Hi Felix
You can use Seeq's formula tool to do this. In this case I have 3 string signals (Compressor Stage for Areas A, B and C). I want to know when Area A and B are both off at the same time Area C is in Stage 1. Instead of doing the Value Search in the tool, I do it in formula. If you don't know how to do the value search in formula you can always do it in the tool and then click the 'i' by it in the details pane to get to Item Properties where you can see the formula used.
Once I do my three value searches
$condition1= $cs.ismatch('Off')
$condition2 = $cs2.ismatch('Off')
$condition3= $cs3.ismatch('Stage 1')
I then do a composite condition. In this case I want to know when all three are true so I use intersection but you can always search for combining conditions to get more options.
$condition1.intersect($condition2).intersect($condition3)
The whole formula is below:
$condition1= $cs.ismatch('Off')
$condition2 = $cs2.ismatch('Off')
$condition3= $cs3.ismatch('Stage 1')
$condition1.intersect($condition2).intersect($condition3)
This this tells me when Area A and B are both off at the same time area C is running in stage 1.