
6. HARDWARE
223
D LED display
• Status transition at power–up, displayed by the green LEDs
No.
4 3 2 1 Board state
1 jjjj Power off
2 JJJJ Initial state immediately after power–up
3 JJJj MPU initialization completed
4 JJjj Firmware downloading completed
5 Jjjj Control transferred to OS
6 jJJJ OS PHASE 1
7 jJJj OS PHASE 2
8 jJjJ OS PHASE 3
9 jJjj OS PHASE 4
10 jjjl Start–up completed
If the board has normally started up, the LEDs display the pattern of No.10.
The LEDs keep this pattern until an error occurs.
• Status LED display when an error occurs (green)
The status LEDs alternately display the LONG and SHORT patterns.
The LONG pattern is held longer than the SHORT pattern.
(1) For Ethernet board
STATUS LED
indication
No.
LONG
4321
SHORT
4321
Board state
1 Jjjj jjjJ Failure caused by System reset
2 Jjjj jjJj
this board.
Machine check
3 JJjj jjjJ DRAM parity alarm
4 JJjj jjJj Failure caused by
another board.
NMI of another
module
(2) For fast Ethernet board
STATUS LED
indication
No.
LONG
4321
SHORT
4321
Board state
1 JJjj jjJJ Failure caused by
this board.
SDRAM parity
alarm
2 JjJj jjjj General invalid
instruction
3 JjJj jjjJ Invalid slot instruc-
tion
4 JJjj jjjJ Failure caused by
another board.
NMI of another
module
NOTE If an error, indicated by repeatedly flashing a LONG and SHORT
combination other than the above, occurs, contact FANUC.