Clearing Errors In The Cpu Module Of The Standby System From The Cpu Module Of The Control System - Mitsubishi Electric MELSEC iQ-R Series User Manual

How to clear errors
Errors can be cleared in two ways:
■Using the engineering tool
Clear errors with the module diagnostics function of GX Works3. ( GX Works3 Operating Manual)
The event history of error clear using the engineering tool is stored in the CPU module connected.
■Using SM/SD
Clear errors by operating SM/SD.
1.
Check SD0 (Latest self-diagnostic error code) to identify what errors are detected.
2.
Clear the cause of each of the currently detected continuation errors.
3.
Turn on SM50 (Error reset) to clear the errors. When multiple continuation errors have occurred, all the errors are
cleared at once.
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.
• Running the error clear function does not remove the cleared errors from the event history.
• The cause of an error which occurred in a module other than the target CPU module for the error clear cannot be eliminated
even though the error is cleared using this function. For example, when "Module verification error" (error code: 2400) or
"Module major error" (error code: 2450) occurred, the error cause cannot be eliminated even though the error is cleared in
the CPU module using this function. To eliminate the error cause, clear the error of the target module and reset the CPU
module.
Clearing errors in the CPU module of the standby system from
the CPU module of the control system
Errors in the standby system can be cleared from the CPU module of the control system by using SM1679 (Error reset (the
other system)) in a program or external device.
Error clearing procedure
Use SM1679 to clear errors.
1.
Eliminate the causes of all the continuation errors that have occurred in the standby system.
2.
Turn on SM1679 of the CPU module of the control system to clear the errors. When multiple continuation errors have
occurred, all the errors are cleared at once.
Precautions
• The error clear operation with SM1679 can be performed by the CPU module of the control system only. A continuation
error in the CPU module of the standby system cannot be cleared by turning on SM1679 of the CPU module of the standby
system.
• The error clear operation with SM1679 can be performed in backup mode only.
• The cause of an error which has occurred in a module other than the error clear target CPU module cannot be eliminated
even though the error clear operation with SM1679 is performed.
• If the error cause has not been eliminated completely after the error clear operation, the same error will be detected again.
• The error clear processing is performed in the END processing. To clear an error, execute the END instruction while
SM1679 is on.
15 RAS FUNCTIONS
210
15.3 Error Clear