Mitsubishi 00JCPU User Manual page 322

Table6.45 Error codes sent from the CPU module to external device (continued)
Error code
(Hexadeci- Error item
mal)
7F24 Sumcheck error
H
7F67 Overrun error
H
7F69 Parity error
H
7F6A Buffer full error
H
-
F
H
6 - 142
Description
The calculated sumcheck does not match the received
sumcheck.
The next data was received before the CPU module
completed receive processing.
• The parity bit setting does not match.
• Communication line became unstable by powering on/off
the target device.
• Noise is generated on the communication line.
The receive buffer of the OS overflew and the received data
was skipped.
Error detected by the MELSECNET/H network system
Corrective action
Review the sumcheck of external device..
Reduce the communication speed and restart
communication.
Check the CPU module for momentary power failure.
(For the CPU module, use the special register SD53 to
check.)
When an momentary power failure occurs, remove its
cause.
• Match the setting of the CPU module with that of the
external device.
• Take noise reduction measures.
Perform DTR control and make communication to
prevent a buffer full error.
Check and correct the sent message of the external
device and restart communication.
(The station number may not be set. Communication
with other stations via MELSECNET/H and Ethernet is
not made.)