Opc data Access Automation Specification

4.4.4.11

 

UpdateRate  

Description 

(Read/Write) The fastest rate at which data change events may be fired. A slow process might 

cause data changes to fire at less than this rate, but they will never exceed this rate. Rate is in 

milliseconds. This property’s default depends on the value set in the OPCGroups Collection. 

Assigning a value to this property is a “request” for a new update rate. The server may not support 

that rate, so reading the property may result in a different rate (the server will use the closest rate it 

does support). 

Syntax UpdateRate 

As 

Long 

Example 

VB Syntax Example (getting the property): 

Dim CurrentValue As Long 

Set MyGroups = AnOPCServer.OPCGroups 

Set OneGroup = MyGroups.ConnectPublicGroup ( “AnOPCGroupName” ) 

‘   some more code here 

DefaultGroupUpdateRate = OneGroup.UpdateRate 

VB Syntax Example (setting the property): 

Set MyGroups = AnOPCServer.OPCGroups 

Set OneGroup = MyGroups.ConnectPublicGroup ( “AnOPCGroupName” ) 

‘   some more code here 

OneGroup.UpdateRate = 50