LAGU320/160-12/LD240-175M01-00US現(xiàn)貨

早在2000年，澳大利亞馬盧奇污水處理廠就曾遭遇到攻擊，在前后三個多月的時間里，總計約100萬升未經(jīng)處理的污水直接經(jīng)雨水渠了公園、河流等自然水系。此番行為直接了當?shù)卮罅亢Ｑ笊锼劳?，污水臭氣熏天，給所在區(qū)域帶來嚴重生態(tài)災難。 2003年1月，美國俄亥俄州Dis-Besse核電站和其他電力設備受到SQLSlamme蠕蟲攻擊，在數(shù)小時內(nèi)網(wǎng)絡數(shù)據(jù)傳輸量劇增，該核電站計算機處理速度變緩、參數(shù)顯示和控制計算機無法運作。 彼時的入侵事件就已為工控防護敲響了警鐘，但真正拉開保衛(wèi)工業(yè)信息序幕的則是臭名昭著的“震網(wǎng)”事件。 2010年6月，震網(wǎng)Stuxnet被發(fā)現(xiàn)，它是個專門定向攻擊真實基礎設施的“蠕蟲”。其利用當時微軟尚未發(fā)現(xiàn)的幾個漏洞，成功偷襲了伊朗Natanz核電站，造成大量離心機損毀；此后的2012年，美國加州的Chevron石油公司對外稱，他們的計算機曾受到該震網(wǎng)病襲擊；隨后，美國BakerHughes、ConocoPhillips和Marathon等石油公司也相繼發(fā)表聲明稱，其計算機也感染了震網(wǎng)。他們發(fā)布警告，一旦侵害了真空閥，就會造成離岸鉆探設備失火、人員傷亡和生產(chǎn)停頓等重大事故。

1．用I0.0控制接在Q4.0～Q4.7上的8個彩燈循環(huán)移位，用T37定時，每0.5 s移1位，首次掃描時給Q4.0～Q4.7置初值，用I0.1控制彩燈移位的方向，試設計語句表程序。
2．在按鈕I4.0按下后Q4.0變?yōu)?狀態(tài)并自保持，I0.1輸入3個脈沖后(用C1計數(shù))T37開始定時，5 s后Q4.0變?yōu)?狀態(tài)，同時C1被復位，在可編程序控制器剛開始執(zhí)行用戶程序時，C1也被復位，試設計梯形圖。
3．當I0.1為ON時，定時器T2開始定時，產(chǎn)生每秒一次的周期脈沖。T2每次定時時間到時調(diào)用一個子程序，在子程序中將模擬量輸入PIW256的值送MWl0，試設計主程序和子程序。
4. 多個傳送帶啟動和停止示意圖如圖5.15所示。初始狀態(tài)為各個電機都處于停止狀態(tài)。按下啟動按鈕后，電動機M1通電運行，行程開關SQl有效后，電動機M2通電運行，行程開關SQ2有效后，M1斷電停止，其他傳動帶動作類推。整個系統(tǒng)循環(huán)工作。按下停止按鈕后，系統(tǒng)把目前的工作進行完后停止在初始狀態(tài)。試設計其梯形圖并寫出語句表程序。

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LAGU320/160-12/LD240-175M01-00US

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LAGU320/160-12/LD240-175M01-00US

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LAGU320/160-12/LD240-175M01-00US