14 - 14 14 - 14
MELSEC
14 TROUBLESHOOTING
14.4 Flowchart to Use when Data Link is not Achieved
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.
YES
YES
Refer to Section 14.4.5, "Flowchart to
use when unable to achieve data link for
for specific station".
YES
Refer to Section 14.4.4, "Flowchart to
use when unable to achieve data link
for entire system".
YES
Refer to Section 14.4.3, "Flowchart to
use when L.ERR LED turns on".
YES
Refer to Section 14.4.2, "Flowchart to
use when SD/RD LED does not turn on".
YES
Refer to Section 14.4.1, "Flowchart to
use when RUN LED is unlit".
START
Check the MELSECNET/H board LED
Is the "RUN" LED unlit?
Does the "SD/RD" LED
remain unlit?
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?
END
NO
Current station normal
Baton passing of current station normal
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.
Summary of Contents for Q80BD-J71BR11
Page 2: ......
Page 24: ...A 22 A 22 MEMO ...
Page 50: ...4 6 4 6 MELSEC 4 FUNCTION MEMO ...
Page 92: ...6 36 6 36 MELSEC 6 PROCEDURE AND SETTINGS UP TO THE POINT OF OPERATION MEMO ...
Page 132: ...10 2 10 2 MELSEC 10 MELSEC DATA LINK LIBRARY MEMO 10 ...
Page 138: ...11 6 11 6 MELSEC 11 PROGRAMMING MEMO ...
Page 164: ...12 26 12 26 MELSEC 12 APPLICATION FUNCTIONS MEMO ...
Page 166: ...13 2 13 2 MELSEC 13 ERROR CODE MEMO 13 ...
Page 223: ......
