Mitsubishi Electric QJ71DN91 User Manual page 209

10 TROUBLESHOOTING
Error
Detected
code
in:
(Hex.)
A network problem was detected after
01 QJ71DN91
H
communication was started.
1E QJ71DN91 The slave node did not respond.
H
A slave node responded with a non-
20 Slave node
H
prescribed error.
A slave node responded with an error
23 Slave node
H
when establishing a connection.
The input data size set with a parameter
24 QJ71DN91 is different from the size for the actual
H
slave node.
The output data size set with a
25 QJ71DN91 parameter is different from the size for
H
the actual slave node.
Response data of the function that is not
26 QJ71DN91 supported by the QJ71DN91 was
H
received.
The connection is already in the
27 Slave node
H
specified mode.
Unexpected invalid data was received
28 QJ71DN91
H
when the connection was established.
Connection has already been
29 Slave node
H
established with that slave node.
The data length of a polling response is
different from the length of the data that
2A QJ71DN91
H
was read from the slave node when a
connection was established.
When a polling response was divided
2B QJ71DN91 into several data units, the first data unit
H
was received twice.
When a polling response was divided
2C QJ71DN91 into several data blocks, data of an
H
unexpected number was received.
When a polling response was divided
into several data blocks, the second data
2D QJ71DN91
H
block or later was received before the
first one.
10 - 11
(3) When the error-detected node No. (low byte of error information) is other than
FF and FE
H H
Description Action
• Check that the cables are connected
correctly.
• Check the entire network and slave node
states for MAC ID and baud rate setting,
a failed slave node, or disconnection of a
terminating resistor.
• Read the communication error
information, and take an appropriate
action according to the error information.
• Read the communication error
information, and take an appropriate
action according to the error information.
• Check the slave node manual and set the
correct input data size.
• Check the slave node manual and set the
correct output data size.
• Check the slave node manual, and
prevent any data of the function not
supported by the QJ71DN91 from being
sent from the slave node.
• Check the entire network and slave node
states for any fault such as disconnection
of a terminating resistor.
• Check the entire network and slave node
states for any fault such as disconnection
of a terminating resistor.
• Check the entire network and slave node
states for any fault such as disconnection
of a terminating resistor.
• Wait for a while, and reset the slave node
if the connection cannot be established.
• Check the entire network and slave node
states for any fault such as disconnection
of a terminating resistor.
• Check the entire network and slave node
states for any fault such as disconnection
of a terminating resistor.
• Check the entire network and slave node
states for any fault such as disconnection
of a terminating resistor.
• Check the entire network and slave node
states for any fault such as disconnection
of a terminating resistor.
MELSEC-Q
Detectability
Master Slave
function function
10 - 11