Function blocks (FB) for process control - Part 3: Electronic Device Description Language (EDDL) (IEC 61804-3:2006); German version EN 61804-3:2007, text in English— 385 стр.
Function blocks (FB) for process control - Part 2: Specification of FB concept (IEC 61804-2:2006); German version EN 61804-2:2007, text in English— 63 стр.