Dear Members,

I would like to use all the diagnostic functions in my program, and I’m now programming the Extended instruction: LED (Read LED status)

According the Help file you could also get the status of the Link and Rx/Tx LED on the CPU. But the only status I get from it is: 9 = LED exists, but status information not available.

During installation of the CPU I could see myself off course that the LED’s are existing, and I would not expect someone to pullout the LED’s from the CPU so the message is useless. So why are these LED’s mentioned in the Function and Help file or is it a bug in the Firmware (V4.0) ?

http://support.automation.siemens.com/WW/view/en/105825934

5: Link (green) and

6: Rx/Tx (yellow)
are always

9 = LED exists, but status information not available.
But I think this isn't bug. It means that you don't get more information (only that it exists).
If you wanna be sure, you could ask the SIEMENS hotline:
Support Request