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) 臨時(shí)變量
臨時(shí)變量?jī)H在邏輯塊運(yùn)行時(shí)有效，邏輯塊結(jié)束時(shí)存儲(chǔ)臨時(shí)變量的內(nèi)存被操作系統(tǒng)另行 分配。S7將臨時(shí)變量定義在L堆棧中，L堆棧是為存儲(chǔ)邏輯塊的臨時(shí)變量而專設(shè)的。當(dāng)塊程序運(yùn)行時(shí)，在L堆棧中建立該塊的臨時(shí)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(chǔ)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(shí)器、計(jì)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(shí)器(Timer) 2 B 在功能塊中定義一個(gè)定時(shí)器形參，調(diào)用時(shí)賦予定時(shí)器實(shí)參
計(jì)數(shù)器(Counter) 2 B 在功能塊中定義一個(gè)計(jì)數(shù)器形參，調(diào)用時(shí)賦予計(jì)數(shù)器實(shí)參
塊：
Block_FB
Block_FC
Block_DB
Block_SDB 2 B 在功能塊中定義一個(gè)功能塊或數(shù)據(jù)塊形參變量，調(diào)用時(shí)給功能塊類或數(shù)據(jù)塊類形參賦予實(shí)際的功能塊或數(shù)據(jù)塊編號(hào)，如
FC 101、DB 42
指針(Pointer) 6 B 在功能塊中定義一個(gè)形參，該形參說明的是內(nèi)存的地址指針。例如，調(diào)用時(shí)可給形參賦予實(shí)參P#M50.0，以訪問內(nèi)存M50.0
ANY 10 B 當(dāng)實(shí)參的數(shù)據(jù)類型未知時(shí)，可以使用該類型
1) 定時(shí)器或計(jì)數(shù)器參數(shù)類型
在功能塊中定義一個(gè)定時(shí)器或計(jì)數(shù)器類型的形參，功能塊就能使用一個(gè)定時(shí)器或計(jì)數(shù)器，而不需明確具體的定時(shí)器或計(jì)數(shù)器，等到調(diào)用該功能塊時(shí)再確定定時(shí)器或計(jì)數(shù)器號(hào)。這使用戶程序能靈活性地分配和使用定時(shí)器或計(jì)數(shù)器。當(dāng)給定時(shí)器或計(jì)數(shù)器參數(shù)類型形參分配實(shí)參時(shí)，在“T”或“C”后跟一個(gè)有效整數(shù)，如T 100。
2) 塊參數(shù)類型
當(dāng)定義一個(gè)作為輸入輸出的塊時(shí)，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(shí)參時(shí)，可以使用物理地址，如FC 101，也可使用符號(hào)地址，如“valve
3) 指針參數(shù)類型
NIB Ametek US Gauge DTT-8304 Digital Thermometer DT8300
NIB USG AMETEK SOLID FRONT 160PSI 4.5" GAUGE #150026
Ametek L-30 Depth Meter
Ametek 119419-00 Blower / Vacuum Motor
Lamb Motor Single Stage 5.7 Thru Flow Ball Bearing 120V
Ametek 1707 Tak-Ette Portable Mechanical Tachometer USA
Ametek Vacuum Motor #118154-54
NOS! AMETEK / ROTRON MUFFLER / SILENCER 523625 14.5"
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AMETEK INC. PANALARM ACS-8 8 PIN RELAY
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Ametek tachometer
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AMETEK DIXSON 101P PROGRAMMABLE BAR GRAPH 0-200 PSIG
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AMETEK DIXSON 101P PROGRAMMABLE BAR GRAPH 0-150 PSIG
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OH Ametek Aircraft Load Meter Indicator P/N 8AW61LLA1
0-600 Dial Pressure Gage Ametek Liquid Filled (New in Box) Model P1559LG
1492-MR6X12V21-30
72V AMETEK LOW WIND GENERATOR MOTOR
Ametek USG Pressure Gauge 132784 P1929
Ametek Accuforce AF5-R-ND Gage with Load Cell, Scale, Lab, Tool, Test Equipment
Ametek Hunter Spring 50 lbs. Mechanical Force Gauge
Ametek Dixson BB101P Programmable Bargraph 0 Horiz
Ametek Brushless 24 VDC Vacuum motor and Driver
Ametek Accu Force Torque Chek Digital Torge Gauge 0-200 Oz In
2 NEW AMETEK 1025-D1SP 1025D1SP FOOT AND PALM SWITCH
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Ametek Gemco Patriot 950A1-6-F-X-X-?X-10-X Quik Stik LDT
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Ametek Prestolite 350 Amp Relay NSN 5945-01-165-10?65
AMETEK CONTROLLER 24VDC, 5A, #48132-01, 6NV85, 11-52VDC
AMETEK RO-3300 REVERSE OSMOSIS SYSTEM
Dixson Instruments Bargraph BB101 AJTX4 / 20MADCV8850 Ametek NEW
AMETEK Brushless Blower 24VDC, 2.5A, 36CFM, Vacuum 13.0
Pittman/Ametek Motor, 19.7:1 Ration GM9413C555
AMETEK 1025A1DPX DOUBLE POLE FOOT SWITCH
NOS! AMETEK SPRING RESILIENCY TESTER A799571 6635-00-470-15?47
NEW AMETEK WATER FILTRATION RB25-20 SEDIMENT CARTRIDGE 25 MICRON NOMINAL
Lamb Ametek 117572-12 Vacuum Blower
~ Lamb Ametek 116757-13 2-stage 5.7" Vacuum Motor M-W
AMETEK 4M949 VACUUM MOTOR NEW 120V 4M949
Ametek Lamb Vacuum Cleaner Motor, 116392-00
AMETEK 115923 4M903 THRU-FLOW VACUUM BLOWER/MOTOR 2-STAGE 5.7" 120V
Ametek Lamb 115v 50/60hz Vacuum Motor 115962
Ametek Lamb 120v 50/60hz Vacuum Motor 116297-00
AMETEK LAMB VACUUM MOTOR 116757-13 NEW 120 VOLTS
Lamb-Ametek #119433-13 24V 5.7 3 Stage Vacuum Motor
Ametek Prestolite Contactor; 24V; #JFA-4002A; #4050-421
AMETEK CONTROLS 93PSG0002DD7AC / 93P DIGITAL PRESSURE
Drexelbrook Ametek Enclosure with 700-0001-016 Series Sensing Element *NEW*
AMETEK 89PGTB300G2CB PRESSURE TRANSDUCER 300 PSI NEW
AMETEK PHOTO DIODE ASSEMBLY PART NUMBER 471130901
Ametek RELAY 1500GL1S8OCX NIB
Ametek Drexelbrook Dumpstar Level Control Model 406-6000 700-0202-036
Ametek Lamb Electric Vacum motor
AMETEK LN-150 INSPECTION FORCE GAGE
Pittman/Ametek Motor, 38.3:1 Ratio GM9413D109
AMETEK PANALARM SC100-120A NEW 8 PIN / 11 PIN RELAY SC100120A
AMETEK Rotron Motor M22F055-3008-0?28-3HIS-3471SF?-CCW 27.6 VDC
1492-MR6X12V21-30
APC SUA24XLBP SMART-UPS 24V EXTERNAL BATTERY PACK SUA750XL SUA1000XL NEW BATTERY
WARRANTY, PRO PACKAGING, NEW BATTERIES
SUSPENSION STEERING PARTS RACK ENDS BALL JOINT F250 F350 SUPERT DUTY
APC Automatic Transfer Switch AP7750 120V NEMA5-15 12A
ADJUSTING SLEEVES TRACK BAR ARM ENDS TIE RODS RAM 2500
19" APC NetShelter 42 U Server enclosure rack cabinet
APC SC1000I Smart-UPS SC 1000VA UPS Lead Acid UPS External
BTI SLA55BTI APC Replacement Battery SLA55-BTI
2004 F-350 SUPER DUTY 2 RACK ENDS ADJUSTING SLEEVE STEERING SYSTEM KIT
HP 11691D Coaxial Directional Coupler 2-18 GHz APC7
APC BP420S NSFP BP420S
APC NetBotz NBDA30L2 6-30L AMP Detector ~STSI
APC 12-OUTLET H-TYPE RACK-MOUNTABLE POWER CONDITIONER WITH COAXIAL PROTECTION
RBC23 Replacement Battery #23 American Power Conversion-APC
APC AR8441A 6 Vertical Cable Organizer
HP 24A HIGH VOLTAGE PDU POWER DISTRIBUTION UNIT 228481-002 SERIES EO4501
APC UPS Network Management Card 2 WITH ENVIRONMENTAL MONITORING (AP9631)
APC AP9631 UPS Network Mgmnt Card
General Photonetics PolaRite, PLC-004 FC/APC
APC SC420 USPP SC420
APC BACK-UPS-450 USPP BACKUPS450
85031-60002 Agilent APC7 50 Ohm Termination 6 GHz
SCA SCHUCKER APC3000-05 USPP APC300005
AP9631 UPS Network Mgmnt Card American Power Conversion-APC
APC AP7584 200/208V 230V PDU Extender Power Strip 2U
Agilent / HP 11604A Universal APC7 Extension with Case + Swivel Adapters
APC Back-UPS RS BR1300G 1300 VA Tower UPS 1300VA 0.25 Hr Half Load 8Hr Recharge
APC 0U AP7862 3 Phase Metered PDU IP Powerstrip 5.7kW 208V - 120V Output
ERTL "The Car" 1:18 & Pittman VaporWax APC 360ID Acrylic Paint Conditioner
AP7532 Rack PDU Zero U 20A/120V American Power Conversion-APC
APC Back-UPS ES 750 750VA Backup w/RBC4 12V 12ah Battery & USB Cable BE750BB
APC Back-Ups Pro PB420S
ABB ROBOTICS POWER CONNECTION BOARD SAFT 190 APC
DRAG
REPAIR KIT SUSPENSION UPPER LOWER CONTROL ARM BALL JOINTS GRAND CHEROKEE 5.2L
Akai Professional APC20 Compact Ableton Controller NEW
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APC BR700G Back-UPS RS Line Interactive Master Control UPS - 700 VA/450 Watts -
BIOTEST P3601 APC AIRBORNE PARTICLE COUNTER REPAIR
APC SU420NET USPP SU420NET
APC SU420INET USPP SU420INET
APC Smart-UPS SC 450VA Rack Mount-Tower 5.9 Min Full Load 4xNEMA 5-15R SC450RM1U
1492-MR6X12V21-30
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