Thanks for your question. The Convert external IPC to Centroid is greyed out because there was no IPC-356 imported.
(1) If you have an IPC 356 Netlist (generated from your PCB CAD), it may be imported directly into FAB 3000 and all PNP centroids will be generated; then export the PNP file (menu: File / Export / Centroid...) Please view the following blog post for Step-by-Step instructions:
(2) If your PCB CAD cannot generate an IPC-356 netlist, can it export an ODB++ file? If yes, then generate the ODB++ (from your PCB CAD), import the ODB++ into FAB 3000, and you can export the PNP file.
(3) If your PCB CAD cannot output anything other than Gerbers, Drill, DXF, etc -- than you can manually create the PNP file by using the Paste & Silk Gerber files. Here's a tutorial movie:
Basically the more information you can get from your PCB CAD tool, the less work is required to generate a PNP file.
Brand new to this product. I extracted a net list for my board. I need to create a PNP file ( Centroid ). Problem is that the option at Assembly>Convert external IPC netlist to Centroid is not on ( grey ). How do I solve this? Do I have to manually load the netlist somewhere?