Allen-Bradley ControlLogix Uživatelský manuál stáhnout pdf (Strana 10)

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3. VIPER

3.1. SETUPVIPERIN ROUTERMODE(INSTEAD OFBRIDGEMODE)

Info:ViperBridgemodecannotfilterkeepaliveandcannotoperateinTCPproxymode.

IfthesystemhasveryfewunitsandfewmessagesViperBridgemodecouldbeused.ButforlargersystemsandPLCdoing

manykeepalives,oron‐airnetworkbeingcontentious,itmayberequiredtouse

routermode.Routermodeallows

retransmissionofmessageslostduetoon‐aircontention.Bridgemodeonlydoesbroadcastswithoutretries.InBridge

modetheapplicationneedstoretrylostmessages.

3.2. FILTERINGTCPKEEPALIVEWITHVIPERTCP PROXYMODE

WhenusingTCPprotocolandhavingPLCswheretheTCPkeepaliveratecannotbecontrolled,itisimportanttoenable

ViperTCP(OIPproxy)mode.ThisrequiresthatallVipersareconfiguredinroutermode(ViperBridgemodecannotfilter

keepaliveandcannotoperateinTCPproxymode).

Note:ForPLCs

wherethekeepalivecanbecontrolledandarerequired,setkeepaliveto4minutes.

OneoftheViper'sTCPproxymodeusagesallowsfilteringofkeepalivemessagesandpreventsthemtobesentovertheair.

Withoutthisfiltering,severalPLCssendingkeepalivemessagescouldeasilyloadtheon‐air

network.

SeeViperusermanualandWebpagestoenableproxy.BydefaultViperproxymodeisenabled.SeeViperWebpage

Advancedsetup‐>OIPoptimizations.AlsounderNetworkmanagement‐>NeighborTables(neighbormanagement)make

surethatneighborsareconfiguredwiththeproxyattribute.

3.3. REPLACINGORRESETTINGAVIPERUSINGPROXYMODEWITHOUT RESTARTINGPOLLING

Whenreplacingorresetting:aremoteViper,aViperusedasarepeater,orevenamasterViperconnectedthrougha

switch,theViperproxycontextislostandwilloperatewithouttheproxybenefit.

ToreestablishTCPproxycontextfortheTCPconnection,thePLCneedstoclosetheold

TCPconnectionandre‐openanew

TCPconnection.ThereforenormallyafterdoingVipermaintenancethemasterPLCneedstoberestarted.FutureViper

firmwaremayreestablishproxyautomatically.

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Allen-Bradley ControlLogix Uživatelský manuál Strana 10