Opc data Access Automation Specification

4.6.3.7

 

IsActive  

 Description 

 (Read/Write)  State of the Data Acquisition for this item.  

Syntax 

 IsActive As Boolean 

Remarks 

FALSE  if the item is not currently active, TRUE if the item is currently active 

Example 

Dim AnOPCItem as OPCItem 

Set OPCItem = GetOPCItem(SomeItemServerHandle) 

VB Syntax Example (getting the property): 

Dim CurrentValue As Boolean 

Dim SomeValue As Boolean 

CurrentValue = AnOPCItem.IsActive 

VB Syntax Example (setting the property): 

AnOPCItem.IsActive = SomeValue 

4.6.3.8

 

RequestedDataType  

Description  

(Read/Write) The data type in which  the item's value will be returned. Note that if the requested 

data type was rejected the OPCItem will be invalid(failed), until the RequestedDataType is set to 

a valid value. 

Syntax 

 RequestedDataType As Integer 

See Also 

Appendix A - OPC Automation Error Handling 

Appendix D- Notes On Automation Data Types 

Example 

Dim AnOPCItem as OPCItem 

Set OPCItem = GetOPCItem(SomeItemServerHandle) 

VB Syntax Example (getting the property): 

Dim CurrentValue As Integer 

Dim SomeValue As Integer 

CurrentValue = AnOPCItem.RequestedDataType 

VB Syntax Example (setting the property): 

74 

 

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OPC Data Access Automation Specification2.02 

AnOPCItem.RequestedDataType = SomeValue