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西门子 S7-300 PLC模拟量转换.pdf

发布：2025-05-02约8.13千字共7页下载文档
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S7-300/400TipAnalogScalingTipNo.1

SIMATIC

S7-300/400Tips

GroupTopic

1ScalingAnalogValues

Overview

AnalogInputsandOutputsinanS7PLCarerepresentedinthePLCasa16-bitinteger.Over

thenominalspanoftheanaloginputoroutput,thevalueofthisintegerwillrangebetween-

27648and+27648.However,itiseasiertousetheanalogvaluesiftheyarescaledtothe

sameunitsandrangesastheprocessbeingcontrolled.Thisapplicationstipdescribes

methodsforscalinganalogvaluestoandfromengineeringunits.

ProgramDescription

Theprogramforscalinganalogvaluesconsistsof2function(FC)blocks.Theseblocksare

optimizedforunipolar(0..27648)analogvalues,butwillalsoworkwithbipolaranalogs.Both

blocksareshownintwodifferentlanguages:LADandSTL.

FC100convertsanintegerinanominal0..27648rangetoafloatingpointnumberinthe

specifiedengineeringunits.

FC101convertsafloatingpointnumberinthespecifiedengineeringunitstoanintegerin

0..27648range.

Copyright1996bySIEMENSpage1/7Scaling.doc

Status:11/96Version1.0

SIMATICS7-300/400customershavefreeuseoftheapplicationtips.ThesetipsareonlyageneralapproachtousingtheS7-300/400withvarious

applications.Yourspecificapplicationmaybedifferent.ItisyourresponsibilitytousetheSIMATICS7-300/400properlyinyourapplications.

S7-300/400TipAnalogScalingTip

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