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賽威MCH41A0750-503-4-0T08276854上頭
賽威MCH41A0750-503-4-0T08276854上頭
賽威MCH41A0750-503-4-0T08276854上頭
"每一次跌倒都是向成功邁進(jìn)的一步，帶著傷痕與智慧走向明天"

中海德（福建）工業(yè)設(shè)備有限公司是一家長年專業(yè)從事****品牌ABB DSQC機(jī)器人系統(tǒng)模塊備件及西門子摩爾（Siemens Moore APACS）控制系統(tǒng)零部件銷售企業(yè)、我們售出的備品備件均提供一年的質(zhì)量保證、并且都經(jīng)過了嚴(yán)格的測試和認(rèn)證。

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公司名稱：中海德（福建）工業(yè)設(shè)備有限公司

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EMAIL：2851617308@qq.com

官網(wǎng)：www.zhdfj.com

地址：福州市閩侯縣正榮財(cái)富中心SOHO3號樓8樓820中海德公司

IEC61131-3是PLC的編程語言標(biāo)準(zhǔn)。IEC61131-3是**上*一個(gè)，也是至今為止**的工業(yè)控制領(lǐng)域的編程語言標(biāo)準(zhǔn)。IEC61131-3有三種POU：程序、功能塊和功能。

功能是有多個(gè)輸入?yún)��?shù)和一個(gè)輸出參數(shù)（返回值）的POU，返回值的名稱與功能的名稱相同，需要定義返回值的數(shù)據(jù)類型。調(diào)用具有相同輸入值的功能總是返回相同的結(jié)果。功能可以調(diào)用其他功能，但是不能調(diào)用功能塊或程序。功能可定義的局部變量有VAR和VAR_INPUT。

功能塊是有多個(gè)輸入/輸出參數(shù)和內(nèi)部存儲單元的POU，功能塊的輸出參數(shù)值與其內(nèi)部存儲單元的值有關(guān)。功能塊可以調(diào)用其他功能 塊或功能，但是不能調(diào)用程序。 在調(diào)用功能塊之前，必須在要調(diào)用功能塊的POU中為每次調(diào)用聲明功能塊的實(shí)例，操作系統(tǒng)將為每次調(diào)用分配功能塊**的存儲區(qū)。

先了解一下空預(yù)器的驅(qū)動方式：中心驅(qū)動和圍帶驅(qū)動。顧名思義，中心驅(qū)動就是空預(yù)器的中心處進(jìn)行電機(jī)驅(qū)動，而圍帶驅(qū)動就是從空預(yù)器的側(cè)面進(jìn)行電機(jī)驅(qū)動。他們的廠家代表分別為“哈鍋”和“上鍋”，各有特點(diǎn)。

     空預(yù)器的起動必須通過變頻器進(jìn)行“軟啟動”，好比手動擋汽車的離合器“緩慢抬起”，否則容易“熄火”，所以必須使用變頻器。由于空預(yù)器起動以后一直保持勻速旋轉(zhuǎn)，約1轉(zhuǎn)/分鐘（電機(jī)工頻50Hz），考慮到變頻器**50Hz輸出的穩(wěn)定性不如“開關(guān)直接驅(qū)動”，于是就有了“空預(yù)器變頻切工頻”。

下面就來模擬一遍空預(yù)器變頻切工頻。

     dcs指令啟動空預(yù)器。

     空預(yù)器主電機(jī)變頻器啟動，開始由0Hz加速至50Hz，到達(dá)50Hz后，變頻器發(fā)出“頻率到達(dá)”指令，控制回路斷開變頻器，經(jīng)過“延時(shí)1”，吸合工頻接觸器。空預(yù)器主電機(jī)變頻切工頻結(jié)束。
MC07B0003-2B1-4-00
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