- Discover IO-Link
- Setup and support
- Understanding the IODD
Discover the power of the IODD
The IODD (IO-Link Device Description) is a compact file describing how IO-Link devices communicate information higher level systems or controllers. It provides details about both cyclic data structure and available acyclic commands.
The IODD is available as a file to upload into your PLC as well as a PDF. It provides full documentation of the location of devices' information and the method of interactiion.
Both file types are available on the Downloads tab of the sensor datasheet page.
The image below shows the some of the information available in the IODD PDF file. It shows how the data is mapped in the PLC. This example is for a radar level sensor, LW2720.
The IODD PDF serves as a compendium and one-stop-shop of available information of an IO-link device, both cyclic and acyclic, and provides a full account of the communication structure.
The IODD contains a host of useful information. Let's break down some of it.
- Device variant - model number, vendor, speed, and highest level capabilities of the device.
- Process data - information about the cyclic data. It includes scaling, multiple configurations if applicable, and the array location for the data.
- Parameter overview - information about the acyclic data. It includes data type, reporting format, and index location.
- Basic settings - device aspects that can be changed remotely by a controller or higher level system.
- System command - expansion of basic settings accessed through acyclic communication, such as reset commands, memory queries, and setpoint configuration.
- Identification - origin and type of device, including serial number. It is used to enable automatic device replacement and error-proofing in maintenance cycles.
- Parameters - full description and structure of individual device parameters.
- Diagnosis - location and structure of diagnostics information.
- Events and error types - event code and error code reference material.
