Omron Sysmac NX-PD1000 User Manual page 78

4 Installation and Wiring
Unit name
Additional I/O Power Sup-
ply Unit
4 - 18
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
Case (a)
Communications NX Unit
Coupler Unit
Internal
power
supply
circuit
I/O power
supply
Unit power
supply
Case (b)
Communications NX Unit
Coupler Unit
Internal
power
supply
circuit
I/O power
supply
Unit power
supply
- When different I/O power supply voltage are used.
- 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.
Function
Separated by Additional I/O
Power Supply Unit
Additional I/O
Power Supply Unit
I/O power
supply
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
Separated by Additional I/O
Power Supply Unit
Additional I/O
Power Supply Unit
I/O power
supply
NX-series System Units User's Manual (W523)