Mitsubishi Q00JCPU User Manual page 397

6
FUNCTIONS
Table6.49 List of error codes sent from CPU module to external device (Continued)
Error Code
Error Item
(Hexadecimal)
7F22 Command error
H
MC protocol
7F23
H
message error
7F24 Sum check error
H
7F67 Overrun error
H
7F69 Parity error
H
7F6A Buffer full error
H
------
F
H
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 CPU
module 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 CPU module for occurrence of an
instantaneous power failure. (For the CPU module,
use the special register SD53 to check.)
When an instantaneous power failure has occurred,
remove its cause.
• Match the setting of the CPU module with that of the
device on the other end.
• Exercise DTR control to make communication,
preventing a buffer full error.
• Check the send message of the device on the other
end, make corrections and retry.
(The station number may have been specified.
Communication with stations on other than
MELSECNET/H or Ethernet is not available.)
6.24 Serial Communication Function
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