Allen-Bradley ControlLogix Manual de usuario descargar pdf (Pagina 5)

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aresentforeachcloseandre‐openoftheTCPconnection.Thisaddsalotofon‐airtrafficandimpactsthesystem

performance.

NotewhenusingdifferentinactivitytimeoutvaluesformessageswiththesameTCPconnection:

WhendifferentmessagesforthesameremotesharethesameTCPconnection,

eachdifferentmessage’sinactivitytimeout

wouldrestartthetimeouttimer.Messageexample:msg1inactivity‐60,msg2inactivity‐100,msg3inactivity‐30.These

messagesarethensentasfollows:msg1issent,msg2issent,msg3andthenawaitisdone.Sincethelastmessagewas

msg3withinactivitytimeout

of30seconds,theTCPconnectionwouldcloseafter30secondsofmsg3.

Settingexampleusingcustominactivitytimeout(100sec).

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SummaryonTCPconnectiontimeout(inactivitysetting)

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SincethelongestinactivitytimeoutperTCPconnectionwitharemoteunit(PLC/RTU)is120seconds(basedonmessage

inactivitymaxof120seconds),itisimportantthateachremote(PLC/RTU)ispolledwiththe120secondperiodtoavoid

extratrafficresultingfromadditionalTCP/IPopenandcloseconnection

messages.Forsystemswherepollingisdone

infrequently(>120sec)theadditionalTCPtrafficneedstobeconsideredforthesystemtrafficplan.

Fornormaloperationtheinactivitytimeoutdoesnotneedtobespecifiedinthe“Path”setting.Masterandremotesshould

besetthisway,especiallyifremote

PLCssendunsolicitedmessagesorinitiatecommunicationwithotherremotes.Ifa

systemhasamixofPLCs(CompactLogix/ControlLogixwithMicroLogix/SLC),thenalsorefertoCalAmp’s“Allen‐BradleyPLC

forViperSystem”supportbulletinavailableonCalAmp’sWEBsiteundersupport.

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Allen-Bradley ControlLogix Manual de usuario Pagina 5