An input variable established by means external to and independent of the automatic control system which is intended to determine the value of the controlled variable.
Figure 2 - Block diagram of automatic control system (5-2-045) incorporating a closed loop (5-2-080)
Reference: ANSI (modified)
Note:: The French word "commande" is generally used to mean control.
Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)
International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM