Mitsubishi Q2ACPU User Manual

21.
21 - 1
MAINTENANCE AND INSPECTION
21 MAINTENANCE AND INSPECTION
In order to use the PLC always in good condition, conducting daily and periodical
maintenance/inspection on the following items are strongly recommended.
21.1 Daily Inspection
Dairy inspection items recommended are shown in Table 21.1.
REMARK
If an I/O module has to be replaced when the system is running, use the "online I/O
module replacement" function.
Table 21.1 Daily inspection
Item Check item Content of inspection Judgement Action
1
Installation condition
of the base unit
Confirm if installation
screws are not loose or
cover is not detached.
It is installed securely. Retighten the screw.
2
Installation condition
of the I/O modules
Check if the module is
not disengaged and if
the hook is securely
engaged.
The hook should be securely
engaged and the module
should be positively
mounted.
Securely engage the
hook.
3
Connection
conditions
Loosening of terminal
screw.
No loosening.
Retighten the terminal
screw.
Proximity of solderless
terminals.
There is an appropriate
distance.
Correct the distance.
Connector areas of
extension cable.
No loosening at connectors.
Retighten the
connector fixing screw.
4
LEDs on the main module
Power supply
module
POWER LED
Confirm it is ON.
The LED is ON.
(Faulty if it is OFF.)
Refer to Section 22.2.2.
CPU module
"RUN" LED
Confirm it is ON in the
"RUN" state.
The LED is ON.
(Faulty if it is OFF.)
Refer to
CPU module
"ERROR" LED
Check that the LED is
OFF.
OFF
(Faulty if it is ON or
flickering.)
Refer to Section 22.2.5.
CPU module
"BAT. ARM" LED
Check that the LED is
OFF.
OFF
(Faulty if it is ON.)
Refer to Section 22.2.7.
Input module
LED
Confirm if it correctly
turns on and off.
The LED is ON when input is
ON, and OFF when input is
OFF.
(Faulty other than the above.)
Refer to Section 22.2.8.
Output module
LED
Confirm if it correctly
turns on and off.
The LED is ON when output
is ON, and OFF when output
is OFF.
(Faulty other than the above.)
Refer to Section 22.2.8.
Section 22.2.3.
Section 22.2.4.

Mitsubishi Q2ACPU Specifications

General

Brand	Mitsubishi
Model	Q2ACPU
Category	Controller
Language	English