The Close-Relay Action will make a task set an output relay state to high.
When using the Close-Relay action, you can type in a variable name for the Output Relay Channel. An example of this is in the picture above, which declares a variable in the loop and sets the Relay that will close to the variable as it goes through the loop. So in the example above since the loop starts at 1 and end 3 at three, the loop will first close output 1, then 2, then 3.