Factorio Forums

Usually, when a filter inserter in a "set filters" mode receives a circuit signal, it performs the following:

1. Filter the signals for items-only
2. Filter the signals for positive value only
3. Sort the result by value
4. Take N signals with the highest values where N=5 for purple fast filter inserter and N=1 for white stack filter inserter

However, I've encountered that it's not always the case: Here, it receives "Mining Drill = 50", "Pump = 22", and a number of other signals. Instead of selecting Mining Drills (signal with the highest value) as the filter, it selects the pump which is 2nd highest.

I understand this might be a normal behaviour, but looks like a bug for me, especially since the "Circuit Network 377" on the right sorts signals from highest to lowest.

The value is irrelevant, it uses signals sorted by item ID.

Thanks for the report. Looking into it; step 3 simply is not a thing when it comes to how the inserter set-filter logic works. It simply iterates the signals that the network has and the first N it has it uses.

However every description in the game shows them sorted by count which is where the confusion comes from.