User`s guide

Working with VRML Sensors
3-25
ROUTE Grab_Sensor.translation_changed TO Ball.translation
You can use this method to input information from all VRML node fields of the type
exposedField or eventOut, not only a Sensor eventOut field. See VRML Data
Class Types for more information about VRML Data class types.
For fields of class exposedField, you can use an alternate name using
the field name with the suffix, _changed. For example, translation and
translation_changed are alternate names for requesting the translation field
value of the above Grab_Sensor node.