Filter
Top Products
15 - 10
MELSEC-Q
15 TROUBLESHOOTING
Classification
of errors
Error
code
Error name Error Operation status at error occurrence
<When blocks are started
simultaneously>
• The partner axis for simultaneous
start is BUSY.
501
Error before
simultaneous start
<When multiple axes are started and
controlled simultaneously>
• The partner axis for simultaneous
start is BUSY.
• The "Simultaneous start axis start
data No." of the start axis is 0 or is
outside the setting range.
• The "Simultaneous start axis start
data No." of those axes other than
the start axis is outside the setting
range.
At start: The system will not operate.
During operation:
The system stops
immediately.
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.
Positioning
operation
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 switching control.
At the start of positioning, operation
does not start.