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14.1.2 CPU LED Status Indications
CPU Front Panel LEDs
LED
SYSTEM
State
Description
Slow flash
Normal operation
(Green)
Medium flash
Normal operation, Fault present
Very fast
flash
Restricted mode - no applications running *
COMMS
Communications
On
Under UTC control, pulses off indicate receipt of
messages
(Green)
Off
Not under UTC control, pulses on indicate receipt of
messages
BUSY
Off
Normally off
(Red)
Flashing
Flashes to indicate the system is busy performing an
operation that must not be interrupted, for example
start up, upgrade, USB "memory stick" style interface
is busy. Do not remove USB device or switch off the
outstation while this LED is flashing.
Table 3 – CPU Front Panel LED States
* Restricted mode is similar to safe mode on a PC where the user can access the unit
to examine logs, diagnose problems and perform firmware updates.
TOP
BOT
LED
Ethernet
Connectivity
(2x Green
inboard)
State
On / Flashing
In-Board Ethernet LEDs
Description
Indicate activity for the two Ethernet interfaces,
corresponding to the Top (eth1) and Bottom (eth0)
Ethernet RJ45 sockets.
Instation comms is normally via the bottom RJ45.
Table 4 – CPU In-Board Ethernet LED States
Security classification
Unrestricted
Page
91 of 98
Version
3
Status
Released
Last Editor
Jim BallantineJ. Ballantine
Date
Feb 2015
Document Name
User Interface Handbook
Document No.
667/HU/46000/000
Copyright © Siemens plc 2015. All Rights Reserved. Mobility and Logistics is a division of Siemens Plc