Hi Arne,
http://www.lado-tech.net/en/rs333/1-rs333-70.html
the "Digital Programmable design" is related to "You can now program your retract to have delay in live in the pcb board of the retract, with this option you don't need any more your inboard sequencer,..."
so this means, you can program the rectract on a digital way to set a delay or sequences directly in the retract.
that has nothing to do with the control pulse rate of the servo/retract.
bye Andreas