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Part of the Omron NX-Series Safety & I/O series — see the full model table, lifecycle status and replacement parts.

Omron NX-AD4204 — front face of the 8-channel 4 to 20 mA differential analog input unit showing the screwless push-in 16-terminal block, the TS indicator and the NX-AD4204 type label

Omron NX-AD4204 — 8-Ch 4-20 mA Analog Input

SKU: NX-AD4204

USD 200.00

NX 8-ch 4 to 20 mA differential analog input, 1:8000, 250 us/ch, 12 mm wide. In stock, China.

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Product Overview

The Omron NX-AD4204 is an NX-series 8-channel 4 to 20 mA differential analog input unit with a 1/8000 resolution It is manufactured by Omron Corporation. Hengyixin Automation stocks this I/O expansion unit in Xiamen and ships within 3-5 business days to most Asian, European, and North American ports. Specifications on this page were checked against Omron's NX-series I/O System brochure (R183).

Each of the eight channels accepts a 4 to 20 mA signal in differential mode and converts it to a 13-bit value at 250 us per channel. Absolute maximum rating is +/-30 mA.

Mount on any NX-ECC201 / ECC202 / ECC203 EtherCAT Coupler. Key specs: Number of Inputs 8 channels; Input Type 4 to 20 mA differential; Input Conversion Range -5 to 105 percent of full scale; Absolute Maximum Rating +/-30 mA; Input Impedance 85 ohm; Resolution / Accuracy 1/8000 (13-bit); +/-0.2 percent FS at 25 degC, +/-0.4 percent FS at 0 to 55 degC; Conversion Time / Refreshing 250 us per channel (2 ms per unit); Free-Run only; per-channel disconnection detection; 1.05 W NX-bus max; External Connection Screwless push-in 16-terminal block (removable).

Key Features

  • NX-series 8-channel 4 to 20 mA differential analog input
  • 1/8000 (13-bit) resolution, 250 us per channel conversion, Free-Run refreshing only
  • Absolute maximum +/-30 mA, 85 ohm input impedance, disconnection detection per channel
  • Screwless push-in 16-terminal block, 12 x 100 x 80 mm, 70 g, IP20, 1.05 W NX-bus max
  • SKU: NX-AD4204
  • Series: NX-series Analog Input Unit (current)

Best-Fit Applications

  • Spare replacement where the existing NX-AD4203 single-ended wiring is replaced with differential for better noise rejection on long cable runs
  • Reading eight 4-20 mA pressure transducer loops on a hydraulic press and scaling them to bar in the NJ501 PLC every cycle
  • Monitoring tank level from eight loop-powered ultrasonic level probes on a CIP cleaning line in a beverage plant

Buying Checklist

  • Choose the NX-AD4208 instead when 1/30000 resolution or Synchronous I/O refreshing is required for higher-precision weighing.
  • Choose the NX-AD4204 when the eight 4-20 mA inputs are differential and Free-Run refreshing is enough at 2 ms per unit.
  • Choose the NX-AD4203 instead when the sensors share a common ground and single-ended wiring is acceptable on the same 12 mm body.

Technical Specifications

Manufacturer Omron Corporation (Japan)
Series NX-series Analog Input Unit (current)
Model / SKU NX-AD4204
Number of Inputs 8 channels
Input Type 4 to 20 mA differential
Input Conversion Range -5 to 105 percent of full scale
Absolute Maximum Rating +/-30 mA
Input Impedance 85 ohm
Resolution / Accuracy 1/8000 (13-bit); +/-0.2 percent FS at 25 degC, +/-0.4 percent FS at 0 to 55 degC
Conversion Time / Refreshing 250 us per channel (2 ms per unit); Free-Run only; per-channel disconnection detection; 1.05 W NX-bus max
External Connection Screwless push-in 16-terminal block (removable)
Dimensions / Approvals 12 (W) x 100 (H) x 80 (D) mm; 70 g; IP20; cULus, CE, RCM

Manufacturer documentation

Omron's own product page, where the manufacturer's current specification and lifecycle information are published. We are an independent distributor and cannot mirror those documents; the link goes to Omron's site.

FAQ for NX-AD4204

What is the difference between NX-AD4203 and NX-AD4204?
Both are 8-channel 4 to 20 mA current inputs on the same 12 mm slice. The AD4203 is single-ended and provides the I/O power supply from the NX bus to drive 2-wire transmitters. The AD4204 is differential and gives better common-mode noise rejection in noisy industrial cabinets. Both use the screwless push-in 16-terminal block on the back of the unit.
Does the NX-AD4204 support Synchronous I/O refreshing?
No. The NX-AD4204 supports Free-Run refreshing only at the 1/8000 resolution. For Synchronous I/O at higher resolution, pick the NX-AD4208 (1/30000, Synchronous I/O selectable) on the same 12 mm slice at a different price point today.
Does the NX-AD4204 detect a disconnected sensor?
Yes. The NX-AD4204 supports per-channel disconnection detection. When a 4-20 mA loop is broken, the input reads below 4 mA and the disconnection flag is set in Sysmac Studio. The PLC program can read the flag and trigger an alarm or stop the process immediately.
Can the NX-AD4204 mount on an EtherCAT coupler?
Yes. The NX-AD4204 mounts on the NX-ECC201, ECC202 or ECC203 EtherCAT Coupler, on the NX-EIC202 EtherNet/IP Coupler, or directly on the NX102 modular CPU bus. The 12 mm width keeps eight slices under 100 mm of DIN rail space.

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