Chapter 7: Testing and Troubleshooting 141
Periodic Inspection and Preventive Maintenance
The D50 PLC Series requires regular inspection and maintenance for proper operation. The following
items should be checked every six months.
Item What to Check Criteria
Test
Equipment
Supplied
Power
Does the voltage measured within the
power terminal fall within the
specified range?
Voltage must fall within the power
module input voltage specifications.
Voltmeter
Does the temperature fall within the
specified range?
0 to 55°C (32 to 131°F) Thermometer
Does the humidity fall within the
specified range?
Humidity levels below 20% RH. Hygrometer
Environment
Is there any dust present? No dust. Visual
I/O Power Does the control voltage supplied to
the I/O modules fall within the
specified limit?
Control voltage must fall within the
input and output modules
specifications.
Voltmeter
Are all of the modules secure?
Is the connection cable secure?
Module
Mounting and
Wiring
Is the external wiring screw loose?
All should be firmly secured. Screwdriver
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