Allen-Bradley ControlLogix Manuale Utente Scaricare il pdf (Pagina 7)

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Whenusing“Messagetype”EtherNet/IPCIPprotocol.

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Tolowertheon‐airtrafficun‐check“Connected”inthe“MessageConfiguration”method.

BelowisanexamplewhentheMessageTypeis"CIPDataTableRead"or"CIPDataTableWrite".Notethatthe

"Connected"checkboxshouldbeunchecked,thisisbecauseifyouleaveitchecked,thenevery

timetheMSGinstructionis

executedaCIPconnection(withCIPopenmessage)willbeestablishedandbroken(withCIPclosemessage)whichadds

unnecessarilytothenetworktraffic.

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WhencommunicationbetweenControlLogix/CompactLogixandotherLogixseriesPLCs.

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ThesePLCs/ControllerusuallyuseEtherNet/IPCIPunconnectedprotocoltocommunicatebetweeneachother.

Note(seebelow)thatwhentheMessageTypeis"SLCTypedRead"or"SLCTypedWrite",theLogixMSGinstructionalways

usesanUnconnectedCIP(noticethatthe"Connected"checkboxisuncheckedandgrayedout).Forexample

thisisused

whenusingPCCCencapsulatedinEtherNet/IPcommand.OthersthanreadorwriteforSLCtypesarenotdescribedinthis

document.

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Allen-Bradley ControlLogix Manuale Utente Pagina 7