CHAPTER6 FUNCTIONS
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6.23 Ser
ial Commu
nication Function
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127
(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
4000H
-
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
4FFFH
7155H
Unregistered
monitor error
A monitor request was given before monitor
registration.
Give a monitor request after registering a device to be
monitored.
7157H
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.
7164H
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.
7167H
Disabled during
RUN
A write command was specified while online
change is disabled.
Enable the online change and restart communication.
7E40H
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.
7E41H
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.
7E42H
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.
7E43H
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.
7E47H
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.
7F21H
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.
7F22H
Command error
The command or device specified does not exist.
Check and correct the sent message of the external device
and restart communication.
7F23H
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.
7F24H
Sumcheck error
The calculated sumcheck does not match the
received sumcheck.
Review the sumcheck of external device.
7F67H
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.
7F68H
Framing error
The stop bit setting does not match.
Match the setting of the CPU module with that of the external
device.
7F69H
Parity error
The parity bit setting does not match.
Match the setting of the CPU module with that of the external
device.
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