MotorBrake allows the ability
to enable and disable a brake when the motor's amp enable output
is enabled or disabled.
The reason for this is easiest to imagine on a vertical axis of
motion: If you release the brake before enabling servo control on
a vertical axis, the axis will not be controlled and will fall under
the influence of gravity. Likewise, when setting a brake on a vertical
axis, you want to set the brake before turning off the amplifier
so that no motion occurs when disabling the servo control.
NOTE: the only output capable
of being used for a brake is the USER I/O 0 output of the motor.
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