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l
For I/O Power Supply
Current
Breaking/fusing
time
6 A
1 min max.
12 A
15 s max.
21 A
5 s max.
30 A
2.5 s max.
Installation Locations for Protective Devices
Install protective devices for the Unit power supply and I/O power supply in the locations that are
shown in the following figure.
External devices
End
Cover
Built-in I/O
Internal
circuits
NX Unit power supply
Unit power supply
terminals
Internal
power
supply
circuit
Unit power
supply
(24 VDC)
NX-series
NX1P2 CPU
Unit
Protective
device
Protective
device
I_unit1
I_ioB
I_unit2
I_io1
I_io2
I/O power
supply
I/O power
supply
Block that the CPU 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.
Block that an Additional NX Unit Power Supply
Unit supplies Unit power supply.
External devices
Power
supply
NX power supply
Unit power
supply terminals
I/O power
supply
terminal
I/O power
supply
terminal
Cn(+V)/0Vn
terminal PNP
(sourcing)
type only
I/O power supply
(24 VDC, etc.)
Additional
NX Unit
Power
Supply Unit
○
○
○
○
○
○
○
○
○
○
Protective
device
Protective
device
Protective
device
Additional
I/O Power
Supply
Unit 1
Additional
I/O Power
Supply
Unit 2
However, fewer protective devices may be required when the current consumption of each block does
not exceed the rated current.
An example of this is provided below.
• Using Unwired Unit Power Supply Terminals
In this example, the current consumption from each power supply is as follows:
Current consumption from Unit power supply: I 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
4-26
NX-series NX1P2 CPU Unit Hardware User’s Manual (W578)
Содержание NX1P2 series
Страница 8: ...Manual Structure 6 NX series NX1P2 CPU Unit Hardware User s Manual W578...
Страница 52: ...Revision History 50 NX series NX1P2 CPU Unit Hardware User s Manual W578...
Страница 82: ...2 System Configuration 2 10 NX series NX1P2 CPU Unit Hardware User s Manual W578...
Страница 170: ...a b Flat blade screwdriver 1 2 5 Installation and Wiring 5 26 NX series NX1P2 CPU Unit Hardware User s Manual W578...
Страница 174: ...4 Close the Memory Card cover 5 Installation and Wiring 5 30 NX series NX1P2 CPU Unit Hardware User s Manual W578...
Страница 176: ...4 Close the Memory Card cover 5 Installation and Wiring 5 32 NX series NX1P2 CPU Unit Hardware User s Manual W578...
Страница 224: ...0 4 mm Side view Front view 2 5 mm 5 Installation and Wiring 5 80 NX series NX1P2 CPU Unit Hardware User s Manual W578...
Страница 258: ...Appendices A 10 NX series NX1P2 CPU Unit Hardware User s Manual W578...
Страница 259: ...I Index I 1 NX series NX1P2 CPU Unit Hardware User s Manual W578 I...
Страница 262: ...Index I 4 NX series NX1P2 CPU Unit Hardware User s Manual W578...
Страница 263: ......