KEYENCE Visual KV Series - Manual (Page 404)

10.4 Error Messages
Chapter 10 Troubleshooting
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10
10.4 Error Messages
Set the mode switch on the Handheld Programmer to PROGRAM mode, and press
CLEAR to clear the error message shown on the display. After clearing the error
message, take the following procedures to remove the cause of the error.
Error message Cause Remedy
CPU ERROR Hardware error on KV-300 CPU Turn power to KV-300 CPU OFF
and then ON again.If error
message remains, unit may be
defective. Contact nearest
KEYENCE office.
NO PROGRAM Attempt was made to operate
KV-300 CPU with no program
stored. Write a program into the KV-300
CPU.
SCAN TIME
ERROR Scan time exceeds 300 ms. Check the program for the
following:
• Check that there are no
excessive repetitions of FOR-
NEXT.
• Check that interrupt is not
executed at high speed.
MEMORY
ERASED Content of RAM was erased. All
data in data memory and current
values of counters in KV-300
CPU were cleared. Check DM values and current
counter values.
CALL NEST
ERROR Subroutines are nested to four
levels or more.
➮ Refer to page 3-122.
These errors occur when
program is executed.
Check program while paying
particular attention to subrou-
tines and INT instruction.
FOR NEST
ERROR FOR-NEXT instruction set is
nested to eight levels or more.
➮ Refer to page 3-125.
INT NEST ERROR Interrupts of five levels or more
occurred.
➮ Refer to page 3-192.
MPS NEST
ERROR MPS/MPP instruction set is
nested to eight levels or more.
➮ Refer to page 3-103.
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