Diagnostics In The User Program; Diagnostics And Configuration Data Records - Siemens SIMATIC ET 200AL System Manual

4.8

Diagnostics in the user program

4.8.1

Diagnostics and configuration data records

Diagnostics mechanism
The IO device outputs a diagnostics interrupt to the IO controller when it detects faults such
as wire break on an IO module. This interrupt calls a corresponding organization block in the
user program (diagnostics interrupt OB82), in order to generate a defined (programmed)
response to the fault and passes a diagnostics data record.
Diagnostics data records in PROFINET IO
There are two different types of diagnostics data record:
1. Channel diagnostics data records
Channel diagnostics data records are generated if a channel is in an error state and / or has
triggered an interrupt.
A diagnostics data record of length 0 is returned if there is no fault.
2. Vendor-specific diagnostics data records
The structure and size of vendor-specific diagnostics data records depend on the vendor's
settings.
For information about vendor-specific diagnostics data records, refer to the appropriate
device manual.
PROFINET with STEP 7
Function Manual, 05/2021, A5E03444486-AL
Diagnostics and maintenance
4.8 Diagnostics in the user program
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