Product manual

Troubleshooting Tools
Product Manual 27
2.14 Status LEDs description
Each of the units connected to the CAN bus includes 2 or 4 LED indicators which indicate
the condition (health) of the unit and the function of the network communication. These
LEDs are:
All units
MS - Module status
NS - Network status
Some units:
CAN Tx - CAN network transmit
CAN Rx - CAN network receive
MS - Module status
This bicolour (green/red) LED provides device status. It indicates whether or not the device
has power and is operating properly. The LED is controlled by software. The table below
shows the different states of the MS LED.
Description Remedy / Source of fault
Off
No power applied to the device.
Check power supply.
Green
Device is operating in a normal condition.
If no light, check other LED modes.
Flashing green
Device needs commissioning due to
configuration missing, incomplete or
incorrect. The device may be in the
Stand-by state.
Check system parameters.
Check messages.
Flashing red
Recoverable minor fault.
Check messages.
Red
The device has an unrecoverable fault.
Device may need replacing.
Flashing red/green
The device is running self test.
If flashing for more than a few seconds,
check hardware.