10 - 5 10 - 5
MELSEC-Q
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.)
Is DeviceNet
cable connected to QJ71DN91's
connector securely
Set Mode switch in range of 3 to 8 and reset.
Check the entire network condition
such as noise or installation.
Mode switch set in 3 to 8?
Yes
Connect DeviceNet cable securely.
Is network power supply on?
Same communication speed
set for all nodes?
Terminating resistors connected?
Eliminate node No. duplication.
I/O points for
slave function matched with parameter settings
of master node?
Turn on the network power supply.
Set same communication speed for all nodes.
Connect terminating resistors.
Set correct I/O points according to the
master node settings.
I/O Communication Request (Y11)
set to on?
Is there an error code?
Polling and UCMM
support (group 3) set with parameter
for master node?
Set polling and UCMM support (group 3)
for master node.
Take corrective actions according to
the error code.
Set I/O Communication Request (Y11) to on.
Is there
a slave node having same node No. as
QJ71DN91?
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
No
No
Summary of Contents for QJ71DN91
Page 1: ...DeviceNet Master Slave Module User s Manual QJ71DN91 GX Configurator DN SW1D5C QDNU E ...
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