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IEVref:351-49-08ID:
Language:enStatus: Standard
Term: final controlling element
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Definition: functional unit forming part of the controlled system and arranged at its input, driven by the manipulated variable and manipulating the mass flow or energy flow

SEE: Figures 1 and 2.

Note 1 to entry: If the final controlling element is mechanically actuated, an additional actuator (positioner) is used in some cases.

Note 2 to entry: The output variable of the final controlling equipment is usually not free from feedback. The interface between the actuator and the final controlling element should therefore be selected in such a way that the manipulated variable is not affected by feedback from the final controlling element.

Note 3 to entry: This entry was numbered 351-28-08 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


Publication date:2013-11
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