Add an expression

To add an expression, open the Data panel and select Add Expression.

In this mode, the search results list displays suggestions for completing expressions, in addition to data matching your search term. Enter your expression by typing into the search bar. You can also select an item from the list of suggestions to insert it into your expression.

As you enter your expression into the search bar, Historian Client Web recognizes the use of functions, and offers you suggestions for completing the function by showing you the various options available to you as you type. Other suggestions can include functions, local tags, and data, depending on the context of your expression as you build it. The input field will expand as your expression gets longer so that you are able to view everything without having to scroll. However, you will only be able to add 10 tags to your expression. If you add more than 10 tags, you will get an error, and you will be unable to save your expression.

Note: You can select the function in the search results and view the online help for that particular function.

Once you have completed the expression, select Save expression. If the expression is valid, it is added to your content. The Save expression will appear greyed out until the expression is valid.

Note: You can only add up to five expressions per chart.

To return to standard search mode, close the data panel and then re-open it.