How to address existing tags within datasubscriber datachanged event

[scott.clark]

I created a data subscriber monitoring a tag in a plc.  When the tag changes states, within the datachanged event code, I  would like to make decisions based on other plc tags that are being used elsewhere in the application. 

Do I have to execute a plc read within the datachanged event?  Seems redundant if the plc tag is already being used in for instance a BasicIndicator, I should be able to get its latest value.

thanks

[Godra]

You should be able to collect all the values from current controls and make a decision.

Something of a similar logic you can see here:

https://www.advancedhmi.com/forum/index.php?topic=2129.msg12338#msg12338

the part that says: "Every 10 seconds the timer is collecting values currently displayed in the labels and writing them to the database."