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7 . TRUOBLESHOOTING
MELSEC-A
7.2
When the RUN LED Flashes
or Goes OFF
When the
R U N
LED flashes:
I
~~
~
Check Point
Corrective Action
I
I
Data which disables write or read is
written to an A64RDC.
Refer to the tables in Section 7.1 for
the cause, and correct the sequence
program.
When the RUN LED goes OFF:
Check Point
Corrective Action
24 VDC power supply is turned ON.
Make sure the power supply is ON.
I
I s
the voltage applied to the A64RDC
Adjust the voltage within the range of
within the allowable range?
1 1 5 . 6 V t o 3 1 . 2 V .
When a MINI-S3 link is connected:
I s
communications start Y(n+28) in the se-
the MINI-S3 link communications start
Add a loop to turn ON the MINI-S3 link
quence program.
Y(n+28) turned ON?
Reset the A64RDC and the PC CPU,
If the MINI-S3 link is connected, error
faulty. Consult your nearest Mitsubishi
module buffer at addresses 196 to 209.
stored, the system hardware may be code
'6" may be stored in the master
and start them. If error code '6" is
representative.
If the M I N I S 3 link is connected, error
Reset the A64RDC and the PC CPU,
codes u9" and
may be stored in the
master module buffer at addresses 196
and start them. If error codes
'9" and
Mitsubishi representative
to 209.
'1
0 '
are stored, the system hardware
may be faulty, Consult your nearest
Data link cables are normal.
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Check the cables (see Section 6.6).
The TEST terminals are open.
After error compensation, open the test
terminals.
7.3 When the LINK RUN LED is Turned OFF and the LINK ERR. LED is Turned
ON
Check Point Corrective Action
The RUN
LED
is flashing.
See Section 7.2
(2).
The RUN
LED turned OFF.
See Section 7.2 (1).
7-3
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