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 | |
---|---|---|
01.00.00 | Siemens Industry Online Support | |
23.11.2018 | First released version | |
01.00.03 | Simatic Systems Support | |
05.11.2019 | Regions, comments and constants are added | |
03.00.00 | Simatic Systems Support | |
23.04.2020 | Set version to V3.0.0, harmonize the version of the whole library | |
03.00.01 | Simatic Systems Support | |
06.04.2021 | Insert documentation |