This function generates a signal that changes between the values FALSE and TRUE depending on a defined frequency and a pulse pause ratio.
| LGF_Frequency (FB) | ||||||||
|---|---|---|---|---|---|---|---|---|
| Real | frequency | clock | Bool | |||||
| Real | pulsePauseRatio | countdown | Time | |||||
| Identifier | Data type | Default value | Description |
|---|---|---|---|
| frequency | Real | 0.0 | Clock frequency in Hz. |
| pulsePauseRatio | Real | 1.0 | Pulse pause ratio (standard: 1.0 corresponds to 1:1). |
| Identifier | Data type | Description |
|---|---|---|
| clock | Bool | Output changes with defined frequency. |
| countdown | Time | Remaining time of the current `clock` state. |
The clock output is a Boolean value that toggles at the desired frequency. The pulsePauseRatio input is used to set the pulse pause ratio.
The output countdown outputs the remaining time of the current state of clock.
If the desired frequency or pulse pause ratio is less than or equal to 0.0, the output clock = FALSE and countdown = 0s.
clock of the FB LGF_Frequency depends on the cycle time of the OB
Main. To increase the accuracy, the FB can also be called in a cyclic interrupt
OB with a low time interval.| Version & Date | Change description | |
|---|---|---|
| 1.0.0 | Siemens Industry Online Support | |
| 19.08.2015 | First released version | |
| 1.1.0 | Siemens Industry Online Support | |
| 25.05.2016 | New function: pulse pause ratio | |
| 1.1.1 | Siemens Industry Online Support | |
| 26.05.2016 | Add comments | |
| 1.1.2 | Siemens Industry Online Support | |
| 02.01.2017 | Upgrade: TIA Portal V14 Update 1 | |
| 1.1.3 | Siemens Industry Online Support | |
| 17.08.2018 | Upgrade: TIA V15 Update 2 | |
| 1.1.4 | Siemens Industry Online Support | |
| 23.11.2018 | Upgrade: TIA V15.1 | |
| 1.0.7 | Simatic Systems Support | |
| 20.09.2019 | Code refactoring, regions and more comments 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 | |
| 15.02.2021 | Insert documentation | |