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CHAPTER6 FUNCTIONS
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6.24 Ser
ial Commu
nication Function
(7) Error codes during communication with the serial communication function
Table6.45 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.
(To the next page)
Table6.45 Error codes sent from the CPU module to external device
Error code
(Hexadeci-
mal)
Error item
Description
Corrective action
4000
H
to
4FFF
H
-
Error detected by the CPU module (error occurred by other
than the serial communication function)
Refer to the QCPU User's Manual (Hardware Design,
Maintenance and Inspection), and take corrective action.
7153
H
Frame length
error
The length of received message is outside the permissible
range.
Review the sent message.
Modify the message so that the number of access points
may be within the permissible range.
7155
H
Unregistered
monitor error
A monitor request was given before monitor registration.
Give a monitor request after registering a device to be
monitored..
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.
• Set the CPU module to STOP and restart
communication.
7168
H
The selected command cannot be executed in the RUN
status.
Set the CPU module to STOP and restart
communication.
716D
H
Monitor
registration error
The QnA-compatible 3C/4C frame was not used for monitor
registration.
Perform the monitor registration again.
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.
7E4F
H
Number of
device points
error
The number of access points is incorrect.
Check and correct the sent message of the external
device and restart communication.
7E5F
H
Request
destination
module I/O
number error
The I/O number of the request destination module is error.
Correct the I/O number of the module to which data are
sent.
7E64
H
Number of
registration
points range
error
The number of registration points (word/bit) is outside the
range.
Correct the setting value of the number of registration
points (word/bit).
7F01
H
Buffer full error
The next data was received before processing received data.
Increase the transmission intervals by such as
handshake with 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.