Unified Automation Forum

Posted: **19 Jan 2015, 11:20**

I am implementing the History Read functionality. I have created a node which has the history details. The history Data is read from the database. The history read works fine.

But the Node which I have created for should show the latest value in the Table. The Access level I had given was CurrentReadOrWrite which shows the latest value in the UA Expert. After implementing the History Read I had to change the Access level to HistoryRead or HistoryReadORWrite. Due to this I am not able to see the Latest Value (In UA Expert- Data access View)

How to get both access leveles ?

Posted: **19 Jan 2015, 14:48**

Instead of doing

Code: Select all

variable.AccessLevel = AccessLevels.CurrentReadOrWrite;

or

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variable.AccessLevel = AccessLevels.HistoryReadOrWrite;

do:

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variable.AccessLevel = (AccessLevels.CurrentReadOrWrite | AccessLevels.HistoryReadOrWrite);

or

Code: Select all

variable.AccessLevel = AccessLevels.CurrentReadOrWrite; 
variable.AccessLevel |= AccessLevels.HistoryReadOrWrite;

when you set the AccessLevel you want for the Node.

Posted: **30 Jan 2015, 07:11**

Thanks a lot. It worked

Unified Automation Forum

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History Read Node

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