The function calculates the linear mean value acyclically.
The simplest form of smoothing a sequence of measured values is to calculate the linear mean value by three points.
The function reads an array that is smoothed. N-2 smoothed measured values can be calculated from N measured values. Therefore, the output array in the index (0) and index (N) contains the value 0.
| LGF_SimpleSmoothingFC (FC) | ||||||||
|---|---|---|---|---|---|---|---|---|
| Ret_Val | Void | |||||||
| error | Bool | |||||||
| status | Word | |||||||
| Array[*] of LReal | values | Array[*] of LReal | ||||||
| Array[*] of LReal | smoothedValues | Array[*] of LReal | ||||||
| Identifier | Data type | Description |
|---|---|---|
| Ret_Val | Void | Void - Function has no return value |
| error | Bool | FALSE: No error TRUE: An error occurred during the execution of the FB |
| status | Word | 16#0000-16#7FFF: Status of the FB 16#8000-16#FFFF: Error identification (see following Table) |
| Identifier | Data type | Description |
|---|---|---|
| values | Array[*] of LReal | Values that are to be included in the smoothing. |
| smoothedValues | Array[*] of LReal | The smoothed values. |
| Code / Value | Identifier / Description |
|---|---|
| 16#0000 | STATUS_FINISHED_NO_ERROR Status: Execution finished without errors |
| 16#8400 | ERR_NOT_ENOUGH_VALUES Error: Not enough values. The block requires three (3) values to calculate a smoothed value. Increase the size of the array at the input parameter `values`. Adapt the array on the output parameter `smoothedValues` to the new size. |
| 16#8401 | ERR_ARRAY_DIFFERENT Error: The Arraysizes are not equal. The arrays `values` and `smoothedValues` must have the same size. |
The function calculates the smoothed values using the following formula:
\overline{y(n)} = \frac{y(n-1) + y(n) + y(n+1)}{3}The calculated value is output or the calculated values are output at output smoothedValue.
Based on this formula, the function cannot calculate values for the elements 0 and N.
| Version & Date | Change description | |
|---|---|---|
| 1.0.0 | Siemens Industry Online Support | |
| 23.11.2018 | First released version | |
| 1.0.1 | Simatic Systems Support | |
| 15.11.2019 | Regions, comments and constants are added | |
| 3.0.0 | Simatic Systems Support | |
| 23.04.2020 | Set version to V3.0.0, harmonize the version of the whole library | |
| 3.0.1 | Simatic Systems Support | |
| 06.04.2021 | Insert documentation | |