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