Mitsubishi Electric QJ71DN91 User Manual page 193

9 TROUBLESHOOTING
Error
Detected
code
in:
(Hex.)
Two or more identical node numbers
3B QJ71DN91
H
(MAC IDs) were detected in parameters.
47 QJ71DN91 Incorrect connection type was specified.
H
The polling connection in the slave
80 QJ71DN91
H
function has timed out.
A connection other than for explicit
81 QJ71DN91
H
messages and polling was allocated.
The number of bytes received by polling
82 QJ71DN91 is greater than the max. number of
H
receive points.
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Description Action
• The same node No. is set for two or more
slave nodes. Correct the duplicated
parameter settings.
• A slave node having the same node No.
as that of this node exists in the
parameters.
• Check if the connection type value is
correct.
• Read the communication error
information, and take appropriate actions.
• Check the entire network and slave node
states for any fault such as disconnection
of a terminating resistor.
• Check the master node status.
• Do not allocate any I/O connection other
than for polling.
• Set the master node's I/O points that
match the settings of the QJ71DN91.
MELSEC-Q
Detectability
Master Slave
function function
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