FB3000 RTU Instruction Manual
D301851X012
November 2023
Service and Troubleshooting 77
International safety regulations restrict the shipment of lithium batteries. If you need to
return the RTU, remove the lithium batteries before you ship the unit. Failure to remove
the lithium batteries may delay or prevent shipment of the RTU.
5.2 Interpreting the Status LEDs
Each of the modules in the RTU includes status light-emitting diodes (LEDs). The meaning
of each LED varies depending upon the color displayed or whether the LED flashes.
Table 5-1. LED Descriptions: CPU Module
Boot memory update in progress
second
seconds followed by ORANGE
for approximately 5 seconds
Alternating RED and ORANGE
with Communication Status
LED also flashing RED and
USB LED also flashing GREEN.
CPU module is in wrong slot (must be
in slot 1). If this sequence occurs at a
rate faster than approximately every
half-second, indicates a hardware
failure. Return CPU to factory for
repair.
n Status
Communication in progress to I/O
module(s)
One or more configured I/O modules
is not communicating with the CPU
Flashing RED (with USB LED
also flashing GREEN and
Module Status LED alternating
RED and ORANGE)
CPU module is in wrong slot (must be
in slot 1). If this sequence occurs at a
rate faster than approximately every
half-second, indicates a hardware
failure. Return CPU to factory for
repair.
Alternating RED and ORANGE
CPU expects an I/O module in one of
the other slots but cannot find it.
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