Mitsubishi Electric MELSEC-Q Series User Manual page 143

7 FUNCTION
Error Code
Error Item
(Hexadecimal)
4000H

to
4FFFH
Frame length
7153H
error
Unregistered
7155H
monitor error
Requested data
7164H
error
7167H
Disabled during
RUN
7168H
Monitor
716DH
registration error
7E40H Command error
7E41H Data length error
7E42H Data count error
7E43H Device error
Continuous
7E47H
request error
Device point
7E4FH
count error
Request
destination
7E5FH
module I/O
number error
Registered point
7E64H
count range error
7F01H Buffer full error
Receive header
7F21H
section error
7 - 47
(6) Error codes for communication made using serial communication
function
The following table indicates the error codes, error definitions and corrective
actions that are sent from the Q00CPU or Q01CPU to the external device when
errors occur during communication made using the serial communication
function.
Error Definition
(CPU detected error)
Error that occurred in other than the
serial communication function
• The length of the received message is
outside the permissible range.
• A monitor request was given before
monitor registration was made.
• The requested data or device
specifying method is in error.
• A write command was specified for the
setting of write during RUN disable.
• The command specified cannot be
executed during RUN.
• The QnA-compatible 3C/4C frame was
not used for monitor registration.
• The command or sub-command
specified does not exist.
• The number of points specified for
random read/write 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 for the corresponding
command.
• The next request was received before
the reply message was returned.
• The number of access points is
incorrect.
• The request destination module I/O
number is in error.
• The number of registered points
(word/bit) is outside the range.
• The next data was received before
completion of received data
processing.
• The command (frame) section specified
is in error.
• The ASCII code received cannot be
converted into binary.
Corrective Action
• Refer to the Appendices of the Basic Model
QCPU (Q Mode) User's Manual (Hardware
Design, Maintenance and Inspection), and
take corrective action.
• Reconsider the sent message.
• The number of access points of the
message should be within the permissible
range.
• Give a monitor request after registering the
device to be monitored.
• Check and correct the sent
message/requested data of the device on
the other end, and restart communication.
• Change the setting to write during RUN
enable and restart communication.
• Set the CPU module to STOP and restart
communication.
• Perform monitor registration again.
• Check and correct the sent message of the
device on the other end and restart
communication.
• Check and correct the sent message of the
device on the other end and restart
communication.
• Check and correct the sent message of the
device on the other end and restart
communication.
• Check and correct the sent message of the
device on the other end and restart
communication.
• Do not give continuous requests from the
device on the other end.
• Match the monitoring time of timer 1 with the
time-out period of the device on the other
end.
• Check and correct the sent message of the
device on the other end and restart
communication.
• Correct the module I/O number of the data
send destination.
• Correct the set value of the registered points
(word/bit).
• Perform handshake with the device on the
other end, for example, to increase the
sending intervals.
• Check and correct the sent message of the
device on the other end and restart
communication.
MELSEC-Q
7 - 47