CHAPTER 5: SYSTEM MAINTENANCE
SNAP PAC Redundancy Option User’s Guide
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Arbiter Status LEDs and Blink Codes
The following diagram shows the location of the arbiter’s status LEDs. See below for descriptions of
the LEDs and the system blink codes.
Serial activity
Ethernet
activity
Arbiter status
Controller 2 status
System status
Controller 1 status
not used
not used
not used
Communication Status LEDs
LED
Indicates
LNK
Link established with Ethernet network
ACT
Ethernet network activity
TX
Outgoing serial activity
RX
Incoming serial activity
System Status LEDs
LED
Indicates
ARB
Arbiter Status
Off = arbiter has failed or is not powered
Red = arbiter has failed
Orange = arbiter is starting
Green = arbiter is online
SYS
Controller Redundancy System Status
Red = no controller is active
Orange = one controller is active, with no qualified backup
Green = one controller is active, with a qualified backup
CTR1
Controller 1 Status
Red = failed
Orange-blinking = backup is qualified but cannot communicate
with one or more configured I/O units, or not qualified
Orange = backup qualified
Green-blinking = becoming active, or active but cannot communi-
cate with one or more configured I/O units
Green = active nominal
