IEC 61131-9:20 22规定了用于小型传感器和执行器SDCI的单点数字通信接口技术（通常称为IO-Link？），它将IEC 61131-2中定义的传统数字输入和数字输出接口扩展到点对点通信链路，用于双向交换复杂数据。这个电子音乐？逻辑还能够将参数传送到设备，并将识别和诊断信息从设备传送到自动化系统。 该技术主要用于工厂自动化中的简单传感器和执行器，其中包括小型且经济高效的微控制器。 本文档规定了SDCI主机和设备的SDCI通信服务和协议（根据ISO/OSI参考模型的物理层、数据链路层和应用层）。本文档还包括EMC测试要求。 本文档不涵盖包含多点或多点链路的通信接口或系统，或将SDCI集成到更高级别的系统（如现场总线）中。

IEC 61131-9:2022 specifies a single-drop digital communication interface technology for small sensors and actuators SDCI (commonly known as IO-Link？ ), which extends the traditional digital input and digital output interfaces as defined in IEC 61131-2 towards a point-to-point communication link for the exchange of complex data in both directions. This techno？logy also enables the transfer of parameters to Devices and the delivery of identification and diagnostic information from the Devices to the automation system.
This technology is mainly intended for use with simple sensors and actuators in factory automation, which include small and cost-effective microcontrollers.
This document specifies the SDCI communication services and protocol (physical layer, data link 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 document does not cover communication interfaces or systems incorporating multiple point or multiple drop linkages, or integration of SDCI into higher level systems such as fieldbuses.