---
title: "Connecting to CompactLogix"
---

# Connecting to CompactLogix

> :::note
> This driver supports CompactLogix firmware up to version 20.18.
> :::

## Connect to a CompactLogix Device

This driver requires the OPC UA module to be installed and enabled. If the module is missing or disabled, the device will fault with a “Missing Dependency” error on the **Platform** **System** > **Modules** page.

1. On the Gateway, go to **Connections** > **Devices** > **Connections**.

    ![](../../devices-connections.png)

2. Click **Create Device Connection +**.

3. Select **Allen-Bradley CompactLogix (Legacy)** from the list and click **Next**.

    ![](select-compactlogix.png)

4. On the **Configure Device** screen, enter the required fields:

   * **Name**: The desired name for the device (e.g., CompactLogix)
   * **Hostname**: The IP address of the PLC (e.g., 10.20.4.55)

   ![](compactlogix-settings.png)

5. Click **Create Device Connection**.

The device will be listed now on the Connections page. The status will initially show Disconnected, but will move to a Connected state.

![](compactlogix-connected.png)

## Device Connection Settings

### General

| Name | Description |
|------|-------------|
| Name | A user-defined name for the device. This name appears in OPC item paths and the Devices list. Name must begin with an underscore or a letter, and cannot include special characters. |
| Description | An optional description for the device. |
| Enabled | Enables or disables the device connection. Only enabled devices are accessible in the system. |

### Connectivity

| Name | Description |
|------|-------------|
| Hostname | IP address of the target device or Ethernet module (such as ENBT or EN2T). |
| Local Address | IP address of the local interface to use when connecting. Leave blank to auto-select. |
| Timeout | Connection timeout in milliseconds. |
| Connection Path | Used to define the route to the processor. The Connection Path format contains four comma separated numbers. The first number is always 1 and tells the Ethernet module to route through the backplane. The rest of the numbers vary by device type. See [Allen-Bradley Connection Paths](../allen-bradley-ethernet.md#allen-bradley-connection-paths) for more information. |

### Advanced

| Name | Description |
|------|-------------|
| Disable Automatic Browse | Disables automatic browsing of the tag structure. |
| Show String Arrays | Enables visibility of string arrays in the address space. |
| Status Request Poll Rate | Interval in milliseconds for polling the device status. |
| Max Concurrent Requests | Number of simultaneous requests allowed. Larger values may improve performance but can overwhelm the device. |