Siemens SIMATIC ET 200AL System Manual page 1010

Overview of system diagnostics
2.2 Benefits of innovative system diagnostics
2.2 Benefits of innovative system diagnostics
System diagnostics is also possible in STOP
The system diagnostics is integrated in the firmware of the CPU and works independently of
the cyclic user program. This means it is also available in the STOP CPU operating mode.
Faults are detected immediately and signaled to the higher-level HMI devices, the Web
server and the display of the SIMATIC S7-1500 CPU, even in STOP mode. This makes
system diagnostics consistent with the actual plant state at all times.
Uniform display concept
All clients of a system are provided with diagnostics information by a uniform mechanism.
The same system diagnostics information is used regardless of the display medium.
Step
①
②
Figure 2-2
14
Description
The device detects an error and sends diagnostics data to the assigned CPU.
The CPU informs the connected display media. The display of the system diagnostics is
updated.
Sequence of the system diagnostics
Function Manual, 11/2019, A5E03735838-AF
Diagnostics