Simatic Wincc Redundancy

Hi,

Got some issue with our redundant servers and hopefully guys you can assist me on resolving this.

We have two servers that are fully redundant, Server A is the master and Server B is standby. I have downloaded the entire project to Server B, And everything was completed. When Server B is synchronizing with Server A, the connection of our client was interrupted for some unknown reason. Therefore , I am force to re-start server A hoping that the redundancy will work and all client station will switch to Server B. Everything went fine and working.

When server A restarted. I downloaded the entire project to Server A and started the runtime. Again, everything went fine.

My problem now is that I want to put server A to master since this is our original configuration of the system. Unfortunately when I am trying to deactivate Server B runtime I got a pop-up message as follows:

"The partner server cannot assume the function of the local server. If you disable the local server, this redundant operator control and monitoring server system will no longer be available. Do you want to continue?"

This is the first time I seen this pop-up message and I'm worried if I continue with this our client will loose connection again with the server.

Kindly help me please in solving this issue. I''ve check the status of redundancy for both server and I enclosed herewith as an attachment.

Kind regards,

Hi,

Thank you for your response.

I will try to check the log files tommorow. For the meantime I notice I have an alarm in our client station that maybe related to my issues. There is an alarm in the process REDRT:OSSVRA: Partner Station Failed.

But I don't understand why it has this message since both servers are running properly. I also checked the internal tag for redundancy and they seems to be all fine.as shown in my attachment.

Thats why I am planning to push through by deactivating the RT on Server B and see what will happens.

REgards,

Hi,

Can you let me know which diagnose log file I have to check regarding with redundancy?

REgards,

Dear PCS 7, 

Let me give some inputs as well, 

It seems like the OS A and OS B are conflicting with each other. Can you also check the below items?

1. The Time Synchronization between both station, make sure they are synchronized. 

2. The Netpro connection name, make sure they are the same. 

3. The ethernet (terminal bus) and serial link (redundancy link) are connected without issue. 

4. The redundancy setting is configured correctly, (Sync through Serial COM port) 

5. The Simatic Shell redundancy is configured correctly.

6. The user right is okay, able to access each other station and folders without the need to key in a password. 

Hope it helps. 

Hi,

Thank you for your inputs. Please find below my answer:

Dear PCS 7,

Let me give some inputs as well,

It seems like the OS A and OS B are conflicting with each other. Can you also check the below items?

1. The Time Synchronization between both station, make sure they are synchronized.

( Yes they are synchronize)

2. The Netpro connection name, make sure they are the same.

(Yes they are the same, and there no changes done on the netpro prior to this issue)

3. The ethernet (terminal bus) and serial link (redundancy link) are connected without issue.

(Yes they are connected without issue)

4. The redundancy setting is configured correctly, (Sync through Serial COM port)

(Yes)

5. The Simatic Shell redundancy is configured correctly.

(Yes)

6. The user right is okay, able to access each other station and folders without the need to key in a password.

(Yes, both server can access each other files)

Still now don't know if I have to go in deactivating Server B to check if redundancy is working. I tried changing the preffered server of one of my clients to Server A so in case redundancy doesn't work one of the clients still connected to a running runtime if what I'm planning is correct?

Hope it helps

Hi,

I'm try checking winCC_sys_02 of both servers, honestly I don't know what to look for. 

I attached herewith the diagnostic logs for both servers and hope you can help in interpreting the logs.

REgards,

Hi George,

Thank for all your support.

I have atttached herewith the SIMATIC_S7_Protocol_Suite_01 log for Server A. I notice the message "Redundancy error: Connection "RTU_AS" is not redundant!" .

Can you help me how can I rectify this error. We have 2 PLC AS1 and RTU_AS. It seems that the connection on RTU_AS is not redundant.

REgards,