A generic positioner such as a motor or piezo-electric transducer. symbolic or mnemonic name (one word) 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 velocity of the positioner (distance moved per unit time) time to ramp the velocity up to full speed Hardware device record, e.g. EPICS process variable, taco/tango ...