IEC 60601-1-10:2007+A1:2013+A2:2020 Specifies requirements for the development (analysis, design, verification and validation) of a physiologic closed-loop controller (PCLC) as part of a physiologic closed-loop control system (PCLCS) in medical electrical equipment and medical electrical systems to control a physiologic variable. This collateral standard applies to various types of PCLC, e.g. linear and non-linear, adaptive, fuzzy, neural networks. This collateral standard applies to a closed-loop controller that sets the controller output variable in order to adjust (i.e., change or maintain) the measured physiologic variable by relating it to the reference variable. This consolidated version consists of the first edition (2007), its amendment 1 (2013) and its amendment 2 (2020). Therefore, no need to order amendments in addition to this publication.