Mitsubishi Electric MELSEC iQ-R Series User Manual page 481

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