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Component identification 20
Item Color Name Interpretation
Off = Controller is in an idle or runtime state.
Flashing 5 Hz = Controller and cache are performing a backup.
2
Red Fault When an error occurs, this LED is on. During power up, this LED
is solid for up to 2 seconds.
3
Green Heartbeat When the controller is in good health, this LED flashes at 1 Hz.
During power up, this LED is solid for up to 2 seconds.
P421 LEDs
Item Color Name Interpretation
1
Green Heartbeat When the controller is in good health, this LED flashes at 1 Hz.
During power up, this LED is solid for up to 2 seconds.
2
Red Fault When an error occurs, this LED is on. During power up, this LED
is solid for up to 2 seconds.
3
Amber Debug On = Controller is in reset.
Off = Controller is in an idle or runtime state.
Flashing 5 Hz = Controller and cache are performing a backup.