| system constituted by a controlled system and its controlling system, in closed-loop control completed by the measuring element and the reference-variable generating element SEE: Figures 1 and 2. Note 1 to entry: This entry was numbered 351-28-01 in IEC 60050-351:2006. 
Figure 1 – Functional diagram indicating typical elements of an elementary open-loop control system 
Figure 2 – Functional diagram indicating typical elements of an elementary closed-loop control system
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