datablock with 3 S7-300 using Profibus

lsoto

Hi I have a PLC system with 3 PLC S7-300 Station 1 , Station 2 and Station 3 , I have a function block FB250 in the PLC "Station 3" in this FB i need to use information Of one Data Block(FB125)that is in PLC "Station 1" my Question is :

How I can to acceses to information en DB125("Station 1") form a FB250("Station 3")

Adicional Information

PLC "Station 1" have a MPI address 3
PLC "Station 2" have a MPI address 5
PLC "Station 3" have a MPI address 7
I need use in FB250 a Bit DB125.DBX138.0ofPLC "Station 1"
I needuse in FB250 aBit DB125.DBX138.1 of PLC "Station 1"
I need use in FB250 a bit I29.3 of PLC "Station 1"
Thanks

For more details on using GD communicaion, please have a look on this thread.

Also you can use X_Get SFC to read values from other CPUs on the MPI network
Regards,