Power rail and lines

Vertical power rails are used in FFLD language to represent the limits of a rung.

The power rail on the left represents the TRUE value and initiates the rung state. Any object connected to this rail is always powered.

Horizontal lines always represent a data flow from the left to the right.

If a vertical line has several items connected on the left, then it represents an OR operation.

You can insert a segment of horizontal line at any location in order to freely draw flow lines. The "vertical line" button enables you to set or remove (toggle) a segment of vertical line on the right of the selected cell.