The function calculates the linear mean value cyclically.
The simplest form of smoothing a sequence of measured values is to calculate the linear mean value by three points.
The function reads-in a value with each positive edge on the insert input. As soon as three values have been read in, the block calculates a smoothed value and outputs it.
| LGF_SimpleSmoothingFB (FB) | ||||||||
|---|---|---|---|---|---|---|---|---|
| Bool | enable | smoothedValue | LReal | |||||
| Bool | insert | error | Bool | |||||
| LReal | value | status | Word | |||||
| Identifier | Data type | Default value | Description |
|---|---|---|---|
| enable | Bool | FALSE | Activates the block. As long as enable is `TRUE`, the block can accept values on the parameter `value`. |
| insert | Bool | FALSE | Accepts the value at the input `value` at positive edge and outputs a `smoothedValue` if three values have been read in. |
| value | LReal | 0.0 | Value that is to be included in the smoothing. |
| Identifier | Data type | Description |
|---|---|---|
| smoothedValue | LReal | The smoothed 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) |
| Code / Value | Identifier / Description |
|---|---|
| 16#7000 | STATUS_NO_CALL Status: No call of FB. The block waits for activation through the parameter `enable`. |
| 16#7001 | STATUS_FIRST_CALL Status: First call of FB after enabling |
| 16#7002 | STATUS_SUBSEQUENT_CALL Status: Processing is active. Subsequent call of FB. |
| 16#7010 | STATUS_NOT_ENOUGH_VALUES Status: Not enough values. The block requires three (3) values to calculate a smoothed value. Transfer additional values with a positive edge on the `insert` input. |
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 | |
| 1.0.3 | Simatic Systems Support | |
| 05.11.2019 | 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 | |