Allen-Bradley ControlLogix Manuale Utente Scaricare il pdf (Pagina 6)

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2.3. ABCOMPACTLOGIX/CONTROLLOGIXSERIESPLCSSENDSTOMANY“CIP FORWARDOPEN”

AND“CIPFORWARDCLOSE”

WhenusingtheEtherNet/IPwithCIPcommunicationprotocolwithAllen‐BradleyCompactLogix/ControlLogixPLCs(and

withotherLogixseriesPLCs),theoptiontouse“Connected”or“Unconnected”isavailableinthe“MessageConfiguration”.

Bydefaultthe“Connected”checkboxisselectedandthereforeitwilladdadditionalmessages(CIPforwardopenandCIP



forwardclosemessages)foreachread/writeoperationwhennextmessageissentoutsidethemessagetimeoutperiod

(default=30sec).

Tolowertheon‐airtrafficthe"Connected"checkboxshouldbeunchecked(Unconnected).

ConnectedorUnconnectedoperationdescriptionforCIP:



Whenthe"Connected"checkboxischecked(Connected),ifthere'snotaCIPconnectionalreadyestablished,then

thecontrollersendsanopenforwardCIPconnectioncommandandwaitsforthegoodresponsepriorto

transmittingthereadorwritecommand.TheCIPconnectionremainsopenaslongasthereisactivity

priortothe

timeout(default=30sec).AnymessageinstructionsendingcommandstothesamedevicecanusethesameCIP

andTCPconnection.Ifthistimeoutisreached,acloseCIPconnectioncommandissent.

Whenthe"Connected"checkboxisunchecked(Unconnected),thecontrollerusestheUnconnectedCIP

serviceto

transmitthereadorwritecommand,sothereislessoverhead.

TheConnectiontimeoutisonapermessageinstructionbasisasshownbelow‐thisiswithregardstotheCIP

ConnectiononlynottheTCPconnection,whichisonlycontrolledbytheInactivityTimeout:

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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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Allen-Bradley ControlLogix Manuale Utente Pagina 6