FUNCTION_BLOCK CharCurve_LREAL
This function block will evaluate a piecewise linear function (the characteristic curve) at an integral point 
. The characteristic curve is specified by a defined number of integral sampling points 
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InOut:
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Scope
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Name
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Type
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Comment
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Input
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lrInputValue
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LREAL
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interpolation point 
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usiNoPoints
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USINT
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number  of sampling points defining the characteristic curve ( )
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Inout
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ap2lrPoints
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ARRAY [0..10] OF POINT2_LREAL
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array of  two dimensional sampling points  with 
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Output
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lrOutputValue
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LREAL
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interpolated value at point 
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xError
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BOOL
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error flag
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wErrorID
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WORD
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information on error
0: No error
1: error within array of sampling points (i.e. the sampling points aren't arranged in ascending order)
2: interpolation point diInputValue is outside of area covered by sampling points ( )
4: invalid number of sampling points
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