---
title: "system.tag.writeAsync"
description: "Asynchronously writes values to tags at specified paths."
---

# system.tag.writeAsync

> Asynchronously writes values to tags at specified paths.

This function is used in **Python Scripting**.

## Description
Asynchronously writes values to tags at specified paths. The script will not wait for the write operation to complete before moving on, but you can provide a callback function to run further code after the write has finished.

For a blocking tag write operation, see [system.tag.writeBlocking](appendix\scripting-functions\system-tag\system-tag-writeBlocking.md).

## Client Permission Restrictions
[Permission Type](../../../ignition-modules/vision/vision-project-properties/vision-project-properties.md#vision-permissions-properties): Tag Editing

Client access to this scripting function is blocked to users that do not meet the role/zone requirements for the above permission type. This function is unaffected when run in the Gateway scope.

## Syntax
`system.tag.writeAsync(tagPaths, values, [callback])`

### Parameters
Type | Parameter | Description 
------- | ------- | ------
List| `tagPaths` | A List of tag paths to write to. A tag property can be included in the path. If no property is specified in a tag path, the Value property is assumed.
List| `values` | The values to write to the specified paths.
Callable| `callback` | A function that will be invoked after the write operation is complete. The function must take a single argument: a List of [QualityCode](appendix\reference-pages\scripting-object-reference\scripting-object-reference.md#qualitycode) objects corresponding to the results of the write operation. [optional]
	
### Returns
Nothing
	
### Scope
Gateway, Vision Client, Perspective Session

## Code Examples
```python title="Example #1 - Write to Multiple Tags"
paths = ["[default]Tag1", "[default]Folder/Tag2"]
values = [10, 10]
system.tag.writeAsync(paths, values)
```

```python title="Example #2 - Using a Callback Function"
paths = ["[default]Tag1", "[default]Folder/Tag2"]
values = [10, 10]
 
def myCallback(asyncReturn):
    for result in asyncReturn:
        # Do something if a bad qualified value was returned
        if not result.good:
            print result
 
system.tag.writeAsync(paths, values, myCallback)
```