The built in coop function shouldn't be used with this sort. You click all the assemblers you want to participate in the coop, and then only setup the queue in the 1 assembler not marked as coop. Using sort with this operation is not advised.

In my experience, cooperative mode doesn't work with conveyors off.
I use these settings on all assemblers to maintain a minimum level of all resources:
[Ingot:P2:5,Iron:500,:Cobalt:75,Nickel:25,Silicon:25,Silver:25,Stone:25]
They may occasionally pull more than this over conveyors but it means they always have enough to build any requested item, so they don't waste time waiting on resources.

Ah i got it working now indeed. It works fine as long as you have the correct settings :)

Further experimentation has shown that only the assemblers with cooperation ticked need to have conveyors turned on. The master assembler can still have conveyors turned off.

as already mentioned in my not recognized thread would it be great if u could catch the Assembler request for Ingots and develope kinda (onDemand) state to have Assemblers fixed ;)

http://psteamcommunity.yuanyoumao.com/workshop/filedetails/discussion/321588701/620695877144837124/

:-)