Can we put AC800M PM866 and ABB,PM802F on same control network or diff control network.
Yes, you can.
Freelance system default network is 172.16.1.x/255.255.240.0. There is rotary switch on E1/E2 slot card (Ethernet card) if it is other than 0 then it's using default IP addressing. And there user can configure 172.16.1.1 ...15(F) addresses.
using diagnostic cable TK890F/891F you configure special IP address other than default. Both Ip address and subnet can be set as required.
In case of redundant controller rotary switch settings are different.
Note that on default network/subnet, Freelance system get synchronized if timesynch is enabled.
Recommended to read through AC 800F M&I manual. for latest version 2013 doc id is 3BDD012501.
hope that helps.