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14 TROUBLESHOOTING
14.4.2 Flowchart to use when SD/RD LED does not turn on
Turn on/off the B, X and Y
assigned to the host via
PC.
Monitor B, X and Y at
other stations.
Does the B,
X and Y turn on/off at
other stations?
YES
Check the monitor
condition or user program.
Did the SD/RD
turn on?
YES
Complete
14 - 16
The board information screen of MNETH utility displays SD and RD LED status. This
function is the same as the MELSECNET/H board's LED messages.
An error occurs.
Is the L.ERR LED lit?
NO
Is the
control station
parameter
OK?
YES
Does the
YES
"SD" LED remain
unlit?
NO
Replace the PC MELSECNET
/H board.
Are the
NO
monitor condition
and user program
normal?
NO
Consult with the dealer
regarding the problem.
YES
Go to Section 14.4.3.
NO
Check the control station
parameter.
Does the
NO
"RD" LED remain
unlit?
YES
Turn on/off the B, X and Y
used by PC at other
stations.
Monitor B, X and Y via PC.
Does the B,
NO
X and Y turn on/off
at PC?
YES
YES
Replace the MELSECNET/H
board since the "SD" and
"RD" LEDs are broken.
MELSEC
NO
Normal
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Troubleshooting
