A CU320-2 Control Unit can perform the communication, open-loop and closed-loop control functions for several power units. The computing capacity requirement increases in proportion to the number of power units and system components and in relation to the dynamic response required. The computing capacity requirement and utilization of the CU320‑2 Control Unit can be calculated with the SIZER for Siemens Drives engineering tool. The full computing capacity of the CU320-2 Control Unit is only available on systems with performance extension. For the CU320‑2 Control Unit, the performance extension is necessary from the 4th axis.

In addition to the firmware, the CompactFlash card also contains licensing codes which are required to enable firmware options.

In addition to the Article No., the following firmware options can currently be ordered with or without performance extension:

• Safety Integrated Extended Functions, order code per axis F01 to F06
• High output frequency, order code J01
• DCB Extension, order code U01

Converter cabinets with a Control Unit already contain the CompactFlash card with the current firmware. The firmware options can be added as cabinet options.

The firmware options can also be enabled subsequently. You require the serial number of the CompactFlash card and the article number of the firmware option to be enabled. With this information, you can purchase the associated license code from a license database and enable the firmware option. The license code is only valid for the CompactFlash card declared and cannot be transferred to other CompactFlash cards.

Subsequent licensing is possible in the Internet via the WEB License Manager by generating a license key:
http://www.siemens.com/automation/license