Mitsubishi Electric MELSEC-Q Series User Manual page 144

7 FUNCTION
Error Code
Error Item
(Hexadecimal)
7F22H Command error
MC protocol
7F23H
message error
7F24H Sum check error
7F67H Overrun error
7F69H Parity error
7F6AH Buffer full error

F000H
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Error Definition
• The command or device specified does
not exist.
• The remote password length is in error.
• The data (e.g. ETX, CR-LF) specified
after the character part does not exist
or in error.
• The calculated sum check does not
match the received sum check.
• The next data was received before the
Q00CPU or Q01CPU completed
receive processing.
• The parity bit setting does not match.
• The receive buffer of the OS overflew,
resulting in skipped receive data.
• Error detected by the MELSECNET/H
network system.
Corrective Action
• 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.
• Reconsider the sum check of the device on
the other end.
• Reduce the communication speed and
restart communication.
• Check the Q00CPU or Q01CPU for
occurrence of an instantaneous power
failure.
(For the Q00CPU or Q01CPU, use the
special register SD53 to check.)
When an instantaneous power failure has
occurred, remove its cause.
• Match the setting of the Q00CPU or
Q01CPU with that of the device on the other
end.
• Exercise DTR control to make
communication, preventing a buffer full
error.
• Refer to the Q Corresponding
MELSECNET/H Reference Manual (PLC to
PLC Network) and take corrective action.
MELSEC-Q
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