What configuration must all devices communicating with a controller be added to?

When configuring devices that communicate with a programmable controller, it is essential for all devices to be added to the I/O configuration of the controller. This is because the I/O configuration defines the interface between the controller and the various input/output devices that the system will interact with.

Input devices, such as sensors and switches, provide data to the controller, while output devices, such as actuators and indicators, receive commands from the controller. By ensuring that all devices are included in the I/O configuration, the controller can effectively manage data flow, respond to inputs, and control outputs as required by the application.

This configuration also facilitates proper addressing and communication protocols necessary for the controller to identify, read from, and write to each device. In essence, establishing the correct I/O settings is vital for the overall functionality and communication efficacy of the networked system.