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9.2 Maintenance
To keep programmable controllers in the best operating condition, conduct the
following daily inspection and periodic inspection.
(1) Daily inspection
The following table lists the items that must be inspected daily.
Table 9.1 Daily inspection
Item Inspection item Inspection contents Judgment criterion Measures
1
Installation of base
unit
Check that fixing
screws are not loose
and the cover is not
dislocated.
The screws and
cover must be
installed securely.
Retighten the
screws.
2
Installation of I/O
module
Check that the
module is not
dislocated and the
module fixing hook is
engaged securely.
The module fixing
hook must be
engaged and
installed securely.
Securely engage the
module fixing hook.
Or tighten the screw.
Check for loosening
of the terminal
screws.
Screws must not be
loose.
Retighten the
terminal screws.
Check for the
distance between
solderless terminals.
The proper distance
must be provided
between solderless
terminals.
Set the proper
distance.
3
Connection
conditions
Check the connector
part of the cable.
Connectors must not
be loose.
Retighten the
connector fixing
screws.
Power supply
module
"POWER" LED
Check that the LED
is on.
The LED must be on.
(Error if the LED is
off)
CPU "RUN" LED
Check that the LED
is on in RUN status.
The LED must be on.
(Error if the LED is
off)
CPU "ERROR"
LED
Check that the LED
is off.
The LED must be off.
(Error if the LED is
on or flashing)
CPU "BAT.ARM"
LED
Check that the LED
is off.
The LED must be off.
(Error if the LED is
on)
Input LED
Check that the LED
turns on and off.
The LED must be on
when the input power
is turned on.
The LED must be off
when the input power
is turned off.
(Error if the LED
does not turn on or
turn off as indicated
above)
4
Module indication LED
Output LED
Check that the LED
turns on and off.
The LED must be on
when the output
power is turned on.
The LED must be off
when the output
power is turned off.
(Error if the LED
does not turn on or
turn off as indicated
above)
Refer to QCPU (Q
mode) User's
Manual.