
6. HARDWARE
173
D LED indication
LED6 (red)
LED5 (green)
LED4 (green)
LED3 (green)
LED2 (green)
LED1 (green)
SW1
(1) Hardware control LEDs
LED No.
Meaning
LED5 Lights when the CPU on the FANUC I/O Link–II board is
running. When the LED is off, it means that the CPU has
been reset.
LED6 Lights when a DRAM parity error is detected.
It is likely that the hardware is defective.
(2) Soft control LEDs
Status LED
(ST4 to 1)
Meaning
JJJJ Immediately after power is switched on.
JJjj Communication board being initialized.
ljjj DI/DO data is being transferred normally.
jjjJ A RAM parity error has occurred.
It is likely that the hardware is defective.
jjJJ An F–BUS error has occurred.
jjJj An F–BUS system emergency condition has occurred.
Alternatively, a communication error (FCS error, com-
mand error, frame length error, response time–out, etc.)
has occurred.
ljJj
ljjj
A communication error has occurred, resulting in error log
being stored. Communication with a slave station has
restarted. LED2 goes off when a log command (monitor
function) is used. It goes off also when the communica-
tion error log is erased using a clear command.
J: On j: Off l: Blinking