auto-closing turret ports

Turret port door(s) will auto-close when you power down the turret or the turret runs out of ammo. You need to repeat this system for each turret port you have. If you want to add multiple turrets into a turret port then you will need to include some AND modules so that the doors only auto-close if all turrets run out of ammo. If you want to add a warning/blue light to indicate the turret has run out of ammo, then you will need an additional electrical branch & an AND module because the turret no ammo signal only outputs 1 electric unit. Quick note: turrets without ammo can still be useful as they can serve as alternatives to HBHF sensors via the target detected output signal, so they could be used as perimeter/detection systems.