PSM-EG-RS232/RS422-P/4K現貨

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100萬升未經處理的污水直接經雨水渠了公園、河流等自然水系。此番行為直接了當地大量海洋生物死亡，污水臭氣熏天，給所在區域帶來嚴重生態災難。 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，在數小時內網絡數據傳輸量劇增，該核電站計算機處理速度變緩、參數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，但真正拉開保衛工業信息序幕的則是臭名昭著的“震網”事件。 2010年6月，震網Stuxnet被發現，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現的幾個漏洞，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病襲擊；隨后，美國BakerHughes、ConocoPhillips和Marathon等石油公司也相繼發表聲明稱，其計算機也感染了震網。他們發布警告，一旦侵害了真空閥，就會造成離岸鉆探設備失火、人員傷亡和生產停頓等重大事故。

Network 7 復位累計啟動次數的計數器
A #Reset_Maint
A #Maint
JCN END
L 0
T #Starts
END：NOP 0
6. 生成閥門FC
入口和進料閥以及排料閥的功能包含以下邏輯功能：
(1) 一個用于打開閥門的輸入，一個用于關閉閥門的輸入。
(2) 互鎖允許閥門被打開。互鎖狀態存儲在OB1的臨時局域數據(L堆棧)中(“Valve_enable”)，并且在閥門的FC被處理時與打開和關閉的輸入進行邏輯組合
由于被調用的塊必須在調用塊之前生成，因此閥門的FCl功能必須在OB1之前生成。STL編程語言的FCl程序部分如下：
Network l 打開關閉和鎖存
A(
O #Open
O #Valve
)
AN #Close
= #Valve
Network 2 顯示“閥門打開”
A #Valve
= #Dsp_Open
Network 3 顯示“閥門關閉”
AN #Valve
= #DSp_Closed

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PSM-EG-RS232/RS422-P/4K

￡3000 ex VAT, new in 2009, Full working order
Returns: Accepted
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PSM-EG-RS232/RS422-P/4K

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PSM-EG-RS232/RS422-P/4K

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