Allen-Bradley ControlLogix Manual do Utilizador descarregar pdf (Página 8)

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SummaryofConnectedorUnconnectedoperation

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With“Connected”optionselectedandpollingintervalbetweenMessagesforthesameremoteCIPconnectionislonger

thanthe“UnconnectedTimeout”(default30seconds),“CIPForwardOpen”and“CIPForwardClose”messagesadd4extra

on‐airmessages(includesmsgreply)foreachunitpolled.Ifeachpollis2messages

(msgandreply)the4extramessages

increasethemessageload(on‐air)by200%.

Therefore"Connected"checkboxshouldbeunchecked(Unconnected)toavoidsending)“CIPForwardOpen”and“CIP

ForwardClose”messages.If“Connected”isrequiredthenincreasethe“UnconnectedTimeout”and“ConnectionRate”

timeouttoavaluegreaterthanthepolling

intervalperremote(useprecautionwiththis).

TimeoutsusedformessageresponsesoverEtherNet/IP“Connected”or“Unconnected”shouldnotbetooshort,therefore

shouldnotbesetlowerthan15sec(normally)intheeventitisrequiredbeinglowerthan30secforapplicationlevel

retransmission.TheTCP/IPcommunication

driverdoesitsownretransmissionsandwillnotrequireapplication

retransmissionsofmessagessinceaTCPconnectionwillnotlooseamessageunlesstheconnectionterminatesnormallyor

duetoaproblem.ThereforewithTCPlongertimeoutswithinreasonareok.Longertimeouts(ex30sec)areoksincethey

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Allen-Bradley ControlLogix Manual do Utilizador Página 8