SIMATIC S7, S7-Graph Software Update Service. Under this contract, you will receive all current software versions for one year. The contract automatically extends for another year unless canceled three months before expiration. Delivery and performance period: one year from the invoice date. Prerequisite for conclusion: current version of the software. SIMATIC S7-GRAPH is based on the programming software STEP 7. It is used for sequential processes with alternative or parallel step sequences. The processes are designed and programmed clearly and quickly in a standardized representation (according to IEC 61131-3, DIN EN 61131). The process is graphically described and broken down into individual steps with manageable functionality. Actions can be defined for the steps, and their execution can be controlled. Transitions (transition conditions) regulate the transitions from one step to the next. For each step, locking and monitoring conditions are defined. S7-GRAPH is already included in STEP 7 Professional (TIA Portal).