15 - 22
MELSEC-Q
15 TROUBLESHOOTING
Classification
of errors
Error
code
Error name Error Operation status at error occurrence
Positioning
operation
errors
546
Illegal setting of ABS
direction in unit of
degree
The setting value of ABS direction in
the unit of degree is as follows.
• Set outside the setting range.
• A figure other than "0" is set when
the software stroke limit is valid.
At start: The system will not operate.
During operation:
The system decelerates to a
stop.
(Note that, in the continuous
positioning control and continuous
path control, the system continues
operating with the setting set at the
time of start even if the setting is
changed during the operation.)
800 Hold error
In the PLC CPU unit parameter
"Output at error stop", the setting for
QD75 is "Hold".
At start: The system will not operate.
During operation:
The system stops with the
setting (deceleration
stop/sudden stop) of the
detailed parameter 2 sudden
stop selection
(stop group 3).
(Note that the deceleration stop only
occurs during the manual pulse
generator operation.)
801
Flash ROM write
error
Data is not written to the flash ROM.
802
Flash ROM sum
check error
While data is written to the flash
ROM, the power is turned OFF.
At start: The system will not operate.
803 PLC CPU error The PLC CPU has an error.
804
Dedicated instruction
parameter error
The value of a parameter used for
the dedicated instruction is
erroneous.
At start: The system will not operate.
During operation:
The system stops with the
setting (deceleration
stop/sudden stop) of the
detailed parameter 2 sudden
stop selection
(stop group 3).
(Note that the deceleration stop only
occurs during the manual pulse
generator operation.)
805
Flash ROM write
number error
Data is written to the flash ROM
continuously 25 times or more from
the sequence program.
I/F
errors
806
Dedicated instruction
I/F error
Mismatching occurs between the
PLC CPU and QD75.
At start: The system will not operate.
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