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MELSEC-
A
14 TROUBLESHOOTING
Division of
warning
Warning
code
Warning name Description Action at occurrence of warning
Positioning
operation
500
Deceleration and
stop speed
change
A speed change request is issued during
deceleration and stop.
Speed change is not carried out.
501
Speed limit value
over
The new speed value given during operation
exceeds the speed limit value.
The speed is controlled to the “speed limit
value.”
The “in speed limit flag” is turned ON.
503
M code ON
signal ON start
The M code ON signal is turned ON during
execution of positioning data.
Execution of positioning data continues.
505
No operation end
setting
In the block start positioning operation, the
setting at 50th point in the positioning start
data indicates continuation.
Operation is terminated.
506
FOR to NEXT
nesting structure
There is a nested set of FOR and NEXT.
Operation continues.
508
Speed/position
changeover
signal ON during
acceleration
The changeover signal is turned ON during
acceleration under speed/position changeover
control.
509
Insufficient
remaining
distance
The deceleration distance for a speed change
request is insufficient.
A speed change occurs at the nearest value.
(However, the request is ignored if the
operation pattern is continuous path control.)
511
Invalid step start
information
“2: Restart” is specified for the step start
information in the “in step wait” axis operation
status.
Step operation does not start.
“1: Step continue” or “2: Restart” is specified in
the step start information in the “step error
occurring,” “error occurring,” “waiting,” or
“stopped” axis operation status.
512
Illegal external
start function
The “external start function selection” setting in
detail parameter 2 exceeds the setting range.
Nothing occurs in response to the external start
signal.
513
Insufficient
movement
amount
There is no movement amount necessary for
automatic deceleration.
Immediate stop after the positioning address is
reached
514
Outside
command speed
range
The command speed exceeds the speed limit
value.
The command speed is controlled to the
“speed limit value.”
The “in speed limit flag” is set.
System
control data
900
Illegal clock data
setting
The clock data is written when the clock data
setting is out of the setting range.
The clock data is not written.