8.
MAINTENANCE
AND
INSPECTION
/MELSEC-A
8.
MAINTENANCE
AND
INSPECTION
This section describes items for daily and periodic maintenance
and
inspection
in
order to maintain the programmable controller
in the normal and best conditions.
8.1
Daily
Inspection
Table
8.1
shown the inspection items which are to be checked
daily.
2
-
Connecting conditions
"POWER" LED
"RUN"
LED
'ERROR" LED
.-
-
'RD" LED
Check
Point
Corrective
Action
Judgement
I
Check for loose terminal
Screws should not be
Retighten
terminalscrews.
screws.
loose.
I
Check distance between
be
provided
Proper clearance should
solderless terminals.
solderless terminals.
Correct.
Check connectors of
mounting screws.
be loose.
extension cable.
Retighten connector Connections should not
Check that
the
LED
is
on.
1
an
error.)
1
See
section
9.2.2.
On.
(Off
indicates
Check that the LED is on
I
On.
(Off
or flicker See Section
9.2.3
during run. indicates an error.) and
9.2.4.
I
Check that the LED
is
on
Off,
(On
when
an
error
when an error has
occurred.
has occurred.)
See Section
9.2.5.
Check that the LED flick-
cases. mitted.
See Section
9.2.6.
transmitted.
Off
in other ers while data
is
trans-
Flickers while data
is
Check that the LED flick-
Flickers while data is re-
ers while data is received. ceived.
Off
in other cases.
See Section
9.2.6.
I
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