---
title: "system.opchda.isServerAvailable"
description: "Checks to see if the specified OPC-HDA server is defined, enabled, and connected."
---

# system.opchda.isServerAvailable

> Checks to see if the specified OPC-HDA server is defined, enabled, and connected.

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

## Description
## Client Permission Restrictions
This scripting function has no [Client Permission](projects\project-properties\project-properties.md#client---permissions) restrictions.

## Syntax
`system.opchda.isServerAvailable()`

### Parameters

|Type|Parameter|Description|
|--|--|--|
|String |`serverName`| The name of the OPC-HDA server to check.|
### Returns
**Boolean** - Will be true if the server is available and can be queried, false if not.
### Scope
All