Factorio Forums

I'm not understanding how these "filter" toggles in decider combinators work.
First, I would expect the output from these two images to be reversed. Why am I only getting an output if I uncheck the "red" filter?
And secondly, what does the second filter, next to the "4" in my example do? Toggling that in these photos doesn't appear to do anything in this situation.

You're not comparing your signal to the constant value 4, but to the signal "4 on black". When you uncheck the "R" box, because there is no green wire, both "green check" and "4 on black" have the same value, zero. When you don't only "4 on black" is zero.

You'll want to enter a constant value instead, at the bottom of the signal selection.

jdrexler75 wrote: Sun Nov 09, 2025 2:38 pm You're not comparing your signal to the constant value 4, but to the signal "4 on black". When you uncheck the "R" box, because there is no green wire, both "green check" and "4 on black" have the same value, zero. When you don't only "4 on black" is zero.

You'll want to enter a constant value instead, at the bottom of the signal selection.

Got it. Thank you!

I am surprised that this would make the output happen: "When you uncheck the "R" box, because there is no green wire, both "green check" and "4 on black" have the same value, zero." That seems counterintuitive to me, but now that I understand it, I'll work with it.