> For the complete documentation index, see [llms.txt](https://docs.voltmasters.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.voltmasters.io/device-integrations/energy-meters/siemens/siemens-pac.md).

# Siemens PAC energy meter

{% stepper %}
{% step %}

### Access the menu

To change the settings, navigate using the meter's display.

<figure><img src="/files/QCmaFPV31sInhmzuR2M4" alt=""><figcaption></figcaption></figure>

* Press the bottom button (F4) to open the main menu.
* Navigate to Settings.

<figure><img src="/files/86QPK7y5b623I3nJigh0" alt=""><figcaption></figcaption></figure>
{% endstep %}

{% step %}

### Configure network and communication

Use a stable network connection. A static IP address is recommended.

In the **Settings** menu, go to **Communication**.

<figure><img src="/files/FEXNqhviJ6WohGadLvLx" alt=""><figcaption></figcaption></figure>

* Select Modbus TCP.

<figure><img src="/files/c6qdJ3qRYKkziSGR9ROx" alt=""><figcaption></figcaption></figure>

* Choose Network Settings.
* IP Configuration:
  * Disable DHCP: Turn off DHCP to prevent the IP address from changing after a reboot (which would break the connection).
  * IP Address: Enter a unique, free IP address.
  * Subnet: Enter the correct subnet mask.
  * Gateway: Enter the correct gateway.

<figure><img src="/files/wj0Gi6bO2SIMXBFktjRt" alt=""><figcaption></figcaption></figure>
{% endstep %}

{% step %}

### Set current transformers

Configure the correct CT ratio. This is essential for accurate measurements and correct control.

* Return to the Settings menu.
* Select Basic Parameters.

<figure><img src="/files/CP4H8u1P1j26N0AEl93x" alt=""><figcaption></figcaption></figure>

* Choose Current Inputs.

<figure><img src="/files/c7x9fFsOEBz5BZ60NHTn" alt=""><figcaption></figcaption></figure>

* Configure Values:

  * Set the CT Primary and CT Secondary values.
  * These values must match the specifications found on the physical current transformers (e.g., 250A primary / 5A secondary).

  <mark style="color:$warning;">Warning: Incorrect values will lead to wrong measurements, causing the energy management system to malfunction.</mark>

  <figure><img src="/files/GrTyHBjo5DQ8UbHtwNgB" alt=""><figcaption></figcaption></figure>

{% endstep %}

{% step %}

### Complete the setup

Once the network data is saved and the CT ratios have been verified, the Siemens PAC 2200 is ready to be integrated into the EMS system.
{% endstep %}
{% endstepper %}


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