---
title: "system.opchda.readProcessed"
description: "Reads processed values from the OPC-HDA server."
---

# system.opchda.readProcessed

> Reads processed values from the OPC-HDA server.

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

## Description
Reads processed values from the OPC-HDA server. Processed values are calculated values, based on the aggregate function requested for each item. The list of aggregates can be obtained by calling [system.opchda.getAggregates()](appendix\scripting-functions\system-opchda\system-opchda-getAggregates.md).

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

## Syntax
`system.opchda.readProcessed(serverName, itemIds, startDate, endDate, resampleIntervalMS, aggregates)`

### Parameters

|Type|Parameter|Description|
|--|--|--|
|String |`serverName`| The name of the defined OPC-HDA server to read.|
|List| `itemIds` | A list of item ids to read.|
|Object| `startDate` | The starting date/time of the query.|
|Object| `endDate` | The ending date/time of the query.|
|int |`resampleIntervalMS`| The interval, in milliseconds, that each value should cover.|
|List| `aggregates` | A list which should be one-toone with the item ids requested, specifying the integer id of the aggregation function to use. The aggregation ids are defined in the OPC-HDA specification. The list of aggregates can also be obtained by calling [system.opchda.getAggregates()](appendix\scripting-functions\system-opchda\system-opchda-getAggregates.md).|
### Returns
**ReadResults[]** - A list of read results which is one-to-one with the item IDs passed in. The ReadResult object has a `serviceResult` quality property that indicates whether the call was successful, and is itself a list of QualifiedValues.
### Scope
All