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 expansion. For the CU320?2 Control Unit, the performance expansion is necessary for machines with 4 axes or more.

In addition to the firmware, the CompactFlash card also contains license keys which are required to enable firmware options, e.g. for the performance expansion and the Safety Integrated extended functions. The Safety Integrated extended functions must be ordered for each axis via order codes (F..) in addition to the article number.
Converter cabinets with a Control Unit already contain the CompactFlash card with the current firmware. The firmware licenses can be added as a cabinet option.

The firmware options can also be enabled later, for example, if the performance expansions required are not known at the time of placing the order or the Safety Integrated Extended Functions are to be enabled retrospectively. 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