Hi,

In my Working Plant CPU 417-5H PN/DP (6ES7417-4HT14-0AB0) Secondary PLC Faulty.

Primary PLC in Run mode (no issue)

So we planned to replace new plc during plant shutdown (downtime 3 hours)

i am already aware how to replace.

But Existing part number 6ES7417-4HT14-0AB0 has been obsoleted.

In siemens Market 6ES7 417-5HT06-0AB0 this latest part number only available.

So my Query is 

1. Can replace new version 6ES7 417-5HT06-0AB0 plc in only secondary PLC?

2. Or need to change both plc (Primary & Secondary PLC) with hardware configuration changes?

3. Any other caution required during replace both plc?

<<<<<<<<Siemens Adviced PDF Copy also attached>>>>>>

 Thank you in advance

Hello,

Mixing the new CPUs with the previous CPUs in one S7-400H system is not permitted, you can check out in the next FAQ: 

https://support.industry.siemens.com/cs/ww/en/view/59903098