I have some gate operators which are currently installed which only have connections for 1 set of photo cells on the board, naturally I can add a second set in series but this will mean the gates will stop when the external set of cells is broken, does any body do a bit bit of wizardry that I can add in to make the boards act like a 2 independant photo cell board as there are 6 of these in place.

Regards
Andy

Unfortunatly if you only have 1 photocell circuit on the control board, the only way to add a second set is to connect them in series as you suggested. The only way around this is to replace the control panel.