Allen-Bradley ControlLogix Instrukcja Użytkownika Strona 6

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2.3. ABCOMPACTLOGIX/CONTROLLOGIXSERIESPLCSSENDSTOMANY“CIP FORWARDOPEN”
AND“CIPFORWARDCLOSE”
WhenusingtheEtherNet/IPwithCIPcommunicationprotocolwithAllenBradleyCompactLogix/ControlLogixPLCs(and
withotherLogixseriesPLCs),theoptiontouse“Connected”or“Unconnected”isavailableinthe“MessageConfiguration”.
Bydefaultthe“Connected”checkboxisselectedandthereforeitwilladdadditionalmessages(CIPforwardopenandCIP
forwardclosemessages)foreachread/writeoperationwhennextmessageissentoutsidethemessagetimeoutperiod
(default=30sec).
Tolowertheonairtrafficthe"Connected"checkboxshouldbeunchecked(Unconnected).
ConnectedorUnconnectedoperationdescriptionforCIP:
Whenthe"Connected"checkboxischecked(Connected),ifthere'snotaCIPconnectionalreadyestablished,then
thecontrollersendsanopenforwardCIPconnectioncommandandwaitsforthegoodresponsepriorto
transmittingthereadorwritecommand.TheCIPconnectionremainsopenaslongasthereisactivity
priortothe
timeout(default=30sec).AnymessageinstructionsendingcommandstothesamedevicecanusethesameCIP
andTCPconnection.Ifthistimeoutisreached,acloseCIPconnectioncommandissent.
Whenthe"Connected"checkboxisunchecked(Unconnected),thecontrollerusestheUnconnectedCIP
serviceto
transmitthereadorwritecommand,sothereislessoverhead.
TheConnectiontimeoutisonapermessageinstructionbasisasshownbelow‐thisiswithregardstotheCIP
ConnectiononlynottheTCPconnection,whichisonlycontrolledbytheInactivityTimeout:
For the Logix controllers, the UnconnectedTimeout has to be individually adjusted in each message
instruction tag. The default is 30,000,000 microseconds (30 seconds):
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