---
title: "Connecting to MicroLogix"
---

# Connecting to MicroLogix

> <IUCard title="Connecting to MicroLogix" link="https://www.inductiveuniversity.com/video/connecting-to-micrologix/8.3" />
> <br/>

This driver supports:

* MicroLogix 1100 and 1400 direct over Ethernet/IP
* MicroLogix 1100 and 1400 through a 1761-NET-ENI Ethernet interface
* MicroLogix 1100 and 1400 through a Spectrum Controls WebPort 500

:::caution
MicroLogix 1200 and 1500 are not fully supported. These devices do not support tag browsing, so **Disable Processor Browse** must be enabled. Additionally, the MicroLogix driver does not support access to Input Parameters.
:::

## Connect to a MicroLogix 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 MicroLogix** and click **Next**.

    ![](select-micrologix.png)

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

   * **Name**: MicroLogix  
   * **Hostname**: The IP address of the device (e.g., 10.20.7.77)

   ![](micrologix-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.

![](micrologix-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 | Optional description to help identify the device. |
| Enabled | When selected, the device is active and available for use. |

### Connectivity

| Name | Description |
|------|-------------|
| Hostname | The Hostname value is the IP Address of the MicroLogix 1100 processor, MicroLogix 1400 processor or 1761-NET-ENI Ethernet interface. EthernetIP protocol on TCP port 44818 (0xAF12) is used to communicate to the listed devices. |
| Local Address | The local address to connect from when establishing a TCP connection. If left blank, then the driver will select an available address. |
| Timeout | The maximum amount of time to wait, in milliseconds, for responses from the processor. |
| Connection Path | The connection path to the processor. If specified, the slot number setting is ignored, so be sure to terminate the path with backplane and slot number. [Optional] **Note**: If a MicroLogix device becomes stuck in a Browse Pending state, try setting this property to `1,0` to force routing through backplane slot 0.|

### Advanced

| Name | Description |
|------|-------------|
| Disable Processor Browse | Disables processor browse setting. May be required for some MicroLogix 1200 or 1500 devices. |
| Zero TNS Connection | Disables the Zero TNS connection setting. |
| Browse Cache Timeout | The amount of time, in milliseconds, to cache tag structure results read from the device. |