When Communication With All Slave Nodes Cannot Be Performed (Using The Master Function) - Mitsubishi QJ71DN91 User Manual

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 communication cable securely
connected to the QJ71DN91 connector?
with the hardware configuration of the
Is the refresh request Y11 set to ON?
Check the entire network status such as noise
and installation.
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Is the mode switch set between
0 and 2 or between 6 and 8?
Yes
Yes
Is the network power turned ON?
Yes
Is the communication speed
the same in all stations?
Yes
Is a terminal resistor connected?
Yes
Are there any duplicate slave station
numbers with the QJ71DN91?
No
Are the parameters written?
Yes
Do the created parameters match
actual slave station?
Yes
Yes
Is an error code generated?
No
Reset by setting the mode switch between
No
0 and 2 or between 6 and 8.
No
Connect the communication cable securely.
No
Turn ON the network power.
Set the same communication speed in
No
all stations.
No Connect a terminal resistor.
Yes
Set non-duplicate station numbers.
No
No
Create and write correct parameters.
No
Set the refresh request to ON.
Take an action according to the error code.
Yes
MELSEC-Q
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