Function block diagrams rendered box by box: AND, OR, timers, flip-flops, MOVE and comparators. Select a box, wire an output to an input, edit an operand, and push.
&, ≥1, X, =, S, R, SR, RS, P, N, TON, TOF, TP, MOVE, ==, >, < with one click.
Click an output, then an input pin, and the connection is made.
SCL networks inside an FBD block stay editable as text.

