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Chapter 8 Daily and Periodic Inspection
8.2
Periodic inspection
Turn off the power for the external I/O and check the following items once every six months.
Part
Programming
device to CPU
Power supply
Installation and
connecting areas
Ambient
environment
Spare parts
Program
Table 8.2 Items for periodic inspection
Item
Check operation of
programming device
Check for voltage
fluctuations
(1) All modules are
securely fixed
(2) All connectors fit
snugly
(3) All screws are tight
(4) All cables are normal
(1) Temperature
(2) Humidity
(3) Other
Check number of parts,
storage condition
Check program contents
Check criteria
All switches and display lamps
work normally.
85 to 264 V AC
(AC power supply)
21.6 to 26.4 V DC
(DC power supply)
No defects
0 to 55 C
20 to 90 RH (no condensation)
No dust, foreign matter,
vibration
No defects
Compare the contents of the
latest program saved and CPU
contents, and make sure they are
the same
8 - 2
Remarks
Tester
Tighten
Check insertion
Tighten
Check both master and
backup.
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