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

10 TROUBLESHOOTING

10.1.4 When unable to communicate with master node (when using slave function)

Unable to communicate with master node.
(NS LED is flashing green or lit red.)
cable connected to QJ71DN91's
Terminating resistors connected?
a slave node having same node No. as
slave function matched with parameter settings
support (group 3) set with parameter
I/O Communication Request (Y11)
Check the entire network condition
such as noise or installation.
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Mode switch set in 3 to 8?
Yes
Is DeviceNet
connector securely
Yes
Is network power supply on?
Yes
Same communication speed
set for all nodes?
Yes
Yes
Is there
QJ71DN91?
No
I/O points for
of master node?
Yes
Polling and UCMM
for master node?
Yes
set to on?
Yes
Is there an error code?
No
No
Set Mode switch in range of 3 to 8 and reset.
Connect DeviceNet cable securely.
No
Turn on the network power supply.
No
Set same communication speed for all nodes.
No
Connect terminating resistors.
No
Eliminate node No. duplication.
Yes
Set correct I/O points according to the
No
master node settings.
Set polling and UCMM support (group 3)
No
for master node.
No
Set I/O Communication Request (Y11) to on.
Take corrective actions according to
Yes
the error code.
MELSEC-Q
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