I've used the FMD1616-10 with very good results. However, I'm about to meet some resistance to other uses since it only has sinking I/O. Do you have any plans to offer sourcing as an option or better yet use configurable sink or source circuits?
In industrial automation, sourcing outputs or often required for safety in that an output wire shorted to ground can not activate a dangerous output. It also keeps troubleshooting more understanble to maintenance personnel used to relay outputs.
I also need to interface to existing control systems that have sourcing I/O and must use external relays to invert the signals.
[Edit] So I think we will go with the F1616-BA. I would still like to see a version with solid state source/sink I/O.