- When different I/O power supply voltage are used.
- When separating the power supply systems.
NX Unit NX Unit NX Unit
End
Cover
Separated by the
Additional I/O Power
Supply Unit
NX-series NX1P2
CPU Unit
Unit power supply terminals
Internal
power
supply
circuit
Internal
circuits
NX Unit power supply
Unit power
supply
(24 VDC)
I/O power supply
terminals
Additional
I/O Power
Supply
Unit
Additional
I/O Power
Supply
Unit
I/O power supply
(12 VDC, etc.)
I/O power supply
(24 VDC, etc.)
○
○ ○ ○ ○ ○
I/O power supply I/O power supply
NX bus connector
I/O power supply terminals
I/O power supply voltage
24 VDC
I/O power supply voltage
12 VDC
I/O Power Supply Connection Unit
You can add an I/O Power Supply Connection Unit to provide additional I/O power supply terminals if
required to connect external devices to a Digital I/O Unit or Analog I/O Unit.
The following figure shows how to use I/O Power Supply Connection Units. Assume that a PNP-type
Digital Input Unit, NX-ID5342, is used to input signals from a two-wire sensor and a three-wire sensor
with NPN output. The NX-ID5342 Digital Input Unit does not have I/O power terminals. For the Digital
Input Unit, you need to prepare IOG terminals for the two-wire sensor, and IOV terminals as well as
IOG terminals for the three-wire sensor
. Insert two I/O Power Supply Connection Units: one is NX-
PC0020 with 16 IOV terminals, and the other is NX-PC0010 with 16 IOG terminals. Wire them as
shown in the figure below.
The NX Unit power supply line as well as the I/O power supply line is connected between the I/O Pow-
er Supply Connection Units and adjacent NX Units through the NX bus.
4 Designing the Power Supply System
4-8
NX-series NX1P2 CPU Unit Hardware User’s Manual (W578)
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