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16 RAS FUNCTIONS
16.2 Event History Function
How to clear errors
Errors can be cleared in two ways:
■Using the engineering tool
Clear errors with the module diagnostics function of engineering tool. (GX Works3 Operating Manual)
■Using SM/SD
Clear errors by operating SM/SD.
1. Check SD0 (Latest self-diagnostics error code) to identify what errors are detected.
2. Clear the cause of each of the currently detected continuation errors.
3. Turn off and on SM50 (error reset).
When clearing the error with the error code (2400H), set "Continue" to "Module Verification Error" in "CPU
Module Operation Setting at Error Detected". (Page 135 CPU module operation upon error detection
setting) However, SM61 (I/O module verify error) which is turned ON when the error code (2400H) occurs is
not turned OFF. To turn OFF SM61, the CPU module must be turned ON or reset.
Precautions
This section describes some precautions to take when using the error clear function:
• Since the function clears all of the currently detected continuation errors at once, errors that should not yet be cleared may
be cleared.
• Use the RST instruction to reset each annunciator individually.
16.2 Event History Function
Information including errors detected in the CPU module, expansion board, expansion adapter and intelligent module, and
errors that occur in the network is collected and saved by the CPU module. Once errors are stored, they can be checked
chronologically. This function can be used to pinpoint the cause of faults that occur in the system or device.
For supported version of event history function, refer to Page 942 Added and Enhanced Functions.
The event history information is constantly collected regardless of the operating state of the CPU module.
There are occasions, however, when the event history information cannot be collected due to a major error in
a module, a cable failure, or some other cause.
Engineering tool
The event information held by the CPU
module is displayed by the engineering
tool.
The event information that occurred
in the CPU module, expansion board,
expansion adapter and intelligent
module is collected in batch and
saved by the CPU module.
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