What do the two LEDs mean on the top of the NI 9881 CANopen module?

[wireman]

I have looked through the documentation for the NI 9881, but have not found any mention of the meaning of the two LEDs. Does anyone know what they mean?

[Jacob_K · Accepted solution]

Please review the XNET Hardware Manual found here:

http://www.ni.com/pdf/manuals/372840c.pdf

See page 3-16

NOTE: XNET means underlying driver components used by CANopen as well.

[GPIB_Guru]

I don't think XNET and CANopen use the same LED definitions.

The CANopen LED usage is documented in the CANopen spec, part 3 "Indicator specification".This should be available on the web.

Key experpts:

One LED shall be red and shall be labeled as ERR LED. This LED shall be called theerror LED
The other LED shall be green and shall be called and labeled as RUN LED.

Mandatory ERR LED table:

ERR LED                   State                                   Description

Off                             No error                               The device is in working condition

Single flash                Warning limit reached            At least one of the error counters of the CAN controller has reached or exceeded the warning level
Double flash                Error control event                A guard event (NMT-slave or NMTmaster) or a heartbeat event (heartbeat consumer) has occurred
On                             Bus off                                The CAN controller is bus off

Mandatory Run LED table:

CAN Run LED                   State                                   Description

Blinking                            PREOPERATIONAL              The device is in state PREOPERATIONAL
Single flash                       STOPPED                            The device is in state STOPPED

On                                   OPERATIONAL                      The device is in state OPERATIONAL

[wireman]

Does anyone know if the LED states can be read programmatically? (e.g. to tell if the CANopen bus power is present)