Part of the Omron NX-Series Safety & I/O series — see the full model table, lifecycle status and replacement parts.
Omron NX-AD4203 — 8-Ch 4-20 mA Analog Input, 1/8000
SKU: NX-AD4203USD 202.00
Omron NX-AD4203 NX-series 8-point analog input, 4-20 mA single-ended, 1/8000 (13-bit), 250 us. In stock, China shipping.
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Product Overview
The Omron NX-AD4203 is the NX-series 8-channel analog input unit for 4 to 20 mA current loops, 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).
It sits on the NX I/O bus behind an NX-ECC201 EtherCAT Coupler or on the right of an NX102 / NX1P2 CPU and reads eight 4-20 mA signals as single-ended inputs. Resolution 1/8000 of full scale (13-bit), conversion time 250 us per point, Free-Run refreshing only.
Input impedance 85 Ohm, absolute maximum +/-30 mA, accuracy 25 C +/-0.2 percent FS. Screwless push-in 16-terminal connector, NX-bus powered at 1.40 W max on CPU and 1.05 W on Coupler. Input disconnection detection is supported. The 4-channel sibling is NX-AD3203. For differential inputs use NX-AD4204; for higher resolution use NX-AD4208 (1/30000).
Key Features
- NX-series 8-channel analog input unit, 4 to 20 mA, single-ended input, input impedance 85 Ohm
- Resolution 1/8000 of full scale (13-bit), conversion time 250 us per point, Free-Run refreshing only
- Screwless push-in 16-terminal connector, NX bus-powered, 1.40 W max on CPU, 1.05 W max on Coupler
- Input disconnection detection supported, transformer + digital isolator between input and NX bus
- SKU: NX-AD4203
- Series: NX-series Analog Input Unit (NX-AD family) on NX I/O Bus
- I/O: 8 I/O
Best-Fit Applications
- Bottling-line flow loop where eight 4-20 mA magnetic flowmeters feed an NX102-1200 with the NX-AD4203 sampling Free-Run at 250 us per point
- Process-skid pressure skid where eight 4-20 mA pressure transmitters land on a single 12 mm slice to save rack space behind the NX-ECC201
- Spare replacement on a wastewater cell where the original NX-AD4203 was lost and Sysmac Studio holds the channel scaling and disconnection alarms
Buying Checklist
- Pick the NX-AD4203 when the cell needs eight 4-20 mA single-ended inputs at 1/8000 resolution and 250 us conversion on a 12 mm slice.
- Pick the NX-AD4204 instead when the transmitters are to 8 in differential mode at the same 1/8000 resolution and 250 us conversion.
- Pick the NX-AD4208 instead when the application needs 1/30000 high resolution and 10 us conversion with selectable Synchronous or Free-Run refreshing.
Technical Specifications
| Manufacturer | Omron Corporation (Japan) |
|---|---|
| Series | NX-series Analog Input Unit (NX-AD family) on NX I/O Bus |
| Model / SKU | NX-AD4203 |
| Number of Points | 8 analog inputs, single-ended |
| Input Range | 4 to 20 mA (input conversion range -5 to 105 percent of full scale) |
| Resolution / Conversion | 1/8000 of full scale (13-bit); 250 us per point; Free-Run refreshing |
| Accuracy | 25 C +/-0.2 percent full scale; 0 to 55 C +/-0.4 percent full scale |
| Input Impedance / Max | 85 Ohm; absolute maximum +/-30 mA |
| Connection / Power | Screwless clamping terminal block (16 terminals); NX bus-powered; no external I/O supply |
| NX Unit Power | 1.40 W max on CPU or Communication Control Unit; 1.05 W max on Coupler |
| Isolation | Transformer (power) + digital isolator (signal) between input and NX bus; no isolation between inputs; dielectric 510 VAC for 1 minute |
| Dimensions / Approvals | 12 (W) x 100 (H) x 71 (D) mm; 70 g; IP20; 0 to 55 C ambient; SIL None; CE, cULus, RCM, KC, Lloyd, NK |
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-AD4203
What is the Omron NX-AD4203 used for?
It is the NX-series 8-channel analog input unit for 4-20 mA single-ended current loops at 1/8000 (13-bit) resolution and 250 us per point conversion. Typical uses are bottling-line flow loops, process-skid pressure transmitters, and spare replacement on wastewater cells where Sysmac Studio holds the channel scaling.
NX-AD4203 vs NX-AD4204 - what is the difference?
Both are NX-series 8-channel 4-20 mA analog input units at 1/8000 (13-bit) resolution and 250 us per point on a 12 mm slice. The AD4203 is single-ended; the AD4204 is differential. Pick the AD4203 when the transmitters share a common ground at the panel; pick the AD4204 when the transmitters are isolated or run long cable runs in noisy environments.
Does the NX-AD4203 need an external 24 VDC power supply?
No external I/O supply. The slice draws 1.40 W from the NX bus when mounted on a CPU or Communication Control Unit, and 1.05 W when mounted on an NX-ECC201 / ECC202 / ECC203 EtherCAT Coupler. There is no I/O current consumption, and no IOV terminals on the connector - just the eight 4-20 mA signal pairs.
What is the difference between NX-AD4203 and NX-AD4208?
Both are 8-channel 4-20 mA analog input units on a 12 mm slice. The AD4203 has 1/8000 resolution and 250 us conversion in Free-Run mode only. The AD4208 has 1/30000 resolution and 10 us conversion with selectable Synchronous or Free-Run refreshing. Pick the AD4203 for general-purpose 4-20 mA loops; pick the AD4208 for high-resolution or motion-synchronized loops.
How do I wire a 4-20 mA transmitter to the NX-AD4203?
Land the transmitter positive on channel V+ and the transmitter negative on channel I- on the 16-terminal screwless connector. The slice is single-ended, so share the panel-ground return across all eight channels. The NX-AD4203 itself does not supply loop power - provide 24 VDC loop power from a separate PSU or from an NX-PC0020 power connection unit on the NX bus.
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