319
Maintenance
Section 8-3
Inspection Equipment
Prepare the following equipment before inspecting the system.
Required Equipment
Have a standard and phillips-head screwdriver, multimeter, alcohol, and a
clean cloth.
Equipment that May be Required
Depending on the system conditions, a synchroscope, oscilloscope, ther-
mometer, or hygrometer (to measure humidity) might be needed.
Inspection Procedure
Check the items in the following table and correct any items that are below
standard.
8-3-3
Replacing Nodes
The DeviceNet Master Unit and Slave Units make up the network. The entire
network is affected when a Unit is faulty, so a faulty Unit must be repaired or
replaced quickly. We recommend having spare Units available to restore net-
work operation as quickly as possible.
Precautions
Observe the following precautions when replacing a faulty Unit.
• After replacement make sure that there are no errors with the new Unit.
• When a Unit is being returned for repair, attach a sheet of paper detailing
the problem and return the Unit to your OMRON dealer.
• If there is a faulty contact, try wiping the contact with a clean, lint-free
cloth dampened with alcohol.
Settings after Replacing
Nodes
After replacing a Unit, set the new Unit’s switches to the same settings that
were on the old Unit.
Item
Standard
Equipment
Environmental
conditions
Ambient and cabinet temperature
See below.
Thermometer
Ambient and cabinet humidity
See below.
Hygrometer
Dust/dirt accumulation
None
---
Installation
Are the Units installed securely?
No looseness
---
Are the communications connec-
tors fully inserted?
No looseness
---
Are the external wiring screws
tight?
No looseness
---
Are the connecting cables undam-
aged?
No damage
---
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