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10 TROUBLESHOOTING
10.1 Problem Identification
10.1.1 Checking the LEDs
Mode switch set in 0 to 8?
Parameter error has occurred.
Check 1B1H "Error Information for
Master Function" or 601H "Error
Information for Slave Function" in
the buffer memory for an error code,
and take corrective actions.
10
10 - 2
This section explains checking procedures and actions to be taken when a problem
occurs.
Problem occurred
Yes
MS LED lit green?
Yes
NS LED lit?
Yes
NS LED lit green
No
or flashing green?
NS LED lit red?
Yes
Check if:
Node No. is within the range of 0 to 63.
The same node No. exists on the network.
The same communication speed is set for
the entire network.
Terminating resistors are connected to both ends of
the trunk line.
Check for an error code.
If the above check results are normal, check the entire
network condition such as noise or installation.
ERR.LED lit?
Yes
Set Mode switch in range of 0 to 8
No
and reset.
(MS LED is off.)
No
Power on the module.
Turn on the network power (24V).
No
No
NS LED flashing red?
Yes
Set I/O Communication Request (Y11) to
No
MELSEC-Q
Yes
I/O communication with one or more
slave nodes has failed.
Check 1B1H "Error Information for
Master Function" or 601H "Error
Information for Slave Function"
in the buffer memory for an error code,
and take corrective actions.
on
.
10 - 2
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Table of Contents
Troubleshooting
