Hi guys,

I'm trying to read a DB connected by MB_SERVER_DB on a master CPU with the function MB_CLIENT_DB from another slave Cpu.

Can someone explain me how exactly it works? (the guide is as always too confusal)

What parameters i have to set in the function to read an entire DB?

Where the read data are placed after the reading?

Can i read it at every cycle of the CPU or i must call less often?

The parameters of connection are similar to MB_SERVER? is an active connection? the remote port must be refered to the MB_MASTER setting?

Why it gives me the error 16#809B? it's not explained in the connection errors list...

The parameter data_len referes to the length of the data to read meant as type of data or the length of the area that i want to read?

Is it affidable as connection? or may lose data or interrupt the connection?

Any help is really accepted with gratitude! Thanks for you time to read this!

Hi,

sorry I can´t answer your questions but perhaps this FAQ wirth PDF Documentation and V13 Project can help you a little bit more:

How do you program and parameterize Modbus/TCP communication between S7-1500 CPUs and S7-1200 CPUs?

https://support.industry.siemens.com/cs/ww/en/view/102020340

Regards,

Towome