27 TROUBLESHOOTING
27.4 Error Code List
475
27
714AH
*1
Cannot execute a
command during
RUN
• A write command was
designated when the
'Online change' is
disabled.
• Parameter or program
was written during RUN.
C/N • Change the setting to enable
the 'Online change' and restart
data communications.
• Stop the CPU module and
restart data communications.
714DH Unusable
command error
• An unsupported
command is requested to
the access target CPU
module.
C/N • Check and correct the
transmission message from
the target device and restart
data communications.
• If no error is found in the
command, clear the
programmable controller CPU
information and retry.
714EH Monitor network
No. error
• The registered monitor
network number and the
network number in the
monitor request are
different.
C/N • Check and correct the other
station access valid module
No. in the network
parameters, and restart data
communications.
• Perform the monitor
registration again.
7150H System error • The operating system of
C24 detected some error.
Page 490 Corrective actions
for system error
7151H PC No.
designation error
• A PC No. other than "FF"
or "0 to 120 (00H to 78H)"
was designated.
C/N • Check and correct the
transmission message from
the target device and restart
data communications.
7153H Frame length
error
• The request exceeded the
limit of processing points
that are predetermined for
each command and
allowed for one
transmission.
CHn
ERR.
• 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.
7155H Monitor
unregistration
error
• Monitoring was requested
before the monitor
registration has been
performed.
PRO • Register the device to be
monitored before issuing a
monitor request.
7156H System error • The operating system of
C24 detected some error.
Page 490 Corrective actions
for system error
7160H PLC access error • CPU model cannot be
confirmed.
C/N • If the CPU module has an
error, remove the CPU module
error and restart data
communications.
7161H System error • The operating system of
C24 detected some error.
Page 490 Corrective actions
for system error
7164H Request error • The request contents or
the device designation
method is incorrect.
• Check and correct the
transmission message/
request from the target device,
and restart data
communications.
7167H Cannot execute a
command during
RUN
•
A write command was
designated when the
Online change is disabled.
C/N • Change the setting to enable
the online change and restart
data communications.
• Stop the CPU module and
restart data communications.
7168H Cannot execute a
command during
RUN
• A command that cannot
be executed during RUN
was designated.
C/N • Stop the CPU module and
restart data communications.
Error code
(hexadecima
l)
Error Description Signal
name
Corrective action Protocol
MC Nonpr
ocedu
ral
Bidire
ctiona
l
Prede
fined
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