SIMATIC S7, F PROGRAMMING TOOL, STEP 7 SAFETY BASIC, SOFTWARE UPDATE SERVICE WITHIN THE FRAMEWORK OF THIS CONTRACT, YOU WILL RECEIVE UPDATED SOFTWARE VERSIONS FOR A PERIOD OF ONE YEAR. EXTENDED BY ANOTHER 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