In the following explanation, the LED status is indicated as shown below:
j : Off J : On l : Blinking z : To be ignored
NO. LED 4 3 2 1 Description
1 STATUS jjjj Power off
2 STATUS JJJJ Initial status immediately after power–up
3 STATUS JJJj MPU initialization completed
4 STATUS JJjj Firmware downloading completed
5 STATUS Jjjj Control passed to the OS
6 STATUS jJJJ OS PHASE 1
7 STATUS jJJj OS PHASE 2
8 STATUS jJjJ OS PHASE 3
9 STATUS jJjj OS PHASE 4
10 STATUS jjjl Activation completed
When the Ethernet board has started normally, the LED status indicated
in No. 10 appears. This status is then maintained until an abnormal status
LED name Meaning Required action
LEDB (PAR) A system alarm condition has
occurred on this board.
Replace the board.
No. LED name Communication status
1 LED 5(TX) Turned on when data is received.
2 LED 6(RX) Turned on when data is sent.
3 LED A(COL) Turned on when a data collision has occurred.
The A(COL) LED goes on frequently when traffic (the
amount of communication) in Ethernet communication is
heavy or when there is large ambient noise.
D Status indication
D Alarm indication
D Communication status