We can use network area 10-19 for DCS control network ?
As mentioned in the RNRP recommended IP address Plan,We reserved / used the network area 1-9 for the client server network & 20-31 for the control network.
Now We need to additional network area for expanding the network, so can we use network area 10-19 for the DCS control network ? (Which is not mentioned in the Recommended IP address Plan.)
Thanks & Regards.
Implicit Address mode (when area number is lifted from 5 bits of the third byte in the IP-address) supports area 0-31.
Explicit Address mode (when area number is manually entered in RNRP Wizard) supports area 0-63.
You can mix implicit and explicit mode as you like (the former is just less work intensive since you "parameterise the whole thing" just by setting an IP-address, no matter if its a PC, AC 800M or NE87x router).
Each area (/22 subnet) can hold 1023 nodes where RNRP can be used on the lower 500 (the higher part can be set aside for other node types, e.g. switches, printers, NAS drives, infrastructure, etc.). I.e. a single RNRP area can still hold a very large system with many nodes.
However, for robustness and reliability, it is recommended to split up large number of nodes in to smaller segments (areas). These segments need to be joined by RNRP router nodes (a PC with two network cards or an ABB NE87x RNRP router hardware). RNRP can be tunneled over L3, e.g. a WAN if you need to join two physically separated locations having no LAN / fibers between. RNRP tunnel traffic should be protected when emitted over public or unsafe networks, e.g. by configuring a VPN.
The default of using area 1 for client server and area 20 for controllers is just a "basic recommendation" you do not need to heed.
Better select something you feel comfortable with - including the service team, etc. There is a lot to gain by using an IP-scheme many know by heart; domain controllers are nodes 1 and 2, aspect servers 11, 12, 13, connectivity servers 21, 21, ... application servers next, clients start at 71, etc. etc.