---
title: "system.opchda.replace"
description: "Replaces values on the OPC-HDA server if the given item ID exists."
---

# system.opchda.replace

> Replaces values on the OPC-HDA server if the given item ID exists.

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

## Description
## Client Permission Restrictions
[Permission Type](../../../ignition-modules/vision/vision-project-properties/vision-project-properties.md#vision-permissions-properties): OPC Server Management

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.opchda.replace(serverName, itemId, value, date, quality)`

### Parameters
Type | Parameter | Description 
------- | ------- | ------
String| `serverName` | The name of the defined OPC-HDA server.
String| `itemId` | The item ID to perform the operation on.
Object| `value` | The value to replace.
Object| `date` | The date to replace.
Integer| `quality` | The quality to replace.

### Returns
**Integer** - The items quality resulting from the operation.
### Scope
Gateway, Vision Client, Perspective Session