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6-1 Maintenance
This section explains maintenance methods of the Host Link System. The Host
Link Unit is a part of a network. The malfunctioning of the Host Link Unit may
influence the whole network. Therefore, if the Host Link Unit malfunctions, re-
place it promptly. In order to restore the network promptly, we recommend the
user to stock extra Host Link Units.
Replacement Read the following before replacing the Host Link Unit.
1, 2, 3... 1. Turn off the power before replacing the Host Link Unit.
2. After replacing a defected Host Link Unit with a new one, make sure that the
new Unit works properly.
3. When sending a defected Host Link Unit to your OMRON representative,
describe the defective condition in detail and attach the description to the
Host Link Unit.
4. In the case of improper contact, clean the contacts of the Host Link Unit with
a clean cotton cloth soaked with industrial-grade alcohol. Be sure to remove
all cotton fibers from the contacts before mounting the Host Link Unit.
Setting after Replacing PCs CPU Bus Unit System Setup parameters are stored in the EEPROM of the CPU.
When replacing a PC with a new one, be sure to set CPU Bus Unit System Setup
parameters on the new PC properly.
Note Refer to the CV-series PC Installation Guide for the maintenance of the CPU.
Periodical Maintenance Periodical maintenance of the Host Link Unit is necessary in order to keep it in
good condition.
Check Points The Host Link Unit consists basically of semiconductors. Although a semicon-
ductor has almost a limitless life, it may be deteriorated if used under improper
environments. Therefore, periodical maintenance (once every six months to
one year according to the operating environment) of the CPU and Host Link Unit
is necessary. The following table lists the items that must be checked.
Item Check Criteria
Environment Ambient temperature and temperature
inside the panel
0° to 55°C
Ambient humidity and humidity inside
the panel
10% to 90% (with no condensation)
Dust No dust
Mounting condition Mounting of Unit To be properly mounted
Connector To be properly inserted
Screws for external wiring To be tightened securely
External cable To be in good condition upon visual
check
Maintenance Tools A Phillips screwdriver, flag-blade screwdriver, circuit tester, cotton cloth, and in-
dustrial-grade alcohol are required for periodical maintenance.
In addition, a synchroscope, pen-writing oscilloscope, thermometer, and hydro-
scope may be required occasionally.
Maintenance Section 6-1
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