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 | |
---|---|---|
01.00.00 | Siemens Industry Support | |
10.12.2019 | First released version Copied from "IsValueInRange" | |
03.00.00 | Simatic Systems Support | |
23.04.2020 | Set version to V3.0.0, harmonize the version of the whole library | |
03.00.02 | Simatic Systems Support | |
12.11.2020 | Bug fix - negative setpoint verification Insert documentation |