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Omron NX-PD1000 NX unit power supply — 12 mm wide NX-series module with the orange locking slider visible on the right side, screwless push-in terminal block on top with 8 terminals (IOV/V+, IOG/V−, FG pairs)

Omron NX-PD1000 — Additional NX-Bus Unit Power Supply

SKU: NX-PD1000

USD 33.00

Additional NX-series unit power supply, 24 VDC input (20.4–28.8 VDC), provides up to 10 W extra NX-Bus unit power when EtherCAT coupler capacity is exhausted, screwless push-in terminal, 12 mm wide.

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Product Overview

The NX-PD1000 is an additional unit power supply for the NX-series modular I/O system. It accepts 24 VDC input (allowable 20.4 to 28.8 VDC) and provides up to 10 W of extra NX-Bus unit power to downstream NX Units when the host EtherCAT Coupler (NX-ECC201, NX-ECC202, or NX-ECC203) has reached its unit-power budget. The unit is only 12 mm wide — the same footprint as a single NX I/O Unit — and uses the same screwless push-in terminal block as the rest of the NX family (8 terminals: 2 × IOV/V+, 2 × IOG/V−, 2 × FG, plus a duplicate pair for through-wiring).

Why a separate NX-PD1000 when the coupler already has power

Every NX EtherCAT Coupler supplies two separate 24 VDC power rails to the downstream NX Units: the NX-Bus unit power (which powers the internal logic of each NX Unit, the EtherCAT slave communication, and the unit microcontroller) and the I/O power (which drives the field side of digital inputs, digital outputs, analog signals, etc.). The coupler's unit-power capacity is limited — the NX-ECC201 supplies about 10 W, the NX-ECC202 about 10 W, and the NX-ECC203 about 16 W — and that budget has to cover every NX Unit in the slice.

NX-PD1000 vs NX-PF0630 vs NX-PF0730 — what's actually different

The NX-series System Unit family has three 'additional power' modules and they are not interchangeable. NX-PD1000 (this SKU) adds unit power to the NX-Bus. NX-PF0630 adds I/O power — it accepts 5 to 24 VDC and feeds up to 4 A of I/O power to the field side of the downstream NX Units. NX-PF0730 does the same I/O power injection but at 10 A maximum current. The rule of thumb: if your NX-IO Units are randomly dropping off the network with 'unit power supply error' faults, you need an NX-PD1000 (unit-power problem).

Installation and current budget calculation

The NX-PD1000 installs like any other NX Unit: line up the alignment markers on the side of the unit with the previously installed unit, press the orange locking slider toward the back of the unit to lock it to the bus, and slide on the next NX Unit. Connect 24 VDC to the input terminals (IOV/V+ and IOG/V−), then run a Sysmac Studio I/O Map build to confirm the NX-PD1000 reports 'Unit power supply normal' on the diagnostics tab. For current budgeting: each downstream NX Unit's unit-power draw is listed in the NX Unit's datasheet under 'Current consumption (Unit power supply)'.

Key Features

  • Additional NX-Bus unit power supply, 24 VDC input
  • Provides up to 10 W extra NX-Bus unit power downstream of the EtherCAT coupler
  • Used when NX-ECC201 / NX-ECC202 / NX-ECC203 unit-power capacity is exhausted
  • Screwless push-in terminal block, 8 terminals
  • 12 mm wide — same footprint as a standard NX I/O Unit
  • Non-isolated design, 70 % typical efficiency
  • Through-wiring current capacity 4 A maximum
  • Up to four NX-PD1000 units can be cascaded in one slice
  • SKU: NX-PD1000
  • Series: NX-series System Unit
  • Voltage: 24 VDC
  • I/O: 24 I/O

Best-Fit Applications

  • Adding unit power to an NX slice with >10 NX Units that has exceeded NX-ECC201 / NX-ECC202 unit-power capacity
  • Powering an NX slice with high-speed analog input units downstream of the coupler
  • Splitting unit power across multiple cascaded NX-PD1000 units in a 40+ NX Unit slice
  • Phased migration of an NX slice — add NX-PD1000 in the middle as new Units are appended

Buying Checklist

  • Pick NX-PD1000 when NX Unit power capacity is exhausted
  • Pick NX-PF0630 when I/O power is exhausted at the 4 A level
  • Pick NX-PF0730 when I/O power is exhausted at the 10 A level
  • Pick NX-PC0020 I/O power connection unit when you need to break the I/O power feed into isolated groups
  • Add up each downstream NX Unit's 'Current consumption' from its datasheet before sizing NX-PD1000 count
  • Sysmac Studio does not auto-calculate unit-power budgets — this is a manual exercise

Technical Specifications

Model NX-PD1000
Series NX-series System Unit
Type Additional NX Unit power supply
I/O System NX I/O Bus (EtherCAT slave slice)
Input Voltage 24 VDC (allowable 20.4 to 28.8 VDC)
NX-Bus Power Supply Capacity 10 W max (to downstream NX Units)
NX Unit Power Supply Efficiency 70 % typical
Through-Wiring Current Capacity 4 A max (including downstream)
Dimensions 12 (W) × 100 (H) × 71 (D) mm
Operating Temperature 0 to +55 °C
Mounting NX DIN-rail segment, locked via orange slider

FAQ for NX-PD1000

When do I need an NX-PD1000?
You need an NX-PD1000 when your NX EtherCAT slice has more NX Units than the coupler's NX-Bus unit-power budget can supply. Symptoms in Sysmac Studio are NX Units showing 'Unit power supply error' in the Coupler/Unit diagnostics tab, Units randomly appearing and disappearing from the I/O Map, or NX Units that fail to register at all when you try to add them to the slice.
What is the difference between NX-PD1000, NX-PF0630, and NX-PF0730?
Three different power-injection functions. NX-PD1000 (this SKU) injects NX-Bus unit power — it powers the internal logic, EtherCAT communication, and microcontrollers of the downstream NX Units. NX-PF0630 injects I/O power — it powers the field side of digital inputs, digital outputs, analog signals, and encoder interfaces — at up to 4 A. NX-PF0730 does the same I/O power injection at up to 10 A.
Can the NX-PD1000 be used with an NX102 or NX502 CPU instead of an EtherCAT Coupler?
Technically yes — the NX-PD1000 will install in any NX slice and inject unit power — but it is unnecessary in a CPU-based slice. The NX102, NX502, and NX1P2 CPU units already supply unit power themselves; their limitation is on the I/O power side, which is why NX-PF0630 and NX-PF0730 are commonly added to CPU-based slices but NX-PD1000 is rarely needed. The NX-PD1000 is essentially an EtherCAT-Coupler-slice solution for the unit-power-exhaustion problem.
Does the NX-PD1000 need a separate 24 VDC supply?
Yes — the NX-PD1000 accepts 24 VDC input on its screwless push-in terminal block (IOV/V+ and IOG/V−) and does not derive its input from the NX-Bus. In practice you wire it to the same cabinet 24 VDC bus that powers the EtherCAT Coupler (typically an S8VK-G12024 or S8VS-12024), with its own fuse or branch breaker so you can isolate it for maintenance. The FG terminals should be grounded at one end of the cabinet ground bus to ensure EMC compliance.

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