6
- 186
6.24 Serial Communication Function
6
FUNCTIONS
Table6.56 List of error codes sent from CPU module to external device (Continued)
Error Code
(Hexadecimal)
Error Item
Error Definition
Corrective Action
7F22
H
Command error
• The command or device specified does not
exist.
• The remote password length is in error.
• Check and correct the sent message of the device
on the other end and restart communication.
7F23
H
MC protocol
message error
• The data (e.g. ETX, CR-LF) specified after
the character part does not exist or in error.
• Check and correct the sent message of the device
on the other end and restart communication.
7F24
H
Sum check error
• The calculated sum check does not match
the received sum check.
• Reconsider the sum check of the device on the
other end.
7F67
H
Overrun error
• The next data was received before the CPU
module completed receive processing.
• 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.
7F69
H
Parity error
• The parity bit setting does not match.
• Match the setting of the CPU module with that of the
device on the other end.
7F6A
H
Buffer full error
• The receive buffer of the OS overflew,
resulting in skipped receive data.
• Exercise DTR control to make communication,
preventing a buffer full error.
F
H
------
• Error detected by the MELSECNET/H
network system.
• 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.)
