OMRON Machine Automation Controller NX-series System Units

The OMRON NX series system unit (power/shielding/connection unit) user manual (W523-E1-10) is designed for four types of modules: NX-PD/PF/PC/TBX. It provides detailed information on system composition, specifications, installation and wiring, terminal usage, fault diagnosis, and maintenance. It specifies core specifications such as 24VDC power supply, spring screw free terminals, TS/UNIT PWR/I/O PWR indicator lights, 100 Ω grounding, and anti misconnection coding pins, covering three application architectures: CPU rack, slave terminal, and secure network controller. It is an authoritative guide for NX series power expansion and wiring.

Module core specifications

General Specifications

Parameter indicators

Working temperature 0~55 ℃

Humidity 10~95% RH (no condensation)

Grounding ≤ 100 Ω

Pollution level 2

Overvoltage category II

Insulation withstand voltage 510VAC/1min

Power module specifications

Model Function Voltage Maximum Current

NX PD1000 NX unit power supply 24VDC 10W

NX PF0630 I/O power supply 5~24VDC 4A

NX PF0730 I/O power supply 5~24VDC 10A

NX PC00xx I/O power adapter -4A/terminal

NX – TBX01 Shielded Grounding -14 Channel SHLD

System composition

CPU rack architecture

CPU unit+NX system unit+I/O unit+end cap

Slave terminal architecture

EtherCAT coupler+NX system unit+I/O unit+end cap

Security Controller Architecture

Communication control unit+security CPU+NX system unit+end cover

Installation specifications

Installation method

DIN 35mm rail installation, vertical forward direction

Module splicing: alignment of guide slots, locking of yellow slider

Prohibited items

Power on disassembly and assembly, touching NX bus pins, labeling/writing restricted areas

Distance requirements

Adequate space for upper and lower heat dissipation, with cables supported by force

Core wiring specifications

1. Power supply classification

Unit Power: Provides power to the controller and modules internally

I/O Power: Provides power to sensors/actuators

Requirement: The two channels must be independently powered to avoid noise interference

2. Screw free terminal operation

Applicable wire diameter: 0.08~2.0mm ²

Plug in: directly push in; Wiring: Insert a slanted straight screwdriver (10-15 °)

High current (>2A) must use tin plated wire or cold pressed terminals

Binding: Binding at a distance of * * ≤ 30mm * * from the terminal

3. Anti misplacement coding pin

Code sales: NX-AUX02

6 hole combinations with 20 different codes to prevent incorrect terminal connections

4. Shielding grounding

NX-TBX01 provides 14 SHLD terminals, uniformly grounded to reduce interference

Functional grounding: ≤ 100 Ω, single point grounding

Status indication and diagnosis

LED status

Meaning of indicator light status

TS (green) is always on and running normally

TS (flashing green for 2s) initialization/download normal waiting

TS (red) constantly on, hardware failure

TS (flashing red for 1 second) bus communication abnormality check connection

UNIT PWR green NX unit power supply is normal

I/O PWR green I/O power supply is normal

Key Event Code

Event code fault handling

00200000 hex non-volatile memory hardware failure reboot/replacement unit

9040000hex event log clearing normal operation

Maintenance and Inspection

routine inspection

Indicator lights, wiring, terminals, heat dissipation

Regular inspection (6-12 months)

Voltage measurement, terminal torque, ambient temperature and humidity, grounding

clean

Wipe with a dry cloth; Dilute oil stains with 2% cleaning agent

Prohibited use: thinner, benzene, chemicals

Key issues

Question: Why must the unit power supply and I/O power supply of NX series system units be separated? What are the risks of not separating? 

Answer: The unit power supply is responsible for the internal power supply of the controller and module, while the I/O power supply is responsible for the external load power supply; Separation can prevent load noise from entering the control system. Failure to separate can lead to misoperation, communication abnormalities, and module damage, which is a mandatory safety regulation.

Question: What are the mandatory requirements for wire diameter, cold pressed terminals, and binding distance when using screw free terminal wiring? 

Answer: Applicable wire diameter is 0.08~2.0mm ²; If the current is greater than 2A, tin plated wire or cold pressed terminals must be used; The cable must be tied and fixed within 30mm from the terminal to prevent pulling and loosening.

Question: What on-site pain points do the four types of units NX PD/PF/PC/TBX solve? What are their respective core purposes? 

answer:

PD: Solve the problem of insufficient CPU power supply and expand the NX unit power supply;

PF: Solve the problem of I/O total current exceeding the limit, expand I/O power supply and achieve partition isolation;

PC: Solve the problem of insufficient I/O power terminals and provide multiple adapter terminals;

TBX: Solve the problem of disorderly shielding and grounding of multiple cables, and unify shielding and grounding to reduce interference.