https://support.industry.siemens.com/cs/mdm/109751316?c=101331922315&lc=en-WW

using the BOP-2, this shows how to transfer data from the old Cu to the new one. 

ndragan

I have control unit CU230P-2 DP 6SL3243-0BB30-1PA1 ver.A03-V04.30.29, PM240 6SL3224-0BE25-5AA0 and IOP 6SL3255-0AA00-4JA0. How control unit CU230P-2 DP replace with new control unit CU230P-2 DP 6SL3243-0BB30-1PA3 V4.7 SP10 HF3?

 You have many options to transfer:

1.COPY from OLD CU to BOP then COPY from BOP to New CU

2. Copy from old cu to MMC then Copy from MMC to New CU

3. Upload the project by Scout / Starter then Download to New CU.