Rockwell international Allen-Bradley 1747-PT1, Getting Started Manual

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Appendix B
Troubleshooting Errors
Getting Started Guide
for HHT
B–3
The System LEDs are located at different places on the modular system and
the SLC fixed controller. Refer to the Installation and Operation manual for
more information on system LED status. See the figure and table below:
Modular System
SLC 500 Fixed Controller
BATTERY LOW
FORCED I/O
CPU FAULT
PC RUN
BATTERY LOW
FORCED I/O
CPU FAULT
PC RUN
POWER
POWER
Processor LED Status of LED Cause Corrective Action
POWER Off No DC power to backplane
Verify line power within range. Verify
wiring and grounding. Check power
supply fuse. For modular system,
verify power supply jumper is posi-
tioned correctly and that the power
supply has been sized properly for
loading in the rack.
CPU FAULT Steady Bad CPU or firmware improperly
installed
Verify that position of notch in proces-
sor firmware chip matches processor
board diagram. See corrective action
for Power LED.
CPU FAULT Flashing Processor major fault
Correct the problem based on the er-
ror message. First clear the fault.
Then press and return processor to
RUN mode. See processor error
codes.
BATTERY LOW Steady
Battery voltage fallen below thresh-
old to retain RAM memory; or no
battery present; or LED jumper is
missing Replace 1747–BA and do not remove
processor power; or add 1747–BA to
retain RAM memory; or add LED
jumper to prevent the LED from
lighting.
System LED Status
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