I have a doubt regarding how a redundant module bus with TB840 and TB825 works. I have a module bus network as shown in the attachment. Let's say the module bus is working fine with Primary controller. Now to check module bus redundancy, I opened the POF loop from TB840. The redundancy worked fine and the complete module bus shifted to the Secondary controller. But what I have observed was Primary controller became faulty and shows the LED "F" as red blinking. In order to clear the fault, we had to restart the controller.
I would like to know, is it normal for a controller to go into fault mode after module bus changeover or I am doing something wrong.
Any module bus fault controller will go to fault mode ( If you are running in redundant mode) - This is as per product design. Then you need to restart the controller which is in error mode , both controller need to get all clusters otherwise controller will go to fault model.