IP Addressing Parameters
When a new 171 CBU 98090 or 171 CBU 98091 processor is shipped from the factory, it does not come with pre-configured IP address settings. IP address settings include:
IP address
subnet mask
default gateway
First Power-Up
When you first connect the processor to an Ethernet network and power it up, it transmits a request for IP address settings. The BOOTP request can be handled by either a BOOTP or a DHCP server.
If both of the following conditions exist, the server assigns the processor its IP address settings:
A BOOTP or DHCP server exists on the network.
The server is configured to recognize the processor by its MAC address.
If no BOOTP or DHCP server exists on your network – or the server is not configured to deliver IP address settings to the processor – the processor assigns itself a default IP address.
Deriving a Default IP Address from a MAC Address
The processor derives its default IP address from its factory-assigned MAC address. The MAC address for the processor is displayed on the front of the module.
The default address is in the format 10.10.x.y, where x and y are derived from the last 2 octets of the MAC address.
To determine the default IP address of a module, follow these steps:
Step |
Action |
|
|---|---|---|
1 |
Using a sample MAC address of 00-00-54-10-25-16, ignore the first 4 pairs (00-00-54-10). |
|
2 |
Convert the subsequent pairs (25 and 16) from hexadecimal to decimal format. |
25: (2 x 16) + 5 = 37 |
16: (1 x 16) + 6 = 22 |
||
3 |
Use the specified format (10.10.x.y.) to assemble the derived default IP address. |
The default IP address is: 10.10.37.22 |
Assigning New IP Address Settings
After first power-up, you can connect to the processor as follows:
via Ethernet using the default IP address
via USB using the fixed IP address 90.0.0.1
via the Modbus serial port
After a connection has been established, you can use Control Expert to transfer a configuration file to the processor, including new IP address settings.