24 CompactLogix Controllers
Publication
1768-IN004D-EN-P - December 2009
OK Off No power is applied. If MEM SAVE indicator is green,
the user program and configuration data are being
saved to flash memory.
Flashing red • The controller requires a firmware update or a
firmware update is in progress.
• A recoverable major fault occurred on the
controller.
• A nonrecoverable major fault occurred on the
controller.
• See Clear
a Major Fault on page 26.
Red The controller detected a nonrecoverable major fault so
it cleared the project from memory.
See Clear a Nonrecoverable Fault
on page 27.
Green Controller is OK.
Flashing green The controller is storing or loading a project to or from
nonvolatile memory.
CF Off There is no CompactFlash card activity.
Flashing green The controller is reading from or writing to the
CompactFlash card.
IMPORTANT: Do not remove the CompactFlash card
while the controller is reading from or writing to the
card. Removing the card during a read or write could
corrupt data on the card, data in the controller, and
firmware installed on the controller.
Flashing red The CompactFlash card does not have a valid file
system and must be replaced.
DCH0 Off Channel 0 is configured differently than the default
serial configuration.
Green Channel 0 has the default serial configuration.
CH0 Off No RS-232 activity.
Green RS-232 activity.
Controller Status Indicators
Indicator State Description
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