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S7-300 Automation System, Hardware and Installation: CPU 312IFM - 318-2 DP
A5E00203919-01
11-9
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Programming error
• Block not loaded
• Wrong block number
• Wrong timer/counter
number
• Read/write access to
wrong area
• Etc.
Calls OB 121. CPU
does not STOP if
OB 121 is loaded.
Eliminate the programming error.
The STEP 7 testing function helps
you to locate the error.
I/O access error
An error has occurred when
module data was accessed
Calls OB122. CPU
does not STOP if
OB122 is loaded.
Check module addressing in HW
Config or whether a module/DP
slave has failed.
Global data communication
error, e.g. insufficient length
of the DB for global data
communication.
Calls OB 87. CPU
does not STOP if
OB 87 is loaded.
Check global data communication
in STEP 7. If required, correct the
DB size.
Table 11-4 Evaluation of the SF LED (hardware error)
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A module was removed or
inserted during operation.
CPU goes into STOP Screw-tighten the modules and
restart the CPU.
A diagnosable module
reports a diagnostic
interrupt.
Calls OB 82. CPU
does not STOP if
OB 82 is loaded.
response to the diagnostic event,
depending on the module's
configuration.
Attempt to access a missing
or faulty module. Loose
connector (Software or
hardware error).
Call of OB 85, if
access was attempted
during update of the
process image (here,
the OB85 call must be
enabled accordingly in
the parameters). Call
of OB122 with direct
I/O access. CPU
switches to STOP if
the OB is not loaded.
Generate OB 85, the start
information of the OB contains the
address of the relevant module.
Replace the relevant module,
tighten the plug or eliminate the
program error.
Faulty Memory Card. The CPU goes into
STOP mode and
requests memory
reset.
Replace the Memory Card, reset
CPU memory, transfer the program
again and set the CPU to RUN
mode.
Tip: You can use SFC 39 to disable all interrupts and asynchronous error events.
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