# Operation Mode Mappings
You can add an **operation mode mapping** by pressing the button in the operation mode mapping section of the F10 dialog.
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You need a password to add or remove operation mode mappings. Ask IRS for the password.
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You need to load your [testplan](/ltt/documentation/ltt-gui-manual/teststand.md) before you can map to [operation modes](/ltt/documentation/ltt-gui-manual/teststand/operationmodes.md) of that testplan.
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Each operation mode mapping consists of **1 to 8 round TCC input indicators** and a **drop down box**. The TCC input indicators represent the value of the [TCC hardware](/ltt/documentation/ltt-gui-manual/lttgui/hwcontrol/tcc-control-gui.md) (or the simulated one).
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The displayed **TCC input indicators** for each group are determined by the TCC mask, which is defined in the [project wizard](/ltt/documentation/ltt-gui-manual/lttgui/dialogs/f3projectwizard/testgroupsconfiguration.md). If you move your mouse cursor over such an indicator, a tooltip appears, showing the TCC indicator index. The index goes from 1 to 8 (left to right).
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In the drop down box you can select an operation mode sequence from the currently loaded testplan. You can add as many operation mode sequences as you want and select a corresponding **TCC input pattern** (like binary). You even can have multiple TCC patterns map to the same OM sequence. You should avoid, however, using the same TCC pattern for more than one OM.
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With an operation mode mapping, you **map** a certain **TCC input pattern** to a single **operation mode sequence** of your testplan.
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Once you have configured your TCC operation mode mappings you can run your testplan and it will execute that operation mode sequence, which is configured for the current TCC value.
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You can see the currently mapped operation mode in the main window's [group display](/ltt/documentation/ltt-gui-manual/lttgui/mainwindow/groupdisplay.md). If this display is empty, no valid mapping exists for the current TCC value and the testplan will execute a fallback sequence.
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The main window will display a warning message if there is no valid operation mode mapping at all and you are not allowed to start the loaded testplan.
This can happen if you
* have not configured any mapping yet
* changed the name of the operation mode sequence or deleted the sequence
[go to initial setup guide](/ltt/documentation/ltt-gui-manual/gettingstarted/initial-setup-guide.md#SETUP_GUIDE)
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