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4 Installation and Wiring
NX-series Position Interface Units User’s Manual (W524)
4-4 Wiring Precautions
4
4-4 Wiring Precautions
Electronic control equipment may malfunction due to noise from surrounding power supply lines and
external loads.
Malfunctions due to noise are difficult to reproduce, and it can take some time to determine what the
cause of the problem is. Observe the following precautions to prevent noise-related malfunctions and to
increase the reliability of your system.
• Use the correct diameters of wires and cables according to the documentation for your motor drives,
encoders, and other equipment.
Wire power lines (AC power supply lines and motor power lines) separately from control lines (pulse
I/O lines and external I/O signal lines). Never place these wires in the same duct or bundle them
together.
• Do not share the power supply for the external I/O of a Position Interface Unit with I/O power supply
for another Unit.
The I/O power supply terminals on an NX Unit are connected to the I/O power supply terminals on
the other NX Units in the Slave Terminal through the NX bus connectors. If a Slave Terminal contains
one or more Position Interface Units together with one or more other Units, use an Additional I/O
Power Supply Unit to separate the I/O power supply.
• Use sheathed shielded cables for control lines.
• Always install a surge absorber on an inductive load (relay or solenoid).
I/O power
supply
I/O power
supply
Position Interface
Units
Other I/O
Units
Additional I/O
Power
Supply Unit
The I/O power supply terminals are inter-
nally connected in the NX Units. You can
use an Additional I/O Power Supply Unit
to separate the I/O power supply.
Pulse I/O signals
(Motor drives, encoders, etc.)
Other I/O signals
(Relays, lamps, etc.)
Surge absorber
DC Relays
AC Relays
Diode for
absorbing
surge
Solenoids
Surge absorber
(Example: Okaya Electric Industries CR-50500)
+
−
DC
RY RY
AC
SOL
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