Mitsubishi Q00CPU, User Manual

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6
- 142 6.17 Self-diagnostics Function
6.17.2 LED display at the time of error occurrence
6
FUNCTIONS
6.17.2 LED display at the time of error occurrence
At the time of error occurrence, the LED located on the front of the CPU module turns on
or flashes. (
Section 6.21)
6.17.3 Error Clear
CPU module error clear operation can be performed only for error that can continue the
CPU module operation.
(1) Procedures for error clear
The error clear is performed as follows:
• Resolve the cause of error.
• Store the error code of the error to be canceled in the special register SD50.
• Switch special relay SM50 from OFF to ON.
• The error is canceled.
(a) Error Clear procedure when multiple errors have occurred
When the latest error (error stored in the special register SD0) is cleared, the error
information of the special relays/registers (SM0, SM1, SM5, SM16, SD0 to 26) is
cleared, and therefore the information of the errors not cleared cannot be obtained
from the special relays/registers.
For the errors that have not been cleared, obtain the past errors from the error
history (
Section 6.18).
(2) Status after error clear
When the CPU module is recovered by clearing the error, the special relay, special
register, and LED affected by the error are set to the status before the error occurred.
When the same error occurs after clearing the error, it is logged again in the error
history.
(3) Clear of annunciator
For the clear of the annunciator detected multiple times, only the first detected "F" is
cleared. (
Section 10.2.5)