DIN EN IEC 61131-9:2024-12

This part of the IEC 61131 series of standards defines the technology of a digital point-to-point communication interface for small sensors and actuators - SDCI (commonly known as IO-LinkTM) - that extends the conventional interfaces of digital inputs and outputs, as defined in IEC 61131-2, by a point-to-point communication link. This document specifies the SDCI communication services and protocol (physical layer, datalink layer and application layer in accordance with the ISO/OSI reference model) for both SDCI Masters and Devices. This document also includes EMC test requirements. This technology is mainly intended for simple sensors and actuators in factory automation that use small, cost-effective microcontrollers. This part does not cover communication interfaces or systems incorporating multiple point or multiple drop linkages, or integration of SDCI into higher level systems such as field buses. The standard differs from DIN EN 61131-9 (VDE 0411-509):2015-02 as follows: a) the requirements for port class B have been specified in more detail; b) recognized patterns for data storage (backup of device parameters) and device reset functions have been introduced; c) a new standardized master interface (SMI) for PLCs, IT, and access to engineering tools has been added. This technology enables the transfer of parameters to Devices and the delivery of diagnostic information from the Devices to the automation system.