> 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/configuration/moduleconfiguration/ps.md).

# PS Module

All power supply (PS) modules have the following mandatory standard parameters:

| Parameter      | Meaning                                                                                                                                                                                                                                                                                                                        | Examples                                                       |
| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | -------------------------------------------------------------- |
| Resource       | The connection information needed to connect to this device. Depending on the type of device this can be a COM port, a GPIB address, an IP address or something else. Most drivers are based on VISA, which brings its own syntax to provide a GPIB or IP address. The VISA resource names can usually be looked up in NI Max. | <p>COM1<br>GPIB0::1::INSTR<br>TCPIP::192.168.222.50::INSTR</p> |
| NominalVoltage | The initial voltage which should be set during device initialization.                                                                                                                                                                                                                                                          | 12.0                                                           |
| MinVoltage     | The lower voltage limit in V. This value can be changed through the [LTT GUI](/ltt/documentation/ltt-gui-manual/lttgui/dialogs/f10testparameterconfiguration.md). The GUI will stop all running tests if this limit will be violated.                                                                                          | 0                                                              |
| MaxVoltage     | The upper voltage limit in V. This value can be changed through the [LTT GUI](/ltt/documentation/ltt-gui-manual/lttgui/dialogs/f10testparameterconfiguration.md). The GUI will stop all running tests if this limit will be violated.                                                                                          | 19.0                                                           |
| CurrentLimit   | The max. current the power supply will regulate to in current mode (CC). This value can be changed through the [LTT GUI](/ltt/documentation/ltt-gui-manual/lttgui/dialogs/f10testparameterconfiguration.md). If the actual load is greater than this current the voltage will drop, leading to malfunctions.                   | 100                                                            |

Depending on the specific PS module, there might be additional parameters, which are described [here](/ltt/documentation/ltt-gui-manual/configuration/moduleconfiguration/ps/ps-parameters.md).

Per default a power supply configured here is controlled by the underlying LTT software layer. This means the PS is **automatically initialized and configured to the provided parameters**. Nevertheless, in your [testplan](/ltt/documentation/ltt-gui-manual/teststand.md) you can still change voltage and/or current during runtime, as well as access the latest values read from that PS (see [here](/ltt/documentation/ltt-gui-manual/teststand/hardware-control.md)). But you have **no control** over when the PS is initialized/closed and when the output is turned on/off.

## TestStand-only control

There are situations in which you might need **more control over your power supply** from within TestStand. For such situations you can provide the `tsonly="true"` attribute to the `Module` node.

```xml
<Module name="PS1" tsonly="true">
...
</Module>
```

If you do so, **you are in charge** of initializing, setting and closing the power supply properly. [Read here to learn how to do](/ltt/documentation/ltt-gui-manual/teststand/hardware-control.md).

{% hint style="info" %}
You can access the PS control panel through [GUI](/ltt/documentation/ltt-gui-manual/lttgui/hwcontrol/ps-control-gui.md) and also via [TestStand](/ltt/documentation/ltt-gui-manual/teststand/hardware-control.md). However, the control panel is not available for self-controlled (`tsonly="true"`) power supplies.
{% endhint %}


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