Managed System Services Preventive System Analysis 4x20 the service includes: 1 year; 4 reports; 20 devices analysis of the system-relevant SIMATIC diagnostics data. evaluation by an expert with appropriate recommended actions. support during implementation of the preventive measures. results in the form of a system status report and an interview. verification is carried out every quarter for provided data of the last 3 months. provision takes place via SIMATIC Assessment Suite DC.