There's plenty of shipping examples on digital I/O. Look at Write to 1 Dig Line(8255) or Write 1 Pt to Dig Line(E). These use Write to Digital Line function. There is also the shipping document called LabVIEW Measurements Manual. This is part of the LabVIEW bookshelf on the Help menu. Instead of Write to Digital Line, I prefer to just use Port Write. I attached an example. It configures the port for output and then writes a 0, pauses, and then writes a 1.