Diagnostics - Siemens SIMATIC S7 System Manual

103BCommunication
10.2 PROFINET
Table 10- 33 Configuring the ET200S PROFINET IO cycle time
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10.2.7

Diagnostics

Diagnostic interrupt organization block (OB82)
If a module with diagnostic capability with diagnostic interrupt enabled detects a change in its
diagnostic status, it sends a diagnostic interrupt request to the CPU for the following
situations:
● A problem has been detected by this module (for example, a wire break) or a component
● The problem has been corrected or no longer exists, and no further components require
If OB82 does not exist, these errors are written to the diagnostics buffer. The CPU does not
take any action or switch to STOP.
If OB82 does exist, the operating system can call OB82 in response to an incoming event.
You must create OB82, and this OB allows you to configure local error handling and a more
detailed reaction to incoming events.
If you are using a DPV1 capable CPU, you can obtain additional information on the interrupt
with the help of the RALRM instruction, which provides more specific information than the
start information of OB82.
Peripheral access alarms
These errors are written to the diagnostics buffer. The CPU does not take any action or
switch to STOP. Errors written to the diagnostics buffer include:
● Module faults
● Module mismatch
● Module missing
440
ET200 S PROFINET IO device
PROFINET port
requires maintenance or both (incoming event).
maintenance (outgoing event).
ET200S PROFINET IO cycle dialog
S7-1200 Programmable controller
System Manual, 11/2011, A5E02486680-05