What key sequence is used to access the BMON screen while powering on the controller?

The BMON screen, which is crucial for troubleshooting and diagnostics in a FANUC controller, is accessed during the power-up sequence using a specific key sequence. The correct key sequence is F1 and F5.

This combination allows the user to enter the BMON (Built-in Monitor) mode, which facilitates monitoring and interaction with the system's diagnostic tools. This screen provides insight into the status of various system components, memory, and operational parameters, making it a valuable tool for maintenance and troubleshooting.

Using this sequence during power-up ensures that the operator can quickly access vital system information without navigating through other menus or screens. The functionality of the F1 and F5 keys in this context is specifically designed to streamline the access to critical systems diagnostics, highlighting the design efficiency of FANUC's user interface.