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6.17.3Error clear
The CPU module can clear an error by a program if the error does not stop program operation.
(1) Procedures for error clear
Clear an error by the following procedures.
• Resolve the error cause.
• Store the code of the error to be cleared in the special register SD50.
• Turn off and then on the special relay SM50.
• The error is cleared.
(a) Procedures for error clear in case of multiple errors
When the latest error (error stored in the special register SD0) is cleared, error information stored in special
relays and special registers (SM0, SM1, SM5, SM16, SD0 to SD26) are cleared and therefore information on
errors that have not been cleared cannot be obtained from the special relays and special registers.
For the errors that have not been cleared, obtain the past errors from the error history.
(
Section 6.18) and clear the errors.
(2) Status after error clear
When the CPU module is recovered by clearing the error, the special relay, special register, and LEDs affected by
the error return to the status before the error.
If the same error occurs after clearing the error, it is logged in the error history again.
(3) Clear of annunciator
When multiple annunciators are detected, only the first detected "F" is cleared. (
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When an error is cleared by storing the code of the error to be cleared in SD50, the last digit of the code number is
ignored.
When the error code 2410, 2411, or 2412 occurs, clearing the error by storing 2412 in SD50 also clears
the error codes 2410 and 2411.
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If the CPU module is not an error cause, the error cannot be resolved by using the special relay (SM50) and special
register (SD50).
Since "SP. UNIT DOWN" indicates an error occurred to the Q bus, the error cannot be resolved by using
the special relay (SM50) and special register (SD50).
To resolve the error cause, refer to the following.
QCPU User's Manual (Hardware Design, Maintenance and Inspecting)
Example
Example
