IO-Link Publishes New, Machine-Readable Specification for JSON Mapping

Wireless Support for Flexible Applications IO-Link Publishes New, Machine-Readable Specification for JSON Mapping

2026-06-11 From Barbara Weber | Translated by AI 1 min Reading Time

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The IO-Link community announces the release of a new specification 'JSON Integration for IO-Link' for JSON mapping. The new version 2 includes important functional enhancements, including support for IO-Link wireless communication and extended MQTT functions. For the first time, the specification has been fully described with OpenAPI and AsyncAPI and is therefore fully machine-readable.

With standardized interfaces such as JSON, OpenAPI, AsyncAPI and MQTT, IO-Link creates the basis for continuous data flows—from the field level to IIoT and cloud applications.(Image: Profibus user organization) — With standardized interfaces such as JSON, OpenAPI, AsyncAPI and MQTT, IO-Link creates the basis for continuous data flows—from the field level to IIoT and cloud applications.
(Image: Profibus user organization)

The new specification explicitly takes IO-Link Wireless into account. IO-Link data can therefore also be mapped via wireless connections in accordance with the standard—for example for mobile applications, rotating machine parts or installations that are difficult to access—without losing the standardized data structure.

Extended MQTT functionality for IIoT

Another focus is on the expansion of MQTT support. The specification now defines more detailed topic structures for process data, parameters and events. This enables more efficient, event-based communication and a seamless connection to cloud platforms or edge systems.

Machine-Readable Specification Through OpenAPI And AsyncAPI

The consistent use of OpenAPI (for REST-based interfaces) and AsyncAPI (for MQTT) enables a formal, automatically analyzable description of the IO-Link JSON mapping for the first time. The specification is therefore not only documented for humans, but also enables automated software generation for development and test systems.

Bridge Between Automation And the IT World

With this step, IO-Link is setting a new milestone for the standardized, IT-related use of IO-Link data and creating optimal conditions for automation, IIoT and cloud-based applications.

With the combination of JSON mapping, OpenAPI, AsyncAPI, wireless options and extended MQTT, IO-Link specifically strengthens IT/OT convergence. Users receive consistent, standardized access to field data—from the sensor/actuator level to data-driven IT applications.

The new specification is now available for free download on the IO-Link website.

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