Daily Inspection - Mitsubishi Electric Q172DCPU User Manual

6 INSPECTION AND MAINTENANCE

6.2 Daily Inspection

Item Inspection item
1 Mounting of base unit
Installation of I/O
2
module
3 Connecting conditions
[POWER] LED Check that the LED is ON.
[MODE] LED
[RUN] LED
[ERR.] LED
[BAT.] LED
Normal
4
Battery error
warning
(2.7V or less)
Battery error
warning
(2.5V or less)
WDT error
Others
Input LED
Output LED
The items that must be inspected daily are shown below.
Table 6.1 Daily Inspection
Inspection
Check that the fixing
screws are not loose and
the cover is not dislocated.
Check that the module is
not dislocated and the unit
fixing hook is engaged
securely.
Check for loose terminal
screws.
Check for distance between
solderless terminals.
Check the connector part of
the cable.
Check that the LED is ON.
Check that the LED is ON
in RUN status.
Check that the LED is OFF.
Check that the LED is OFF.
Check that the LED is
ON/OFF.
Check that the LED is
ON/OFF.
Criterion
The screws and cover must be mounted securely.
The module fixing hook must be engaged and installed
correctly.
Screws should not be loose.
The proper clearance should be provided between
solderless terminals.
Connections should not be loose.
The LED must be ON (green).
(Abnormal if the LED is OFF or ON (red)).
The LED must be ON (green).
(Abnormal if the LED is OFF or flickering.)
The LED must be ON.
(Abnormal if the LED is OFF.)
The LED must be OFF.
(Abnormal if the LED is ON or flickering.)
The LED must be OFF.
(Abnormal if the LED is ON.)
Steady "RUN" display.
(Abnormal if "RUN" does not display or incorrect display.)
Steady "STP" display.
(Abnormal if "STP" does not display or incorrect display.)
"BT1" does not display.
(Abnormal if steady "BT1" display.)
"BT2" does not display.
(Abnormal if steady "BT2" display.)
" . . . " does not display.
(Abnormal if steady " . . ." display.)
" AL" does not flash.
(Abnormal if " . . ." flashes.)
The LED must be ON when the input power is turned ON.
The LED must be OFF when the input power is turned OFF.
(Abnormal if the LED does not turn ON or turn OFF as
indicated above.)
The LED must be ON when the input power is turned ON.
The LED must be OFF when the input power is turned OFF.
(Abnormal if the LED does not turn ON or turn OFF as
indicated above.)
6 - 4
Action
Retighten the
screws.
Securely engaged
the module fixing
hook.
Retighten the
terminal screws.
Correct.
Retighten the
connector fixing
screws.
Refer to
"QCPU User's
Manual (Function
Explanation,
Program Funda-
mentals)".
Refer to Section
2.4.1(2)
Refer to Section
6.5
Refer to Section
2.4.1(2)
Refer to
"
I/O Module Type
Building Block
"
User's Manual .