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Chapter 16 Troubleshooting
Classification
of errors
Error
code
Error name Error Operation status at error occurrence
Positioning
operation
errors
501
Error before
simultaneous start
QD77MS2 QD77MS4
<When blocks are started simultaneously>
• The partner axis for simultaneous start is
BUSY.
At start : The system does not
operate.
During operation : The system stops
immediately.
<When multiple axes are started and
controlled simultaneously>
• The partner axis for simultaneous start is
BUSY.
• The "Simultaneous starting axis start data
No." of the start axis is 0 or is outside the
setting range.
• The "Simultaneous starting axis start data
No." of those axes other than the start
axis is outside the setting range.
Error before
simultaneous start
QD77MS16
<When blocks are started simultaneously>
• The partner axis for simultaneous start is
BUSY.
<When multiple axes are started and
controlled simultaneously>
• The same axis number is set to multiple
simultaneous start axes.
• The own axis number is set to a
simultaneous start axis.
• The number of simultaneous start axes is
outside the setting range of 2 to 4.
• The partner axis for simultaneous start is
BUSY.
• The "Simultaneous starting axis start data
No." of the start axis and the partner axis
for simultaneous start is 0 or is outside the
setting range.
502 Illegal data No.
• The positioning data No. tried to be
executed is outside the ranges of 1 to
600, 7000 to 7004, and 9001 to 9004.
• The designation of a JUMP destination is
executed currently.
• The designation of a JUMP destination is
outside the ranges of 1 to 600.
The positioning data is not executed.
503 No command speed
• At the start of positioning, a current speed
(–1) is set for the command speed of the
positioning data to be initially executed.
• The current speed is set by speed control.
• The current speed is set for speed-
position or position-speed switching
control.
The operation does not start at positioning
start.