5 Installation and Wiring
5 - 78
NX-series NX1P2 CPU Unit Hardware User’s Manual (W578)
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.
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.
• Never bundle output signal lines with high-voltage or power lines, and do not route them in close
proximity or parallel to such lines.
If output signal lines must be routed in close proximity to such lines, place them in separate ducts or
conduits. Be sure to ground the ducts or conduits.
Wire Layout for the Power Supply System
Wiring External I/O Signal Lines
Unit power supply for Controller
I/O power supply for Controller
Power Supply System Diagram
Power circuits
Power supply for general operations circuits
Outlet (for peripheral devices)
I/O power supply for Controller
Noise
filter
Input Signal Noise Countermeasures
DC
Input
Unit,
Built-in
Input
Inductive
load
Diode
Connect a diode in a DC circuit.
Output Signal Noise Countermeasures
Output
Unit
Output
Unit
Connect a diode
in a DC circuit.
Connect a surge
suppressor in an AC circuit.
Inductive
load
Diode
Inductive
load
Surge
suppressor
I/O Cable Arrangement
Floor ducts ConduitsSuspended ducts
I/O cables
I/O cables
Power lines
Power lines
I/O cables
Power lines
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