====== Linear interpolation ======

{{:en:mervis-ide:35-help:b83.png}}

===== Block name =====

B83_LINEARINTERPOLATION

===== ST call =====

<code st-iec>
PROGRAM TEST B83
   VAR
     FB : LIB.CORE.V1_0.B83_LINEARINTERPOLATION;
 END_VAR
 FB(IN:=REAL1, XVALUES:=POLE,YVALUES:=POLE2,ENABLEVALUES:=POLE3,RECALCULATESLOPES:=BOOL1,
        ENABLEMIN:=TRUE,ENABLEMAX:=TRUE,XMIN:=0,XMAX:=50,OUT=>REAL2);
END_PROGRAM
</code>

===== Library =====

LIB\CORE

===== Version =====

V1.0

===== Description =====

The block converts the input signal to the output using interpolation curve consisting of 10 segments.

===== Inputs =====

|Input            |Type                |Description                                                              |Default value    |
|IN               |REAL                |Input signal                                                             |0                |
|XVALUES          |ARRAY[1..10] OF REAL|Array of X coordinates 1-10                                              |[0,0,...,0]      |
|YVALUES          |ARRAY[1..10] OF REAL|Array of Y coordinates 1-10                                              |[0,0,...,0]      |
|ENABLEVALUES     |ARRAY[1..10] OF BOOL|Array of enable values                                                   |[False,...,False]|
|ENABLEMIN        |BOOL                |Enable of low alarm                                                      |False            |
|ENABLEMAX        |BOOL                |Enable of high alarm                                                     |False            |
|XMIN             |REAL                |Low alarm limit                                                          |0                |
|XMAX             |REAL                |High alarm limit                                                         |0                |
|RECALCULATESLOPES|BOOL                |Rising edge recalculates the block with new XValues/YValues/EnableValues.|False            |

===== Outputs =====

|Output  |Type|Description |
|OUT     |REAL|Output value|
|MINALARM|BOOL|Low alarm   |
|MAXALARM|BOOL|High alarm  |

===== Function =====

The block calculates a transfer function defined by up to 10 points //[X1,Y1]// ... //[X10,Y10]//, which are linked by lines. The Enable values activate the corresponding (X, Y) point.\\


===== Application example =====

{{:en:mervis-ide:35-help:b83_example.png}}