You will probably have to use three tags to accomplish this.
Tag 1 is the one you have now.
Tag 2 will be a multi-write tag with a trigger being an expression that becomes true when you have a value you want to be historized.
Tag 3 will be a memory tag, an IO tag in Analog mode without an IO driver, which is written the value of Tag 1 by Tag 2.
Then configure a report to dump out the Tag 3 value.
Big unfortunate thing with this is that multi-writes write to the event log, so if you have a lot of these, it could get annoying and you may want to put them under their own Even DB tag.
You will probably have to use three tags to accomplish this.
Tag 1 is the one you have now.
Tag 2 will be a multi-write tag with a trigger being an expression that becomes true when you have a value you want to be historized.
Tag 3 will be a memory tag, an IO tag in Analog mode without an IO driver, which is written the value of Tag 1 by Tag 2.
Then configure a report to dump out the Tag 3 value.
Big unfortunate thing with this is that multi-writes write to the event log, so if you have a lot of these, it could get annoying and you may want to put them under their own Even DB tag.