Siemens CPU 313C Hardware And Installation Manual page 162

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Locate the cause of a module error by viewing the online information on the
module. You can locate the cause of an error in the user program cycle with the
help of the diagnostic buffer and of the stack content. You can also check whether
a user program will run on a specific CPU.
Hardware diagnostics give you an overview of the PLC status. In an overview
symbols can display the error status of every module. A double-click on the faulty
module opens detailed error information. The scope of this information depends on
the specific module. You can view the following information:
• Display of general information on the module (e.g. order No., version,
designation) and module status (e.g. error).
• Display of module errors (e.g. channel error) in the central I/O and DP slave.
• Display of messages from the diagnostic buffer.
For CPUs you can also view the following module status information:
• Cause of an error in the user program cycle.
• Display of the cycle time (longest, shortest and last cycle).
• Options and utilization of MPI communication.
• Display of performance data (number of possible /IOs, memory bits, counters,
timers and blocks).
Details on diagnostic options in STEP 7 and procedures are found in the
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11-6
S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x
A5E00105492-03