# Siemens PAC

> Supported Devices: Siemens PAC 2200,

Source: https://voltmasters.io/en/docs/device-integrations/energy-meters/siemens-pac/

1. **Access the menu**
   
   To change the settings, navigate using the meter's display.
   
   ![A Siemens PAC2200 on a DIN rail next to circuit breakers, its display showing the instantaneous phase to phase voltages L12, L23 and L31.](https://voltmasters.io/assets/docs/image-51.webp)
   
   -   Press the bottom button (F4) to open the main menu.
   -   Navigate to Settings.
   
   ![The PAC2200 main menu with Settings highlighted, below Active energy and Reactive energy.](https://voltmasters.io/assets/docs/image-52.webp)
2. **Configure network and communication**
   
   Use a stable network connection. A static IP address is recommended.
   
   In the **Settings** menu, go to **Communication**.
   
   ![The PAC2200 Settings menu with Communication highlighted, between Integrated I/O and Display.](https://voltmasters.io/assets/docs/image-53.webp)
   
   -   Select Modbus TCP.
   
   ![The PAC2200 Communication menu with its single entry, Modbus TCP, highlighted.](https://voltmasters.io/assets/docs/image-54.webp)
   
   -   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.
   
   ![The PAC2200 Modbus TCP screen with DHCP ticked, the IP address, subnet mask and gateway filled in, and Modbus port 502.](https://voltmasters.io/assets/docs/image-59.webp)
3. **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.
   
   ![The PAC2200 Settings menu with Basic parameters highlighted, below Device info and Language.](https://voltmasters.io/assets/docs/image-60.webp)
   
   -   Choose Current Inputs.
   
   ![The PAC2200 Basic parameters menu showing Voltage inputs and Current inputs, with Current inputs highlighted.](https://voltmasters.io/assets/docs/image-61.webp)
   
   -   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).
       
       Warning: Incorrect values will lead to wrong measurements, causing the energy management system to malfunction.
       
       ![The PAC2200 Current inputs screen with CT primary 250 A, CT secondary 5 A and a display range of 100 A.](https://voltmasters.io/assets/docs/image-57.webp)
4. **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.