Command PositionKnown :

do not call directly, to be called from motor device

PositionKnown Definition
Input Argument	Tango::DEV_ULONG	Axis number
Output Argument	Tango::DEV_BOOLEAN	true if position is known, false if not
DisplayLevel	OPERATOR	..
Inherited	false	..
Abstract	false	..
Polling Period	Not polled	..
Command NOT allowed for	FAULT	..