Good Morning 

I have two couples of redundant CPU's, 410E  e 412 5H connected using two ethernet cables 

On CPU 410-E i am using the ports X8 on the 412-5H I' am using two  CP-443-1.

In S7 configure Network.  I Have create 2 connections "S7 fault tolerant" between the Cpu's. (Image 0) Connections are named 1 and 2. I create inside the connections the link between the port X8 of the cpus'410-E nand the CP-443-1 (Image 1 and 2)

In the S7 program i have two SFB , SFB12 and 13 and i have to exchange 200 bytes between the cpu's . Connection 1 for send data from 410-E to 412-5H and viceversa for the connection number 2.

Both programs have B-SEND and B-RCV inside, a B-SEND and B.RCV for connection 1 and the same for connection 2.

B-SEND is called with the connection number 1 when the connection is declared active (Images 3 e 4)

In both cpu's the blocks ends with the error and status at value 1. (Image 4)

And the data are not exchanged, the error (image 5) is not clear for me, and online i haven't found any info on it.

Someone have any idea regarding this issue???

Thanks in advance

Hello Guderian

Perhaps in this FAQ there are a few useful information:

https://support.industry.siemens.com/cs/ww/en/view/43033406

Bye Murof