Hello 

I want to know , the firmware of CPUs in redundancy mode must be same? 

I have 2 cpus that are in redundancy , model :414-4HM14-0AB0

Now , one of them is faulty and must be change .

If I buy same cpu in case of model but not firmware , and replace it by faulty one , will be any problem ?

My system works ? 

Thanks

If the two cpus have different firmware, the partner cpu will not start up and there will be a message in the diagnose buffer that there is a difference between the cpus.

You will need to downgrade the new or upgrade the old.

...sent from App

Hello 

What you mean about partner cpu ? You mean that the new cpu ? 

Let me explain more, The left cpu (in the pictire attached) needs to be changed .

How can I downgrade or upgrade the firmware ? How can I get the apprpriate firmware ? 

I'm not very professional in this regard ,so Let me know the steps .

Thanks 

Hi,

Partner cpu = the other cpu

The firmware downloads for the 6ES7 414-4HM14-0AB0 can be found here:
https://support.industry.siemens.com/cs/ww/en/view/109474703

The procedure for how to replace a defect partner cpu that you receive with newer firmware and how you should downgrade the new cpu is also described on the download page.

Description of replacement scenario

Both CPUs must have the same firmware version in an S7-400H. If one CPU of your S7-400H fails, order a new CPU with the same order number. It will be delivered with the latest firmware version. This firmware version may be higher than the firmware version of the CPU being replaced. In this case, you must downgrade the new CPU to the older firmware version.

You have two options for the downgrade:
1.using the memory card
(see description …..)

2.using the online functionality as described below:

Add the new CPU to your automation system.
Do not connect the fiber-optic cables yet.
Select this CPU in HW Config or in SIMATIC Manager.
Execute the menu command "PLC > Update firmware". The "Update firmware" dialog box opens. Here you select the firmware file with the same version as that of the previous CPU.
Upload this file to the CPU. The new CPU now has the same firmware version as the one it replaces.
Now connect the fiber-optic cables.
Transfer the system to the Redundant operating state by starting the CPU.