Omron NX701-1700 User Manual page 129

Wire Layout for the Power Supply System
Observe the following points when wiring the power supply system.
• Separate the Controller power supply from the I/O device power supply and install a noise filter near
the Controller power supply feed section.
• Use an isolating transformer to significantly reduce noise between the Controller and the ground.
Install the isolating transformer between the Controller power supply and the noise filter, and do not
ground the secondary coil of the transformer.
• Keep the wiring between the transformer and the Controller as short as possible, twist the wires well,
and keep the wiring separate from high-voltage and power lines.
Wiring External I/O Signal Lines
Observe the following points when wiring external I/O 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 CPU Unit Hardware User's Manual (W535)
Power circuits
Power supply for general operations circuits
I/O power supply for Controller
I/O power supply for Controller
Noise
filter
Power Supply System Diagram
DC
Input
Unit
Diode
Output
Unit
Connect a surge
suppressor in an AC circuit.
Unit power supply for Controller
Outlet (for peripheral devices)
Surge
suppressor
Inductive
load
Output Signal Noise Countermeasures
4 Installation and Wiring
Inductive Diode
load
Output
Unit
Connect a diode
in a DC circuit.
4
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