IEC 61800 series - Adjustable speed electrical power drive systems Updated at: 03-02-2021 Show more information ICT performance characteristics Interoperability (ICT) Industrial Reference ICT Architectures Reference Architectural Model Industrie 4.0 (RAMI 4.0) RAMI 4.0 Vertical Axis and associated standards Function Layer (RAMI 4.0) IEC 61800 Series Adjustable speed electrical power drive systems