Corrective maintenance Report, locate, and eliminate faults quickly Maintenance with the SIMATIC S7 using Internet technology The advent of Internet technology in the Simatic S7 (CP243-1IT, CP343-1IT. CP443-1IT) supports machine builders and plant operators in diagnosing and eliminating faults via e-mail and Web browser. As well as location-independent and simple access to diagnostics information, troubleshooting can be simplified by combining it with supplementary multimedia information.