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CHAPTER6 FUNCTIONS
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6.23 Serial Communication Function
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(7) Error codes during communication with the serial communication function
Table6.42 shows the error codes, error description, and corrective actions sent from the CPU module to the
external device when an error occurs during communication with the serial communication function.
Table6.42 Error codes sent from the CPU module to external device
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 QCPU Userís Manual (Hardware Design,
Maintenance and Inspection), and take corrective action.
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
Other than the Q00UJCPU, Q00UCPU,
Q01UCPU, and Q02UCPU was selected as a
request module and route.
Check that the transmission message address is Q00UJCPU,
Q00UCPU, Q01UCPU, Q02UCPU, modify the setting and
communicate again.
7164
H
Request data error
The requested data or device specification
method is wrong.
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.
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.
7F67
H
Overrun error
The next data was received before the CPU
module completed receive processing.
Reduce the communication speed and restart communication.
Check the CPU module for momentary power failure.
(For the CPU module, use the special register SD53 to check.)
When an momentary power failure occurs, remove its cause.
7F68
H
Framing error The stop bit setting does not match.
Match the setting of the CPU module with that of the external
device.
7F69
H
Parity error The parity bit setting does not match.
Match the setting of the CPU module with that of the external
device.