Evaluation Of The Sf Led (Software Error) - Siemens CPU 313C Hardware And Installation Manual

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Table 11-3
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TOD interrupt is enabled and
triggered. However, a
matching block is not
loaded.
(Software/configuration
error)
Start time of the enabled
TOD interrupt was jumped,
e.g. by advancing the
internal clock.
Delay interrupt triggered by
SFC 32. However, a
matching block is not
loaded.
(Software/configuration
error)
Process interrupt is enabled
and triggered. However, a
matching block is not
loaded.
(Software/configuration
error)
Status alarm is generated,
but the appropriate OB55 is
not loaded.
Update alarm is generated,
but the appropriate OB 56 is
not loaded.
Vendor-specific alarm is
generated, but the
appropriate OB57 is not
loaded.
Attempt to access a missing
or faulty module. (Software
or hardware error)
The cycle time was
exceeded. Probably too
many interrupt OBs called
simultaneously.
11-8

Evaluation of the SF LED (software error)

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Calls OB85. CPU
does not STOP if
OB85 is loaded.
Calls OB80. CPU
does not STOP if
OB80 is loaded.
Calls OB85. CPU
does not STOP if
OB85 is loaded.
Calls OB85. CPU
does not STOP if
OB85 is loaded.
Calls OB85. CPU
does not STOP if
OB85 is loaded.
Calls OB85. CPU
does not STOP if
OB85 is loaded.
Calls OB85. CPU
does not STOP if
OB85 is loaded.
Calls OB85. CPU
does not STOP if
OB85 is loaded or, if
OB80 is loaded, the
cycle time is
exceeded a second
time without being
triggered again.
Calls OB80. CPU
does not STOP if it is
OB80 is loaded or
called for a second
time.
S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x
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Load OB 10 (OB number is
apparent from the diagnostic
buffer).
Disable the TOD interrupt before
you set the time-of-day with SFC
29.
Load OB20 or OB21 (CPU 317-2
DP only) (OB number is apparent
from diagnostic buffer).
Load OB40 (OB number is
apparent from the diagnostic
buffer).
Load OB55
Load OB56
Load OB57
Generate OB 85, the start
information of the OB contains the
address of the relevant module.
Replace the relevant module or
eliminate the program error.
Extension of the cycle time
(STEP 7 - Hardware configuration),
changing the program structure.
Remedy: if required, retrigger cycle
time monitoring via SFC 43
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