Allen-Bradley controllogix 1756-L55M12 User Manual page 132

132 LED Indicators
Color Description
• No tags contain I/O force values.
Off
• I/O forces are inactive (disabled).
• I/O forces are active (enabled).
Solid amber
• I/O force values may or may not exist.
Flashing amber One or more input or output addresses have
been forced to an On or Off state, but the
forces have not been enabled.
Color Description
Off There is no activity.
Solid green Data is being received or transmitted
Color Description
Off The battery supports memory.
Solid green If the
controller is
Series A
Series B
Solid red Either the battery is:
• not installed.
• 95% or more discharged.
Publication 1756-UM001G-EN-P - January 2007
FORCE LED Indicator
RS232 LED Indicator
Recommended Action
No action is required.
No action is required.
BAT LED Indicator
Then
The controller does not
show this indication.
During power-down, the
controller is saving the
project to its internal
nonvolatile memory. If the
BAT LED is solid red before
you turn off the power, the
BAT LED remains solid red
even during the save.
Recommended Action
None
Use caution if you install (add) a force. If you install (add) a force, it
immediately takes effect.
Use caution if you enable I/O forces. If you enable I/O forces, ALL
existing I/O forces also take effect.
Recommended Action
None
None
None
Install a battery.
Replace the battery.