mqtt - PLC Programming & Automation

PLC Industry 4.0: OPC UA, MQTT and Real Data Models

September 13, 2026January 21, 2024 by PLC

Timing chart of an MQTT publish trigger: the broker connection drops and returns, a deadband exceeded pulse and a 30 second heartbeat each raise the publish trigger, and a store and forward flush follows the reconnection

What an Industry 4.0 project really changes on the PLC: the OPC UA server, a UDT to JSON data model, MQTT at the edge, retrofits and security.

IIoT PLC Data with MQTT, Sparkplug B and an Edge Gateway

September 12, 2026January 19, 2024 by PLC

Timing chart comparing a fixed one second poll against report by exception, where the gateway publishes only when the tag moves past its deadband

A working IIoT setup for a plant floor PLC: edge gateway choice, MQTT and Sparkplug B topics, a decoded payload, store and forward, deadbands and security.