What component should not be removed without expecting to reload software?

The removal of the FROM/SRAM module is significant because it stores critical data, including parameters and user programs essential for the operation of the FANUC system. When this module is taken out, the system loses all of the information that was stored, which necessitates a complete software reload to restore the system to its previous operational state. The FROM/SRAM module is crucial for retaining configuration settings and other vital data that the control system relies on to function properly.

In contrast, components like the control panel, power supply unit, and emergency stop board serve different functions related to user interface, power management, and safety, respectively. Removing these components does not generally lead to a complete loss of stored data or parameters, and they can often be serviced or replaced without impacting the software or requiring a reload. Therefore, the FROM/SRAM module is the only component whose removal directly impacts the software retention aspect in a FANUC control system.