This module allows you to combine different logic source (triggers, gates etc.) into a one logical OR combined output. The top section has 3 inputs and 1 output. This output is normalled into the bottom section input 1 (which also has 3 inputs and 1 output) to allow you to also use the module as a 6-IN 1-OUT The OR is totally passive which means it consumes no power and requires no power cable. *Note this module employs passive diode logic so there is a voltage drop of approximately 0.7V between the input and output.