Mitsubishi Electric Melsec QJ71LP21 Reference Manual page 438

8 TROUBLESHOOTING
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3) LED2 information
Displays the information of the LEDs that are turned on by the network
module. The contents are displayed in the following manner:
• "UNDER RUN reverse loop" to "CRC reverse loop" display information of
errors that have occurred on the reverse loop side. The "L ERR." of 1)
Actual LED1 information turns on if either one of these errors have occurred
(corresponding LED information turns on) or the "UNDER RUN forward
loop" to "CRC forward loop" LED information of 2) LED1 information is lit.
Furthermore the "Forward loop error" turns on if either of "UNDER RUN
forward loop" to "CRC forward loop" is on. The "Reverse loop error" turns
on if either of "UNDER RUN reverse loop" to "CRC reverse loop" is on.
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4) LED3 information
Displays the information of the LEDs that are turned on by the network
module. The contents are displayed in the following manner:
• "T.PASS" turns on during baton pass. When this LED information turns on,
the "T.PASS" of 1) Actual LED1 information is turned on.
• "D.LINK" turns on during data linking. When this LED information turns on,
the "D.LINK" of 1) Actual LED1 information is turned on.
• "S.MNG" and "MNG" turn on when the network module is being controlled
by the sub-control station and the control station, respectively. When
either of this LED information turns on, the "MNG" of 1) Actual LED1
information is turned on.
• "ERR" of 1) Actual LED1 information turns on if either "Parameter setting
error" or "Duplicate station number/control station error" of 2) LED1
information, or the "Switch setting error" is on.
• "PC" turns on when the network module is operating on PLC to PLC
network. (1: fixed)
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b0
UNDER RUN forward loop
DATA forward loop
TIME forward loop
ABORT IN-FR forward loop
OVER RUN forward loop
CRC forward loop
Parameter setting error
1: On
Duplicate station
0: Off
number/control station error
b0
UNDER RUN reverse loop
DATA reverse loop
TIME reverse loop
ABORT IN-FR reverse loop
OVER RUN reverse loop
CRC reverse loop
Forward loop error
1: On
0: Off
Reverse loop error
b0
T.PASS
D.LINK
S.MNG
MNG
Switch setting error
Unused "0"
Unused "0"
1: On
PC
0: Off
MELSEC-Q
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