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MQTT is a Client Server publish/subscribe messaging transport protocol. It is light weight, open, simple, and designed so as to be easy to implement. These characteristics make it ideal for use in many situations, including constrained environments such as communication in Machine to Machine (M2M) and Internet of Things (IoT) contexts where a small code footprint is required and / or network bandwidth is limited.

Janz Tec developed a CODESYS library which implements the MQTT protocol. This way users can add the MQTT protocol easily to their own IEC 61131 applications. The Janz Tec MQTT library for CODESYS implements client functionality. It is completely written in IEC code which guarantees the library can be used on any type of target system.

The framework “SQL4CODESYS” allows direct communication between CODESYS controls and databases. With the database, large amounts of data can be efficiently managed, which opens up many new possibilities (detailed logging of information, flexible production by retrieving production parameters, recording of process values during production for traceability, interface to ERP and order management systems, …).

Compared to systems which communicate via an OPC interface, the software architecture is considerably simpler and more powerful with this approach!

The framework has been developed and can be used for a variety of databases, PLC and robot controls.