LadderLens

[ ] normally open — passes power when TRUE  ·  [/] normally closed — passes power when FALSE
green = energized this scan  ·  arithmetic uses function blocks, not operators
an IF/ELSE in text becomes two rungs gated by the same variable and its complement

the diagram is editable: click a tag, pin, or coil to rename it · click a contact symbol to flip [ ]/[/] · drag ⋮⋮ to reorder rungs · drag contacts to reorder them · × deletes · type any expression into a pin
diagram edits regenerate the text in flat rung form — complementary rungs collapse back to IF/ELSE, comments are dropped