Omron NX Series Hardware User Manual page 85

I/O Power Supply to NX Units
Power supply to the X
Bus Unit power supply
External connection ter-
minals
*1. Includes the End Cover (NX-END02), and does not include projecting parts.
*2. Includes the End Cover (NX-END02). The weight of the End Cover is 82 g.
*3. Includes an SD Memory Card. The NX Unit power consumption to NX Units is not included.
*4. The inrush current that occurs when the supplied power is changed to ON from a continuous OFF state.
The inrush current may vary depending on the operating condition and other conditions. Therefore, select
fuses, breakers, and external power supply devices that have enough margin in characteristic and capacity,
considering the condition under which the devices are used.
In particular, in case when you insert a switch to turn ON/OFF the DC power supplied from an external pow-
er supply, if the duration of an ON-OFF-ON cycle is one second or less, the inrush control circuit may not
function, which cause an inrush current of approximately 30 A/0.3 ms.
*5. The amount of current that can be passed constantly through the terminal. Do not exceed this current value
when you use a through-wiring for the Unit power supply.
*6. When the type of the I/O power supply to NX Units you use is the supply from NX bus, an Additional I/O
Power Supply Unit is required. Refer to 4-3 Designing the I/O Power Supply System on page 4-14 for de-
tails.
*7. The X Bus Unit power is supplied directly from the Unit power (24 VDC) supplied to the CPU Unit. Since the
voltage is not transformed in the CPU Unit, there is no definition of supply efficiency.
NX-series NX502 CPU Unit Hardware User's Manual (W629)
Item
X Bus Unit power supply
capacity
*7
Isolation method
Communications connector
Screwless clamping termi-
nal block
Output terminal (service
supply)
RUN output terminal
NX bus connector
3 Configuration Units
Specification
*6
Not provided
50 W max.
No isolation: between the Unit power supply ter-
minal and X Bus Unit power supply
RJ45 for Ethernet Communications × 2
RJ45 for EtherCAT Communications × 1
For Unit power supply input and grounding (Re-
movable)
Not provided
Not provided
63 NX Units can be connected
3
3-3