> For the complete documentation index, see [llms.txt](https://support.powerio.com/hub/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://support.powerio.com/hub/codesys-hvac/en/hvac-library/functionblocks/binary/triggen.md).

# TrigGen

## `TrigGen` (FB)

FUNCTION\_BLOCK TrigGen

### Short description

> Pulse generation with adjustable time interval.

### Representation

<figure><img src="/files/26d617faa559b3f334ffdb1383adaccb2188064c" alt=""><figcaption></figcaption></figure>

### Interfaces

#### Inputs

| Name        | Data type | Value range | Initial value | Function                     |
| ----------- | --------- | ----------- | ------------- | ---------------------------- |
| *xEn*       | BOOL      |             |               | Enable input                 |
| *wInterval* | WORD      |             |               | Time value for time interval |
| *eTimeBase* | eTimeMS   |             |               | Time base for time interval  |
| *xEnImp*    | BOOL      |             |               | Option enable 1st pulse      |

#### Outputs

| Name       | Data type | Value range | Initial value | Function                        |
| ---------- | --------- | ----------- | ------------- | ------------------------------- |
| *xTrig*    | BOOL      |             |               | Pulse output                    |
| *tNextImp* | TIME      |             |               | Remaining time until next pulse |

### Functional description

#### General

At the pulse output *xTrig* pulses with a duration of one program cycle and a time interval of (*wInterval* multiplied by *eTimeBase*) are generated cyclically if the enable input *xEn* is active.

> **Limitation of the maximum time interval**
>
> The time interval is limited to a maximum of 48 days to avoid an internal value overflow.
>
> **Example for calculating the time interval**
>
> *wIntervall* = 1000, *eTimeBase* = Millisecond, pulses are generated at a time interval of 1000 ms.

#### Enable 1st pulse *xEnImp*

With the option active (*xEnImp* = TRUE) the 1st pulse is generated immediately after the enable *xEn* is activated.\
With the option not active (*xEnImp* = FALSE) the 1st pulse is generated after the enable *xEn* after the time interval has elapsed.

<figure><img src="/files/2cb59301111fce4d9e311b8a72ef79ca60625103" alt=""><figcaption></figcaption></figure>

#### Remaining time until next pulse *tNextImp*

This output shows the remaining time until the next pulse if the enable input (\*xEn = TRUE) is active.\
In all other situations the constant 0.0 is shown.

<figure><img src="/files/cb512fb5e7fee1a5931626df4ebef8f5afd51f8a" alt=""><figcaption></figcaption></figure>

### Codesys

InOut:

| Scope  | Name        | Type    |
| ------ | ----------- | ------- |
| Input  | `xEn`       | `BOOL`  |
| Input  | `wInterval` | `WORD`  |
| Input  | `eTimeBase` | eTimeMS |
| Input  | `xEnImp`    | `BOOL`  |
| Output | `xTrig`     | `BOOL`  |
| Output | `tNextImp`  | `TIME`  |


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