Mitsubishi MELSEC QJ71C24, User Manual

Page: 346 / 442

11 - 30 11 - 30
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
00
H
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.
01
H
Parity error
•
The data does not match the parity bit
setting.
P/S
•
Match the Q series C24 and external
device settings.
02
H
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.
03
H
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.
04
H
Framing error
•
The data does not match the stop bit
setting.
SIO
•
Match the Q series C24 and external
device settings.
05
H
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.
06
H
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
07
H
Character error
•
Received data that cannot be used. PRO
•
Check and correct the external device
transmit message and restart data
transmission.
08
H
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.
10
H
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.
11
H
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.
12
H
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.
21
H
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.
42
H
Other errors
See POINT .