How do you clear a MAJOR ALARM?

• A. Press CANCEL
• B. Can only be cleared by cycling the FS100 controller power OFF/ON
• C. Press RESET softkey
• D. Wait for automatic clearance

Answer: (B)

Major alarms indicate a fault severe enough to stop all robot motion and require reinitialization of the controller. On an FS100, this kind of fault is not cleared by simply acknowledging the message or by a software reset; the processor and safety state must be reinitialized. Cycling the controller power—turning it off and back on—resets the internal state and clears the fault latch, allowing a clean startup afterward.

Other ways like pressing Cancel or using a Reset softkey may clear less severe warnings or non-persistent faults, but they do not guarantee clearing a major alarm. Waiting for automatic clearance isn’t appropriate because the fault state will persist until a deliberate power-cycle reset is performed.