Introduction
The green memory card access LED underneath the SD memory card door indicates the controller access to the memory when a card is inserted. This LED can be seen when the door is open.
Dedicated LED States
By itself, the LEDs indicate these states:
LED Status |
Description |
|---|---|
ON |
The memory card is recognized, but the controller is not accessing it. |
flashing |
The controller is accessing the memory card. |
OFF |
The memory card can be removed from the controller slot or the controller does not recognize the memory card. |
Combined LED Meanings
The access card LED operates together with the BACKUP LED. Their combined patterns indicate the following diagnostic information:
Memory Card Status |
Conditions |
Controller State |
Memory Card Access LED |
BACKUP LED |
|---|---|---|---|---|
no memory card in the slot |
— |
no configuration |
 |
|
memory card not OK |
— |
no configuration |
 |
|
memory card without project |
— |
no configuration |
 |
|
memory card with a non-compatible project |
— |
no configuration |
|
|
memory card with a compatible project |
An error is detected when the project is restored from the memory card to the controller RAM. |
no configuration |
during transfer: end of transfer: |
during transfer: end of transfer: |
No error is detected when the project is restored from the memory card to the controller RAM. |
— |
during transfer: end of transfer: |
during transfer: end of transfer: |
|
– no specific circumstances or controller state |
||||
This legend shows the different LED patterns:
Symbol |
Meaning |
Symbol |
Meaning |
|---|---|---|---|
|
off |
|
steady red |
|
steady green |
|
flashing green |