Mitsubishi Electric MELSEC iQ-R Series User Manual page 490

Error code Error
(hexadecima
l)
7FE7H Remote password
error
7FE8H Remote password
error
7FE9H Modem function
error
7FECH Module extended
parameters do
not exist.
7FEDH Simultaneous
execution error
7FEFH Parameter setting
error
7FF0H Dedicated
instructions
simultaneous
execution error
7FF1H Control data error
7FF2H Communication
protocol setting
error
7FF3H to System error
7FF4H
7FF5H Transmission
cancel at mode
switching/
transmission
sequence
initialization
7FF7H Simultaneous
access error
7FFBH Channel error
27 TROUBLESHOOTING
488
27.4 Error Code List
Description Signal
name

• The remote password is
not registered.
• The remote password
processing command was
received on the interface
side where the modem
function is not used.
• The MELSOFT
Connection is selected in
the Communication
protocol setting for the
corresponding channel.
• The number of remote CHn
password mismatch ERR.
exceeded the designated
value of the address
200DH.
• The number of callback CHn
denial exceeded the ERR.
designated value of
address 2002H.

Reading data has failed
since module extended
parameters do not exist.
• More than one target CHn
device accessed to the ERR.
parameter file at the same
time.
• The parameter settings CHn
with MELSOFT are ERR.
incorrect.
• Dedicated instructions 
were executed
simultaneously.

• Setting value is incorrect.
• Setting value is out of the
range.

• The instruction cannot be
executed with the current
communication protocol.

• The operating system of
C24 detected some error.
■The processing in 
operation was cancelled due
to performance of the
following functions:
• Mode switching,
transmission sequence
initialization, receive data
clear (by buffer memory),
user frame use enable/
disable designation, UINI
instruction, programmable
controller CPU
information clear

• Multiple target devices
accessed to a station on
the same network at the
same time.

• Incorrect channel was
designated with a
dedicated instruction.
Corrective action
• A remote password
processing command is not
necessary when a remote
password is not registered.
• Unlock the remote password
by MELSOFT. Alternatively,
change the Communication
protocol setting for the
corresponding channel to MC
protocol.
• Clear the 'accumulated count
of unlock process abnormal
completion' (Un\G8956) to '0'.
• Clear the callback denial
accumulated count (address:
22F1H) to '0'.
• Write module extended
parameters to C24 or CPU
module.
• Do not access to the
parameter file from more than
one target device
simultaneously.
• Correct the parameter
settings, write it to the CPU
module, and restart it.
• Do not execute the dedicated
instructions simultaneously.
• Correct the setting value in the
control data.
• Correct the setting value of
the communication protocol.
Page 490 Corrective actions
for system error
• Do not execute these
functions during various
processes in progress.
• Do not access to a station on
the same network from
multiple target device at the
same time.
• Review the channel for a
dedicated instruction.
Protocol
MC Nonpr Bidire Prede
ocedu ctiona fined
ral l
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