CHAPTER
8
DIAGNOSTICS AND TROUBLESHOOTING
Diagnostics have two functions:
n Automatically alter system operation to react appropriately to
operating conditions (particularly in the event of a system fault).
n Provide external indications that enable operating and
maintenance personnel to react appropriately when external
actions are required.
The following diagnostic indicators are provided for the ControlEdge
900 Controller:
Hardware Light Emitting Diodes (LEDs) that assist with
troubleshooting activities solely at the controller. LEDs are also useful
for verifying indications viewed as screen items. LED indicators are
provided for the following hardware components:
n EPM
n IOM
EPM Indicators
The following diagram displays the location of the LED indicators on
the EPM. The following table explains the meaning of each LED state.
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