Flowchart To Use When Data Link Is Not Achieved - Mitsubishi Electric SW0DNC-MNETH-B User Manual

14 TROUBLESHOOTING

14.4 Flowchart to Use when Data Link is not Achieved

Check the MELSECNET/H board LED
Is the "RUN" LED unlit?
Does the "SD/RD" LED
Is the "L.ERR" LED lit?
Start the MNETH utility and select
"8Board Information" screen.
Is "T. PASS" LED of
current station lit?
Select "Each station status" screen.
Can data link be achieved
for the entire system?
Can data link be achieved
for a specific station?
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The following describes a flowchart that must be checked when no data link is
achieved after the MELSECNET/H board and Control station as well as normal
stations were connected.
START
NO
remain unlit?
NO
NO
NO
NO
NO
END
POINT
Refer to the following when the "T. PASS" LED lights up and goes out randomly.
<Cause>
The line may have been in an unstable condition.
<Action>
1) Check the connector for disconnection and the cable for breakage.
2) Verify that the specified cable is used.
3) Check that the overall extension cable length and station-to-station distance is
within the specified range.
YES
Refer to Section 14.4.1, "Flowchart to
use when RUN LED is unlit".
YES
Refer to Section 14.4.2, "Flowchart to
use when SD/RD LED does not turn on".
YES
Refer to Section 14.4.3, "Flowchart to
use when L.ERR LED turns on".
YES Baton passing of current station normal
YES
Refer to Section 14.4.4, "Flowchart to
use when unable to achieve data link
for entire system".
YES
Refer to Section 14.4.5, "Flowchart to
use when unable to achieve data link for
for specific station".
END
Current station normal
MELSEC
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