Siemens SIMATIC ET 200AL System Manual page 329

Causes of error and troubleshooting
Causes of errors and corrective measures of diagnostics alarms are described in the device
manuals of the I/O modules
(http://support.automation.siemens.com/WW/view/en/89013554) in the section Interrupt,
Error and System Messages.
5.3.2 Maintenance events
Triggering of a maintenance event
The PROFINET IO interfaces of the interface module support the diagnostics concept and
maintenance concept in PROFINET IO according to standard IEC 61158-6-10. The goal is the
early recognition and correction of potential disruptions.
For the interface module, maintenance events signal to the user when a network component
must be checked or replaced.
The CPU interrupts user program execution and processes the diagnostic block OB 82. The
event that triggered the maintenance event is entered in the start information of the OB 82.
The interface module signals a maintenance event to the higher-level diagnostics system in
the case of the following event:
Table 5- 5
Maintenance alarm
Maintenance de-
manded
LED MAINT is lit.
System alarms in STEP 7 (TIA Portal)
The maintenance information is generated in STEP 7 (TIA Portal) V12 SP1 and higher with the
following system alarms:
• Maintenance demanded - indicated for each port by a yellow wrench icon
device view or in the hardware configuration.
You can find more information on this topic in the STEP 7 online help.
IM 157-1 PN (6ES7157-1AB00-0AB0)
Equipment Manual, 05/2021, A5E32347036-AE
Interrupts, error messages, diagnostics and system alarms
Triggering of a maintenance event
Event
Synchronization
loss
Alarm/Meaning
• No synchronization frame received.
No synchronization message frame was received by
the sync master within the timeout period after pa-
rameter assignment or during operation.
• Successive synchronization frames are located outside
permitted limits (jitter).
5.3 Alarms
in the
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