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MELSEC-Q
11 TROUBLESHOOTING
11.2.2 A compatible 1C frame communications error code table
The following table lists the error code, error contents, and corrective action for errors
generated during A compatible 1C frame communications.
Protocol
Error code
(Hexa-
decimal)
Error
Error Contents
Signal
name
Corrective action
MC
Non
Proce-
dure
Bidire-
ctional
Pre-
defined
00H Disable during RUN
• A write command was designated when
"Disable write during RUN" was set.
• Parameter or sequence program was
written during RUN.
C/N
• Change the setting to "Enable write
during RUN" and restart data
communications.
• Stop the CPU and restart data
communications.
01H Parity error
• The data does not match the parity bit
setting.
P/S
• Match the Q series C24 and external
device settings.
02H Sum check error
• The sum check calculated by the Q
series C24 and the transmitted sum
check are not the same.
P/S • Check the external device sum check.
03H Protocol error
• Received message that is different from
the control procedure with the
communication protocol setting.
PRO
• Check and correct the external device
transmit message and restart data
communications.
04H Framing error
• The data does not match the stop bit
setting.
SIO
• Match the Q series C24 and external
device settings.
05H Overrun error
• The next data was received before the
Q series C24 received all the preceding
data.
SIO
• Decrease the transmission rate and restart
data communications.
06H Character area error
• Designation method error in part of a
message.
• A command that does not exist was
designated.
• The number of processing points is
outside the range for the command.
• A device that does not exist was
designated.
PRO
07H Character error • Received data that cannot be used. PRO
• Check and correct the external device
transmit message and restart data
transmission.
08H
Programmable
controller access
error
• The CPU cannot communicate with the
Q series C24.
C/N
• Replace the CPU with a CPU that can
communicate with the Q series C24.
10H PC No. error
• The PC No. is not "FF", or a station No.
set in the network parameters.
C/N
• Check and correct the external device
transmit message and restart data
communications.
11H Mode error
• An error was detected upon access to
the programmable controller CPU.
⎯
• Send again.
• Conduct individual station recovery test
and check the Q series C24.
12H
Special function
module designation
error
• A special function module does not
exist at the specified position.
C/N
• Check and correct the external device
transmit message and restart data
communications.
21H
Special function
module bus error
• An error was detected upon access to a
special function module at the specified
position.
C/N
• Check the error and take corrective action
according to the manual of the
corresponding module.
42H Other errors
See POINT .
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