Data exchange from IO-Link via JSON and MQTT becomes possible

IIoT communication from the sensor to the cloud

24.04.2020, 15:00

Data exchange from IO-Link via JSON and MQTT becomes possible

The IO-Link community has published a specification that describes how data from IO-Link can be exchanged via JSON REST and MQTT - in the sense of transparent communication in the IIoT.

Industry 4.0 and the IIoT require transparent communication from the lowest sensor/actuator level through to mobile and cloud-based applications. Simple, standardized and manufacturer-independent protocols that can work across all physical layers to enable global access to identification, diagnostic and configuration data are a decisive factor here.

JSON (Java Script Object Notation) has established itself as a lean exchange format that can be used across all system boundaries for seamless data transport from the automation world to the IT world. An additional definition of the semantics makes the data easy to interpret. This enables seamless connection of the IO-Link level to MES/ERP systems, cloud-based services or generally to applications outside of classic PLC automation.

In order to create uniform, standardized data consistency from the lowest field level to cloud-based services, the IO-Link community has defined a JSON-based exchange format in its own working group and thus the uniform semantic integration from the IO-Link field level to the IT world. The specification includes both the definition of an API as a REST interface and data transport via MQTT.

This standardized exchange format now opens up fundamentally new possibilities, such as cross-manufacturer engineering or global access to measured values or other monitoring data. For example, classic configuration tools can be connected across manufacturers using JSON via REST. In addition, lean "sensor-to-cloud" IIoT applications are also easily possible via the widely used MQTT protocol with the publish/subscribe mechanism. This allows automation tasks to be implemented on a cloud basis with manufacturer-independent components.

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