The function checks whether a value is within a defined value range.
The value range is defined with a set point, as well as a tolerance range, around the set point in percent (%). The function calculates the low limit and high limit of the value range.
| LGF_IsValueInTolerance (FC) | ||||||||
|---|---|---|---|---|---|---|---|---|
| LReal | value | Ret_Val | Bool | |||||
| LReal | setpoint | overHighLimit | Bool | |||||
| LReal | tolerance | belowLowLimit | Bool | |||||
| error | Bool | |||||||
| status | Word | |||||||
| Identifier | Data type | Description |
|---|---|---|
| value | LReal | Value to be checked to determine whether it is within the defined value range |
| setpoint | LReal | Set point |
| tolerance | LReal | Tolerance range around the set point in percent (%) |
| Identifier | Data type | Description |
|---|---|---|
| Ret_Val | Bool | Return: TRUE if the “value” is in the value range (range of the set point) |
| overHighLimit | Bool | TRUE if the “value” is greater than the upper limit value |
| belowLowLimit | Bool | TRUE, if the “value” is less than the lower limit 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#0000 | STATUS_NO_ERROR Status: no error occurred |
| 16#8401 | ERR_RANGE_LIMIT_VALUES Error: wrong values during limit calculation for limit values |
The setpoint and tolerance percentage variables define a value range.
The function checks whether the value is below, in or above the value range. The outputs belowLowLimit, Ret_Val, or overHighLimit show where the value is located.
Figure: Principle of operation
| Version & Date | Change description | |
|---|---|---|
| 1.0.0 | Siemens Industry Support | |
| 10.12.2019 | First released version Copied from "IsValueInRange" | |
| 3.0.0 | Simatic Systems Support | |
| 23.04.2020 | Set version to V3.0.0, harmonize the version of the whole library | |
| 3.0.2 | Simatic Systems Support | |
| 12.11.2020 | Bug fix - negative setpoint verification Insert documentation | |