Supported platforms: CODESYS 2.3, CODESYS 3.5
SCD_CurveScale FB scales ADC value to some calibrated unit (e.g. bar) with a specified calibration curve. The calibration curve is given to the FB with two arrays, both with ten indices. These arrays include the calibration curve points. The curve is linear between the two adjacent calibration curve points.
When the input value is outside the limits given with i_CalibrationCurvePointsIn[1] and i_CalibrationCurvePoints[i_FinalCalibrationPoint], FB limits o_ScaledValue output accordingly to i_CalibrationCurvePointOut[1] and i_CalibrationCurvePointOut[i_FinalCalibrationPoint]. In this case, o_InputOutOfRange output is true.
The FB uses SCD_LinearScale to scale the input value to the scaled value between the adjacent calibration curve points.
|
This function block is primarily intended for SensorCalibrationAndDiagnostic library's internal use. |
Input variable name |
Data type |
Range |
Description |
i_InputValue |
WORD |
0..65535 |
AD converter value to be scaled |
i_CalibrationCurvePointsIn |
ARRAY [1..10] OF WORD |
|
ADC values in array which corresponds to CalibrationCurvePointsOut array’s values. |
i_CalibrationCurvePointsOut |
ARRAY [1..10] OF INT |
|
Scaled values in array which corresponds to CalibrationCurvePointsIn array’s values. |
i_LastCalibrationPoint |
BYTE |
2..10 |
Index number for last calibration curve point used. Amount of used calibration points can be limited with this input |
Output variable name |
Data type |
Range |
Description |
o_ScaledValue |
INT |
-32768..32767 |
Scaled value. |
o_InputOutOfRange |
BOOL |
TRUE/FALSE |
Input value is out of range given in array. |
Source file Topic000254.htm
Last updated 24-Apr-2025
