Hi All,

We have configuration with S7 400H PLC with 2 numbers CP 443-1 in each Racks ( Rack 0 and Rack 1) , each WinCC Server's are installed with 2 number of CP 1623 card.

There are two plant bus networks configured,

1st CP 443-1 of Rack 0 and Rack 1  and 1st CP 1623 are connected via Plant Bus 1. 

2nd CP 443-1 of Rack 0 and Rack 1 and 2nd CP 1623 are conected via Plant Bus 2.

Named connection can be created between 2 number of CP 443-1 and 2 number of CP 1623 only. How to achieve the redundancy between 4 numbers of CP 443-1 and 2 number of CP 1623?

Please refer the attachment for the network configuration. 

Hello Saravana kumar

you have to work with S7 Redconnect:

http://support.automation.siemens.com/WW/view/en/16667714

or an older one, Im Not sure if it s fits to you r usecase:

https://support.industry.siemens.com/cs/ww/en/view/2361347

Bye Murof

Hello Saravana kumar,

while setting up the fault tolerant connection you can tick the checkbox "4 way redundancy" in the settings of the connection.

Regards
Myst