I found IC-3120 do not support TSN，so i wonder if it support EtherCat.
Here you can see all devices supported by NI for EtherCAT. It isn't listed there, though IC-3171, IC-3172, IC-3173 are currently supported.
So, the answer is NO, NI doesn't support IC-3120 EtherCAT.
This works really well for us, thank you! Facing same issue here. Help is appreciated.
Thank you for your replay. I get a IC3120 and test it, it support EtherCat. I think NI forget add it.