Addressing - Siemens S7-300 Installation Manual

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