Input real isolation

[teji]

Hello. This board is exactly what i need... but....
is there a way to really isolate optocoupers input ? 
if same as (very good) 868-a16, the input are powered by same power supply as all the board.
then if someone put voltage (not contact) at input, it will burn all board.
is it possible to cut/separate/disconnect 12V and GND for optocoupers input ? (then use external power supply for this) ?
on a16, no jumper for this, but all 12V on opto in are on a single track. than you can Cut to isolate (and use own gnd)
is it also possible on 868-ai ? it depend of the routing (one track or different tracks, ...)
thanks for you help and you fantastics cards.

[admin]

all ground have connected together. it's not easy to cut line.
here is schematic of KC868-AI:
https://www.kincony.com/download/KC868-AI-schematic.pdf

[teji]

all ground have connected together. it's not easy to cut line.
here is schematic of KC868-AI:
https://www.kincony.com/download/KC868-AI-schematic.pdf

Thank you for you fast answer.
maybe a good idea for next release : possibility to totaly isolate opto led from the pcb, via solder pad. 
for industrial use, it's more secure. 
your boards are amazing. i really love it ! congrats.

[admin]

thanks for suggestion.