Siemens SIMATIC ET 200AL - Diagnostics and Configuration Data Records; Diagnostics in the User Program

Diagnostics and maintenance
4.8 Diagnostics in the user program
PROFINET with STEP 7 V15
Function Manual, 12/2017, A5E03444486-AH
109
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.
Addressing levels of diagnostics data records
Diagnostics and configuration data is evaluated at the following addressing levels:
● Device level
● AR (Application Relation)
● API (Application Process Identifier)
● Slot
● Subslot