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4 缍�(w菐ng)绲�(lu貌)寤舵檪鍒嗘瀽
銆€銆€鐐轰簡灏嶅湒1鎵€绀虹郴绲�(t菕ng)鐨勫鏅傛€ф湁鏇存竻鏅扮殑瑾嶈瓨锛屾垜鍊戝彲浠ュ垎鏋愯┎绯荤当(t菕ng)鐨勬渶澶у欢鏅傘€�
銆€銆€鍦ㄤ互涓嬫儏娉佺郴绲�(t菕ng)鏈冪敘(ch菐n)鐢熸渶澶у欢鏅傦細锛�1锛塕TU鐨勯熆鎳夋檪闁撴渶闀�;锛�2锛夌稉(j墨ng)閬嶮AP811鏅傛湁鏈€澶ф矕绐佹鏁�(sh霉);锛�3锛変氦鎻涙鐢�(ch菐n)鐢熸渶澶х殑鎺掗殜寤舵檪銆�
銆€銆€鏍规摎(j霉)optilogic鎻愪緵鐨勬暩(sh霉)鎿�(j霉)锛屽叾浠ュお缍�(w菐ng)RTU鐨勯熆鎳夋檪闁撳琛�1鎵€绀�銆傚湪瑭茬郴绲�(t菕ng)涓簳鍙g殑RTU鏈€澶ч熆鎳夋檪闁撶偤閲囬泦3鍙f补浜曟暩(sh霉)鎿�(j霉)鐨凴TU鎵€鐢�(ch菐n)鐢熺殑闊挎噳鏅傞枔锛屽叾涓寘鎷�3鍊嬫暩(sh霉)瀛楅噺妯″鍜�3鍊嬫ā鎿噺妯″锛屽叾闊挎噳鏅傞枔鐐猴細
銆€銆€Tres = Tbas + 3脳Tmd + 3脳Tma
銆€銆€= 1.6+0.3+3脳0.2+3脳0.73
銆€銆€= 4.69ms 锛�1锛�
銆€銆€鍏朵腑Tres鐐篟TU绺介熆鎳夋檪闁�锛孴bas锛孴md锛孴ma鍒嗗垾鐐篟TU姗熸灦銆侀枊闂�(gu膩n)閲忔ā濉婂拰妯℃摤閲忔ā濉婄殑闊挎噳鏅傞枔銆�
銆€銆€Think&Do鐨勯檺鍒堕熆鎳夋檪闁撳姛鑳借姹傚湪瑷�(sh猫)瀹氭檪闁撳収(n猫i)鏀跺埌RTU鐨勯熆鎳変俊鎭紝鑻ュ湪瑷�(sh猫)瀹氱殑鏅傞枔鍏�(n猫i)鏈緱鍒扮浉鎳変俊鎭墖鏂烽枊鑸囪┎RTU鐨勯€f帴銆傚埄鐢ㄨ┎鍔熻兘灏�5鍊婻TU閫氶亷MAP811绲勬垚鐨勭郴绲�(t菕ng)閫茶浜嗛熆鎳夋檪闁撴脯瑭︼紝绲�(ji茅)鏋滃琛�2鎵€绀�銆傞€氶亷琛�2鍙互鐪嬪嚭鐣惰ō(sh猫)瀹氬€煎埌15ms浠ヤ笂鏅傞暦鏅傞枔鍏�(n猫i)閮芥矑鏈塕TU琚柗闁嬶紝鍓囧彲瑾嶇偤缍�(j墨ng)閬嶮AP811鐢�(ch菐n)鐢熸渶澶у欢鏅傜偤锛�
銆€銆€Tmap = 15-Tres = 15 - 4.69 = 10.31ms 锛�2锛�
銆€銆€鍊煎緱涓€鎻愮殑鏄�锛岃嫢鐩存帴閲囩敤缍�(w菐ng)绶氬皣RTU鑸囦氦鎻涙鐩歌伅(li谩n)锛屾暣鍊嬬郴绲�(t菕ng)鐨勫欢鏅傚皣鍙笡灏慚AP811鎵€鐢�(ch菐n)鐢熺殑寤舵檪锛屽繀灏囧ぇ澶у寮风郴绲�(t菕ng)鐨勫鏅傛€�銆�
銆€銆€浜ゆ彌姗熷瓨鍎茶綁(zhu菐n)鐧�(f膩)鏈€澶у欢鏅傜敘(ch菐n)鐢熷湪鏈�4鍊嬪箑鍚屾檪鍒伴仈锛堝湒1锛�锛岃€岄€欐檪鐢�(ch菐n)鐢熺殑寤舵檪鏈冨皬浜�1ms[1]銆傞€欐ǎ鏁村€嬬郴绲�(t菕ng)鐨勬渶澶у欢鏅備笉鏈冭秴閬�16ms锛屽皪浜庝竴鑸殑绯荤当(t菕ng)瀹屽叏鍙互婊胯冻瀵︽檪鎬ц姹�銆傝€屽湪瀵﹂殯涓垜鍊戝皣闄愬埗闊挎噳鏅傞枔瑷�(sh猫)瀹氱偤20ms锛岄€欐ǎ鍙互淇濊瓑绯荤当(t菕ng)闀锋檪闁撲笉鏈冩湁RTU琚柗闁嬮€f帴锛屽嵆浣垮伓鐖炬湁RTU琚柗闁�锛岄€氶亷Think&Do鐨凴escan鍔熻兘鍙噸鏂伴€f帴銆�
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琛�2 缍�(j墨ng)MAP811鍚嶳TU鐨勯熆鎳夋檪闁�

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鍙冭€冩枃鐛�
銆€銆€[1] Kyung Chang Lee锛孭erformance evaluation of switched Ethernet for real-time industrial communications锛孋omputer Standards & Interfaces锛�2002锛�12锛�
銆€銆€[2] Optilogic RTU Manual锛孫ptimation.Inc锛�2000
銆€銆€[3] 鐔婅偛鎮呯瓑锛屽伐妤�(y猫)浠ュお缍�(w菐ng)鍦ㄦ帶鍒剁郴绲�(t菕ng)涓殑鎳夌敤鍓嶆櫙锛岃嚜鍕曞寲鍎€琛�锛�2002锛�9锛�
銆€銆€[4] 鑳¢亾鍏冪瓑锛岃▓绠楁灞€鍩熺恫(w菐ng)锛屾竻鑿ぇ瀛稿嚭鐗堢ぞ锛�2002
銆€銆€[5] 棣ぇ鐐虹瓑锛屽緸淇℃伅闆嗘垚鐪嬬従(xi脿n)鍫寸附绶氱殑鐧�(f膩)灞曪紝鍐堕噾宸ユキ(y猫)鑷嫊鍖�锛�2001锛�6锛�
銆€銆€[6] 闄芥啿鎯犵瓑锛岀従(xi脿n)鍫寸附绶氭妧琛�(sh霉)鍙婂叾鎳夌敤锛屾竻鑿ぇ瀛稿嚭鐗堢ぞ锛�1999