What visual cue indicates the IFM is powered off?

• A. A warning message on the EUFD
• B. A red fault light on the IFM
• C. No Power Status symbol (H,M,L) is displayed on FM1 line on EUFD
• D. The IFM displays 'OFF' on its own display

Answer: (C)

The main idea is how power state is shown in the system’s interface. The EUFD has a dedicated FM1 line that normally displays a Power Status symbol (high, medium, or low) to show that the IFM is powered and its power level is available. If the IFM is powered off, that Power Status symbol does not appear on the FM1 line. So the absence of any Power Status symbol on that line is a clear, deliberate cue that the IFM is not powered.

This cue is reliable because it’s built into the display system to indicate power status directly. Other signs—like a warning message, a fault light, or the IFM showing “OFF” on its own display—could point to faults or other states and aren’t as definitive for simply confirming power off. The designed indicator is the missing Power Status symbol on the FM1 line, which specifically signals power absence.