When a system error occurs, hardware components and devices of other manufacturers can trigger a system reaction. The hardware components provide information on the system error that has occurred. For S7-1500 PLCs, the system diagnostics provides a convenient way to evaluate this diagnostic information and display it in the form of alarms.
The system diagnostics are integrated in the firmware of the CPU S7-1500 and work independently from cyclic user programs. Therefore it is also available in the CPU operating mode STOP. Any faults are detected immediately and reported to the higher-level HMI device, the web server, the display of the CPU S7-1500, the LED displays in the module concerned and in the TIA Portal even in the operating mode STOP. Therefore, the system diagnostics are always synchronous with the actual system status.
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