PLC and Datalogger Integration via MQTT, Modbus TCP, and OPC UA

Sensor-Online is a flexible IoT platform designed to
receive, process, and exchange data with PLC systems, dataloggers,
and industrial control environments using widely adopted industrial protocols.

By supporting MQTT, Modbus TCP, and OPC UA, Sensor-Online acts as a powerful
integration layer between traditional industrial automation systems and modern IoT solutions.

Receive Data from PLCs and Dataloggers

Sensor-Online functions as a centralized data hub, collecting measurements,
status values, and process data from external systems and devices.

  • MQTT for real-time data from dataloggers and edge devices
  • Modbus TCP for integration with PLCs and industrial controllers
  • OPC UA for standardized and structured industrial communication

All incoming data is time-stamped, securely stored, and immediately available
for dashboards, analytics, reporting, alarms, and automation.

Bidirectional Communication – Send Data Back to Industrial Systems

Integration in Sensor-Online is not limited to one-way data collection.
The platform also supports sending data back to PLCs, SCADA systems,
and external control environments.

  • Transfer processed sensor data to PLC or SCADA systems
  • Send calculated values, KPIs, and setpoints
  • Distribute configuration and control parameters
  • Enable closed-loop automation and control workflows

This bidirectional communication enables more advanced, responsive,
and tightly integrated automation solutions.

MQTT for Efficient and Scalable Real-Time Data Exchange

MQTT is well suited for efficient, reliable data transfer from
dataloggers, gateways, and industrial IoT devices.

  • Low bandwidth usage and high reliability
  • Publish/subscribe communication model
  • Ideal for distributed and large-scale deployments

Modbus TCP and OPC UA for Industrial Compatibility

For environments where PLCs and SCADA systems are central,
Sensor-Online supports widely used industrial standards.

  • Modbus TCP for simple, proven PLC integration
  • OPC UA for secure, scalable, and structured communication
  • Consistent and standardized data models across systems

This ensures smooth interoperability between modern IoT platforms
and existing industrial infrastructure.

A Central Integration Hub for IT, OT, and IoT

By supporting both inbound and outbound communication across multiple protocols,
Sensor-Online becomes a central integration hub for IT, OT, and IoT systems.

  • Unify data from PLCs, dataloggers, and IoT sensors
  • Centralize logic, analytics, and configuration management
  • Reduce system complexity and integration effort
  • Enable scalable and future-proof architectures

The result is a highly flexible platform that enables seamless data exchange
and long-term integration across industrial and IoT environments.