system.opchda.readRaw

This function is used in Python Scripting.

Description

Reads raw values from the OPC-HDA server.

Client Permission Restrictions

This scripting function has no Client Permission restrictions.

Syntax

system.opchda.readRaw(serverName, itemIds, startDate, endDate, maxValues, boundingValues)

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.
Integer	maxValues	The maximum number of values to return. 0 or less means unlimited.
Boolean	boundingValues	A boolean indicating whether or not the "bounding values" should be included in the result set. The bounding values provide a value exactly at the start and end dates, but may be resource-intensive to retrieve.

Returns

List[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

Gateway, Vision Client, Perspective Session

Code Examples

Example #1

# This example will read raw data from a Matrikon server between two specified dates.
# Declare start and end dates
start = system.date.getDate(2022, 3, 14)
end = system.date.now()
 
# Call system function and print results
readValue = system.opchda.readRaw("Matrikon",[1],start,end,0,False)
print readValue

Keywords

system opchda readRaw, opchda.readRaw