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MELSEC-Q
10 TROUBLESHOOTING
Protocol
Error code
(Hexa-
decimal)
Error
Error Contents
Signal
name
Corrective action
MC
Non
Proce-
dure
Bidire-
ctional
7148
H
Extension R block
No. error
• A nonexistent extension file register block No. was
designated.
• A block No. being used as an extension comment
area, sampling trace area, or status latch area was
designated.
PRO
• Correct the designated block
No. and restart data
communications.
7149H System error • The OS of the Q series C24 detected some error. — ( 1)
714AH
Cannot execute a
command during
RUN
• A write command was designated when "Disable
write during RUN" was set.
• Parameter or sequence program was written during
RUN.
C/N
• Change the setting to "Enable
write during RUN" and restart
data communications.
• Stop the CPU and restart data
communications.
714BH
to
714D
H
System error • The OS of the Q series C24 detected some error. — ( 1)
714E
H
Monitor network
No. error
• The written monitor network No. and the monitor
request network No. are different.
C/N
• Check and correct the other
station access valid module No.
in the network parameters.
• Rewrite the monitor data.
7150H System error • The OS of the Q series C24 detected some error. — ( 1)
7151
H
PLC No.
designation error
• A PLC No. other than "FF" or "0 to 64(00
H
to 40
H
)"
was designated.
C/N
• Check and correct the external
device transmit message and
restart data communications.
7152H System error • The OS of the Q series C24 detected some error. — ( 1)
7153H Frame length error
• The received message length has exceeded the
allowable range.
CHn
ERR.
• Review the transmission
message.
• Correct the message format so
the number of access points is
within the allowable range.
7154
H
System error • The OS of the Q series C24 detected some error. — ( 1)
7155
H
Unwritten monitor
data error
• Monitoring was requested before monitor data was
written.
PRO
• Write the device to be monitored
before issuing a monitor
request.
7156
H
System error • The OS of the Q series C24 detected some error. — ( 1)
7160H PLC access error • CPU model name cannot be confirmed. C/N
• If there is an error in the CPU,
remove the CPU error and
restart data communications.
7161H
to
7163
H
System error • The OS of the Q series C24 detected some error. — ( 1)
7164H Request error
• Either the request or the device designation method
is wrong.
• Check the transmission
message/request from the
external device, make the
necessary corrections, and send
again.
7166
H
System error • The OS of the Q series C24 detected some error. — ( 1)
7167
H
• A write command was designated when "Disable
write during RUN" was set.
C/N
• Change the setting to "Enable
write during RUN" and restart
data communications.
7168
H
Cannot execute a
command during
RUN
• A command that cannot be executed during RUN
was designated.
C/N
• Stop the CPU and restart data
communications.
7169
H
CPU error • Cannot communicate normally with the CPU. C/N
• If there is an error in the CPU,
remove the CPU error and
restart data communications.
716AH
to
716C
H
System error • The OS of the Q series C24 detected some error. — ( 1)
716D
H
• Monitor data was not written using QnA compatible
2C/3C/4C frame.
PRO
716E
H
Monitor data write
error
• Monitor data was not written using A compatible 1C
frame.
PRO
• Rewrite monitor data.