{"id":8598,"date":"2025-12-22T17:02:33","date_gmt":"2025-12-22T17:02:33","guid":{"rendered":"https:\/\/sensor-online.se\/?post_type=funktions&p=8598"},"modified":"2026-10-11T11:39:14","modified_gmt":"2026-10-11T11:39:14","slug":"plc-datalogger-integration-mqtt-modbus-opc-ua","status":"publish","type":"funktions","link":"https:\/\/sensor-online.se\/sv\/funktions\/plc-datalogger-integration-mqtt-modbus-opc-ua\/","title":{"rendered":"PLC & Datalogger Integration via MQTT, Modbus & OPC UA"},"content":{"rendered":"\n
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PLC and datalogger integration<\/p>\n

PLC and datalogger integration over MQTT, Modbus and OPC UA<\/h1>\n

Collect process data from the equipment you already have, store it, visualise it and act on it, without replacing your PLCs or dataloggers.<\/p>\n

Book a demo<\/a>Call +46 (0)500 6000 22<\/a><\/div>\n

500+ customers<\/b> \u00b7 100,000+ active sensors<\/b> \u00b7 Trusted by Akademiska Hus, Vattenfall, LKAB and HSB<\/p>\n<\/section>\n

How the data flows<\/h2>

From the shop floor to your decisions.<\/p>

Equipment<\/h3>

PLCs, SCADA systems and dataloggers in the field or on the shop floor.<\/p><\/div>

Connect<\/h3>

MQTT, Modbus TCP or OPC UA, whichever the device speaks.<\/p><\/div>

Sensor-Online<\/h3>

Stores, visualises, alarms and reports on every value.<\/p><\/div>

Your systems<\/h3>

Dashboards, alerts, the API and tools such as ERP, BI and maintenance systems.<\/p><\/div><\/div><\/section>\n

Three ways to connect<\/h2>

Use the protocol that fits each device.<\/p>

MQTT for dataloggers<\/h3>

Dataloggers on 4G, 5G, NB-IoT or Wi-Fi publish to the built-in MQTT broker, and Sensor-Online subscribes to the topics. MQTT is lightweight and suits unreliable, low-bandwidth networks.<\/p><\/div>

Modbus TCP for PLCs<\/h3>

Read process values from existing control systems, and write setpoints back.<\/p><\/div>

OPC UA for SCADA and industrial IT<\/h3>

Connect OPC UA servers and clients in both directions and bridge OT and IT in one data layer.<\/p><\/div><\/div><\/section>\n

Which protocol for which job?<\/h2>

A quick guide.<\/p>

<\/th>MQTT<\/th>Modbus TCP<\/th>OPC UA<\/th><\/tr><\/thead>
Typical source<\/th>Dataloggers and remote devices<\/td>PLCs and meters<\/td>SCADA and industrial servers<\/td><\/tr>
Direction<\/th>Device publishes, platform subscribes<\/td>Read and write<\/td>Read and write<\/td><\/tr>
Network<\/th>Mobile data, Wi-Fi, low bandwidth<\/td>Local network<\/td>Local network<\/td><\/tr>
Good for<\/th>Remote sites and many small devices<\/td>Process values and setpoints<\/td>Structured industrial data<\/td><\/tr><\/tbody><\/table><\/div><\/section>\n

What you get once the data is in<\/h2>

Everything you need to run the operation, built in.<\/p>

Time-series storage<\/h3>

Keep years of history and query it instantly.<\/p><\/div>

Dashboards<\/h3>

Real-time charts, gauges, maps and tables for operators and managers.<\/p><\/div>

Alarms<\/h3>

Rule-based alerts by e-mail, SMS, webhook and MQTT.<\/p><\/div>

Reports<\/h3>

Scheduled reports in PDF, Excel or CSV.<\/p><\/div>

Protocol transformation<\/h3>

Receive on one protocol and deliver on another.<\/p><\/div>

Automation<\/h3>

Build flows with the rule engine, Node-RED and n8n.<\/p><\/div><\/div><\/section>\n

Need a datalogger?<\/h2>

Connect any sensor over any network.<\/p>

The yDoc ML-525 is a universal multipurpose IoT datalogger that connects any sensor and any network, and works with Sensor-Online out of the box.<\/p>See the yDoc ML-525 datalogger \u2192<\/a><\/section>\n

Related features<\/h2>

Connect LoRaWAN sensors to PLC and SCADA<\/h3>Read more \u2192<\/a><\/div>

JavaScript rule engine<\/h3>Read more \u2192<\/a><\/div>

Node-RED and n8n automation<\/h3>Read more \u2192<\/a><\/div>

Secure IoT platform with REST API<\/h3>Read more \u2192<\/a><\/div><\/div><\/section>\n

Frequently asked questions<\/h2>
Can Sensor-Online collect data from a PLC?<\/summary>

Yes, over Modbus TCP and OPC UA, with both read and write.<\/p><\/details>

Does Sensor-Online include an MQTT broker?<\/summary>

Yes. Dataloggers and devices can publish directly to the built-in MQTT broker.<\/p><\/details>

Do I need to replace my existing equipment?<\/summary>

No. Sensor-Online connects to the PLCs, SCADA systems and dataloggers you already have.<\/p><\/details>

Can I forward the data to other systems?<\/summary>

Yes. Use the REST API, MQTT, webhooks, Node-RED or n8n.<\/p><\/details>

Can it run on-premise?<\/summary>

Yes, behind your firewall, with your data staying on your own network.<\/p><\/details><\/div><\/section>\n

Connecting PLCs or dataloggers? Talk to an engineer.<\/h2>

Tell us what equipment you have, and we will recommend how to connect it.<\/p>

Book a demo<\/a>Call +46 (0)500 6000 22<\/a><\/div><\/div>\n

All trademarks belong to their respective owners.<\/p>\n