Siemens SIMATIC PLC 6AV2103-0HA00-0AL0 SIMATIC WINCC PROFESSIONAL  4096 POWERTAGS, SUS  SOFTWARE UPDATE SERVICE,  WITHIN THE FRAMEWORK OF THIS  CONTRACT, YOU WILL RECEIVE  UPDATED SOFTWARE VERSIONS  FOR A PERIOD OF ONE YEAR.  IF IT IS NOT CANCELED THREE  MONTHS PRIOR TO ITS EXPIRATION.  PERIOD OF DELIVERY AND  PERFORMANCE:  1 YEAR FROM DATE OF INVOICE  PREREQUISITE FOR CONTRACT:  CURRENT VERSION OF THE SOFTWARE 6AV21030HA000AL0