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MELSEC-Q
9 TROUBLESHOOTING
9.2 Error Codes
This section explains the contents of error codes and actions to be taken.
Error codes are classified into the communication error codes and the execution error
codes during message communication.
(1) As for the communication error codes, read them when either the master function
for error set signal (X03) or the slave function for error set signal (X08) is turned
ON, and check the contents of the errors.
(2) As for the message communication execution error codes, read them when the
message communication completion (X02) is turned ON, and check the contents
of the errors.
9.2.1 Communication error codes
The error information is stored in buffer memory address 01B1
H
when the master
function is used, and is stored in buffer memory address 0601
H
when the slave
function is used. It is separated into the higher byte and lower byte.
Higher byte: Error code
Lower byte: Node number of the node in which an error is detected
Higher byte Lower byte01B1
H
Node number of the node in which an error is detected
Error code
Buffer memory
(1) When the error-detected node number (lower byte of error information) is FF
H
Detection time period
Error
code
(HEX.)
Error detection Description Corrective action
Master
function
Slave
function
36
H
QJ71DN91
The value of the local node number (MAC ID) is
out of range.
The value of the mode switch is out of range.
• Set the local node number between 0 and 63.
• Set the mode switch to other than D and E.
39
H
QJ71DN91
Two or more nodes that have the same node
number (MAC ID) exist in the network.
• Set non-duplicate node numbers.
E0
H
QJ71DN91 Network power is not being supplied. • Supply the network power (24V DC).
E1
H
QJ71DN91 Other modules are not found in the network. • Connect other modules in the network.
F0
H
QJ71DN91
Node number setting switch or mode switch
setting was changed during operation.
• Return the node number setting switch or mode
switch setting to the original setting.
(2) When the error-detected node number (lower byte of error information) is FE
H
Detection time period
Error
code
(HEX.)
Error detection Description Corrective action
Master
function
Slave
function
02
H
QJ71DN91
The number of input points and output points of
the slave node set by parameters are both 0.
• Set the number of input points and output points
according to the slave node specifications.
03
H
QJ71DN91
The lower byte of the slave node number in the
buffer memory is out of range.
• Set it between 0 and 63.
04
H
QJ71DN91
The higher byte of the slave node number in the
buffer memory is out of range.
• Set it between 01
H
and 04
H
, or to 80
H
.
05
H
QJ71DN91
The connection type in the buffer memory is out
of range.
• Set it to one of the following:
0001
H
, 0002
H
, 0004
H
or 0008
H
06
H
QJ71DN91
A slave node having the same node number as
the node number of the local node is set in the
buffer memory.
• Set non-duplicate node numbers in all nodes.