27 TROUBLESHOOTING
27.4 Error Code List
479
27
7D21H Decimal point
place
specification error
• An out-of-range decimal
point position is set when
the number of decimals is
set to Variable point.
• The number of decimals is
larger than the number of
digits for each data.
CHn
ERR.
• Correct the decimal point
position.
• Check the number of digits
setting, and set the decimal
point position so that the
number of decimals is less
than the number of digits.
7E01H System error • The operating system of
C24 detected some error.
Page 490 Corrective actions
for system error
7E03H to
7E05H
System error • The operating system of
C24 detected some error.
Page 490 Corrective actions
for system error
7E07H System error • The operating system of
C24 detected some error.
Page 490 Corrective actions
for system error
7E08H Execution
currently disabled
error
• The UINI instruction was
executed during execution
of the programmable
controller CPU
information clear.
• Execute the UINI instruction
while the programmable
controller CPU information
clear is not executed.
7E09H to
7E0AH
System error • The operating system of
C24 detected some error.
Page 490 Corrective actions
for system error
7E40H Command error • A nonexistent command
or subcommand was
designated.
PRO • Check and correct the
transmission message from
the target device and restart
data communications.
7E41H Data length error • A data length exceeding
the number of points that
can communicate during
random read/write was
designated.
PRO • Check and correct the
transmission message from
the target device and restart
data communications.
7E42H Data count error • Number of processing
points exceeds the range
allowed for the command.
PRO • Modify the setting of the
transmission message from
the target device so that the
request will not exceed the
limit of processing points that
are allowed for one
transmission and
predetermined for each MC
protocol command. Then,
retry data communications.
7E43H Device error • A nonexistent device was
designated.
• Device that cannot be
specified by the
corresponding command
was designated.
• The start device number
is out of range.
PRO • Check and correct the
transmission message from
the target device and restart
data communications.
7E44H Timer 1 time-out
error
• A response message was
not returned within the
response monitoring time
(timer 1).
C/N • Increase the monitoring time
for the response monitoring
time (timer 1).
• When accessing other
station's CPU, check if the
routing parameters are
cor
rect.
7E47H Continuous
request error
• The next request was
received before a
response message was
returned for the preceding
request.
PRO • Do not send requests
continuously from the target
device.
• Adjust the monitoring time for
the response monitoring time
(timer 1) to the timeout time
set for the target device side.
Error code
(hexadecima
l)
Error Description Signal
name
Corrective action Protocol
MC Nonpr
ocedu
ral
Bidire
ctiona
l
Prede
fined
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