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
th
e m
a
in
m
odul
e
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.
Summary of Contents for Q2ACPU
Page 1: ......
Page 2: ......
Page 221: ...12 12 12 OVERVIEW OF PROCESSING PERFORMED BY THE QnACPU ...
Page 222: ...12 13 12 OVERVIEW OF PROCESSING PERFORMED BY THE QnACPU ...
Page 237: ...12 28 12 OVERVIEW OF PROCESSING PERFORMED BY THE QnACPU MEMO ...
Page 271: ...16 13 16 POWER SUPPLY MODULE 4 Names and description of parts of the A66P ...
Page 343: ...21 21 13 MAINTENANCE AND INSPECTION 21 4 2 Replacement of the fuse for an output module ...
Page 357: ...22 12 22 TROUBLESHOOTING ...
Page 359: ...22 14 22 TROUBLESHOOTING MEMO ...
Page 429: ...App 32 APPENDICES Trigonometric function Classification Symbol Description ...
Page 537: ...App 140 APPENDICES REMARK 1 Message 1 An error code is displayed in 2 Alert 1 3 Alert 2 ...
Page 539: ...App 142 APPENDICES 2 Q2ACPU Q2ACPU S1 modules Unit mm inch ...
Page 541: ...App 144 APPENDICES 2 A66P power supply module Unit mm inch ...
Page 543: ...App 146 APPENDICES 3 A35B base unit 4 A38B A38HB A38HBEU base unit Unit mm inch Unit mm inch ...
Page 567: ...MEMO ...
Page 569: ......
Page 570: ......