What must all devices that communicate with the controller be added to in the controller project's configuration?

In the context of a programmable controller's project configuration, all devices that communicate with the controller are typically incorporated into the I/O configuration. This is essential because the I/O is responsible for defining and managing the inputs and outputs that the controller uses to interact with various hardware devices.

By establishing the devices within the I/O configuration, the controller can appropriately recognize and communicate with them. This includes defining the data types, the addressing of the devices, and the operational parameters for each device connected to the system.

While other components like the Device Network or Channel Configuration serve critical roles in the overall project setup, they are often supplementary to the foundational I/O configurations where device communication is primarily managed. In summary, including devices in the I/O section is a definitive requirement for ensuring successful communication between the controller and the connected devices within the project configuration.