Very simple question re. FMAX on HEIDENHAIN TNC 355

Hi there,

A real simple quick question to anyone in the know.....

For as long as I've programmed the TNC controls I've always programmed the rapids as max speed feeds (i.e F9999 or F15000) but when using most of the CAM packages the posts output FMAX... Am I being dense? But I've never found away of entering FMAX manually at the keypad?

Any help much appreciated.

James