Filter
Top Products
9 - 4 9 - 4
MELSEC-Q
9 TROUBLESHOOTING
9.1.3 When communication with a specific slave node cannot be performed (using the
master function)
Communication with a specific slave node cannot be
performed (when the NS LED is flashing in red)
Is the slave node power turned ON?
Is the communication cable securely
connected to the slave node?
Are the parameters written?
Create and write correct parameters.
Take an action according to the error code.
Turn ON the slave node power.
Connect the communication cable securely.
Is the communication speed the
same as that of other nodes?
Set the same communication speed as that of
other nodes.
Are all node numbers unique?
Set non-duplicate node numbers.
Is the slave node set in a parameter?
Is the actual node
number the same as the node number
in a parameter?
Is a reserved node not set?
Does the specified
connection type match with the slave
node specification?
Do the UCMM presence
and message group match with the slave
node specification?
Does the setting value
of the watchdog timeout action match with the
slave node specification?
Does the I/O configuration
in a parameter match with the I/O configuration of
the actual slave node?
Is the production inhibit time not too short?
Is the production inhibit time not too long?
Is an error code generated?
Check the entire network status such as noise
and installation.
No
No
No
No
No
No
No
No
No
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Yes