HENF327886R0001 DSC是船舶在中高頻波段發射遇險報警和廣泛呼喚利用的一個廣泛呼喚體系，由岸臺
發射收妥關照。DSC呼喚大抵分為遇險和寧靜呼喚、一樣尋常呼喚兩類。在GMDSS的
地面通訊體系中，初始遇險通訊是由DSC來完成的。DSC提供近間隔（VHF）、中間隔
（MF）和遠間隔（HF）遇險報警。在遇險呼喚時，主動將發信機轉換到設定的遇險
頻率上，按設定的報警方法舉行報警。
HENF327886R0001 HENF327886R0001
plc的程序一定要正確，并要經過實際工作驗證，證明其能夠正確工作。這是對plc程序的zui根本的要求，若這一點做不到，其它的再好也沒有用。
要使程序正確，一定要準確的使用指令，正確的使用內部器件。準確的使用指令與準確理解指令相，為此對指令含義和使用條件一定要弄清楚。必要時，可編些小程序對一些不清楚的指令作些測試。
同一指令，由于plc的出廠批次不同或是plc的系列型號的不同，一些指令細節有可能不一樣，應仔細查閱編程手冊。
內部器件正確使用也是重要的。如有的plc有掉電保護，有的plc沒有。一定要做到該掉電保護的一定要用掉電保護的器件，反之則不能用。
總之，要準確的使用指令，正確使用內部器件，使所編的程序能正確要作，這是對plc程序zui根本的要求。
2、可靠性
程序不僅要正確，還要可靠。可靠反映著plc程序的穩定性，這也是對plc程序的基本要求。
有的plc程序，在正常的工作條件下或合法操作時能正確工作，而出現非正常工作條件（如臨時停電，又很快再通電）或進行非法操作（如一些按鈕不按順序按，或同時按若干按鈕）后，程序就不能正常工作了。這種程序，就不大可靠，或說不穩定，就是不好的程序。
好的plc程序對非正常工作條件出現，能予以識別，并能使其與正常條件銜接，可使程序適應于多種情況。好的plc程序對非法操作能予以拒絕，且不留下“痕跡”。只接受合法操作。
聯鎖是拒絕非法操作常用的手段，繼電電路常用這個方法，plc也可繼承這個方法。
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廈門岳航計算機工程有限公司
：黃華新 ：2339016238
：
（注黃華新收）
：2339016238
地址；廈門思明區湖濱東路湖光大廈18樓A單元
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