System Description
Kendrion Kuhnke Automation GmbH
24
17 May 2021
4.4 Status LEDs
LED "EtherCAT Run"
An LED labelled "EtherCAT Run" is located on both the bus coupler and the I/O modules. It indicates
the state of the EtherCAT ASIC.
State
LED flash code
Explanation
Init
Off
Initialising, no data exchange
Pre-Op
Off/green, 1:1
Pre-operational, no data exchange
Safe-Op
Off/green, 5:1
Safe operation, inputs readable
Op
Green, on
Operational, unrestricted data exchange
LED "In L/A", LED "Out L/A"
The "In L/A" and "Out L/A" LEDs are located on the bus coupler. They indicate the physical state of
the Ethernet.
State
LED flash code
Explanation
Not connected Off
No Ethernet connection
Connected
Green, on
Connected to Ethernet
Traffic
Green, flashing
Exchanging telegrams
LED "IO"
Every I/O module has an LED labelled "IO". It indicates the state of the module's I/Os. Refer to the I/O
module sections in this manual to know which states of a module are monitored and indicated.
LED "Power"
An LED labelled "Power" is located on every module that has a power supply connector (e.g. for digital
outputs). It indicates the state of the I/O module's I/O power supply.
State
LED flash code
Explanation
On
Green, on
24 VDC supply ok
Off
Off
24 VDC supply not ok