When replacing a fuse, be sure to remove all power from the system.
There are several causes of alteration to the user program, including extreme
environmental conditions, Electromagnetic Interface (EMI), improper grounding, improper
wiring connections, and unauthorized tampering. If you suspect the memory has been
altered, check the program against a previously saved program on an EEPROM,
UVPROM or Flash EPROM module.
Troubleshooting the 5/01 and
To receive the maximum benefit of this troubleshooting section, we
recommend you follow these steps:
Identify the status of your processor LEDs. See chapter 4 for a
description of LEDs and their different states.
Using the tables on the following pages, match your processor and power
supply LEDs with the status LEDs located in the first column.
Once the status LEDs are matched to the appropriate cable, simply move
across the table identifying error description and probable causes.
Follow the recommended action steps for each probable cause until the
cause is identified.
If recommended actions do not identify the trouble cause, contact your
local Allen-Bradley sales office or distributor.