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Using Rockwell BootP and EtherNet/IP Commissioning Tool

Allen-Bradley, Networking, Rockwell Software

In industrial automation, configuring network communication for Allen-Bradley Ethernet modules is a crucial step in setting up a ControlLogix, CompactLogix, or other Rockwell-based PLC system. One of the primary tools for assigning an initial IP address to these modules has traditionally been the BootP-DHCP Server Utility, a free software provided by Rockwell Automation.

However, Rockwell has introduced a newer tool, the EtherNet/IP Commissioning Tool, which offers a more streamlined approach to assigning IP addresses.

This guide will take you through the process of using Allen-Bradley BootP and the EtherNet/IP Commissioning Tool to configure an Ethernet module, covering both methods so you can choose the best option for your setup. Whether you’re working with a 1756-EN2T, 1769-AENTR, 1734-AENT, or similar module, this step-by-step guide will help you get connected efficiently.

BootP, DHCP, and the EtherNet/IP Commissioning Tool

What is BootP?

Bootstrap Protocol (BootP) is a network protocol used to automatically assign an IP address to a device based on its MAC address. Unlike Dynamic Host Configuration Protocol (DHCP), which dynamically assigns addresses, BootP is used to assign a static IP address permanently.

Why Do Allen-Bradley Ethernet Modules Use BootP?

Many Allen-Bradley Ethernet modules ship without a pre-configured IP address. Instead, they rely on BootP to obtain their initial address. Once assigned, the user can disable BootP and configure the module with a static IP.

Introducing the EtherNet/IP Commissioning Tool

Rockwell Ethernet/IP Address Commissioning Tool

Rockwell Automation’s EtherNet/IP Commissioning Tool is a more modern alternative to BootP for assigning IP addresses to Ethernet modules. It offers a graphical interface and eliminates the need to configure BootP settings manually.

Key Advantages Over BootP:

  • No need for a separate DHCP server.
  • Easier device discovery and assignment.
  • Better diagnostics and troubleshooting tools.
  • Direct integration with Studio 5000 Logix Designer.

BootP vs. DHCP vs. EtherNet/IP Commissioning Tool for Industrial Automation

  • BootP: Used for assigning a fixed IP address during initial configuration.
  • DHCP: Assigns dynamic IP addresses but can cause network issues if an address changes unexpectedly.
  • EtherNet/IP Commissioning Tool: A modern alternative to BootP with easier setup and built-in diagnostics.
  • Static IP: Ideal for industrial networks to ensure stable communication between PLCs, HMIs, and SCADA systems.

Configuring an Ethernet Module Using the EtherNet/IP Commissioning Tool

Required Tools

Before configuring your Allen-Bradley Ethernet module, ensure you have the following:

  • PC with EtherNet/IP Commissioning Tool.
  • Ethernet cable (direct connection or via a managed switch).
  • Allen-Bradley Ethernet module (e.g., 1756-EN2T, 1769-AENTR, etc.).
  • RSLinx Classic or FactoryTalk Linx for verification.

Steps to Assign an IP Address Using EtherNet/IP Commissioning Tool

  1. Download and install the EtherNet/IP Commissioning Tool from Rockwell’s website.
  2. Launch the tool and select the correct network adapter.
  3. Scan the network to detect unconfigured Ethernet modules.
  4. Select the module from the list and enter the desired static IP address.
  5. Click Assign and confirm the changes.
  6. Verify connectivity using the built-in ping test or RSLinx.

Configuring an Ethernet Module Using BootP

If you prefer to use BootP, follow these steps:

Step 1: Installing and Launching Rockwell BootP-DHCP Server

  1. Download BootP-DHCP Server from Rockwell Automation’s website.
  2. Install the software and launch it as an administrator.
  3. In the BootP utility, select your network adapter (ensure it matches your Ethernet module’s network).
  4. Open the log window to monitor incoming BootP requests.

Step 2: Assigning a Static IP Address

  • Connect the Ethernet module to your PC or network switch.
  • Power on the module; it will start broadcasting BootP requests.
  • In the BootP-DHCP Server log window, locate the MAC address of your module.
  • Click Add Relation, enter the MAC address, and assign an IP address.
  • Click OK to save the settings.
  • Verify connectivity via ping or RSLinx.

Disabling BootP on the Ethernet Module

Regardless of which method you used (BootP or EtherNet/IP Commissioning Tool), it’s important to disable BootP so the IP address remains static.

Method 1: Using RSLinx

  1. Open RSLinx Classic.
  2. Navigate to the EtherNet/IP driver and locate your module.
  3. Right-click the module and select Module Configuration.
  4. Under the Port Configuration tab, select Static and click Apply.
  5. Power cycle the module to confirm it retains its static IP.

Method 2: Using the Module’s Web Interface (if available)

  1. Open a web browser and enter the assigned IP address.
  2. Navigate to the network settings.
  3. Disable BootP and manually configure a static IP.
  4. Save the settings and reboot the module.

Conclusion

Both BootP-DHCP Server and EtherNet/IP Commissioning Tool are viable options for configuring an Allen-Bradley Ethernet module. The newer EtherNet/IP Commissioning Tool provides a more user-friendly and efficient way to assign static IP addresses, while BootP remains useful in legacy setups.

By mastering Allen-Bradley BootP and EtherNet/IP commissioning, you’ll improve your efficiency in commissioning and maintaining robust industrial networks.

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