> For the complete documentation index, see [llms.txt](https://docs.irs.systems/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.irs.systems/ltt/documentation/ltt-gui-manual/lttgui/dialogs/f10testparameterconfiguration/operationmodeparameters.md).

# Operation Mode Parameters

You can change **operation mode parameter** values in the operation mode parameters section of the F10 dialog. There is a tab for each operation mode defined in your testplan.

{% hint style="info" %}
You need to load your [testplan](/ltt/documentation/ltt-gui-manual/teststand.md) before you can see and change operation mode parameters.
{% endhint %}

The operation mode parameters are [defined in your testplan](/ltt/documentation/ltt-gui-manual/teststand/operationmodes.md), so you cannot add or remove parameters here. In this dialog you only change the current values of those operation mode parameters.

{% hint style="info" %}
You can update operation mode parameters even if if testplan is already running.
{% endhint %}

![Operation Mode Parameter Compare](/files/aGfdZloMMEJp0bZidSSS)

[go to initial setup guide](/ltt/documentation/ltt-gui-manual/gettingstarted/initial-setup-guide.md#SETUP_GUIDE)


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