
1.4.4.1.3 State LEDs
The EtherCAT state is shown by the EtherCAT communication module's LEDs. Some LEDs are
two-colored.
Table 57: Meaning of the diagnosis LEDs
LED
Color
State
Description
PWR
Green
On
Power supply available
Blinking
---
Off
Power supply not available or defective
hardware
RDY
Yellow On
Boot procedure
Blinking
Boot failure
Off
---
RUN
Green
On
Communication module is operational
Blinking
---
Off
Communication module is not operational
STA1
Green
On
No bus error, communication running
Blinking
Establishing communication
Off
System error
STA2
Red
On
Configuration error
Blinking
---
Off
No error
STA1
Yellow Blinking
(synchronously)
No production data available,
no bus communication possible.
STA2
Yellow
LED state
during
firmware
update
STA1
Green
Blinking
(synchronously)
Firmware file transfers during
communication module firmware update.
STA2
Red
STA1
Green
Blinking
(alternately)
Communication module writes the
firmware file to the internal flash.
Do not power off the PLC!
STA2
Red
The RJ45 Ethernet connector contains two LEDs showing the current Ethernet port connection
state.
Table 58: Meaning of the diagnosis LEDs
LED
Color
State
Description
ETHCAT1 LED "Link"
Green
On
Ethernet connection established
Off
No Ethernet connection
ETHCAT1 LED "RX/TX"
Yellow
On
Device sends/receives frames
Off
No Ethernet connection
ETHCAT2 LED "Link"
Green
Connector ETHCAT2 is not used
ETHCAT2 LED "RX/TX"
Yellow
Device specifications
Communication modules (AC500 standard) > EtherCAT
2022/01/31
3ADR010278, 3, en_US
114