Hi there to all on the forum,
I am a brand new member of your community (joined this morning) and are extremely interested and hopefully contributing to the OpenPLC effort.
I have a very strong background in hardware design, manufacturing, and maintenance.
I hope the forum is open to exchange of ideas to improve the product in the long run for all.
I am excited to see the 3D modeling and printing design work already done as a concept design.
I do however see one issue with the concept design as it stands now. In a "PLC" with say 8 cards plugged together, Murphy says that it shall be number card in slot number 4 or 5 that cause problems or needs to be replaced. That in itself is not a major issue, but I envisage a product that even a farmer in rural Africa can plug one card out and another one in... Is it not looking for trouble to ask unskilled labor to disassemble cards to get to a faulty unit??
I throw my 10c out there as I have started working on a design that shall have more of a Euro card-rack system design with cards plugging into a back plane...
The second question - Why not a 25pin Dtype in the front? That opens up more flexibility and options as you can go on the outside for solder, crimp and ribbon connector. In the developing world, you are more likely to find a 25 pin D type connector (Salvaged computer spares) than specific Phoenix connectors...
Let's hear viewpoints on theses issues