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Honeywell 2MLL-PSRA User Manual Page 89

Pnet i/f module.
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7. Maintenance and Repair
7.1
I/O module maintenance
The routine inspections are recommended to maintain the module in good condition.
The I/O module mainly consists of semiconductor elements. Hence, the life of PLC
depends upon the condition of its semiconductor parts. Regular checks must be carried
out as errors in the elements may occur due to the effect of the surrounding environment.
Refer to the following table for the items to be checked, once or twice in every 6 months.
Checklist
Tempera
ture
Environ
Humidity
ment
Vibration
Loose terminal screw
Input voltage change
rate
Spare parts
Power supply
R210
Pnet I/F Module 2MLL-PSRA, 2MLL-PSEA User's Guide
November 2011
Judgment Basis
0 ~ + 55°C
Adjust the temperature and humidity
conditions properly.
5 ~ 95%RH
Use vibration-preventive rubber or
None
other measures.
Screws should not
Tighten the loosened screw.
be loose.
Within -15%+10%
Maintain the change rate within the
allowable range.
Check whether the
Replenish insufficient parts and
amount and
conditions of spare
improve the storage condition.
parts are proper.
Voltage measure
Adjust the power within the allowable
between terminals.
voltage variance range.
DC 20.4 ~ 28.8V
Honeywell
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