Evaluating The Sf Led In Case Of Hardware Errors - Siemens Simatic S7-300 CPU 31xC Series Installation And Operating Instructions Manual

10.6.4

Evaluating the SF LED in case of hardware errors

Table 10-4
Possible errors
A module was removed or
inserted while the system was
in RUN.
A distributed module was
removed or inserted on
PROFIBUS DP while the
system was in RUN.
A distributed module was
removed or inserted on
PROFINET IO while the
system was in RUN.
A diagnosable module reports
a diagnostic interrupt.
Attempt to access a missing
or faulty module. Loose
connector (software or
hardware error).
MMC is defective.
Reference
Details on the OBs and on SFCs required for their evaluation can be found in the
Online Help
Functions
S7-300, CPU 31xC and CPU 31x: Installation
Operating Instructions, Edition 08/2004, A5E00105492-05
Evaluation of the SF LED (Hardware error)
Response of the CPU
CPU goes into STOP.
Calls OB86. CPU does not
STOP if OB86 is loaded.
When the module is integrated
by means of GSD file:
Call of OB82. CPU goes into
STOP when OB82 is not loaded.
Call of OB 83. CPU goes not
STOP if OB 83 is not loaded.
OB 86 is also called when one or
several modules of an ET 200S
(IO device) are removed or
inserted while the system is in
RUN. CPU switches to STOP if
OB86 is not loaded.
Calls OB82. CPU goes into
STOP if OB 82 is not loaded.
Call of OB85, if access was
attempted during update of the
process image (OB 85 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.
The CPU goes into STOP mode
and requests memory reset.
System Software for S7-300/400 - System and Standard
and in the Manual
.
Debugging functions, diagnostics and troubleshooting
10.6 Diagnostics using status and error LEDs
Remedies
Screw-tighten the modules and
restart the CPU.
Load OB86 or OB82.
Load OB 83 and OB 86.
Reaction to the diagnostic event,
based on the module
configuration.
Load 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.
Replace MMC, reset CPU
memory, transfer the program
again, then set the CPU to RUN
mode.
STEP 7
10-13