Flowchart To Use When Error Occurred During Data Link; Flowchart To Use When Unexpected Value Is Input To Specific Link Device; Flowchart To Use When Data Cannot Be Written Or Read In User Program - Mitsubishi Electric SW0DNC-MNETH-B User Manual

14 TROUBLESHOOTING

14.5 Flowchart to Use when Error Occurred During Data Link

14.5.1 Flowchart to use when unexpected value is input to specific link device

14.5.2 Flowchart to use when data cannot be written or read in user program

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The following explains corrective actions when an error occurred during data link.
Check the following items.
(1) Check for a station with link error using the each station status screen.
(2) Check the parameter assignment range at the control station.
(3) Check the device range used in the programmable controller program at the
programmable controller.
(4) Check, in the user program, argument data for the Data Link function accessing
the specific link device.
START
Is the communication
function's return value
abnormal?
NO
Monitor the device to be accessed from
the device monitor utility.
Also, perform a data change to see
if data can be written.
Can the device be monitored?
(Was the data written?)
NO
Did an error occur?
NO
Was it host access?
NO
Check according to the flowcharts in
Section 14.4.
YES
Check the error with the error code table.
Refer to MELSEC Data Link Library
Reference Manual.
YES
Check the user program.
YES
Check the error with the error code table.
Refer to MELSEC Data Link Library
Reference Manual.
YES
Check the MELSECNET/H board is
overlapping with the system and other
boards.
MELSEC
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