Methods for IP Addressing
Original instructions
About us
Addressing Methods
The Modicon M340 modules and CPUs with Ethernet functionality can have their addresses set through the rotary switches, the Control Expert IP Configuration tab, and combinations of the two:
Address Method
Description
STORED
The lower rotary switch is set to STORED (manufacturer default setting), and the module uses the application’s configured parameters.
device name (over DHCP)
There are two components of the device name:
  • default device name of the module:
    • BMX_2020_xxy (BMX P34 2020 CPU)
    • BMX_2030_xxy (BMX P34 2030/20302 CPU)
    • BMX_0100_xxy (BMX NOE 0100 and BMX PRA 0100 modules)
    • BMX_0110_xxy (BMX NOE 0110 module)
  • numeric value between 00 and 159 set on the rotary switches
(For the default device name, xx is the value of the upper rotary switch and y is the value of the lower rotary switch.)
Example: For a BMX NOE 0100 module, values of 120 (12 x 10) and 6 (6 x 1) on the respective upper and lower rotary switches indicate a value of 126. The value is appended to the default device name (BMX_0100_xxy) to create the valid DHCP device name of BMX_0100_126.
CLEAR IP
The lower rotary switch is set to CLEAR IP, and the module uses its MAC-based default IP address.
BOOTP
Set the lower rotary switch to one of its BOOTP positions to get an address over BOOTP (see note).
Note: To configure the module in the application to get its address from a BOOTP server, see "from a server," below.
from a server (STORED)
A server-assigned IP address can then be obtained from either a BOOTP or DHCP server.
BOOTP:
  • Set the lower rotary switch to one of its STORED positions.
  • Select From a server on the IP Configuration tab.
  • Leave the Device Name field empty.
DHCP:
  • Set the lower rotary switch to one of its STORED positions.
  • Select From a server on the IP Configuration tab.
  • Enter a valid device name in the Device Name field.
Note: The M340 Ethernet modules will not receive an IP address from a BOOTP/DHCP server on application download if the IP configuration has not changed.
disabled
Communications are disabled.
Note: An error can occur when the assigned address is a mismatch for the address in the application. Details of these errors are at Ethernet Port Status.