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10 TROUBLESHOOTING
10.2.2 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
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
PLC 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
PLC No. error
•
The PLC 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 PLC
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 .
POINT
•
If an error occurs during A compatible 1C frame communications, the Q series C24
adds a 2-character error code (00
H
to 10
H
, 42
H
) to the "NAK" code and returns the
"NAK" code to the external device and stores the error code (equivalent to QnA
compatible 2C/3C/4C frame error code) to buffer memory address 25A
H
(CH1) or
26A
H
(CH2).
The exact error contents can be checked by reading the value stored to the
buffer memory.
See Section 10.2.1 for a detailed description of the error codes.