Have you contacted DMG? I have found them to be extremely helpful.
Not sure if they'l help, but here are the parameters of my 1986 400E with a 432/10. You really need to specify your machine more clearly. Year, controller version, software version etc to have much hope of getting exactly the right parameters.
Here is a link to a 500C's constants:
Maho CNC 432 Maschinenkonstanten - CNC Manual
and a 600E's
MAHO CNC Constantes 600E de JP44 Feuille1 - CNC Manual
You also might want to join the German CNCEcke.de and ask there.
Do you have the punch tape in the control cabinet? The tapes can be human read. Slow and painful, but doable.
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Mark