238
(6) Error codes during communication with the serial communication function
The following table lists the error codes (together with their descriptions and corrective actions) sent from the
CPU module to the external device when an error occurs during communication using the serial communication
function.
Error code
(hexadecimal)
Error item Description Corrective action
4000
H
-
Error detected by the CPU module
(error occurred by other than the serial
communication function)
Refer to the following manual and take corrective
action.
QCPU User's Manual (Hardware Design,
Maintenance and Inspection)
to
4FFF
H
7155
H
Unregistered
monitor error
A monitor request was given before monitor
registration.
Give a monitor request after registering a device to be
monitored.
7157
H
Request target
specification
error
A CPU module that does not support the
serial communication function is specified
as a request target module or is in the
specified route.
Check that the transmission message is addressed to
the CPU module that supports the serial
communication function. If not, correct the address
and restart communication.
7164
H
Request data
error
The requested data or device specification
method is incorrect.
Check the sent message/requested data of the
external device, correct it, and restart communication.
7167
H
Disabled during
RUN
A write command was specified while
online change is disabled.
• Enable the online change and restart
communication.
• Set the CPU module to STOP and restart
communication.
7E40
H
Command error
A subcommand or a command that does
not exist is specified.
Check and correct the sent message of the external
device and restart communication.
7E41
H
Data length error
The number of points specified for random
write/read exceeds the number of points
enabled for communication.
Check and correct the sent message of the external
device and restart communication.
7E42
H
Data count error
The requested number of points exceeds
the range of the command.
Check and correct the sent message of the external
device and restart communication.
7E43
H
Device error
The device specified does not exist.
The device specified cannot be specified by
the corresponding command.
Check and correct the sent message of the external
device and restart communication.
7E47
H
Continuous
request error
The next request was received before the
response message was returned.
Do not give continuous requests from the external
device.
Match the monitoring time of timer 1 with the time-out
time of the external device.
7F21
H
Receive header
section error
The command (frame) section specified is
in error.
Check and correct the sent message of the external
device and restart communication.
The ASCII code received cannot be
converted into binary.
7F22
H
Command error
The command or device specified does not
exist.
Check and correct the sent message of the external
device and restart communication.
7F23
H
MC protocol
message error
The data (such as ETX, CR+LF) specified
after the character part does not exist or in
error.
Check and correct the sent message of the external
device and restart communication.
7F24
H
Sumcheck error
The calculated sumcheck does not match
the received sumcheck.
Review the sumcheck of external device.
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