{description of positioner} {best known value of positioner - need [n] as may be scanned} {raw value of positioner - need [n] as may be scanned} {targeted (commanded) value of positioner - need [n] as may be scanned} {maximum allowable difference between target_value and value} {minimum allowed limit to set value} {maximum allowed limit to set value} {Hardware device record, e.g. EPICS process variable, taco/tango ...}