7 Maintenance and Inspection
7-2
CP1E CPU Unit Hardware User’s Manual(W479)
7-1 Periodic Maintenance and Inspection
This section describes periodic inspections and maintenance of CP1E PLCs.
Daily or periodic inspections are required in order to maintain the PLC’s functions in peak operating
condition.
z Required Tools
• Phillips screwdrivers
• Voltage tester or digital voltmeter
• Industrial alcohol and clean cotton cloth
z Tools Required Occasionally
• Synchroscope
• Oscilloscope with pen plotter
• Thermometer and hygrometer (humidity meter)
Although the major components in CP-series PLCs have an extremely long life time, they can deterio-
rate under improper environmental conditions. Periodic inspections are thus required to ensure that the
required conditions are being kept.
Inspection is recommended at least once every six months to a year, but more frequent inspections will
be necessary in adverse environments.
Take immediate steps to correct the situation if any of the conditions in the following table are not met.
z Battery
7-1-1 Tools Required for Inspections
7-1-2 Periodic Inspection
Item Life Remedy
Check whether the Battery
has reached its service life
(CP1W-BAT01 Battery).
Service life expectancy
is 5 years at 25ºC, less
at higher temperatures.
(From 1.5 to 5 years
depending on model and
ambient temperature.)
Replace the Battery when its service life has passed
even if a Battery error has not occurred. The service life
depends on the model and ambient temperature.
Refer to 7-2 Replacing the Battery in N-type CPU
Units.
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