Directly controlled variable

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In a control loop, that variable the value of which is sensed to originate a feedback signal.

Ch5 Fig2.jpg

Figure 2 - Block diagram of automatic control system (5-2-045) incorporating a closed loop (5-2-080)

Reference: ANSI (modified)

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