Publication 1747-RM001G-EN-P - November 2008
Troubleshooting Faults 16-15
Troubleshoot SLC 5/03 and
Higher Processors
Between the time you apply power to the processor, and it has a chance to
establish communication with a connected programming device, the only form
of communication between you and the processor is through the LED display.
Powerup LED Display
When power is applied, all the LEDs flash on momentarily and then off. This
is part of the normal power-up sequence. Following the self test by the
processor, all of the LEDs flash on again momentarily. If a user program is in
a running state, the RUN LED is illuminated. If a fault exists within the
processor, the FLT LED is illuminated.
Identify Processor Errors while Downloading an Operating
System
The download process takes up to 90 seconds. During this time, watch the
LED display for status information. While the download is in progress, the
RUN and FLT LEDs remain off. The RS232, DH-485 or DH+, Ethernet,
FORCE, and BATT LEDs illuminate in a pre-defined sequence. If the
download is successful, the above LEDs are illuminated.
If during the download process of an operating system type memory module
or during the normal power-up self test process an error occurs, the FLT LED
is illuminated and the four LEDs flash on and off at a rate of 2 seconds.
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