HEIDENHAIN MANUALplus 620 Technical Manual page 876

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The drive controller cannot be switched on until the control-is-ready signal of
the inverter, the global drive enabling through -ES.B and the axis group
enabling are available.
Note
If you do not want to use drive enabling for axis groups, but rather just
global drive enabling through -ES.B, set MP_driveOffGroup=NONE for all
axes, or remove the parameter from your configuration.
HEIDENHAIN Technical Manual MANUALplus 620