Internal
circuits
NX Unit power supply
NX-series NX1P2
CPU Unit
Built-in I/O
Unwired
terminal
Unit power supply
(24 VDC)
I_unit1 + I_unit2
I_ioB
Cn(+V)/0Vn
terminal
PNP (sourcing)
type only
I/O power supply
(24 VDC, etc.)
End
Cover
I/O power
supply
I/O power
supply
I/O power
supply
terminal
External devices External devices
I_unit2
I_io1
Unit power supply terminals
I_io2
Additional
I/O Power
Supply
Unit 1
Additional
I/O Power
Supply
Unit 2
Additional
NX Unit
Power
Supply Unit
Unit power supply
terminals
I_unit1
I/O power
supply
terminal
Block that the CPU Unit supplies Unit power supply.
Block that an Additional NX Unit Power Supply
Unit supplies Unit power supply.
Block that an Additional I/O
Power Supply Unit 1 supplies
I/O power supply.
Block that an Additional I/O
Power Supply Unit 2 supplies
I/O power supply.
NX Unit power supply
Internal
power
supply
circuit
Power
supply
○
○
○
○ ○ ○ ○ ○ ○ ○ ○
Protective
device
Protective
device
Protective
device
Protective
device
• When Total Current Consumption for All Blocks Does Not Exceed the Rated Current
In this example, the current consumption from each power supply is as follows:
Current consumption from Unit power supply: I_unit1 + I_unit2 ≤ Lowest rated current
Current consumption from I/O power supply for NX Units: I_io1 + I_io2 ≤ 4 A (rated current for
I/O power supply)
4 Designing the Power Supply System
4-27
NX-series NX1P2 CPU Unit Hardware User’s Manual (W578)
4-4 Selecting External Power Supplies and Protective Devices
4
4-4-3 Selecting Protective Devices
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