---
title: "PLC connectors: OPC UA, MQTT, Modbus — logiccloud"
description: "The protocols logiccloud CONTROL connects to: OPC UA client and server, Modbus TCP/RTU, MQTT with Sparkplug B, Kafka, InfluxDB, REST, SAP and Node-RED."
url: https://logiccloud.com/en/products/control/connectors/
language: en-GB
---

logiccloud CONTROL · Connectors

More than 15 connectors.\
Configured in the project.
==========================

From OPC UA and Modbus at the machine to MQTT, Kafka and SAP in IT — the systems CONTROL connects to directly.

[Try CONTROL for free](https://logiccloud.com/en/register/) [Read the documentation](https://docs.app-eu.logiccloud.io/)

At the machine

## Industrial protocols

- ### OPC UA — client and server

  CONTROL reads and writes as an OPC UA client, with live browsing of variables, and provides its own values as an OPC UA server.

- ### Modbus TCP and Modbus RTU

  Over Ethernet, or serially over RS-232 and RS-485.

- ### IO-Link

  Through IO-Link masters that offer a REST interface (JSON over HTTP).

- ### Local inputs and outputs

  Dedicated connectors for the I/O of the WAGO CC100, the WAGO PFC200, the Raspberry Pi GPIOs and the KUNBUS Revolution Pi.

Into IT

## Data and IT systems

- ### MQTT

  To your own broker or to logiccloud’s built-in broker.

- ### Sparkplug B

  To the Sparkplug B 2.2 specification — for consistent data models over MQTT.

- ### Apache Kafka

  Process data straight into your streaming platform.

- ### InfluxDB

  Write process values to the time-series database.

- ### HTTP/REST and REST-RPC

  REST calls from inside the control program — with RPC_CALL, a logiccloud extension to Structured Text.

- ### SAP

  Send process variables to an SAP web service.

Platforms and tools

## Device platforms and services

- ### ctrlX Data Layer

  Data exchange with apps on ctrlX OS from Bosch Rexroth.

- ### Weidmüller u-OS Data Hub

  Connection to the Data Hub of Weidmüller u-OS.

- ### Node-RED

  As a connector — and, if you wish, as an additional service right on the device.

- ### Grafana

  Embed panels and dashboards straight into an HMI page.

- ### Tibber

  Current electricity prices as an input to the control.

## Frequently asked questions about the connectors

My protocol is not listed. What now?

Fieldbuses such as PROFINET and EtherCAT, and S7 communication, are not among the documented connectors. A gateway with OPC UA or Modbus often closes the gap — talk to us about your plant.

Can I connect my own systems?

Yes, over HTTP/REST: with RPC_CALL the control calls REST interfaces directly from Structured Text, and over MQTT you can reach practically any IT system.

Where do I find the setup details?

Every connector has its own page in the [product documentation](https://docs.app-eu.logiccloud.io/).

## Try the connection on your own project.

With trial access you set up connections and see the values live in the browser.

[Try CONTROL for free](https://logiccloud.com/en/register/) [Request a demo](https://logiccloud.com/en/demo/)