Corrective maintenance Report, locate, and eliminate faults quickly SIMATIC system and process diagnostics Giving you simple, reliable fault recognition and reporting. Information is made available to operating and maintenance personnel exactly where it is needed – on machine-level HMI devices and with WinCC. Monitoring the status and operation of your plant or machine with SIMATIC STEP7, S7 PDIAG and ProAgent gives plant/machine personnel optimal troubleshooting and debugging support by automatically notifying them of the location and cause of a problem, thus: increasing plant availability shortening downtimes.