S7400 On-Board IO to S7-1500 CPU

[MikeH 0]

Hi Guys,

I am working on a project where my Client is looking to upgrade a CPU 414-3 DP (S7-400) 6ES7 414-3XJ00-0AB0 to a newer supported model. 

The suggested replacement for this CPU is CPU 414-3 (6ES7414-3XM07-0AB0). 

We are looking down the avenue of potentially replacing the existing  CPU 414-3 DP with a S7-1500 CPU.

In the existing setup there is Remote IO and on Board IO. 

If we replace the existing CPU 414-3 DP with a S7-1500 CPU we will be able to communcate with the existing Remote IO via an ET 200M IM 153-1. No problem there, 

However, the problem we see is with the existing On-board IO.......... Does anyone out there know if there is a module that allows S7-400 On-board IO to communicate to a new S7-1500 CPU ? 

Thanks Guys 

[sigmadelta 5]

The only way I know if is to make the S7-400 CPU a Profibus Slave to the S7-1500.  The S7-400 would have to have a small program to transfer the I/O signals from the S7-1500 to the S7-400 I/O.

https://support.industry.siemens.com/cs/document/13091565/how-do-you-connect-an-s7-400-cpu-as-dp-slave-to-an-external-master-?dti=0&lc=en-PA