This bit (status 1) indicates that the axis is either:
Applied to Real or Imaginary Axis Functions
Axis is stopped or coming to rest.
Applied to a Group of Co-ordinated Axes
The axes in the group of co-ordinated axes are stopped or in the process of stopping.
The AXIS_IS_LINKED member axes also have their HOLDING bits set to 1.
Applied to the Group of Slave Axes or SERCOS® Ring Functions
This bit is set to 1 if one or more member axis HOLDING bits are set to 1.
