4 General Information on IO-Link and OPC UA

4.1 Introduction to IO-Link

4.1.3 Device Description

Each IO-Link Device has an IODD (IO Device Description). This is a device description file which contains information about the manufacturer, article number, functionality etc. This information can be easily read and processed by the user. Each device can be unambiguously identified via the IODD as well as via an internal device ID.