Interrupts, diagnostics, error, and system messages
5.3 Alarms
IM 155-6 PN ST interface module (6ES7155-6AU01-0BN0)
Equipment Manual, 10/2020, A5E03576904-AE
33
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 diagnostic system in
the case of the following events:
Table 5- 7
Triggering of a maintenance event
Maintenance alarm
Event
Meaning
Maintenance de-
manded
(
maintenance
demanded
)
LED MAINT is lit.
Synchronization
loss
•
No synchronization frame received
No synchronization frame was received by the sync
master within the timeout period after parameter as-
signment or during operation.
•
Successive synchronization frames are located out-
side permitted limits (jitter)
System events in STEP 7 (TIA Portal)
The maintenance information is generated in STEP 7 with the following system events:
•
Maintenance demanded - indicated for each port by a yellow wrench icon in the device
view or in the hardware configuration.
You can find more information in the STEP 7 online help.
5.3.3
Channel diagnostics
Function
Channel-related diagnostics provides information about channel faults in modules.
Channel faults are mapped as channel diagnostics data in IO diagnostics data records.
The data record is read using the instruction "RDREC".
Structure of the diagnostics data records
The data records supported by the ET 200SP distributed I/O system are based on the standard
PROFINET IO - Application Layer Service Definition V2.3.
You can purchase the standard from the PROFIBUS User Organization on the Internet
).
