Download Q Corresponding Serial Communication Module User's Manual

10 TROUBLESHOOTING
MELSEC-Q
Protocol
Error code
(Hexadecimal)
Error
Error Contents
Signal
name
Corrective action
• Read point of monitoring device is out of range.
7E6DH
CPU abnormal
monitoring setting
value error
• Setting value (fixed value) of CPU abnormal
monitoring is out of range.
7E6EH
System error
• The OS of the Q series C24 detected some error.
7E6FH
Modem connection
• Modem is connected to an incorrect channel.
error
7E70H
CPU error
• The communication with the CPU could not be
performed normally.
7E81H
to
7E8EH
System error
• The OS of the Q series C24 detected some error.
—
(
Double send
request error
• A send request was performed while another send
request was being processed.

• Interlock (handshake) the send
requests.

• Make the transmission data
count smaller than the transmit
buffer size.
• Make the non procedure
protocol transmit buffer size
larger.
• Designate the first address and
size of transmission/receipt
buffer in the free area range of
the user.

• When writing to Flash ROM, set
switch shown left of the given
interface to ON and restart the
Q series C24.

• Check the read/write request
data and designate the correct
data.
7E6BH
7E6CH
—
—
—
—
• Correct the setting value (fixed
value) of the CPU abnormal
monitoring.
—
(
—
• Correct the CH to which
notification is sent.
C/N
Non
BidireProcectional
dure
• Correct the setting value of the
read point of the monitoring
device.
Monitoring device
read point range
error
7E6AH
MC
1)
• If there is an error in the CPU,
eliminate the error on the CPU
side and communicate again.
1)
7EC1H
7EC2H
7EC3H
7EC4H
Transmission data
count error
• Data larger than the transmit buffer size was
transmitted.
Transmission/
receipt buffer
• Transmission/receipt buffer settings out of range.
setting error
7EC5H
Flash ROM access
error
7EC6H
Flash ROM access • There is an error in the Flash ROM read/write
error
request contents.
7F00H
System error
7F01H
Buffer full error
• Write to Flash ROM was requested when the setting
modification enable/disable switch in the GX
Developer was set to OFF.
• The OS of the Q series C24 detected some error.
• The next data was received before processing of the
previous data was completed.
• Multiple requests was simultaneously issued for one
channel.
7F02H
to
7F06H
System error
• The OS of the Q series C24 detected some error.
—

( 1)
• Increase the transmission time
by performing handshake with
the external device, etc.
—
(
PRO
PRO
• Check and correct the external
device transmit message and
restart data communications.
7F20 H
ASCII
BIN
conversion error
7F21 H
Receive header
area error
7F22 H
Command error
• A nonexistent command or device was designated.
• The remote password length is wrong.
PRO
7F23 H
MC protocol
message error
• There is no data (ETX, CR-LF, etc.) following the
character area, or designation was incorrect.
PRO
10 - 19
• There is an error in the command (frame) part.
• An ASCII code that cannot be converted to binary
code was received.
1)
• Check and correct the external
device transmit message and
restart data communications.
• When communicating using
ASCII
BIN conversion,
always transmit the data in even
number bytes units.
• An ASCII code that cannot be converted to binary
code was received.
• An odd number of bytes of data was received during
data communications using ASCII
BIN
conversion.
• Perform handshake with the
request source external device.
• Check and correct the external
device transmit message and
restart data communications.
• Check and correct the external
device transmit message and
restart data communications.
10 - 19