Redundancy with two different type of CPU

Hello Mahesh N;

A manual on software redundancy has been suggested to you earlier.

I suggest you start by opening and reading it:

4.1 How does a system with software redundancy work?

Definition

A system with software redundancy is characterized by:

● Two S7-300 and/or S7-400 stations that are linked via bus system.

● A redundant user program that is loaded on both stations.

● Two DP master systems to which ET 200M distributed I/O devices with a redundant DP slave interface module such as the IM 153-2 are connected.

● Integration of the blocks provided in the "Software redundancy" package

So yes, a mixture of S7-300 and S7-400 CPUs is al;lowed with Software Redundancy.

Hope this helps,

Daniel Chartier