---
title: "system.bacnet.writeWithPriority"
description: "Write to the Present_Value attribute of an object with a custom priority level."
---

# system.bacnet.writeWithPriority

> Write to the Present_Value attribute of an object with a custom priority level.

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

## Description

:::note 
To use this function, the [BACnet](ignition-modules\opc-ua\opc-ua-drivers\bacnet\bacnet.md) driver must be installed.
:::
 

## Client Permission Restrictions

This scripting function has no [Client Permission](ignition-modules\vision\vision-project-properties\vision-project-properties.md#vision-permissions-properties) restrictions.

## Syntax

`system.bacnet.writeWithPriority(deviceName, objectType, objectId, value, priority)`

### Parameters
Type | Parameter | Description 
------- | ------- | ------- 
String  |`deviceName` | The name of the configured BACnet/IP device instance to write from.
Integer | `objectType` | The numeric id of the objectType of the object instance being written to. See the objectType Reference table below. 
Integer | `objectId` | The object instance number to write to.
Object  |`value` | The value to write. Clearing a value can be accomplished by writing a None value. 
Integer | `priority` | The priority level to write the value at. Must match a level in the standard BACnet priority array (a value from 1 to 16). See the Priority Reference table below. 

### Returns
Nothing

### Scope
Gateway, Perspective Session

### objectType Reference

|Object|ID|
|---|---|
|Analog Output|1|
|Analog Value|2|
|Binary Output|4|
|Binary Value|5|
|Device|8|
|Large Analog Value|46|
|Multi-State Output|14|
|Multi-State Value|19|

### Priority Reference

|Level|Application|
|---|---|
|1|Manual-Life Safety|
|2|Automatic-Life Safety|
|3|Available|
|4|Available|
|5|Critical Equipment Control|
|6|Minimum On/Off|
|7|Available|
|8|Manual Operator|
|9|Available|
|10|Available|
|11|Available|
|12|Available|
|13|Available|
|14|Available|
|15|Available|
|16|Available|

## Code Example

```python title="Example"
# Write a value of 'True' to Binary Value 1 with a Priority of 7.
 
deviceName = 'BACnet Remote'
objectType = 5 # Binary Value
objectId = 1
value = True
priority = 7
 
 
system.bacnet.writeWithPriority(deviceName, objectType, objectId, value, priority)
```