This function generates a random value with each call.
The random number has the data type Real in the range from 0.0 to 1.0.
LGF_Random_Real (FC) | ||||||||
---|---|---|---|---|---|---|---|---|
Ret_Val | Real | |||||||
error | Bool | |||||||
status | Word | |||||||
subfunctionStatus | Word | |||||||
Identifier | Data type | Description |
---|---|---|
Ret_Val | Real | Random Real number between 0.0 and 1.0 |
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) |
subfunctionStatus | Word | Status or return value of called FB's, FC's and system blocks |
Code / Value | Identifier / Description |
---|---|
16#0000 | STATUS_FINISHED_NO_ERROR Execution finished without errors |
16#8600 | ERR_RD_SYS_T Error in `RD_SYS_T` command - check `subFunctionStatus` code |
subFunctionStatus
. In this case, the output value in status
indicates which command caused the error. In this case, refer to the TIA Portal Online Help section for information on the respective commands.The function generates random values in the range:
0.0 ≤ ReturnVal ≤ 1.0.
The random value is formed from the nanoseconds of the current system time of the CPU. The byte order of this value is inverted and then converted to a floating point.
Version & Date | Change description | |
---|---|---|
01.00.00 | Siemens Industry Online Support | |
27.01.2017 | First released version | |
01.00.01 | Siemens Industry Online Support | |
17.08.2018 | Upgrade: TIA V15 Update 2 | |
01.00.02 | Siemens Industry Online Support | |
23.11.2018 | Upgrade: TIA V15.1 | |
01.01.00 | Simatic Systems Support | |
13.11.2019 | Renamed from "LGF_RandomBasic" to "LGF_Random_Real" 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 | |
04.02.2021 | Insert documentation |