Hi,

Yes, I have added the "LOGO! 8.4 Slave".
I have selected in the screenshot attached.

I have added the 2 slaves and then I have moved everything from the old OBA7 slaves to the new ones. Then I have deleted the old OBA7 slaves.

You can see the "Device type" is set to "LOGO! 8.4 Slave" when you open the properties of a Network Input.

So that should be okay I guess.

Maybe I have something new.

When I go to the displays of the PLC, I see two "errors" when I go to Diagnostics -> Software -> Data Connection

On Master I get this message:

01. S7 Client State: Disconnected
Rem. IP: 192.168.001.102 (102 is the second Slave)

On the 2 slaves I get this message:

01. Slave server State: Disconnected
Rem. IP: 000.000.000.000

Can this be a wiring issue ?

Hi,

But previously with my 0BA7 blocks, it was configured exactly the same and it worked.

The reason why I use master/slave is in my mind it was like this:
- 1 master that will have the configuration / diagram
- 2 slaves will just listen to that master
- I only need to update the master since the slaves will listen to the master

I needed extra I's and Q's and that's how we did it many years ago. I don't know if this was the best solution.

But to comprehend your suggestion.
You would change the master / slave into a master / master solution. So all would be a master? Now I have only 1 diagram built into the current master. I find this easier as it is all visible straight away. But then I would need to slice the diagram into pieces I think? So every master would have his own diagram?

Thank you

I forgot one thing. If I read your answer correctly, my 2 slaves don't work because my master is giving that S7 Client Disconnected error? Is that correct?

But my master is working correctly, as all lights connected to it works as expected. I don't know why he gives this message. I toggled the Checkbox "Allow S7 access" in the offline settings. Actually, I also checked the "Modbus access" to be sure. As you can see in attached screenshot.

Ok I'll think about that. Thanks for the input.

But I would rather try to fix that S7 problem. Then everything should work as before I think.
I don't know where that S7 problem is coming from. I also don't know how to debug this.

If I still have this problem tonight, I will try the master / master solution.