Thx for the reply, there are resistors on the leds and the opto, as they're preassembled with it.
They come in kit for the ones we use here.
This plan is just a drawing to know what is wired where. Not a production ready plan.
Thank you for the note on the opto's led on the diagram, I did correct this in our database for as-built purposes.
Many thanks! i did oversee that.
There's no cc between the screwterminal. screwterminals are linked to gpio I/O's or 5V/GND.
if it is between the 5V/GND it would have run out even the verry first rpi that worked fine for years.
And I think we can close the topic since there's no problem with the new batch of rpi with the hw.
Many thanks to everyone