LED signals

Overview

SOMANET Servo Nodes have several LEDs that show the Node’s state or indicate errors.

../../../_images/servo_node_led_c4.png

Legend

Symbol Explanation
Off
Constantly luminous
Single flashes (1 pulse per second)
Slow blinking (3 pulses per second)
Fast blinking (10 pulses per second)
Two colored behavior: One part of the LED is constantly luminous, the other is blinking slowly (3 pulses per second)
Two colored behavior: One part of the LED is constantly luminous, the other is blinking fast (10 pulses per second)

Core LED

The tri-color LED is used by the firmware to indicate internal status and errors. It provides an overview of the firmware state at a glance to quickly see whether a drive is operating nominally.

Firmware

CiA 402 State
Not Ready to Switch On Switch on Disabled Ready to Switch On Switched On Operation Enabled Quick Stop Fault and Fault Reaction
EtherCAT State BOOT
INIT
PREOP
SAFEOP
OP

Bootloader

Signals that are shown when the Bootloader is active:

Bootloader State No Fault
(firmware exists)
Fault
(no firmware exists)
Idle
Operation in progress

Note

If your Node is running Bootloader v1.0 you may find the LED fading in rainbow colors indicating that the bootloader is active.

Drive LED

The four LEDs on the Drive module show Hardware Errors.

LED 1: Red LED 2: Red LED 3: Red LED 4: Green Explanation
No error
Watchdog ticks fault
Dead-time fault Phase A
Dead-time fault Phase B
Dead-time fault Phase C
Dead-time fault Phase D
Over-current in Phase A / Phase B / DC-bus
Over-voltage / Under-voltage / Over-temperature

Details about these errors and remedies can be found here: Error Report Object

Com LED

Signals on the Com LED are required for EtherCAT conformity.

LED 1: OUT: ACT LED 2: OUT: LINK LED 3: IN: ACT LED 4: IN: LINK
LINK is constantly showing a green light if there is a cable connected to either OUT or IN.

ACT is blinking when there are transmissions on either OUT or IN.

If none of the LEDs are active, check if the EtherCAT cables are connected properly.