DURKOPP ADLER 581 Operating Instructions Manual page 50

Programming
Fig. 32: Single buttonhole mode
⑧
(8) - Buttonhole number
It is possible to see which field is active by the white lettering on
a dark background.
For subclasses 312, 321 and 341, there is also monoflex mode,
as 2 blade positions are possible.
Active monoflex mode is indicated by display of a bar next to the
buttonhole shape:
Fig. 33: Monoflex mode
⑨ ⑩
(9) - Blade position 1 (10) - Blade position 2
48 Operating Instructions 581 - 01.0 - 05/2016