Name Color Meaning Required action
LED1 to 3 Green These LEDs indicate whether the DeviceNet board is the
master board or slave mode. At power–up, these LEDs
LED1 LED2 LED3
Master board On Off Off
Slave board On On Off
LEDA Red An abnormality occurred in the
internal daughter board.
If this LED goes on,
replace the DeviceNet
This LED is the DeviceNet
module/network status LED. It
indicates whether the power is
supplied to the DeviceNet board
and whether DeviceNet
communication is performed
See the specifications
published by ODVA.
This LED indicates the daughter
board status. When the power
has been turned on, this LED
lights in red. When firmware has
been loaded to the internal
daughter board, the LED lights in
The LED turns red again if an
error occurs on the daughter
If the LED does not
light in green, replace
the DeviceNet board.
This board has a setting pin block TM1 with three pins. The TM1
indicates whether the board is used for the DeviceNet slave function or
When the setting pins are set to SLAVE, the board is used for the
DeviceNet slave function. When the setting pins are set to MASTER, the
board is used for the DeviceNet master function.
The TM1 is factory–set by FANUC according to the specifications. Do
not change this setting.
Name Specification TM1
DeviceNet slave board A02B–0259–J240 SLAVE
DeviceNet master board A02B–0259–J241 MASTER
DeviceNet slave board B A02B–0259–J242 SLAVE
DeviceNet master board B A02B–0259–J243 MASTER
Never touch the setting pins on the daughter board.
D Setting pin TM1