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MELSEC-Q
9 TROUBLESHOOTING
(3) when the error-detected node number (lower byte of error information) is other
than FF
H
and FE
H
Detection time period
Error
code
(HEX.)
Error detection Description Corrective action
Master
function
Slave
function
01
H
QJ71DN91
A network problem was detected after
communication was started.
• Check that the cable is connected correctly.
1E
H
QJ71DN91
Slave node did not respond.
• Check the entire network and slave node
statuses such as whether or not the MAC ID
and baud rate are set correctly, a slave node is
down, or a terminal resistor is disconnected.
20
H
Slave node
Slave node responded with a non-prescribed
error.
• Read the communication error information, and
take an appropriate action according to the
error information.
23
H
Slave node
Slave node responded with an error when
establishing a connection.
• Read the communication error information, and
take an appropriate action according to the
error information.
24
H
QJ71DN91
The input data size of a parameter is different
from the size of the actual slave node.
• Check the slave node manual and set the
correct input data size.
25
H
QJ71DN91
The output data size of a parameter is different
from the size of the actual slave node.
• Check the slave node manual and set the
correct output data size.
26
H
QJ71DN91
Response data of a function that is not supported
by the QJ71DN91 was received.
• Check the slave node manual, and change the
setting so that any data of functions not
supported by the QJ71DN91 will not be sent by
the slave node.
• Check the entire network and slave node
statuses such as whether or not a terminal
resistor is disconnected.
27
H
Slave node
The connection is set to the mode that was
already specified.
• Check the entire network and slave node
statuses such as whether or not a terminal
resistor is disconnected.
28
H
QJ71DN91
Unexpected invalid data was received when
establishing a connection.
• Check the entire network and slave node
statuses such as whether or not a terminal
resistor is disconnected.
29
H
Slave node
Connection has already been established with
that slave node.
• Wait a while, and reset the slave node if the
connection cannot be established.
2A
H
QJ71DN91
The data length of a polling response is different
from the data length read from the slave node
when establishing a connection.
• Check the entire network and slave node
statuses such as whether or not a terminal
resistor is disconnected.
2B
H
QJ71DN91
The first division data was received twice in the
division reception of a polling response.
• Check the entire network and slave node
statuses such as whether or not a terminal
resistor is disconnected.
2C
H
QJ71DN91
The received division data number is different
from the expected number in the division
reception of a polling response.
• Check the entire network and slave node
statuses such as whether or not a terminal
resistor is disconnected.
2D
H
QJ71DN91
Intermediate data or last data was received
before receiving the first division data in the
division reception of a polling response.
• Check the entire network and slave node
statuses such as whether or not a terminal
resistor is disconnected.
3B
H
QJ71DN91
Two or more identical node numbers (MAC IDs)
were detected in parameters.
• Two or more slave nodes having the same
node number are set in the parameters. Set the
correct node numbers.
• A slave node having the same node number as
that of the local node exists in the parameters.
47
H
QJ71DN91
Incorrect connection type was specified.
• Check that the connection type value is correct.
• Read the communication error information, and
take an appropriate action according to the
error information.
80
H
QJ71DN91
Timeout occurred during the polling connection of
the slave function.
• Check the entire network and slave node
statuses such as whether or not a terminal
resistor is disconnected.
• Check the master node status.
81
H
QJ71DN91
A connection other than explicit messages and
polling was allocated.
• Do not allocate I/O connections other than
polling.
82
H
QJ71DN91
The number of reception bytes of polling is
greater than the maximum number of reception
points.
• Match the I/O point setting of the master node
with that of the QJ71DN91.