Publication 1785-UM012D-EN-P - July 2005
F-2 Troubleshooting
PLC-5 Controller

General Problems

Indicator Color Description Probable Cause Recommended Action
PROC Green
(steady) Controller is in run mode and
fully operational Normal operation No action required
Green
(blinking) Controller memory is being
transferred to EEPROM Normal operation No action required
Red
(blinking) Major fault • RSLogix 5
download in
progress
• Run-time error
During RSLogix 5 download, this
is normal operation - wait for
download to complete.
If not during RSLogix 5
download:
• Check major fault bit in status
file (S:11) for error definition
• Clear fault, correct problem, and
return to run mode
Alternating
Red and
Green
Controller in FLASH-memory
programming mode Normal operation
if controller's
FLASH memory is
being
reprogrammed
No action required - allow flash
update to complete
Red
(steady)
Power cycle with problem
battery Battery is low,
disconnected or
not installed
Properly replace or install
battery (see Chapter 1 for more
information)
Red
(steady)
Fault with memory loss New controller
Invalid ControlNet
network address
Controller has
failed internal
diagnostics
Use programming software to
clear and initialize memory
Verify that ControlNet address
switch is not set to 0
Install battery (to preserve
failure diagnostics), then power
down, reseat controller and
power up; then reload your
program. If you are unable to
reload your program, replace the
controller. If you are able to
reload your program and fault
persists, contact Technical
Support at 440.646.6800 to
diagnose the problem.
Off Controller is in program load or
test mode or is not receiving
power
Check power supply and
connections
BATT
PROC
FORCE
COMM
PROG
RUN
R
E
M