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4 - 13
4 Installation and Wiring
NX-series Digital I/O Unit User’s Manual (W521)
4-2 Wiring
th
e Power Sup
p
ly t
o
th
e Slave T
ermin
al
4
4-
2-4 Pow
er Supply-
related U
nit
s for
the NX-series
Additional I/O Power Sup-
ply Unit
This NX Unit provides additional I/O power supply.
Use this NX Unit in the following cases.
(a) When the I/O power supply capacity is insufficient
• When the total current consumption for the I/O power supply exceeds the max-
imum current of I/O power supply of the Communications Coupler Unit
• When a voltage drop in the I/O power supply causes the voltage of the I/O
power supply to go below the voltage specifications of the I/O circuits or con-
nected external devices
(b) Separating the I/O power supply
• When connected external devices have different I/O power supply voltages
• When separating the power supply systems
The NX Unit power supply of the Additional I/O Power Supply Unit is connected to
the NX Unit on the left through the NX bus connector.
Unit name
Function
- When different I/O power supply voltage are used.
- When separating the power supply systems.
When the I/O power supply
becomes the following states
for the subsequent NX Units.
- When it exceeds the maximum
current of I/O power supply
- When it goes below the voltage
specifications of the connected
external devices
I/O power
supply
Unit power
supply
Case (b)
I/O power
supply
Internal
power
supply
circuit
Case (a)
Communications
Coupler Unit
NX Unit
I/O power
supply
Unit power
supply
I/O power
supply
Additional I/O
Power Supply Unit
Separated by Additional I/O
Power Supply Unit
Internal
power
supply
circuit
Communications
Coupler Unit
NX Unit
Additional I/O
Power Supply Unit
Separated by Additional I/O
Power Supply Unit
Summary of Contents for NX-IA3117
Page 34: ...Sections in this Manual 32 NX series Digital I O Unit User s Manual W521...
Page 52: ...1 Features and System Configuration 1 18 NX series Digital I O Unit User s Manual W521...
Page 56: ...2 Specifications 2 4 NX series Digital I O Unit User s Manual W521...
Page 152: ...5 I O Refreshing 5 36 NX series Digital I O Unit User s Manual W521...
Page 204: ...8 Digital Mixed I O Units 8 8 NX series Digital I O Unit User s Manual W521...
Page 224: ...9 Troubleshooting 9 20 NX series Digital I O Unit User s Manual W521...
Page 230: ...10 Inspection and Maintenance 10 6 NX series Digital I O Unit User s Manual W521...
Page 337: ...I 1 I NX series Digital I O Unit User s Manual W521 Index...
Page 340: ...I 4 NX series Digital I O Unit User s Manual W521 Index...