Hello,

Does anyone know if this model 6ED1052-1MD08-0BA1 have built in a RTC and Astronomical clock?

I can't find it in the manual.

So I understand that my OBA1 does not have RTC and astronomical clock?

And I have to buy a 0BA8?

mati_0089

So I understand that my OBA1 does not have RTC and astronomical clock?

And I have to buy a 0BA8?

You understand incorrectly. Carefully study the text file that Mr. ixo65 shared with you. The part you have is of higher generation than what you call "OBA8".

The instructions you need are available. Search for it in the software where you'll see it. May I assume you know how to tell the software which version of hardware you have?

How reliable the RTC is, is another question. But THAT is the one you need to ask about and consider. Study the System Manual for the LOGO! for more detail about that.