With the help of device objects you can map hardware to be controlled in a tree structure in your CODESYS project. This makes the linking of hardware and application easy to handle.

In the configuration editors of the device objects, you can configure the settings for the communication between CODESYS and the controller, and above all for I/O mapping. The I/O mapping is the linking of the inputs and outputs of the controller with the variables of your application.

Access to control objects at runtime can be controlled, depending on the device, via an "online user management", which you can edit – likewise depending on the device – in the Automation Builder. Moreover, communication with the controller depends on the current "security settings".