Omron PROFINET NX-PNC202 User Manual page 125

 Grounding Methods
PROFINET
IO Device
DIN Track
100 Ω or less
OK
(a) Independent Grounds: Best
If the DIN Track is made of steel and the surface is not treated to produce an insulating material, you
can omit grounding the functional ground terminal on any Unit that has one, as shown in the follow-
ing figures.
• DIN Track Made of Steel and Surface Not Insulated
PROFINET
IO Device
DIN Track
(a) Independent Grounds: Best
 Precautions when Grounding
• To prevent influence from leakage current from other electrical devices, electrically isolate the
panel in which the Profinet IO Device Terminal is housed from other devices.
• If high-frequency equipment is present, then ground not only the high-frequency equipment but
also the panel itself in which the Profinet IO Device Terminal is housed.
• To ground the shield wire when using shielded cables for IO wiring, wire the ground according the
shield treatment specifications for the NX Unit that is used.
Wire communications cables according to the shield treatment specifications for the Unit.
NX-series PROFINET Coupler Unit User's Manual (W623)
DIN Track
Other
device
Ground to
(b) Common Ground: Acceptable
DIN Track
Other
device
Ground to
100 Ω or less
OK
(b) Common Ground: Acceptable
PROFINET
IO Device
DIN Track
Other
device
OK
PROFINET
IO Device
Other
device
OK
6 Installation
PROFINET
IO Device
Other
device
NG
(c) Common Ground: Incorrect
PROFINET
IO Device
DIN Track
Other
device
NG
(c) Common Ground: Incorrect
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