Справочник Пользователя для Mitsubishi Electronics QJ71DN91

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MELSEC-Q

9 TROUBLESHOOTING

9.1.2 When communication with all slave nodes cannot be performed (using the master

function)

Communication with all slave nodes cannot be

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

Is the mode switch set between

0 and 2 or between 6 and 8?

Reset by setting the mode switch between
0 and 2 or between 6 and 8.

Yes

Is the communication cable securely

connected to the QJ71DN91 connector?

Connect the communication cable securely.

Is the network power turned ON?

Turn ON the network power.

Is the communication speed

the same in all stations?

Set the same communication speed in
all stations.

Is a terminal resistor connected?

Are there any duplicate slave station

numbers with the QJ71DN91?

Set non-duplicate station numbers.

Are the parameters written?

Do the created parameters match

with the hardware configuration of the

actual slave station?

Create and write correct parameters.

Connect a terminal resistor.

Is the refresh request Y11 set to ON?

Set the refresh request to ON.

Is an error code generated?

Take an action according to the error code.

Check the entire network status such as noise
and installation.

Yes