---
title: "system.opchda"
---

# system.opchda

> The following functions give you access to interact with the HDA types of OPC servers.

## OPC HDA Functions

For more information on OPC HDA, see the [OPC HDA properties](../../../ignition-modules/tag-historian/tag-history-providers/tag-history-providers.md#opc-hda-properties) section of the Tag History Providers page.

If you are looking for an OPC HDA server to use, various OPC HDA server tools are available, such as Matrikon and Kepware.

### Functions by Scope