Hi to All!

I have a installation with 6 COM800 Data servers for 3VA brakes with typical configuration:

COM800 data servers are connected to S71500 through profinet.

If power for COM800 falls out, some of 3VA's "forget" their assigned (Modbus?) address, it is reset to default (126). Normal, configured addresses are from 1 to ..., according to position in HW config.

After that happens, I have to go there and set those addresses back to original, with powerconfig tool.

Interesting is, that this happens only with switches on 4 specific COM800 Data servers, but on 2 of them it remains OK even after power-out.

This is very strange, it started happening after 2 years of normal work.

I don't have a clue, what is wrong on those, which go to default address after power out.

Did anybody had something like that already?

Thanks and BR!

uel123.

Hello,

I guess the COM800 are defective.

Please get in touch with the Technical Support:

www.siemens.com/support-request

Best regards and Happy New Year!