The forcefield emitter projects a solid energy barrier around itself, allowing you to block off areas of your ship/station. You can either place an emitter down which will automatically detect the size of its surroundings and create a forcefield wall, or you can right click an existing prop with the forcefield tool to convert it into a forcefield.
Wire inputs
Activate - Turns the forcefield on or off. Level - Sets the strength of the forcefield, between 1 and 10. Higher strengths can take more damage but use more energy. Note that you can only change it when the field is off. Hangar Mode - Sets whether the forcefield should allow props through while still blocking players. Useful for a docking area. Immunity - Sets whether to always allow yourself and your own props through.