Input Signal Functions - Mitsubishi Electric MELSEC-Q Series User Manual

3 SPECIFICATIONS

3.4.2 Input signal functions

Buffer memory
address: 0
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(1) Watchdog timer error flag (Xn0)
This signal turns on when the Q62HLC detects a watchdog timer error.
(2) Setting/operation mode status (Xn1)
This signal turns on in the operation mode and turns off in the setting mode.
Modes can be switched using Setting/operation mode command (Yn1).
Do not change the setting value during mode shift processing.
(3) Error flag (Xn2)
(a) This signal turns on when a write error to the buffer memory has occurred,
the hardware has failed, or auto tuning has not completed successfully.
A write error occurs under any of the following conditions.
• Data is set to the use prohibited signal.
• The setting value of the signal where data change is enabled only in the
setting mode is changed in the operation mode.
• A value out of the setting range is set.
• The setting value is changed during default setting registration.
At the occurrence of error, the corresponding error code and error cause
are stored in Error code (buffer memory address: 0).
(b) By turning on Error reset command (Yn2), Error flag (Xn2) is turned off, and
the error code is cleared.
Xn2
OFF
00
H
OFF
Yn2
ON
Error code
MELSEC-Q
00
H
ON
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