MESA 7i92 + 7i77

Hello, 

we often used MESA 5i25 + 7i77ISOL + 7i77 cards for retrofit with analog servos. Now i plan to change 5i25 to ethernet version 7i92 card. 
My question is:
should i use 7i77ISOL with ethernet card too, or ISOL card is just for 5i25 cards? 7i92 Ethernet card is galvanically isolated from 7i77?

Thanks, 
Attila. 
 

The 7I77ISOL is probably not necessary with a 7I92 system because:

1. The 7I92 reference ground can be very close to the drives
2. The 7I92 is galvanically isolated from the Ethernet/connected PC

The 7I92 5V supply should be close to 7I92 (in the drive cabinet)
and have a floating output (so there is a single point ground)