How do I stop an inserter controlled by circuit network from insterting construction robots

[Roaders]

Hi All

I have a logic circuit that decides how many items to remove from a train. I have say 10 repair packs, 20 power poles and 30 construction robots ro remove.

The construction robots are handled by a different insterter and go straight into a roboport. How do I remove the construction robots from the list of items that is sent to the other inserter that unloads into a provider crate?

Thanks

[Nosferatu]

Constant Combinator: Signal Construction robots -99999

[Roaders]

Yeah I guess. Simple as that as I suppose. Thanks