Omron PROFINET NX-PNC202 User Manual page 121

• Keep the wiring between the transformer and the Profinet IO Device Terminal as short as possible,
twist the wires well, and keep the wiring separate from high-voltage and power lines.
 Supplying IO Power from the NX Bus
 Supplying IO Power from External Sources
Wiring External IO Signal Lines
Observe the following points when wiring external IO signal lines.
• To absorb reverse electromotive force when an inductive load is connected to an output signal, con-
nect a surge suppressor near the inductive load in an AC circuit, or connect a diode near the induc-
tive load in a DC circuit.
Inductive
load
Connect a diode in a DC circuit.
Input Signal Noise Countermeasures
NX-series PROFINET Coupler Unit User's Manual (W623)
Power circuits
Power supply for general operations circuits
I/O power supply for PROFINET IO Device
Noise
filter
Power Supply System Diagram
Power circuits
Power supply for general operations circuits
Power supply for input circuits of PROFINET IO Device
Power supply for output circuits of PROFINET IO Device
Noise
filter
Power Supply System Diagram
DC
Diode
Input
Unit
Connect a surge
suppressor in an AC circuit.
Unit power supply for PROFINET IO Device
Outlet (for peripheral devices)
Unit power supply for PROFINET IO Device
Outlet (for peripheral devices)
Surge
suppressor
Inductive
load
Output
Unit
Output Signal Noise Countermeasures
6 Installation
Inductive Diode
load
Output
Unit
Connect a diode
in a DC circuit.
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