---
title: AB ControlLogix FreeTag (Gen1)
slug: bhdo-v3/ab-controllogix-freetag-gen1
createdAt: 2022-05-26T20:56:06.000Z
---

Review the following information for setting up and configuring the AB ControlLogix FreeTag (Gen1) driver. 

# Belden Horizon Data Operations Compatible Series

| Compatibility parameter      | Compatible items                                                                                                                                                                                                                     |
| ---------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| **Driver type**              | Serial                                                                                                                                                                                                                               |
| **Validated devices/series** | [ControlLogix](http://ab.rockwellautomation.com/)<br />When configuring tags for this driver, you must enter the case-sensitive register name exactly as it is defined in the PLC. See the *Free Tags* section below to learn more.  |

To set up and configure this device in Belden Horizon Data Operations, you will need to do the following:

- Step 1: Set up and Configure the PLC Device
- Step 2: Set up the PLC Device in Belden Horizon Data Operations DeviceHub
- Step 3: Configure the List of Registers

# Step 1: Set up and Configure the PLC Device

Record the serial communication parameters for the device. Otherwise, follow the steps below.&#x20;

**To configure your device:**

1. Note down the following information and refer to it as needed.&#x20;

   **Device**: AB ControlLogix FreeTag 1756-L55
   **Communication I/F**: RS232. Refer to the following figure.

   ![](https://api.archbee.com/api/optimize/SSUUxKZUk9bFTEPNn_6Zo/SSp4v8C87SjqfCgvoTLwD_ab-controllogix-freetag.png "AB ControlLogix FreeTag")
2. Launch RSLinx Classic, and then click **Configure Drivers**.
3. Add a new RS-232-DF1 driver.
4. Set up the communication port and set up parameters as follows, and then click **Auto-Configure**.

   ::Image[]{src="https://api.archbee.com/api/optimize/SSUUxKZUk9bFTEPNn_6Zo/tqIEohWhk6dy_BhOWLt9g_ab-controllogix-freetag-auto-configure482x338.png" size="80" width="482" height="338" caption="Configure parameters" position="center" showCaption="true"}
5. Right-click the Ethernet communication module and select **Module Configuration&#xA0;**&#x74;o set up its network parameters.

# Step 2: Set up the PLC Device in Belden Horizon Data Operations DeviceHub

Configure the following parameters when you [Connect a Device](docId\:T-cWPe0_Jsfw5-aoj8WPP) with this driver. Update default values to the specific setup of your device.&#x20;

| Parameter              | Value                             |
| ---------------------- | --------------------------------- |
| **Type**               | Allen-Bradley                     |
| **Driver**             | AB ControlLogix FreeTag (Gen1)    |
| **Data Bits**          | 8                                 |
| **Baud Rate**          | 19200                             |
| **Parity**             | Even, Odd, None                   |
| **Stop Bits**          | 1                                 |
| **Slot**               | 0                                 |
| **Communication Port** | Local Serial connection file path |

# Step 3: Configure the List of Registers

When you [Add Tags](docId\:Wpe2HMXelARLBnhWbuChY) to the connected device, refer to the following tag parameters and available value types.

Refer to the following additional resources:

- [Device and Tag Metadata Use Case](docId\:kR5ZcBhkXWK89Qti0v1t8)
- [Tag Formula Variables](docId:9m6xLAQ9IoPW5alpru96S)

## Free Tags

This driver doesn't have a list of available register names in the DeviceHub *Add Tag* form.

To add tags, you must enter the case-sensitive register name exactly as it is defined in the PLC.

A **Connected** status for the device won't display until a tag with a correct register name is created.

## Available Value Types

- `bool`
- `sint`
- `int`
- `bit(int)`
- `dint`
- `real`
- `lint`

## Tag Parameters

- **Name**: Enter the case-sensitive register name exactly as it is defined in the PLC.&#x20;
- **Value Type**: Select a data type from the drop-down list.&#x20;
- **Polling Interval**: Enter a value in seconds. This determines how often the tag should poll the register for data.
- **Tag Name**: Enter a name for the tag.
- **Description** (Optional): Enter a description for the tag. &#x20;
- **Tag Formula**: Enter a formula for the tag to process the generated data. Two variables are permitted: `value` (current tag value) and `timestamp` (current tag UNIX time in milliseconds). The following math functions are available:
  - sin
  - cos
  - sqrt
  - tan
  - power
  - log
  - exp
- **Only Publish on Change of Value**: Select the checkbox to customize NATS messages to be published only when the *value&#x20;*&#x70;arameter changes from a previous value to a new one. *Change of Value* only applies to boolean, numeric (such as int or float), and simple string data types. It does not apply to complex types, such as JSON or array. Poll-once topics will not be affected by *Change of Value* settings. These topics will still only see a single message.
- **Meta Data**: Metadata summarizes basic information about data. This feature allows you to define key-value pair data for the device output payload later on. It can then be used to find, use, and reuse particular instances of data.&#x20;