IP Addresses for M580 HSBY

[gretarmark_]

I am programming M580 HSBY redundant system at my job. I need to ask my customer to give me fixed IP address list for the system.

I have two racks that includes

• PLC 4 slots Ethernet Backplane
• X80 DC Power Supply 24VDC, 17W
• BMEH582040: M580 CPU redundant level 2 with remote and distributed I/O
• BMENOC0321: M580 I/O scanner module, IP forwarding, Ethernet I/P & Modbus TCP, 3 ports - coated

as shown in the images below:

In the next image, there are two 12 slot backplanes that includes 

• PLC 12 slots ethernet backplane
• X80 DC Power Supply 24VDC, 32W
• BMECRA31210: X80 performance ethernet drop adapter, ethernet backpane
• BMENOS0300: X80 Switch Module, 3 ports
• Then there is 1 DDO unit, 2 DDI units, and 4 AMI units

Next figure is from the manual and shows how the system will be connected, and there will be two frequency controllers connected to eNOS300 in rack 1 and other two to eNOS300 in rack 2.

My question is:

As I understand it, the system will need four IP addresses. Three of them I will need to ask my customer for,

• Main IP Address
• IP Address A
• IP Address B
• The fourth one is created by the Control Expert software, with +1 added to Main IP Address

Do I need more IP addresses, e.g. for eCRA312 and eNOS0300 or should four IP Addresses be enough?

P.s. I have IP Addresses for each frequency converter.

Best regards,
Grétar Már

[JerryBartlemay · Accepted solution]

Hello Grétar,

There are two IP domains here, one on the plant side and one on the CPU/RIO side.  They are divided by the BMENOC0321.  

If IP forwarding is used, and I assume it is, the IP address of the two NOC modules on the plant side belong to the plant subnet.  Those two IP addresses need to be consecutive, i.e. a.b.c.d and a.b.c.(d+1).  

On the CPU/RIO side, this network is connected to the NOCs on the backplane port.  Your client would provide you with a subnet to pull your addresses from.  This IP subnet is different than the IP subnet of the plant network.  

The devices on this subnet would include the CPU, CRA modules, and any DIO devices you have such as VFDs.  The NOS modules are switches and do not occupy an IP address.

In your case, the CPU uses four, each CRA uses one, and each VFD uses one.  This would be a total of ten IP addresses on the RIO subnet.

That would mean you need a total of twelve IP addresses from your client in two different subnets.

Now, if you are not using IP forwarding and keeping the NOC's backplane port in its default disabled state, and not giving the plant network access to the RIO network as a result, all  you need from the client are the two NOC IP addresses on the plant network IP subnet.  You can use the default private IP address subnet for the RIO network, and let it auto-assign the IP addresses.

[gretarmark_]

Thank you Jerry, this solved my problem! I actually did a little bit of changes, I moved the eNOS units (the switches) up to the CPU backplane and I only have eCRA on the 12 slot backplane.