Omron CRT1 - 10-2009, Operation Manual

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589
Device Maintenance
Section 12-3
12-3-3 Handling when Replacing Units
Networks are constructed from a Master Unit and Slave Units. If a Unit is mal-
functioning, the entire network will be affected. The malfunctioning Unit must
be replaced quickly. To restore network functions as quickly as possible, it is
recommended that spare Units are kept on hand ready to replace malfunc-
tioning Units immediately.
Precautions When
Replacing Units
Heed the following precautions when replacing nodes after a periodic inspec-
tion has revealed a problem.
Check that the new Unit does not have errors after replacement.
If returning malfunctioning devices for repair, attach a detailed description of
the malfunction to the device and send the device to the OMRON representa-
tive listed at the end of this manual or to your OMRON representative.
If contacts are defective, wipe them with a clean pure cotton cloth that has
been soaked in industrial alcohol.
Settings after Unit
Replacement
After replacing a Unit, make the switch and other settings the same as before
the Unit was replaced.
Installation Has the Unit been
secured? No looseness Phillips screwdriver
Are the communica-
tions cable connec-
tors inserted
properly? No looseness Phillips screwdriver
Are the external wir-
ing screws loose? No looseness Phillips screwdriver
Are the connection
cables damaged? No visible damage Visual inspection
Inspection
item
Inspection details Criteria Inspection method