Transaction Groups: Source Value vs Latched Value

Ignition
1

Hello,

I recently upgraded to Ignition 8 and noticed the Transaction Group Items boxes now have two columns for Value: Source and Latched. I can’t find anything in the documentation that describes the difference between the two. Can someone please elaborate on the difference and also what the benefit is of seeing both? I’m currently seeing discrepancies between the two so it’s confusing which value will be used when it’s triggered.

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Thanks -

1 Like
2

Source Value is your Actual Value of the Tag.
Latch Value is what you are writing to the database.
Value first comes to Source and then goes to latch and goes to database.

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3

Can I do anything with the source value before it gets to latched value?

4

Use an expression item instead of a tag or OPC item.