476
27 TROUBLESHOOTING
27.4 Error Code List
7169H CPU error • Communication with the
CPU module cannot be
established normally.
C/N • If the CPU module side has an
error, remove the error and
restart data communications.
716CH System error • The operating system of
C24 detected some error.
Page 490 Corrective actions
for system error
716FH Device error • A nonexistent device was
designated.
• Device that cannot be
specified by the
corresponding command
was designated.
PRO • Check and correct the
transmission message from
the target device and restart
data communications.
7170H 1C frame error • Number of access points
exceeded the range.
PRO • Check and correct the
transmission message from
the target device and restart
data communications.
7171H 1C frame error • A device that cannot be
designated was
designated.
PRO • Check and correct the
transmission message from
the target device and restart
data communications.
7172H 1C frame error • The registered number of
monitoring points is
incorrect. For example, '0'
was designated.
PRO • Check and correct the
transmission message from
the target device and restart
data communications.
7173H Monitor
registration error
• Monitor registration was
performed to a CPU
module other than R/Q/L/
QnACPU using 2C/3C/4C
frame.
PRO • For CPU module other than R/
Q/L/QnACPU, use 1C frame
for monitor registration and
monitor.
7817H Remote password
error
C24 is in the remote
password locked out state.
• Wait for awhile, and retransmit
the password.
7D00H Protocol No.
setting error
• The protocol number is
out of range in the control
data for CPRTCL
instruction.
CHn
ERR.
• Review the protocol number.
7D01H Protocol
continuous
execution count
setting error
• The number of protocols
to be executed
continuously is out of
range in an argument of
the CPRTCL instruction.
CHn
ERR.
• Review the number of
protocols to be executed
continuously.
7D02H Protocol not-
ready error
• The CPRTCL instruction
was executed while the
'predefined protocol
ready' (X1D) is OFF.
• The CPRTCL instruction
was executed while the
protocol setting data is
being written.
• The CPRTCL instruction
was executed with
abnormal protocol setting
data.
CHn
ERR.
• Execute the CPRTCL
instruction after the
'predefined protocol ready'
(X1D) turned ON.
• Do not execute the CPRTCL
instruction while the protocol
setting data is being written.
(
Set the CPU module in STOP
state, and write protocol
setting data.)
• Write the protocol setting data
again to C24, and then
execute the CPRTCL
instruction.
• If this error persists even after
rewriting, replace the module.
7D10H Protocol
unregistration
error
• The protocol No. which is
not registered in C24 is
specified in the control
data for the CPRTCL
instruction.
• The CPRTCL instruction
was executed without the
protocol setting data
written.
CHn
ERR.
• Check if the specified protocol
No. is correct.
• Check the 'Protocol
registration' (Un\G16529 to
16536) to see if the specified
protocol number is registered.
• Write the protocol setting data,
and then execute the
CPRTCL instruction.
Error code
(hexadecima
l)
Error Description Signal
name
Corrective action Protocol
MC Nonpr
ocedu
ral
Bidire
ctiona
l
Prede
fined
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