Siemens S7-300 - Evaluation of the SF LED (Software Error)

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S7-300 Automation System, Hardware and Installation: CPU 312IFM - 318-2 DP
11-8 A5E00203919-01
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This status has no effect on the current CPU function.
Table 11-3 Evaluation of the SF LED (software error)
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TOD interrupt is enabled and
triggered. However, a
matching block is not
loaded.
(Software/configuration
error)
Calls OB 85. CPU
does not STOP if
OB 85 is loaded.
Load OB 10 or 11 (CPU 318-2
only) (OB number can be viewed in
the diagnostic buffer).
Start time of the enabled
TOD interrupt was jumped,
e.g. by advancing the
internal clock.
Calls OB 80. CPU
does not STOP if
OB 80 is loaded.
Disable the TOD interrupt before
you set the time-of-day with
SFC29.
Delay interrupt triggered by
SFC 32. However, a
matching block is not
loaded.
(Software/configuration
error)
Calls OB 85. CPU
does not STOP if
OB 85 is loaded.
Load OB 20 or 21 (CPU 318-2
only) (the OB number can be
viewed in the diagnostic buffer).
Process interrupt is enabled
and triggered. However, a
matching block is not
loaded.
(Software/configuration
error)
Calls OB 85. CPU
does not STOP if
OB 85 is loaded.
Load OB 40 or 41 (CPU 318-2
only) (the OB number can be
viewed in the diagnostic buffer).
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Status interrupt is generated,
however, an appropriate
OB55 is not loaded.
Calls OB85. CPU
does not STOP if
OB85 is loaded.
Load OB55
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Update interrupt is
generated, however, an
appropriate OB56 is not
loaded.
Calls OB85. CPU
does not STOP if
OB85 is loaded.
Load OB 56
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Manufacturer-specific
interrupt is generated,
however, an appropriate
OB57 is not loaded.
Calls OB85. CPU
does not STOP if
OB85 is loaded.
Load OB 57
Attempt to access a missing
or faulty module. (Software
or hardware error)
Calls OB 85. CPU
does not STOP if OB
85 is loaded or, if OB
80 is loaded, the cycle
time is exceeded a
second time without
being triggered again.
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.
The cycle time was
exceeded. Probably too
many interrupt OBs called
simultaneously.
Calls OB 80. CPU
does not STOP if it is
OB 80 is loaded or
called for a second
time.
Extension of the cycle time
(STEP 7 – Hardware
configuration), changing the
program structure. Remedy: if
required, retrigger cycle time
monitoring via SFC 43