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Connecting a CompactLogix PLC to a WebPort Using Ethernet

You can connect a CompactLogix PLC to a WebPort using Ethernet. The example provided here uses Rockwell Automation's RSLinx and RSLogix software running on a personal computer. For this example, before you can make the connection, you must have:

  • RSLinx software installed and running on your personal computer.
  • RSLogix 5000 installed and running on your personal computer. This software is used to configure the controller.
  • Your PLC connected physically to the WebPort.
  • Your WebPort installed with power and network connections up and running.
  • Access to your WebPort via a web browser.

See also About Networking Deployments

The following example uses a CompactLogix (1769) L35E. In the following image, the WebPort is connected between the PLC and the personal computers. Use Publication 1768-um001_-en-pto physically install your PLC:

This is a picture of the dialog.

You connect the CompactLogix L35E 1769-L35E) to the WebPort as follows:

  1. Connect a straight-through Ethernet cable from the Ethernet port on your CompactLogix PLC to one of the available LAN ports on the WebPort: This is a picture of the dialog.


    If there are no available LAN ports on the WebPort, expand the number of LAN ports by connecting a  network switch. Do NOT use a hub.

  2. Connect your PC to the WebPort with a straight-through Ethernet cable as shown in the image above.
  3. Log onto your WebPort. If you need additional help accessing your WebPort, see Logging onto the WebPort User Interface
  4. Access Configure:Network Setup. See Configuring Network Settings for the WebPort
  5. 5. In the LAN Settings Section, enter the IP address, network mask, and gateway addresses that will allow the WebPort to access the controller.


    Under LAN settings, make sure that you have either Static or DHCP Server selected. If you selected Static, then you must have a means of manually applying an address to the device as the WebPort cannot allocate it. If you select DHCP Server, the PLC receives an address from the WebPort when you turn on power to the PLC. When you select DHCP Server, you may also need to reset your EtherNet/IP device to ensure that the PLC gets its new address from the WebPort on a timely basis.

  6. With the LAN settings as shown above, you can assign your PLC an IP address from to through are reserved for the LAN's DHCP server. The setting for the PLC is going to be in this example. If you do not know how to change a PLC's address, refer to your PLC documentation or review the following topic section on changing a PLC address:

    Connecting a PLC Running on a Virtual Machine to a WebPort

  7. Click Submit, the software retrieves the data, and informs you when the data is successfully modified. To continue, click OK.
  8. Next, add the PLC to the Devices list on the WebPort. See Adding Devices. Settings for a CompactLogix PLC are Ethernet Port, EtherNet/IP Protocol, PLC Address, and 0 Slot Number, or the specific applicable slot number: This is a picture of the dialog.
  9. Click Test Device Connection. If you have successfully connected to your PLC, the software confirms the connection is successful. Click OK. Next click Submit on the Device Properties dialog. The PLC appears on the Devices dialog. If you have difficulty connecting, see Troubleshooting LAN Connections
  10. If you need to know how to configure a CompactLogix PLC so that it is able to connect to the WebPort, use the manual provided with your PLC.