HEIDENHAIN TNC 426 PB/M Technical Manual page 714

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Evaluation of the keys by the PLC: MP7645.0 = 1
All keys are evaluated by the PLC.
Module 9036 sets the handwheel axis and handwheel interpolation.
With W766 you can influence the feed rate of the axis direction keys.
MP7645 Initializing parameter for handwheel: if an HR 410 is
installed, MP7645.0 has the following meaning:
MP7645.0 Assignment of the handwheel keypad for HR 410
Input: 0: Evaluation of the keys by NC, including LEDs
1: Evaluation of the keys by PLC
MP7645.1–7 Have no function
MP7670 Interpolation factor for handwheel
Input: 0 to 10
MP7670.0 Interpolation factor for low speed
MP7670.1 Interpolation factor for medium speed (only HR 410)
MP7670.2 Interpolation factor for high speed (only HR 410)
MP7671 Handwheel feed rate in the Handwheel operating mode
with HR 410
Input: 0 to 1000 [% of MP1020]
MP7671.0 Low speed
MP7671.1 Medium speed (only HR 410)
MP7671.2 High speed (only HR 410)
HEIDENHAIN Technical Manual TNC 426, TNC 430