Mitsubishi Electric QJ71DN91, User Manual

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