Unable to write to OPC tag

I am using SLC program from Ignition for simulation. I have created test tags and mapped them to N7/N7:0,1,2… I am able to read values from these tags but unable to write values and also communication is both read and write. Is there any setting that needs to be changed?

How are you trying to write to it? Are you writing through the tag browser or through a component? If though a component is Bidirectional enabled for the binding?

I tried to write through a component(multi state button) - bidirectional is enabled. This didn’t work. So, I have tried writing directly from tag browser and it didn’t work neither.