> 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/time/xpulser.md).

# XPulseR

## `XPulseR` (FB)

FUNCTION\_BLOCK XPulseR

### Short description

> Generation of a single pulse with adjustable duration and reset capability.

### Representation

<figure><img src="/files/832b8857f9787ccc4a26552997fcaf0f6de11070" alt=""><figcaption></figcaption></figure>

### Interfaces

#### Inputs

| Name     | Data type | Value range | Initial value | Function                          |
| -------- | --------- | ----------- | ------------- | --------------------------------- |
| *xIN*    | BOOL      |             |               | Binary input (FALSE > TRUE)       |
| *tPT*    | TIME      |             | T#1s          | Duration of the output pulse in s |
| *xReset* | BOOL      |             |               | Binary reset input (FALSE > TRUE) |

#### Outputs

| Name  | Data type | Value range | Initial value | Function                                   |
| ----- | --------- | ----------- | ------------- | ------------------------------------------ |
| *xQ*  | BOOL      |             |               | Pulse output (FALSE = Off, TRUE = On)      |
| *tET* | TIME      | 0 … *tPT*   |               | Current duration of the pulse at *xQ* in s |

#### Setpoints / parameters

| Name      | Data type | Value range | Initial value | Function                         |
| --------- | --------- | ----------- | ------------- | -------------------------------- |
| **xTest** | BOOL      |             | FALSE         | Binary test input (FALSE > TRUE) |

### Function description

#### General

At the pulse output *xQ* is after each rising edge (FALSE > TRUE) at the binary input *xIN* and/or at the setpoint / parameter **xTest** a pulse with a duration *tPT* generated (precondition: *xReset* = FALSE).\
\
Each rising edge (FALSE > TRUE) at the reset input *xReset* resets the pulse output *xQ* immediately (= FALSE).\
\
The edge detection (FALSE > TRUE) on the inputs *xIN* or **xTest** has a higher priority compared to the edge detection on the input *xReset* (FALSE > TRUE).\
This results in the fact that despite simultaneous edge detection a pulse with a duration *tPT* is generated at the output *xQ* .\
The setpoint / parameter **xTest** is cyclically deactivated (= FALSE).

<figure><img src="/files/84aeadf8446fd1fb64c9b0af0859d210f01678c4" alt=""><figcaption></figcaption></figure>

### CODESYS

InOut:

| Scope       | Name     | Type   | Initial    |
| ----------- | -------- | ------ | ---------- |
| Input       | `xIN`    | `BOOL` |            |
| Input       | `tPT`    | `TIME` | TIME#1s0ms |
| Input       | `xReset` | `BOOL` |            |
| Input Const | `xTest`  | `BOOL` | FALSE      |
| Output      | `xQ`     | `BOOL` |            |
| Output      | `tET`    | `TIME` |            |


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://support.powerio.com/hub/codesys-hvac/en/hvac-library/functionblocks/time/xpulser.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.