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13.2 Periodic Inspection
The items that must be inspected one or two times every 6 months to 1 year are listed below.
When the equipment has been relocated or modified, or wiring layout has been changed, perform this inspection.
*1 When an AnS/A Series module is used in the system, the criteria will be from 10 to 90%RH.
*2 The ambient temperature is the temperature inside the control panel where the programmable controller is installed.
No. Inspection item Inspection details Criteria Action
1
Ambient environment
Ambient temperature
*2
Measure with a thermometer
and a hygrometer.
Measure corrosive gas.
0 to 55°C
Ensure that the ambient
environment meets the criteria.
Ambient humidity
5 to 95%RH
*1
Atmosphere
Corrosive gas must not be
present.
2 Power voltage
Measure a voltage between the
terminals of 100/200VAC and
24VDC.
85 to 132VAC
Change the power supply.170 to 264VAC
15.6 to 31.2VDC
3
Installation
Looseness, rattling
Move the module to check for
looseness and rattling.
The module must be installed
securely.
Retighten the screws.
If the CPU, I/O, or power
supply module is loose, fix it
with screws.
Adhesion of dirt and
foreign matter
Check visually.
Dirt and foreign matter must
not be present.
Remove and clean.
4
Connection
Looseness of terminal
screws
Try to further tighten screws
with a screwdriver.
Screws must not be loose. Retighten the terminal screws.
Proximity of solderless
terminals to each other
Check visually.
Solderless terminals must be
positioned at proper intervals.
Correct.
Looseness of
connectors
Check visually. Connectors must not be loose.
Retighten the connector fixing
screws.
5 Battery
Check the BAT. LED at the
front side of the CPU module.
The LED must be off.
Replace the battery when the
BAT. LED is on.
Check the length of term after
purchasing the battery.
Must not be used more than 5
years.
Replace the battery if it has
been used more than 5 years.
Check that SM51 or SM52 is
turned off using a programming
tool in monitor mode.
Must be turned off.
Replace the battery when
SM51 or SM52 is on.
6 PLC diagnostics Check the Error log.
The Error log must not be
updated.
Page 282, Section 15.2
7 Maximum scan time
Check the values of SD526
and SD527 using a
programming tool in the
monitor mode.
Maximum scan time must be
within the allowable range
given in the specification of the
system.
Specify factors that increase
the scan time.
(Check the operation status of
the trigger signal that passes
through a loop if loop positions
exist in the sequence
program.)
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