Siemens SIMATIC ET 200AL System Manual page 288

Interrupts, error messages, diagnostics and system alarms
5.3 Alarms
5.3.6 Identifier-related diagnostics
The identifier-related diagnostics indicates whether modules of the ET 200AL distributed I/O
system have errors or not. Identifier-related diagnostics starts at byte 6 and comprises
6 bytes.
The figure below shows how the identifier-related diagnostics for the ET 200AL distributed
I/O system is structured with the IM 157-1 DP interface module.
Figure 5-12
38
Structure of the identifier-related diagnostics
IM 157-1 DP (6ES7157-1AA00-0AB0)
Equipment Manual, 08/2021, A5E32100641-AE