GE Comm Req

I have about 30 registers I would like to move over to another PLC via a COMM REQ.

They are not in any specific order, however, they are all between %R1 and %R800.

Can I use 1 COMM REQ to move %R1-%R800 therefore getting 770 registers of 0 and the 30 I am looking for?

If you're planning to use a COMMREQ to set up an Ethernet channel you can transfer a maximum of 1024 words. As far as I know, none of the available serial protocols permit that many registers in a single transaction. The maximum is 500 words when using SNPX serial. Modbus RTU and CCM are even more limited.
However, if you're going to use Ethernet and both PLCs support it, you should consider configuring Ethernet global data (EGD). That way you won't need the COMMREQ.

Thanks.

It is ENET so just out of curiosity is there a limit on EGD?

As far as I know, the only limits are the address range of the memory types. Don't include %AI1025 in the produced or consumed transaction if you've only configured a length of 1024 for %AI memory.