Siemens SIMATIC ET 200AL System Manual page 290

Interrupts, error messages, diagnostics and system alarms
5.3 Alarms
5.3.8 Channel diagnostics
Function
Channel diagnostics provides information about channel errors in modules and details of the
identifier-related diagnostics. Channel diagnostics begins after the module status. Channel
diagnostics does not affect the module status.
The figure below shows how the channel diagnostics for the ET 200AL distributed I/O system
is structured with the IM 157-1 DP interface module.
Figure 5-14
40
Structure of channel diagnostics
IM 157-1 DP (6ES7157-1AA00-0AB0)
Equipment Manual, 08/2021, A5E32100641-AE