When Unable To Communicate With A Specific Slave Node (When Using Master Function) - Mitsubishi Electric QJ71DN91 User Manual

9 TROUBLESHOOTING

9.1.3 When unable to communicate with a specific slave node (when using master function)

Unable to communicate with a specific slave node.
cable connected to the slave no
Is comm. speed same as other nodes?
slave node set with parameters?
parameter for node No. same as the
connection type matched with the slave
and message group matched with the
for watchdog timeout action matched with
parameters matched with the actual
Production inhibit time too short?
Production inhibit time too long?
Have the parameters been written?
Check the entire network condition
such as noise or installation.
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(NS LED is flashing red.)
Is the slave node powered ON?
Yes
Is DeviceNet
securely?
Yes
Yes
Node No. duplicated?
Yes
Is the
Yes
Is the
actual one?
Yes
Set as reserved node?
No
Specified
node spec?
Yes
UCMM support
slave node spec?
Yes
Value set
the slave node spec?
Yes
I/O configuration
configuration?
Yes
No
No
Yes
Is there an error code?
No
Power ON the slave node.
No
No Connect DeviceNet cable securely.
No
Set the same communication speed.
No Eliminate node No. duplication.
No
No
Yes
No
No
No
No
Yes
Yes
No Configure and write correct parameters.
Take corrective actions according
Yes
to the error code.
MELSEC-Q
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