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) 臨時變量
臨時變量僅在邏輯塊運(yùn)行時有效，邏輯塊結(jié)束時存儲臨時變量的內(nèi)存被操作系統(tǒng)另行 分配。S7將臨時變量定義在L堆棧中，L堆棧是為存儲邏輯塊的臨時變量而專設(shè)的。當(dāng)塊程序運(yùn)行時，在L堆棧中建立該塊的臨時變量，一旦塊執(zhí)行結(jié)束，堆棧重新分配，因而信息丟失。
邏輯塊局部數(shù)據(jù)的數(shù)據(jù)類型
在變量聲明表中，要明確局部數(shù)據(jù)的數(shù)據(jù)類型，這樣操作系統(tǒng)才能給變量分配確定的 存儲空間。局部數(shù)據(jù)可以是基本數(shù)據(jù)類型或復(fù)式數(shù)據(jù)類型，也可以是專門用于參數(shù)傳遞 的所謂的“參數(shù)類型”。參數(shù)類型包括定時器、計數(shù)器、塊的地址或指針等，見表5.2。表5.2 參數(shù)類型變量
參數(shù)類型 大 小 說 明
定時器(Timer) 2 B 在功能塊中定義一個定時器形參，調(diào)用時賦予定時器實參
計數(shù)器(Counter) 2 B 在功能塊中定義一個計數(shù)器形參，調(diào)用時賦予計數(shù)器實參
塊：
Block_FB
Block_FC
Block_DB
Block_SDB 2 B 在功能塊中定義一個功能塊或數(shù)據(jù)塊形參變量，調(diào)用時給功能塊類或數(shù)據(jù)塊類形參賦予實際的功能塊或數(shù)據(jù)塊編號，如
FC 101、DB 42
指針(Pointer) 6 B 在功能塊中定義一個形參，該形參說明的是內(nèi)存的地址指針。例如，調(diào)用時可給形參賦予實參P#M50.0，以訪問內(nèi)存M50.0
ANY 10 B 當(dāng)實參的數(shù)據(jù)類型未知時，可以使用該類型
1) 定時器或計數(shù)器參數(shù)類型
在功能塊中定義一個定時器或計數(shù)器類型的形參，功能塊就能使用一個定時器或計數(shù)器，而不需明確具體的定時器或計數(shù)器，等到調(diào)用該功能塊時再確定定時器或計數(shù)器號。這使用戶程序能靈活性地分配和使用定時器或計數(shù)器。當(dāng)給定時器或計數(shù)器參數(shù)類型形參分配實參時，在“T”或“C”后跟一個有效整數(shù)，如T 100。
2) 塊參數(shù)類型
當(dāng)定義一個作為輸入輸出的塊時，參數(shù)聲明決定了塊的類型(FB、FC、DB等)。當(dāng)為塊參數(shù)類型形參分配實參時，可以使用物理地址，如FC 101，也可使用符號地址，如“valve
3) 指針參數(shù)類型
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"
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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
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4 NEW NIB AMETEK/USGAUGE PRESSURE GAUGE 088703 30-0-150 1/8" ANPT 2-1/2" FACE
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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)
XYCOM 4160-B
AMETEK AIR VOLUME CONTROL
Ametek Mechanical Force Gauge LKG-2 with case
AMETEK PRESSURE GAUGES VACUUM V500 1/4"LM
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AMETEK DREXELBROOK 506-6000 LCS POINT LEVEL CNTL MANUAL
Ametek T-645 Reservoir for T-620 Hydraulic Hand Pump
Ametek 2-Volt 9-18 Volt Gauge 0A0D40 Auto/Marine NGI 2 Blk
Lot of 3, Panalarm Ametek Relay 70-TCF1-12 UNUSED
AMETEK / M & G DIVISION 316 USED TYPE SB STAINLESS STEEL DIAPHRAGM 316
AMETEK HUNTER L-20M MECHANICAL GAGE
* AMETEK VACUUM MOTOR/BLOWER, 2M425
Ametek Tachometer/Pro?cess Time Indicator (LOC-L3)
AMETEK DIXSON TACHOMETER 0-3500 RPM W/HOUR METER24V NEW
Ametek Suspended Electrode Lot of 2
RILEY AMETEK PANALARM 50-F1 RELAY 24VDC 24V 24 VOLT VDC
AMETEK USG 171732AGL GAUGE 1/4 NPT NEW 5000PSI
Ametek RO-3167 Reverse Osmosis System Membrane 24Gpd Water Filter
US GAUGE AMETEK 3" PRESSURE TEST GAUGE 0 - 20 PSI
Ametek 115757- P Vacuum Motor
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AMETEK WINDJAMMER BLOWER MOTOR 1-3/4" FILTER 551692
NEW AMETEK SOLFRUNT 1980 PROCESS GAUGE, 30-0-60 PSI
Ametek Lamb 116311-00 Vacuum Cleaner Motor Brushes
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AMKASYN KU-40-1 USPP KU401
AMKASYN 45739946-71876?4 USPP 45739946718764
AMK AMKaSYN AN40 Power Supply Module #6881LR
AMK AMKASYN AZ40 Drive Nr.44457-9922-?586865
AMK/AMKASYN 45620-9811-553?760 INVERTER DRIVE ***XLNT***
AMK/AMKASYN 45621-0042-745?173 INVERTER DRIVE ***XLNT***
APC PDUM160H-B Symmetra PX Battery Enclosure tested spare
APC SYCF40KF USPP SYCF40KF
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Lucent ADAX APC7 SS7 Controller 2x 500Mhz Xeon Server
Snap Tool Box
APC ET41150 USPP ET41150
1/6 Scale Custom Handmade All Metal M113 APC Armored Personel Vehicle Hot Toys
Enlarge
APC power distribution cabinet - 80 kW Mfg. Part: 0G-PD80G6FK1-M?1
APC SYAF8KRMT Symmetra LX 8kVA N+1 Power Array Cabinet AC 208/240 V
APC SYSW40KF USPP SYSW40KF
New AMD Universal Interrupt Controller PN# AM9519APC
XYCOM 4160-B
APC Smart-UPS RM 3000VA USB UPS
APC SMX1000 UPS Rack/Tower 120V/800Watt/(?8)NEMA 5-15R
APC CTSPTM90156120 NSFP CTSPTM90156120
APC Redundant Switch SUO44-1 EPO SORCE
APC SMT1000 SMART-UPS 1000VA 670w LCD 120V w/ USB,DB-9
HP 346A 10MHz-18GHz, ENR: 5-7dB, APC-7 Noise Source
APC MX06-AFC DC ADVANCE POWER PLANT RECTIFIER MX06 AFC
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AP7990 Rack PDU 5.7kW 120V American Power Conversion-APC
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OPTISPEC ME2502APC OPTICAL FIBER MICROSCOPE NEWPORT
SMX1500RM2U Smart-UPS X 1500VA Rack/Tower American Power Conversion-APC
APC Switched Rack AP8941 24-Outlets PDU AP8941
APC 640-0734G USPP 6400734G
APC AP7990 Rack PDU 5.7kW 120V
APC SU1400 USPP SU1400
APC SUA1500 USPP SUA1500
Cisco WS-X6066-SLB-A?PC 6066 APC
1 YR WARRANTY INCLUDED ***FREE SHIPPING***
APC Smart-UPS X 1500VA 1200W Tower Rack Mountable UPS
APC 1U Rack Mountable 16A Automatic Transfer Switch AP7701
APC Switched Rack 5.7kVA PDU (AP7960)
APC SU48XLBP NSPP SU48XLBP
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APC SUA2200 SMART UPS BATTERY BACKUP 120V 1920W USB SERIAL EPO 1920VA 51301
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APC SURTA3000XL SMARTUPS RT 3000VA XL OL 120V
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APC SMX1500RM2U Smart-UPS X 1500VA Rack/Tower
APC SC1000 - APC Smart-UPS SC 1000VA 120V - 2U Tower NE
AP7724 APC Automatic Transfer Switch redundant switch
APC AP7960 Rack PDU Switched Zero U
APC SUA1000RM2U USPP SUA1000RM2U
APC Smart-UPS SC 1500VA Rack-mountable Tower UPS 1500VA/865W 7.6Minute Full Load
SMT1500RM2U Smart-UPS 1500VA LCD RM2U 120V American Power Conversion-APC
APC Smart-UPS 1500VA 230V 980 Watts LCD Tower SMT1500I
ALIGN T-REX 550E 3GX Combo + APLUS THUNDER Battery Helicopters KX021008APC
APC Smart-UPS X 1000 VA Tower/Rack Mountable UPS SMX1000
85051-60001 Agilent APC7 20db pad
APC AP7701 Rack ATS 5.7kW 100/120V
XYCOM 4160-B
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