Справочник Пользователя для Mitsubishi Electronics QJ71DN91

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MELSEC-Q

9 TROUBLESHOOTING

9.1.4 When communication with the master node cannot be performed (using the slave

function)

Communication with the master node cannot be

performed (when the NS LED is flashing in green or lit in red)

Yes

Is the communication cable securely

connected to the QJ71DN91 connector?

Reset by setting the mode switch between 3 and 8.

Check the entire network status such
as noise and installation.

Is the mode switch set between 3 and 8?

Connect the communication cable securely.

Is the network power turned ON?

Is the communication speed

the same in all nodes?

Is a terminal resistor connected?

Are there any duplicate slave station

numbers with the QJ71DN91?

Set non-duplicate node number.

Does the number of

I/O points of the slave function match with

the parameter setting of the

master station?

Turn ON the network power.

Set the same communication speed in all
nodes.

Connect a terminal resistor.

Yes

Match the number of I/O points with that of the
master station.

Is the I/O communication

request Y11 turned ON?

Is an error code generated?

Are the parameters of

the master station set for polling

and UCMM support (group 3)?

Set the parameters of the master station for
polling and UCMM support (group 3).

Take an action according to the error code.

Turn ON the I/O communication request.

Yes