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

9 TROUBLESHOOTING

9.1.2 When unable to communicate with all slave nodes (when using master function)

Unable to communicate with all slave nodes.
(NS LED is flashing green or lit red.)
Mode switch set in 0 to 2 or 6 to 8?
Is DeviceNet cable connected to
QJ71DN91s connector securely?
Terminating resistors connected?
a slave node having same node No. as
matched with hardware configuration of the
Check the entire network condition such
as noise or installation.
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Yes
Yes
Is network power supply ON?
Yes
Same communication
speed set for all nodes?
Yes
Yes
Is there
QJ71DN91?
No
Have the parameters
been written?
Yes
Are the parameters
actual slave nodes?
Yes
I/O Communication
Request (Y11) set to ON?
Yes
Is there an error code?
No
Set Mode switch in range of 0 to 2
No
or 6 to 8 and reset.
No
Connect DeviceNet cable.
Turn ON the network power supply.
No
No
Set same communication speed for all nodes.
No
Connect terminating resistors.
Yes
Eliminate node No. duplication.
No
No
Configure and write correct parameters.
Set I/O Communication Request (Y11) to ON.
No
Take corrective actions according to
Yes
the error code.
MELSEC-Q
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