DMT10-1111S01現(xiàn)貨
本公司專業(yè)銷售大型進(jìn)口各種品牌DCS系統(tǒng)模塊備件:
ABB Advant OCS,ABB MOD 30/MODCELL,ABB MOD 300,ABB Bailey INFI 90,
ABB Procontic,ABB Procontrol,
H&B Contronic,Moore APACS,Moore Panel Controllers,Rosemount RS-3,
Siemens Iskamatic,Siemens Simatic S5,Siemens Simatic C1,
Yokogawa Centum XL,Yokogawa microXL,
FOXBORO I/A,GE FANUC,
Honeywell QCS,Honeywell TDC系列,Honeywell S9000,
HITACHI,Mitsubishi PLC,Motorola MVME,ALSOM MVME,Other VME,TOSHIBA等大型模組,
有著充足的庫存,交貨期快,庫存價值大約3億,歡迎來電查詢
公司名稱:福州聚福興自動化有限公司
5.1.1 S7-300編程方式簡介
S7-300系列PLC的編程語言是STEP 7。STEP 7繼承了STEP 5語言結(jié)構(gòu)化程序設(shè)計的優(yōu)點(diǎn),用文件塊的形式管理用戶編寫的程序及程序運(yùn)行所需的數(shù)據(jù)。如果這些文件塊是子程序,則可以通過調(diào)用語句,將它們組成結(jié)構(gòu)化的用戶程序。這樣,PLC的程序組織明確,結(jié)構(gòu)清晰,易于修改。
為支持結(jié)構(gòu)化程序設(shè)計,STEP 7用戶程序通常由組織塊(OB)、功能塊(FB)或功能塊(FC)等三種類型的邏輯塊和數(shù)據(jù)塊(DB)組成。
組織塊(OB)是系統(tǒng)操作程序與用戶應(yīng)用程序在各種條件下的接口界面,用于控制程序的運(yùn)行。OB塊根據(jù)操作系統(tǒng)調(diào)用的條件(如時間中斷、報警中斷等)可分成幾種類型,這些類型有不同的優(yōu)先級,高優(yōu)先級的OB可以中斷低優(yōu)先級的OB。每個S7 CPU包含一套可編程的OB塊(隨CPU而不同),不同的OB塊執(zhí)行特定的功能。
OB1是主程序循環(huán)塊,在任何情況下,它都是需要的。根據(jù)過程控制的復(fù)雜程度,可將所有程序放入OB1中進(jìn)行線性編程,或?qū)⒊绦蛴貌煌倪壿媺K加以結(jié)構(gòu)化,通過OB1調(diào)用這些邏輯塊,并允許塊間的相互調(diào)用。塊的調(diào)用指令中止當(dāng)前塊(調(diào)用塊)的運(yùn)行調(diào)用,然后執(zhí)行被調(diào)用塊的所有指令。一旦被調(diào)用的塊被完成,執(zhí)行調(diào)用指令的塊繼續(xù)執(zhí)行調(diào)用指令后的指令。調(diào)用塊可以是任何邏輯塊,被調(diào)用塊只能是功能塊(除OB外的邏輯塊)。圖5.1所示是一個STEP 7調(diào)用實例。除了OB1,操作系統(tǒng)可以調(diào)用其它的OB塊以響應(yīng)確定事件。其它可用的OB塊隨所用的CPU性能和控制過程的要求而定。
功能塊(FB、FC)實際上是用戶子程序,分為帶“記憶”的功能塊FB和不帶“記憶”的功能塊FC。前者有一個數(shù)據(jù)結(jié)構(gòu)與該功能塊的參數(shù)表完全相同的數(shù)據(jù)塊(DB)附屬于該功能塊,并隨功能塊的調(diào)用而打開,隨功能塊的結(jié)束而關(guān)閉。該附屬數(shù)據(jù)塊叫做背景數(shù)據(jù)塊(Instance Data Block),存放在背景數(shù)據(jù)塊中的數(shù)據(jù)在FB塊結(jié)束時繼續(xù)保持,即被“記憶”。功能塊FC沒有背景數(shù)據(jù)塊,當(dāng)FC完成操作后數(shù)據(jù)不能保持。
數(shù)據(jù)塊(DB)是用戶定義的用于存取數(shù)據(jù)的存儲區(qū),可以被打開或關(guān)閉。DB可以是屬于某個FB的情景數(shù)據(jù)塊,也可以是通用的全局?jǐn)?shù)據(jù)塊,用于FB或FC。S7 CPU還提供標(biāo)準(zhǔn)系統(tǒng)功能塊(SFB、SFC),它們是預(yù)先編好的,經(jīng)過測試后集成在S7 CPU中的功能程序庫。用戶可以直接調(diào)用它們,高效地編制自己的程序。由于它們是操作系統(tǒng)的一部分,因此不需將其作為用戶程序下載到PLC。與FB塊相似,SFB需要一個背景數(shù)據(jù)塊,并需將此DB塊作為程序的一部分安裝到CPU中。不同的CPU提供不同的SFB、SFC功能。
系統(tǒng)數(shù)據(jù)塊(SDB)是為存放PLC參數(shù)所建立的系統(tǒng)數(shù)據(jù)存儲區(qū)。用STEP 7的S7組態(tài)軟件可以將PLC組態(tài)數(shù)據(jù)和其它操作參數(shù)存放于SDB中。
功能塊編程及調(diào)用
功能塊由兩個主要部分組成:一部分是每個功能塊的變量聲明表,變量聲明表聲明此塊的局部數(shù)據(jù);另一部分是邏輯指令組成的程序,程序要用到變量聲明表中給出的局部數(shù)據(jù)。
當(dāng)調(diào)用功能塊時,需提供塊執(zhí)行時要用到的數(shù)據(jù)或變量,也就是將外部數(shù)據(jù)傳遞給功能塊,這被稱為參數(shù)傳遞。參數(shù)傳遞的方式使得功能塊具有通用性,它可被其它的塊調(diào)用,以完成多個類似的控制任務(wù)。
1. 變量聲明表(局部數(shù)據(jù))
每個邏輯塊前部都有一個變量聲明表,在變量聲明表中定義邏輯塊用到的局部數(shù)據(jù)。局部數(shù)據(jù)分為參數(shù)和局部變量兩大類,局部變量又包括靜
APC AP8858NA3 Rack PDU 2G, Metered, ZeroU
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APC Smart UPS 1500 SUA1500RM2U
APC AP7831 Rack PDU Zero U 15A/120V
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1 NEW ABB S3H225DS0AS8AP?C 225 AMP SACE S3 CIRCUIT BREAKER NIB
APC AP7998 Power Distribution Unit Switched Rack PDU 16A 208V-Input 0U Zero
APC BP420S Back-UPS Pro
APC RBC24 Replacement Battery #24
APC Master Switch Network Controller
APC SMT750 750VA/500 Watts UPS
APC SMART-UPS SMT750 750VA LCD 120V SMART-UPS 500W RETA
RBC26 Replacement Battery #26 American Power Conversion-APC
APC AP9618 Network Management Card, New Open Box ~STSI
Snap-on Classic 78 Riser 54"
STEERING RACK ENDS DODGE RAM 2500 3500 2004/06 4X4
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PANEL APC BUTTON SWITCH STOP GUN COOLANT 2711-80-33 HITACHI SEIKI CNC HORIZONTAL
EO Technics VER:APC2.0 S/N:2010585 Auto Power Controller
APC SMC1000 Smart UPS C 1000VA
APC Back-UPS BR1000G Line-interacti?ve UPS 1000VA/600W
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INNER OUTER TIE ROD ENDS UPPER LOWER BALL ENDS ADJUSTING SLEEVE F 250 SUPER DUTY
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APC Back-UPS RS 800 BR800BLK Battery Back Up Power Supply
APC Back- UPS RS 800VA Tower UPS - 800VA Power Conversion
Hewlett Packard ( HP ) / Agilent 85037-60001 APC-3.5 Scalar Open/Short
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DMT10-1111S01
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AMETEK 1726 Digital Tachometer
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~ Ametek Lamb 116355-01 Vacuum Cleaner Motor M-W
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USG 659638AA3CD3G0?0 Solfrunt U.S. Guage AMETEK Stainless 659
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Ametek Single Stage Bypass Motor 5.7", 110V, 800W
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DMT10-1111S01
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DMT10-1111S01
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