| Definition: | linear time-invariant transfer element created by the additive combination of a proportional element, an integral element and a derivative element Note 1 to entry: The transfer function of an ideal proportional plus integral plus derivative element is given by 
where
| KP | is the proportional action coefficient; |
| Td | is the rate time; |
| Ti | is the reset time; |
| s | is the complex variable of the Laplace transform; |
| U(s) | is the input transform; |
| V(s) | is the output transform. |
Note 2 to entry: This entry was numbered 351-28-30 in IEC 60050-351:2006.
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