Easy Electronics xLogic Micro PLC - Page 102

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atinputAIistransformedinternallyintorangeofvaluesfrom0to1000.Aninputvoltageexceeding10
Visshownasinternalvalue1000.
Becauseyoucannotalwaysprocesstherangeofvaluesfrom0to1000aspredeterminedbyxLogic,you
canmultiplythedigitalvaluesbyagainfactorandthenshiftthezerooftherangeofvalues(offset).This
allowsyoutooutputananalogvaluetothexLogicdisplay,whichisproportionaltotheactualprocess
variable.
Parameter Minimum Maximum
Inputvoltage(inV) 0 ≥ 10
Inputcurrent(inmA) 0/4 ≥20
Internalvalue 0 1000
Gain –10.00 +10.00
Offset –10000 +10000
Mathematicalrule
Actualvalue Ax=
(internalvalueatinputAx∙gain)+offset
Gainandoffsetcalculation
Thegainandoffsetiscalculatedbasedontherelevanthigh
andlowvaluesofthefunction.
Example1:
Theavailablethermocoupleshavethefollowingtechnical
data: –30to+70℃,0to10VDC(i.e.0to1000inxLogic).
Actualvalue =(internalvalue ∙gain)+offset,thus
–30 =(0 ∙A)+B,i.e.offsetB=–30
+70 =(1000 ∙A) –30,i.e.gainA=0.1
Example2:
Apressuresensorconvertsapressureof1000mbarintoavoltageof0V,andapressureof5000mbarinto
avoltageof10V.
Actualvalue =(internalvalue.gain)+offset,thus
=(0·A)+B,i.e.offsetB=1000
=（1000 ∙A)+1000,i.e.gainA=4
Exampleofanalogvalues