Factorio Forums

I'm not sure what happened between 1.1 and 2.0 that I just can't wrap my head around, but I can't seem to get my stations to work anymore. Here's what I'm looking for:

Depot: ok, this is working fine for me.
Wiring standard: Red wire is handling my inventory management (storage chests), green wire is handling my filters.
Filtering: I want to use filter inserters for both provider and requester stations. I don't want the risk of something going sideways because of a dirty train.
Additional mods: It's a Bob's and Angels run, so I'm using warehouses for my stations. I'm also using LTN Combinator Modernized.

What I'm seeing: Trains will pull into the requester station, start emptying, then the filter value will clear out.

I'm happy to answer questions and provide screenshots. And I'm not looking to get blueprints, I'd like somebody to talk me through the process of getting the stations set up.

Thanks in advance!

The lamp is the input of the LTN station.
It handles which items and how many are available at the station for pickup (as a provider) or how many it wants to recieve from another station (as a requester)
Negative values represent requested amount, positive values represent available amount.
A stations can be provider and requester for different items at the same time, but not a requester and provider for the same item at the same time (though it can be for different points in time).

You also send some extra control signals to the lamp to set the configuration of the station.
See the LTN manual topic (viewtopic.php?t=51072) for which signas do which, or use something like LTN combinator to set them in a GUI and just hook that up. (https://mods.factorio.com/mod/LTN_Combinator_Modernized).

The yellow constant combinator is the LTN output, it contais some signals that describe the composion of the actual train (how many locomotives/cariages and in which place they all are) and what is supposed to be in the train after (un)loading is done, in other words, the goal.

If you want to read the actual contents of the train, you use the station itself and set the "read train contents" option to active.

So what you have to do to get the correct filter signals, is create a decider combinator, connect its inputs to the combinator and the train station.
Im Assuming you connect green to station and red to the constant combinator.
Use a "(green) each greater than (red) each, output each", to get which items need to be removed from the train.
Or "(green) each smaller than (red) each, output each", to get which items still need to be loaded on the train.

If you want to be fancy with precision loading exact amounts, feed one or the other into an "each * -1 output each" arithmatic combinator to subtract what is in the train from what should be there for the exact amounts you still need to load, or subtract what is required from what is actually in the train to get how much still needs to be unloaded.