1734-VHSC5現(xiàn)貨

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如果確實(shí)需要，還可以在程序運(yùn)行中動(dòng)態(tài)定義一個(gè)數(shù)據(jù)塊。動(dòng)態(tài)定義時(shí)，數(shù)據(jù)塊號(hào)是自動(dòng)產(chǎn)生的，數(shù)據(jù)塊在存儲(chǔ)器中的位置是動(dòng)態(tài)分配的。由于要定義的數(shù)據(jù)塊有可能大于CPU存儲(chǔ)器(用于數(shù)據(jù)塊的部分)的剩余空間，因此動(dòng)態(tài)定義過程有可能失敗
2．訪問數(shù)據(jù)塊
在用戶程序中可能定義了許多數(shù)據(jù)塊，而每個(gè)數(shù)據(jù)塊中又有許多不同類型的數(shù)據(jù)，因此，訪問時(shí)需要明確數(shù)據(jù)塊號(hào)和數(shù)據(jù)塊中的數(shù)據(jù)類型與位置。根據(jù)明確數(shù)據(jù)塊號(hào)的不同方法，可以用多種方法訪問數(shù)據(jù)塊中的數(shù)據(jù)。
直接在訪問指令中寫明數(shù)據(jù)塊號(hào)，如：
L DB5.DBW10
T DB10.DBW20
L Motor_1.Speed 符號(hào)地址
另一種方法是“先打開后訪問”。在訪問某數(shù)據(jù)塊中的數(shù)據(jù)前，先“打開”這個(gè)數(shù)據(jù)塊，也就是將數(shù)據(jù)塊號(hào)(數(shù)據(jù)塊的起始地址)裝入數(shù)據(jù)塊寄存器。這樣，存放在數(shù)據(jù)塊中的數(shù)據(jù)就可利用數(shù)據(jù)塊起始地址加偏移量的方法來訪問。如：
OPN DB5
L DBW10
OPN DB10
T DBW20
在打開一個(gè)數(shù)據(jù)塊時(shí)，先打開的數(shù)據(jù)塊會(huì)自動(dòng)關(guān)閉(沒有專門的數(shù)據(jù)塊關(guān)閉指令)。由于有兩個(gè)數(shù)據(jù)塊寄存器(DB和DI寄存器)，因此，多可同時(shí)打開兩個(gè)數(shù)據(jù)塊。一個(gè)作為背景數(shù)據(jù)塊，數(shù)據(jù)塊的起始地址存儲(chǔ)在DI寄存器中；另一個(gè)作為共享數(shù)據(jù)塊，數(shù)據(jù)塊的起始地址存儲(chǔ)在DB寄存器中。打開背景數(shù)據(jù)塊，在調(diào)用FB時(shí)可以自動(dòng)實(shí)現(xiàn)。由于調(diào)用FB時(shí)使用DI寄存器，因此，一般不在FB程序中用OPN DI n指令打開數(shù)據(jù)塊。
3. 背景數(shù)據(jù)塊和共享數(shù)據(jù)塊
背景數(shù)據(jù)塊和共享數(shù)據(jù)塊有不同的用途。任何FB、FC或OB均可讀寫存放在共享數(shù)據(jù)塊中的數(shù)據(jù)。背景數(shù)據(jù)塊是FB運(yùn)行時(shí)的工作存儲(chǔ)區(qū)，它存放FB的部分運(yùn)行變量。調(diào)用FB時(shí)，必須指定一個(gè)相關(guān)的背景數(shù)據(jù)塊。作為規(guī)則，只有FB塊才能訪問存放在背景數(shù)據(jù)塊中的數(shù)據(jù)。
一般情況下，每個(gè)FB都有一個(gè)對(duì)應(yīng)的背景數(shù)據(jù)塊，一個(gè)FB也可以使用不同的背景數(shù)據(jù)塊。如果幾個(gè)FB需要的背景數(shù)據(jù)完全相同，為節(jié)省存儲(chǔ)器，則可以定義成一個(gè)背景數(shù)據(jù)塊，供它們分別使用。通過多重背景數(shù)據(jù)，也可將幾個(gè)FB需要的不同的背景數(shù)據(jù)定義在一個(gè)背景數(shù)據(jù)塊中，以優(yōu)化數(shù)據(jù)管理。各數(shù)據(jù)塊在CPU的存儲(chǔ)器中是沒有區(qū)別的，只是由于打開方式不同，才在打開時(shí)有背景數(shù)據(jù)塊和共享數(shù)據(jù)塊之分。原則上，任何一個(gè)數(shù)據(jù)塊都可以當(dāng)作共享數(shù)據(jù)塊或背景數(shù)據(jù)塊使用，實(shí)際上，一個(gè)數(shù)據(jù)塊由FB當(dāng)作背景數(shù)據(jù)塊使用時(shí)，必須與FB的要求格式相符。
數(shù)據(jù)結(jié)構(gòu)

Alfa Laval SattCon SC05-35B, Used, SC0535B, Fast Shipping
ALFA LAVAL ARC-GC-3A-2-77?V-20 VLV W/VITO SINGLE SEAT VALVE
1" Sanitary Alfa Laval Actuated Valve with ThinkTop E7
ALFA LAVAL AH11-GC-E-1.5-?T316-HNDL NSPP AH11GCE15T316H?ND
Alfa Laval Valve Basic Top Type SRC 1 3/8" dia (3414)
Alfa Laval Valve Basic Top Type SRC 1 3/8" dia (3415)
Alfa Laval Valve Basic Top Type SRC 1 3/8" dia (3416)
Alfa Laval Valve Basic Top Type SRC 25mm o/o (3410)
Alfa Laval Valve Basic Top Type SRC 25mm o/o (3411)
Alfa Laval Valve Basic Top Type SRC 25mm o/o (3412)
Alfa Laval Valve Basic Top Type SRC 25mm o/o (3409)
Alfa Laval SattCon OP45 SCOP45/DX485G, Used, SCOP45DX485G, Fast Shipping
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Alfa Laval SattCon OP45 SCOP45/DX232, Used, SCOP45DX232, Fast Shipping
Alfa Laval Valve *New* SRC-W-3A-3-7-2?0-J
40504 New In box, Alfa Laval 9630856472 Replacement Kit-Seal
Alfa Laval SattCon RAM30T 940-120-211, New, RAM30T, Fast Shipping
Alfa Laval SattCon CU05-25/SD32D Slimline, Used, CU0525SD32DSLI?MLINE, Fast
Alfa Laval SattCon SC05-20B, Used, SC0520B, Fast Shipping
Alfa Laval XACV-B/24, Used, XACVB24, Fast Shipping
Alfa Laval Valve Basic Top Type SRC (3413)
Alfa Laval Saunders Multiport Diverter Valve w/ 5 ports
Alfa Laval SattCon CU32, Used, CU32SATTCON, Fast Shipping
Alfa Laval SattCon CU33, Used, CU33SATTCON, Fast Shipping
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Alfa Laval SattCon ROM30 512K, New, ROM30Sattcon, Fast Shipping
Alfa-Laval: NB 26-24 (B21, B21) Heat Exchanger. No: 5180391 W
ALFA LAVAL GHK11 G&H (3 WAY SANITARY VALVE) 3" SST NEW
Alfa Laval SattCon SD24D Slimline, Used, SD24DSLIMLINE, Fast Shipping
Alfa Laval SattCon SC05-10B 976-001-003, Used, SC0510B, Fast Shipping
ALFA-LAVAL SMU 2A SPEED MONITORING UNIT 551-131-20
ALFA LAVAL ECA50 C ECA50-0100 SATT PROCESS CONTROLLER DIGITAL ABB 498047 40760
Alfa-Laval 1-Way A3 Plug Valve w/Tri-Clamp Ends SS
Alfa Laval SattCon IDPN, New, IDPNSATTCON, Fast Shipping
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Alfa Laval SattCon SD32D, Used, SD32DSATTCON, Fast Shipping
ALFA LAVAL DE LAVAL ENAMEL PORCELAIN SIGN

1734-VHSC5

NBPD0123 CCTV Adapter Pod 120 American Power Conversion-APC
APC BX1300LCD Back-UPS XS 780W 1300VA Input / Output -120V
NETSTAL APC-II-110.240?.6139 NSPP APCII110240613?9
ALBRECHT CT40 14APC MILLING CHUCK CAPACITY 1/8-9/16
ALBRECHT CT40 20APC MILLING CHUCK CAPACITY 1/8-3/4
TRACK BAR RACK ENDS TIE RODS INNER OUTER JEEP 5.2L 8CYL
APC Back-UPS RS BR1300G 1300 VA Tower UPS BR1300G
APC AP9630 Network Management Card, New No Box ~STSI
APC Smart Slot Triple Chassis AP9604S With Network Management Card AP9617
AR8164AKIT 6" Wide Data Cable Ladder American Power Conversion-APC
SC450RM1U 450VA 280W UPS RM 1U American Power Conversion-APC
M113A2 APC DESERT QUALITY DESKTOP TANK MODEL PERFECT GIFT & UNIQUE DESK DISPLAY
M113A2 APC DESERT QUALITY DESKTOP TANK MODEL PERFECT GIFT & UNIQUE DESK DISPLAY
APC SYMETRA PX LEAD ACID HOT SWAPPABLE BATTERY UNIT P/N SYBTU1-PLP
RBC7 Replacement Battery #7 American Power Conversion-APC
APC Back-UPS BR1300G Standby UPS - 1.30 kVA/780 WTower
APC Back-UPS BR1500G Line-interacti?ve UPS - 1.50 kVA/86
APW MCLEAN CR29-0426-G054 NSFP CR290426G054
APW MCLEAN M52-0816-032 GENESIS AIR CONDITIONER / HEATER
APW MCLEAN CR43-0826-002 NSFP CR430826002
APW MCLEAN CR43-0616-002 USPP CR430616002
APW MCLEAN T50-1226-G106A NSFP T501226G106A
APW MCLEAN 33-0416-G010 USPP 330416G010
APW MCLEAN M33-0426-G009 USPP M330426G009
APW MCLEAN T50-1226-G106A NSPP T501226G106A
APW MCLEAN HB11-0416-G307 NSFP HB110416G307
APW 06-01299300 Microsoft Architecture Ref. Platform
APW MCLEAN HB11-0416-G307 NSPP HB110416G307
APW MCLEAN CR43-0816-060H USPP CR430816060H
APW MCLEAN CR43-0816-066 USPP CR430816066
APW MCLEAN M17-0216-G009H USPP M170216G009H
APW Electronic Enclosure Air Conditioner M28-0216-G013H 2200 BTU PH 1 350 PSIG
APW MCLEAN 13-0116-G0014 USPP 130116G0014
APW MCLEAN XAC216T86 USPP XAC216T86
APW/McLean Electronic Air Conditioner, # M28-0216-G013H?, WARRANTY
APW MaxChassis II System Enclosure VME Mainframe
Returns: Not accepted
APW M28-0416-G007 Side Mount Electrical Enclosure Air Conditioner 4000 BTU PH 1
APW MCLEAN XR-2916-001 NSFP XR2916001
APW/McLean Electronic Air Cond M28-0216-G013 * * * WARRANTY * * *
APW MCLEAN XR-2916-001 USPP XR2916001

1734-VHSC5

Eye Chart software, visual acuity software. NEW
DIGITAL ACUITY SOFTWARE with Patient Education Pic/Vids
Visual Acuity Eye Chart software. NEW
RVSI ACUITY CM400 CCTV CAMERA
Juno Systems RV123/RV123P Binocular Vision/Acuity Screener w Stand
Acuity CiMatrix CM4000 B/W CCD Camera, super miniture
ADEPT TECH 30332-22350 USPP 3033222350
ADEPT TECH 90400-11140/XY?-HRS-140AH404 USPP 9040011140XYHR?S1
ADEPT TECH 10332-00716 USPP 1033200716
ADEPT TECH 10332-00714 USPP 1033200714
ADEPT TECH 30330-25000 USPP 3033025000
ADEPT TECH 90400-11180/XY?-HRS-180AH404A?D
ADEPT TECH 90400-11200/XY?-HRS-200AH404A?D
ADEPT TECH 10330-00710 USPP 1033000710
ADEPT TECH 30336-31000 USPP 3033631000
ADEPT TECH 10332-00655 USPP 1033200655
ADEPT TECH PA-4 USPP PA4
ADEPT TECH 30330-15000 USPP 3033015000
ADEPT TECH 10171-00020 USPP 1017100020
ADEPT TECH 10332-44710 USPP 1033244710
ADEPT TECH 10330-00600 USPP 1033000600
NIB ADEPT TECH 30340-40100 CONTROLLER CHASSIS MV-10
ADEPT TECH 10350-01064 USPP 1035001064
ADEPT TECH 10350-01044 NSFP 1035001044
ADEPT TECH 90400-30013 USPP 9040030013
ADEPT TECH 90402-40013 USPP 9040240013
ADEPT TECH 90402-40013/XY?-HRS013-S1B1-A?D USPP 9040240013XYHR?S0
ADEPT TECH 10330-15350 USPP 1033015350
ADEPT TECH 30330-12000 USPP 3033012000
ADEPT TECH 30340-40000 USPP 3034040000
ADEPT TECH 30340-20000 USPP 3034020000

1734-VHSC5

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