User manual

Diagnostics and Troubleshooting ILX34-AENWG ♦ Point I/O Platform
User Manual Wireless POINT I/O Adapter
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Page106of209 ProSoftTechnology,Inc.
 September19,2011
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4.2.1 Sources of Interference
WhiletheILX34‐AENWGoperatesreliablyinindustrialenvironments,interference(radio"noise")
maystilloccur.Radiosaredesignedtodetectspecificradiofrequencies.An"interferer"isan
unwantedsignalthathasbeentransmittedatthesamefrequencythattheradiowasdesignedto
detect.
Byfar,themostcommonsourceof
interferenceisfromother802.11networks.SinceI/O
messagingislatencydependent,itsimportantthatother802.11networksdonotinterferewith
theI/Onetwork.Itisrecommendedthatthenetworkuseachannelfreeofinterferencefrom
other802.11devices.
Therearemanyman‐madeandnaturalsourcesof
electromagneticinterference(lightning,power
lines,switchingpowersupplies,fluorescentlighting,microwaveovens,cordlessphones,andso
on).Todecreasetheeffectsofinterferenceonnetworkfunction:
 Useadirectional(highgain)antennaattheRemoteradiolocations,ifpossible
 Verifythateachnetworkoperatingincloseproximitytoeach
otherhasBEENASSIGNEDTO
ADIFFERENTCHANNEL
 Installnetworksinruralareas(ifatallpossible)wheretheywilllikelyencounterlessman‐
madenoisethaninurbanorsuburbanareas
 Enableencryption
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Improving Signal Quality
Ifyouneedtoimprovearadio’ssignalquality,trythefollowingsteps:
 Adjustthedirectionofthehigh‐gainantennas.
 Increasetheheightoftheantenna’splacement.
 Usehigher‐gainantennasorexternalpreamplifiers.
 Selectanewlocationfortheradioand/oritsantenna.
 Decrease
thelengthoftheantennacable.
 Determineandresolvesourcesofinterferingelectricalnoise.
 Addarepeaterbetweenradiosthatarenotcommunicating.
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