Software; Evaluation Of The Sf Led (Software Error) - Siemens SIMATIC S7-300 Hardware And Installation Manual

Testing functions, Diagnostics and Fault Elimination
Table 11-3
Possible Errors
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 OB 55 is
not loaded.
Update alarm is generated,
but the appropriate OB 56 is
not loaded.
Vendor-specific alarm is
generated, but the
appropriate OB 57 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.
Programming error
•
Block not loaded
•
Wrong block number
•
Wrong timer/counter
11-8

Evaluation of the SF LED (software error)

response of the CPU Remedies
Calls OB 85. CPU
does not STOP if
OB 85 is loaded.
Calls OB 80. CPU
does not STOP if
OB 80 is loaded.
Calls OB 85. CPU
does not STOP if
OB 85 is loaded.
Calls OB 85. CPU
does not STOP if
OB 85 is loaded.
Calls OB 85. CPU
does not STOP if
OB 85 is loaded.
Calls OB 85. CPU
does not STOP if
OB 85 is loaded.
Calls OB 85. CPU
does not STOP if
OB 85 is loaded.
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.
Calls OB 80. CPU
does not STOP if it is
OB 80 is loaded or
called for a second
time.
Calls OB 121. CPU
does not STOP if
OB 121 is loaded.
S7-300 Programmable Controller Hardware and Installation
Load OB 10 or 11 (CPU 318-2
only) (OB number can be viewed in
the diagnostic buffer).
Disable the TOD interrupt before
you set the time-of-day with
SFC29.
Load OB 20 or 21 (CPU 318-2
only) (the OB number can be
viewed in the diagnostic buffer).
Load OB 40 or 41 (CPU 318-2
only) (the OB number can be
viewed in the diagnostic buffer).
Load OB 55
Load OB 56
Load OB 57
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
Eliminate the programming error.
The STEP 7 testing function helps
you to locate the error.
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