When Communication With A Specific Slave Node Cannot Be Performed (Using The Master Function) - Mitsubishi QJ71DN91 User Manual

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 communication cable securely
Is the slave node set in a parameter?
number the same as the node number
connection type match with the slave
and message group match with the slave
of the watchdog timeout action match with the
in a parameter match with the I/O configuration of
Is the production inhibit time not too short?
Is the production inhibit time not too long?
Check the entire network status such as noise
and installation.
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Is the slave node power turned ON?
Yes
connected to the slave node?
Yes
Is the communication speed the
same as that of other nodes?
Yes
Are all node numbers unique?
Yes
Yes
Is the actual node
in a parameter?
Yes
Is a reserved node not set?
Yes
Does the specified
node specification?
Yes
Do the UCMM presence
node specification?
Yes
Does the setting value
slave node specification?
Yes
Does the I/O configuration
the actual slave node?
Yes
Yes
Yes
Are the parameters written?
Yes
Is an error code generated?
No
No Turn ON the slave node power.
No Connect the communication cable securely.
Set the same communication speed as that of
No
other nodes.
No Set non-duplicate node numbers.
No
No
No
No
No
No
No
No
No
No
Create and write correct parameters.
Yes
Take an action according to the error code.
MELSEC-Q
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