User`s manual

Daily inspection Maintenance and inspection
MELSEC System Q, Hardware 10 – 1
10 Maintenance and inspection
In order to use the programmable controller in normal and optimal condition at all times, this sec-
tion describes items that must be maintained or inspected daily or at regular intervals.
10.1 Daily inspection
The items that must be inspected daily are listed in the following table:
Inspection item Inspection Judgment criteria Measures
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.
Installation of I/O module Check that the module is
not dislocated and the
unit fixing hook is
engaged securely.
The module fixing hook must
be engaged and installed
securely.
Securely engage the
module fixing hook.
Connecting conditions Check for loose terminal
screws.
Screws must not be loose. Retighten the terminal
screws.
Check for distance
between solderless ter-
minals.
The proper clearance must be
provided between solderless
terminals.
Correct.
Check that the cable
connector is not loose.
Connections must not be loose. Retighten the connector
fixing screws.
Module indi-
cation LED
POWER
LED
Check that the LED is
on.
The LED must be on (green).
(Error if the LED is off or on
(red)).
refer to section 11.2.4
RUN LED Check that the LED is on
in the RUN status.
The LED must be on. (Error if
the LED is off/flickering.)
refer to sections 11.2.8
and 11.2.9
ERR.LED Check that the LED is
off.
The LED must be off. (Error
detected if the LED is on.)
refer to sections 11.2.10
and 11.2.11
BAT. LED Check that the LED is
off.
The LED must be off. (Error if
the LED is on.)
refer to section 11.2.12
Input LED Check that the LED turns
on and off.
The LED must be on when the
input power is turend 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.)
refer to section 11.4
Output LED Check that the LED turns
on and off.
The LED turns on when the
output power is turned on. The
LED must be off when the out-
put power is turned off.
(Error if the LED does not turn
on or turn off as indicated
above.)
refer to section 11.2.15
Tab. 10-1: Daily inspection