RM2U 1000VA Rack-mountable UPS SMT1000RM2U
APC Smart-UPS SUA1500US 1500VA 1500VA TWR 120V LIN
Agilent / HP 11857D Test Port Cables, APC-7, 50 Ohms (matching). Warranty.
NEW APC SUA1500I Smart Standalone Power Supply with Serial & Usb Port - 8 outlet
APC Cabinet W/AP9607 UPS Interface Exp. Mod#2200 Clean
APC NETSHELTER 42U AR2101BLK BLACK RACK SERVER CABINET look call for details
APC AP8941 Rack PDU 2G, Switched, ZeroU
APC Smart-UPS SMT1500RM2U 1440VA 1 kW Rack-mountable UPS 0.12 Hour Full Load USB
Used APC Smart-Ups 1500 SAU1500 980W
200 APC Signaling UPS USB to RJ45 RJ50 Enthernet Cable
200 APC Signaling UPS USB to RJ45 RJ50 Networking Cable
APC Smart-UPS 1000VA SUA1000RM1U
SMX1000 Smart-UPS X 1000VA Rack/Tower American Power Conversion-APC
GXT1500RT-120 Liebert 120V Eight Outlet UPStation!
APC Symmetra Replacement Battery Cartridge SYBT2 NEW
SYMIM5 Symmetra LX Intelligence Mod American Power Conversion-APC
APC 48V EXTENDED BATTERY PACK (UPS) RM TOWER-SMART UPS X SERIES P/N SMX48RMBP2U
APC Smart-UPS 1500VA Tower UPS SMT1500
APC SUA1500R2X138 Smart UPS 1500VA 120V
APC SUA1500US 1500VA Smart-UPS 120V NAFTA
APC 1MRF28H54BV MRF 2800 RECTIFIER
Agilent 11857D 50 ohm APC-7 Test Port Cable for 8753D/E
APC Smart-UPS 1000 VA Tower 670W 6.1 Minute Full Load SMT1000 6.1 Min Full Load
APC Smart-UPS 3000 XLM SUM3000RMXl2U Rackmount UPS System
APC Symmetra RM 8-12kVA Battery Module Hot-swappable SYBT3
APC SMT1500RM2U Smart-UPS 1500VA LCD RM2U 120V
5131:APC-Ameri?can Power Conversion:SU5?000RMT5U:Misc:?Power Supply
APC AICHI PUMP MC-32S4L NSFP MC32S4L
APC AP7932 Rack PDU Switched, Zero U 30A
ROHL PERRIN ROWE U.3531X-APC TUB FILLER TUB CHROME NEW
Agilent / HP 11857D Test Port Cables, APC-7, 50 Ohms. Warranty.
NEW AKAI APC40 ABELTON CONTROLLER AND SOFTWARE FOR PRO DJ CLUB STAGE MUSICIANS
APC SMX1000 Smart-UPS 800 Watts 1000 VA 120V 2U Rack Tower LCD System
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APC RBC12 SmartUPS Replacement Battery Cartridge (2200/3000/500?0)
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APC NO:640-0734G PC BOARD REV-8 {ITEM TAKEN OUT OF NEW PRODUCT}

1326AB-B420E-21-X51

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1326AB-B420E-21-X51