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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.
Error code
Error item
(hexadecimal)
4000 H
to
-
4FFF H
Unregistered
7155 H
monitor error
Request target
7157 H
specification error
7164 H
Request data error
Disabled during
7167 H
RUN
7E40 H
Command error
7E41 H
Data length error
7E42 H
Data count error
7E43 H
Device error
Continuous
7E47 H
request error
Receive header
7F21 H
section error
7F22 H
Command error
MC protocol
7F23 H
message error
7F24 H
Sumcheck error
7F67 H
Overrun error
7F68 H
Framing error
7F69 H
Parity error
Table6.42 Error codes sent from the CPU module to external device
Description
Error detected by the CPU module
(error occurred by other than the serial
communication function)
A monitor request was given before monitor
registration.
Other than the Q00UJCPU, Q00UCPU,
Q01UCPU, and Q02UCPU was selected as a
request module and route.
The requested data or device specification
method is wrong.
A write command was specified while online
change is disabled.
A subcommand or a command that does not exist
is specified.
The number of points specified for random write/
read exceeds the number of points enabled for
communication.
The requested number of points exceeds the
range of the command.
The device specified does not exist.
The device specified cannot be specified by the
corresponding command.
The next request was received before the
response message was returned.
The command (frame) section specified is in error.
The ASCII code received cannot be converted
into binary.
The command or device specified does not exist.
The data (such as ETX, CR+LF) specified after
the character part does not exist or in error.
The calculated sumcheck does not match the
received sumcheck.
The next data was received before the CPU
module completed receive processing.
The stop bit setting does not match.
The parity bit setting does not match.
CHAPTER6 FUNCTIONS
Corrective action
Refer to the QCPU Userís Manual (Hardware Design,
Maintenance and Inspection), and take corrective action.
Give a monitor request after registering a device to be
monitored.
Check that the transmission message address is Q00UJCPU,
Q00UCPU, Q01UCPU, Q02UCPU, modify the setting and
communicate again.
Check the sent message/requested data of the external
device, correct it, and restart communication.
Enable the online change and restart communication.
Check and correct the sent message of the external device
and restart communication.
Check and correct the sent message of the external device
and restart communication.
Check and correct the sent message of the external device
and restart communication.
Check and correct the sent message of the external device
and restart communication.
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.
Check and correct the sent message of the external device
and restart communication.
Check and correct the sent message of the external device
and restart communication.
Check and correct the sent message of the external device
and restart communication.
Review the sumcheck of external device.
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.
Match the setting of the CPU module with that of the external
device.
Match the setting of the CPU module with that of the external
device.
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