---
title: "Direct Scan Class"
---

# Direct Scan Class

> <IUCard title="Direct Scan Class" link="https://www.inductiveuniversity.com/video/direct-scan-class/7.9" /><br />

The Direct scan class executes at a fixed rate, which is defined by the slow polling rate setting. Every Tag that uses the Direct scan class will poll the PLC at the Slow Rate setting at all times (24x7x365).

Ignition comes with two default Direct scan classes called **Default** and **Default Historical**. You can use any Tags in your system, including multiple Tags, for creating a Direct scan class. 

## To Add a Direct Scan Class

1. Open the **Designer**, in the **Tag Browser**, click on the **Timer** (![" "](<direct-scan-class/1-Scan Class Icon 2.png>)) icon to open the **Scan Class Editor**.

    ![" "](<direct-scan-class/2-Scan Class Icon 3.png>)

    On the left side of the window, you can see the default scan classes: **Default** and **Default Historical**. They are both Direct scan classes. The **Default** scan class polls at a slow rate of 1 second, and **Default Historical** polls at a 10 second rate.

    ![" "](<direct-scan-class/3-Direct Scan Class.png>)
 
2. To create a new scan class, click the **green +** icon on the bottom-left of the window.

3. Enter the name of your new scan class: **Direct 5 Second**.

    - From the **Mode** dropdown, select **Direct**.
    - Set the **Slow Rate (ms)** to the number of milliseconds you want to poll at. This example sets the slow rate at **5,000** ms or 5 seconds.
    - Click **OK**.

    ![" "](<direct-scan-class/4-Direct 5 Second Scan Class.png>)

4. Once you have your Direct scan class created, let's add multiple Tags to this scan class.

    Go to your **Tag Browser**, find some Tags you want to add to the scan class. This example uses several Ramp Tags.

    Right click on the selected Tags, and click on **Edit tag(s)**.

    ![" "](<direct-scan-class/5-Tag Browser.png>)

5. This opens the **Tag Editor** window. Select the **Direct** scan class from the dropdown, and click **OK**. 

    ![" "](<direct-scan-class/6-Add Direct Scan Class to Tags.png>)

You created a new Direct scan class and added your Tags. Just make sure you want to poll those values all the time (24/7) when you use a Direct scan class.