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MELSEC-Q
11 TROUBLESHOOTING
Protocol
Error code
(Hexa-
decimal)
Error Description
Signal
name
Corrective action
MC
Non
Proce-
dure
Bidire-
ctional
Pre-
defined
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.
7166H System error
• The OS of the Q series C24 detected
some error.
⎯ (1)
7167H
• 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.
7168H
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.
7169H 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
716B
H
System error
• The OS of the Q series C24 detected
some error.
⎯ (
1)
• The Q series C24 used is not
compatible with the Built-in Ethernet
port QCPU.
• To use a Built-in Ethernet port QCPU,
use a Q series C24 of function version
B or later, and the first 5 digits of its
serial No. must be 10042 or greater.
716CH System error
• The OS of the Q series C24 detected
some error.
⎯
( 1)
716DH
• Monitor data was not written using QnA
compatible 2C/3C/4C frame.
PRO
716EH
Monitor data write
error
• Monitor data was not written using A
compatible 1C frame.
PRO
• Rewrite monitor data.
716FH Device error
• A nonexistent device was designated.
• Device that cannot be specified by the
corresponding command was
designated.
PRO
• Check and correct the external device
transmit message and restart data
communications.
7170H
• Number of access points exceeded the
range.
PRO
7171H
• A device that cannot be designated was
designated.
PRO
7172H
A compatible 1C
frame error
• Written number of monitoring points is
incorrect. For example, [0] was
designated.
PRO
• Check and correct the external device
transmit message and restart data
communications.
7173H
Monitor data write
error
• Monitor data was written for a CPU
other than a Q/QnACPU using QnA
compatible 2C/3C/4C frame.
PRO
• Write the monitor data and use the A
compatible 1C frame to a CPU other
than a Q/QnACPU.
7D00H
Protocol No. setting
error
• In control data of the CPRTCL
instruction, the specified protocol No. is
out of range.
CHn
ERR.
• Correct the protocol No. setting.
7D01H
Continuous protocol
execution count
setting error
• The number of protocols to be executed
continuously, which is specified with an
argument in the CPRTCL instruction, is
out of range.
CHn
ERR.
• Correct the value set for the number of
protocols to be executed continuously.
7D02H
Protocol not-ready
error
• The protocol was executed while Pre-
defined protocol ready (X1D) is OFF.
• The CPRTCL instruction was executed
during protocol setting data writing.
• The CPRTCL instruction was executed
with abnormal protocol setting data.
CHn
ERR.
• Confirm Pre-defined protocol ready
(X1D) turned ON before executing the
CPRTCL instruction.
• To prevent concurrent execution of the
CPRTCL instruction, set the CPU to
STOP before writing the protocol setting
data.
• Write the protocol setting data again to
the Q series C24N, and then execute
the CPRTCL instruction.
• If this error persists even after rewriting,
replace the module.
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