The Twincat IoT Communicator from Beckhoff enables communication between the PLC and a mobile device. It connects the 'Twincat' controller directly to a messaging service via secure TLS encryption. With the associated 'IoT Communicator App', the process data is clearly displayed on the end device. Alarms are sent via push message. The 'IoT Communicator' uses the publish/subscribe method to exchange data. Special firewall settings are unnecessary, which simplifies integration into an existing IT network. Information is exchanged via a message broker that uses the MQTT protocol and acts as a central messaging service in a cloud or local network. The transmitted process data is displayed on the end device via the 'IoT Communicator App' (available for iOS and Android).