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8.2
Periodic Inspection
The following must be checked once or twice every six months or a year.
Also, perform this inspection when the system is relocated or modified, or when wiring layout is changed. 
Check box
The ambient temperature is within the range of 0 to 55    .
The ambient humidity is within the range of 5 to 95%RH.
There is no corrosive gas.
The voltage across 24VDC terminals is within the range of 15.6V to 31.2VDC.
The Ethernet adapter module is mounted securely.
No dust or foreign matter is present.
No error has occurred.