Reference input signal
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5-2-125
A signal external to a control loop which serves as the reference and standard of comparison for the directly controlled variable.
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)
