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11.
TROUBLESHOOTING
MELSEC-A
11.3.4 When the 2-C/N (LED No.
16)
or 4-C/N (LED No.
20)
is turned ON
Flow chart to use when the 2-C/N (LED No. 16) or 4-C/N (LED No.
20)
on the
AJ71C24 panel turns ON.
Is LEO No. 16 or No. 20 ON?
0
Is the PC CPU
NO
I
Replace the PC CPU with the type
of PC CPU mentioned in Section
2.2 or with
an
AJ72P251R25.
NO
I
Reset the relevant PC CPU.
NO
NO
data been transmitted
1
mop the PC CPU, or depending
on
communications data, set write
during RUN of the AJ71C24 to
'enabled'.
NO
Is the
1
Check and correct the
I10
number.
-
NO
module operating
1
Special function module control
bus error. Possible PC CPU
I
module, base unit, or special
Consult the nearest Mitsubishi
representative.
I
Change modules.
Consult the nearest Mitsubishi
representative.
I
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