View source for Migrating QuickOPC applications from OPC Classic to OPC UA

[[Category:Migration]] [[Category:OPC Classic]] [[Category:OPC DA]] [[Category:OPC XML-DA]] [[Category:OPC UA]]
QuickOPC attempts to use similar concepts between different OPC technologies wherever possible. In most cases, the overall structure and logic of your application will remain the same, but the code will use different objects and methods.

= Recommended Reading =
* [https://opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Latest/User%27s%20Guide%20and%20Reference-OPC%20Studio/webframe.html#Identifying%20Information%20in%20OPC%20UA%20Client-Server.html Identifying Information in OPC UA Client-Server]
* [https://opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Latest/User%27s%20Guide%20and%20Reference-OPC%20Studio/webframe.html#OPC%20UA%20Client-Server%20Security.html OPC UA Client-Server Security]
* [https://opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Latest/User%27s%20Guide%20and%20Reference-OPC%20Studio/webframe.html#Imperative%20Programming%20Model%20for%20OPC%20Data%20(Classic%20and%20UA).html Imperative Programming Model for OPC Data (Classic and UA)]

= OPC Data =
{| class="wikitable"
|-
! OPC Classic and XML-DA !! OPC UA
|-
| colspan="2" style="font-weight:bold;color:blue" | - Classes -
|-
| EasyDAClient || EasyUAClient
|-
| EasyDAItemChangedEventArgs || EasyUADataChangeNotificationEventArgs
|-
| DAItemDescriptor || UANodeDescriptor
|-
| DANodeElement || UANodeElement
|-
| DAQuality || UAStatusCode
|-
| DAVtq || UAAttributeData
|-
| DAVtqResult || UAAttributeDataResult
|-
| ServerDescriptor || UAEndpointDescriptor
|-
| colspan="2" style="font-weight:bold;color:blue" | - Interfaces -
|-
| IEasyDAClient || IEasyUAClient
|-
| colspan="2" style="font-weight:bold;color:blue" | - IEasyDAClient properties -
|-
| PullItemChangedQueueCapacity || IEasyUAClient.PullDataChangeNotificationQueueCapacity
|-
| SupportedTechnologies || ---
|-
| colspan="2" style="font-weight:bold;color:blue" | - IEasyDAClient methods -
|-
| GetItemSubscriptionArguments || IEasyUAClient.GetMonitoredItemArguments
|-
| IsKnownItemSubscriptionHandle || IEasyUAClient.IsKnownMonitoredItemSubscriptionHandle
|-
| ReadMultipleItems || IEasyUAClient.ReadMultiple
|-
| GetMultiplePropertyValues || IEasyUAClient.ReadMultiple
|-
| WriteMultipleItems || IEasyUAClient.WriteMultiple
|-
| WriteMultipleItemValues || IEasyUAClientExtension.WriteMultipleValues
|-
| BrowseServers || IEasyUAClient.Discover
|-
| BrowseNodes || IEasyUAClientExtension.Browse
|-
| BrowseAccessPaths || ---
|-
| BrowseProperties || IEasyUAClientExtension.BrowseProperties
|-
| SubscribeMultipleItems || IEasyUAClientExtension.SubscribeMultipleDataChanges
|-
| ChangeMultipleItemSubscriptions || IEasyUAClientExtension.ChangeMultipleDataChangeSubscriptions
|-
| UnsubscribeMultipleItems || IEasyUAClient.UnsubscribeMultipleMonitoredItems
|-
| UnsubscribeAllItems || IEasyUAClient.UnsubscribeAllMonitoredItems
|-
| PullMultipleItemChanges || IEasyUAClient.PullMultipleDataChangeNotifications
|-
| colspan="2" style="font-weight:bold;color:blue" | - IEasyDAClient events -
|-
| EventingFailure || IEasyUAClient.EventingFailure
|-
| ItemChanged || IEasyUAClient.DataChangeNotification
|-
| colspan="2" style="font-weight:bold;color:blue" | - IEasyDAClient extension methods (level 1) -
|-
| ReadItem || IEasyUAClientExtension.Read
|-
| ReadItemValue || IEasyUAClientExtension.ReadValue
|-
| ReadMultipleItemValues || IEasyUAClientExtension.ReadMultipleValues
|-
| GetPropertyValue || IEasyUAClientExtension.ReadValue
|-
| WriteItem || IEasyUAClientExtension.Write
|-
| WriteItemValue || IEasyUAClientExtension.WriteValue
|-
| BrowseBranches || IEasyUAClientExtension.Browse
|-
| BrowseLeaves || IEasyUAClientExtension.BrowseVariables
|-
| SubscribeItem || IEasyUAClientExtension.SubscribeDataChange
|-
| ChangeItemSubscription || IEasyUAClientExtension.ChangeDataChangeSubscription
|-
| UnsubscribeItem || IEasyUAClientExtension.UnsubscribeMonitoredItem
|-
| colspan="2" style="font-weight:bold;color:blue" | - IEasyDAClient extension methods (level 2) -
|-
| (tbd) || (tbd)
|}

= OPC Alarms&Events =
(tbd)