520
Error Processing Section 11-2
11-2-9 Cycle Time Too Long Error Check
11-2-10 PLC Setup Setting Error Check
Yes
No
Yes
No
The cycle time was too long.
A40515 (Peripheral
Servicing Cycle Too
Long) ON?
Anticipated cycle time
less than PLC Setup
monitor setting?
Interrupts being
used?
A440
(Maximum Interrupt
Processing Time) value
acceptable?
The peripheral servicing cycle time
exceeded 2 s. Reduce the event load
or set the CPU processing mode in
the PLC Setup to Normal Mode or
Peripheral Servicing Priority Mode.
The Parallel Processing Modes may
not function properly if the program
execution cycle time (A266) is too
short (less than 0.2 ms.)
The monitoring time was execution
time was exceed for program
execution. Increase the monitoring
time set in the PLC Setup.
The problem may be caused by long
processing times for interrupt tasks. Check
the contents of the task specified in A441
(Task with Highest Processing Time).
There may be more than one interrupt
task occurring, causing the cycle time
to be increased. Reduce the
frequency of interrupts.
There may be a bug in the program. Check
all tasks for the following instructions.
FOR and LOOP
J M P, C J P, a n d C P N
Ye s
No
Ye s
No
Not related to
problem.
#00DC(220)
PLC Setup setting error occurred.
Value of A406
(location of setting
error)?
PLC Setup written
from Programming
Console?
The CPU processing mode is set to
Peripheral Servicing Priority Mode, but
the priorities have not been set
correctly.
The setting indicated by the contents
of A406 is illegal. Check the setting
from a Programming Console.
A communications error may have occurred
during data transfer from the CX-
Programmer. Retransfer the PLC Setup.
Ye s
No
Other
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