Mitsubishi Electric MELSEC-Q Series User Manual page 94

3 SPECIFICATIONS
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(4) Module ready flag (Xn3)
(a) This signal turns on when the Q62HLC is ready for operation after the
programmable controller CPU is powered on or reset.
(b) To read/write data in the buffer memory of the Q62HLC from/to the
programmable controller CPU, Module ready flag (Xn3) needs to be on.
(c) When this signal turns off, check the status of Watchdog timer error flag
(Xn0).
If Watchdog timer error flag (Xn0) is on, take a corrective action referring to
Section 8.6.
(5) Auto tuning status flag (Xn4, Xn5)
(a) This signal turns on when auto tuning of the corresponding channel is
executed.
Channel
1
2
(b) Auto tuning is executed using Auto tuning start command (Yn4, Yn5).
(c) This signal turns on while auto tuning is being executed, and turns off
automatically when completed.
If the auto tuning is not completed successfully, the signal automatically
turns off and the corresponding error code is stored in Error code (buffer
memory address: 0).
For error codes, refer to Section 8.1.
(6) FeRAM write completion flag (Xn8)
(a) This signal turns on when data in the buffer memory is successfully written
to FeRAM after FeRAM backup start command (Yn8) is turned on.
After turning on Yn8, it takes more than ten seconds until Xn8 turns on.
(b) When FeRAM backup start command (Yn8) turns off, this flag (Xn8) also
turns off.
ON
OFF
Yn8
OFF
Xn8
OFF
XnA
Auto tuning status flag
Xn4
Xn5
During write to FeRAM
MELSEC-Q
On/off status
ON : Auto tuning in execution
OFF: Auto tuning not in execution or
completed
ON
Completion of write to FeRAM
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