A Compatible 1C Frame Communications Error Code List - Mitsubishi Melsec-L Series User Manual

15.2.3 A compatible 1C frame communications error code list

Error code
Error
(Hexa-
decimal)
00 Disable during RUN
H
01 Parity error
H
02 Sum check error
H
03 Protocol error
H
04 Framing error
H
05 Overrun error
H
06 Character area error
H
07 Character error
H
Programmable
08 controller access
H
error
10 PC No. error
H
11 Mode error
H
Special function
12 module designation
H
error
Special function
21
H
module bus error
42 Other errors
H
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The following table lists the error code, error contents, and corrective action for errors
generated during A compatible 1C frame communications.
Error Contents
• A write command was designated when
disable online change was set.
• Parameter or sequence program was
written during RUN.
• The data does not match the parity bit
setting.
• The sum check calculated by the C24
and the transmitted sum check are not
the same.
• Received message that is different from
the control procedure with the
communication protocol setting.
• The data does not match the stop bit
setting.
• The next data was received before the
C24 received all the preceding data.
• 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.
• Received data that cannot be used.
• The CPU module cannot communicate
with the C24.
• The PC No. is not "FF", or a station No.
set in the network parameters.
• An error was detected upon access to
the CPU module.
• A special function module does not
exist at the specified position.
• An error was detected upon access to a
special function module at the specified
position.
POINT
• If an error occurs during A compatible 1C frame communications, the C24 adds a 2-
character error code (00
to the external device and stores the error code (equivalent to QnA compatible
2C/3C/4C frame error code) to buffer memory address 25A
The exact error contents can be checked by reading the value stored to the
buffer memory.
Refer to Section 15.2 for a detailed description of the error codes.
Signal
Corrective action
name
• Change the setting to enable online
change and restart data
C/N communications.
• Stop the CPU and restart data
communications.
• Match the C24 and external device
P/S
settings.
P/S • Check the external device sum check.
• Check and correct the external device
PRO. transmit message and restart data
communications.
• Match the C24 and external device
SIO
settings.
• Decrease the transmission rate and
SIO
restart data communications.
• Check and correct the external device
PRO.
transmit message and restart data
transmission.
PRO.
• Replace the CPU module with a CPU
C/N module that can communicate with the
C24.
• Check and correct the external device
C/N transmit message and restart data
communications.
• Send again.
⎯ • Conduct Self-loopback test and check the
C24.
• Check and correct the external device
C/N transmit message and restart data
communications.
• Check the error and take corrective action
C/N according to the manual of the
corresponding module.
Refer to POINT .
to 10 , 42 ) to the "NAK" code and returns the "NAK" code
H H H
15 TROUBLESHOOTING
Protocol
Non- Bi-
proce- direc-
MC
defined
dural tional
(CH1) or 26A (CH2).
H H
15 - 31
Pre-