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Connecting a CompactLogix PLC to a WebPort Using Serial Communications

You can connect a CompactLogix PLC to a WebPort via serial communications. 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 1769-UM01G-EN-P - November 2009 to 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 one end of a straight-through Ethernet cable to Serial Port 1 or Serial Port 2 on the WebPort. Connect the other end to a user-supplied RJ-45-to-9-pin converter. This is a picture of the dialog.
  2. Connect one end of the Allen-Bradley serial programming cable, catalog number 1747-CP3 or 1756-CP3 to the user-supplied RJ-45-to-9-pin converter.
  3. Connect the other end of the Allen-Bradley serial programming cable to the 1769-L35E controller.
  4. If you prefer to create your own cable, using the following cable wiring diagram: This is a picture of the dialog.
  5. Connect your personal computer to one of the LAN ports on the WebPort with a straight-through Ethernet cable (see image above).
  6. Log onto your WebPort. If you need additional help accessing your WebPort, see Logging onto the WebPort User Interface
  7. Access Configure:Serial Communications Setup. See Configuring Serial Communications Setup
  8. Select the 19200 Baud Rate. All other default settings remain the same.
  9. Click Submit. The software retrieves the data, and informs you when the data is successfully modified. To continue, click OK.
  10. Next, add the PLC to the Devices list on the WebPort. See Adding Devices. Settings for a CompactLogix PLC are Serial Port, DF1-CIP Protocol, 1 Slave ID, and CRC Checksum.
  11. 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.
  12. 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. (The PN is provided at the start of this topic.)
  13. Next, if required, add pass-through settings. Return to the Configure:Serial Communications Setup. See Configuring Serial Communications Setup.
  14. From the dialog, click the Pass-thru enabled checkbox. Settings for a CompactLogix PLC are DF1-CIP Protocol, 1 Slave ID, if that is the correct value, and CRC Checksum.
  15. Next, click Submit. The software confirms the data modification is successful. Click OK.

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