Easy Electronics xLogic Micro PLC - Backup of the Real-Time Clock; Retentivity; Parameter Protection; Calculating the Gain and Offset of Analog Values

101
Becauseofslighttolerancesinthecharacteristicsofelectroniccomponents,thesettimeTmaydeviate.The
xLogichasamaximumtoleranceof ± 0.02%.
When0.02%ofthetimeTissmallerthan0.02seconds,themaximumdeviationis0.02seconds.
Example: Themaximumtoleranceperhour(3600seconds)is ±0.02%,whichisproportionalto ± 0.72
seconds.Themaximumtoleranceperminute(60seconds)is ± 0.02seconds.
Accuracyofthetimer(weekly/yearlytimer)
Themaximumtiminginaccuracyis ± 5s/day.
6.4.3Backupofthereal-timeclock
Becausetheinternalreal-timeclockofanxLogicisbackedup,itcontinuesoperationafterapower
failure.Theambienttemperatureinfluencesthebackuptime.Atanambienttemperatureof25°C,the
typicalbackuptimeofxLogicis100hours.
6.4.4Retentivity
TheswitchingstatesandcountervaluesofSFscanbesetretentive.Thismeansthatcurrentdataisretained
afterapowerfailure,andthattheblockresumesoperationatthebreakpoint.Thetimerisnotreset,
butresumesoperationuntilthetime-to-gohasexpired,forexample,toenablethisresponse,however,
therelevantfunctionsmustbesetretentive.
R:Thedataisretained.
/:Currentdataisnotretained(default).Seethesectionintopic"Secondcircuitprogram
"onenablinganddisablingretentivity.
SFshourscounter,weeklytimer,yearlytimerandPIcontrollerarealwaysretentive.
6.4.5Parameterprotection
Intheparameterprotectionsettings,youcandeterminewhetherornottheparameterscanbedisplayed
andeditedinxLogicparameterassignmentmode.Twooptionsareavailable:
+:Theparameterattributepermitsread/writeaccessinparameterassignmentmode(default).
-:Theparametersettingsareread–/write–protectedinparameterassignmentmode,andcanbe
editedonlyinprogrammingmode.Seetheparameterprotectionmodeexampleinthe"Secondcircuit
program".
6.4.6Calculatingthegainandoffsetofanalogvalues
Asensorisconnectedtotheanaloginputandconvertsaprocessvariableintoanelectricalsignal.This
valueofsignallieswithinthetypicalrangeofthissensor.xLogicalwaysconvertstheelectricalsignalsat
theanaloginputintodigitalvaluesfrom0to1000.Avoltageof0to10V(orcurrentsignal0/4…20mA)