Part of the Omron NX-Series Safety & I/O series — see the full model table, lifecycle status and replacement parts.
Omron NX-AD2208 — NX 2-Ch 4-20 mA Input, 1/30000
SKU: NX-AD2208USD 378.00
Omron NX-AD2208 NX-series 2-channel differential 4-20 mA analog input, 1/30000 resolution, 10 us/point. In stock, China shipping.
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Product Overview
The Omron NX-AD2208 is a 2-channel differential 4-20 mA analog input unit for the NX-series I/O platform, manufactured by Omron Corporation. Hengyixin Automation stocks this controller option board 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 reads two 4 to 20 mA loops at 1/30000 full-scale resolution and 10 us per point. Accuracy is 25 C plus or minus 0.1 percent of full scale, 0 to 55 C plus or minus 0.2 percent. The screwless 8-position push-in terminal block (NX-TBA082) accepts two 4-20 mA loops without tools. Wire-break detection is built in for the 4-20 mA range.
Refresh mode is selectable per project: synchronous with the EtherCAT cycle, or Free-Run for stand-alone EtherNet/IP drops. The unit draws 1.25 W max from the NX bus and mounts on any NX-series coupler, including the NX-ECC202 for EtherCAT or the NX-EIC202 for EtherNet/IP. The matching 4-20 mA output is the NX-DA2205. The lower-cost 1/8000 single-ended sibling is the NX-AD2203.
Key Features
- NX-series 2-channel differential 4-20 mA analog input, 1/30000 full-scale resolution, 10 us/point conversion time
- Selectable synchronous I/O refreshing (matched to the EtherCAT cycle) or Free-Run refreshing for EtherNet/IP drops
- Wire-break detection on the 4-20 mA range, overall accuracy +/-0.1 percent at 25 C, +/-0.2 percent at 0 to 55 C
- Screwless 8-position push-in terminal block (NX-TBA082), 12 mm wide housing, 90 g, IP20
- SKU: NX-AD2208
- Series: Omron NX-series I/O platform (NX-AD analog input family)
- I/O: 2 I/O
Best-Fit Applications
- Load-cell conditioning on a packaging line where two 4-20 mA strain-gauge bridges feed the NX-AD2208 over differential pairs and the EtherCAT cycle timestamps each scan
- Flow-meter monitoring in a brewery where two magnetic flow transmitters land on one NX-AD2208 next to an NX-DA2205 that drives the control valve
- Spare replacement on a mixing tank where the previous NX-AD2204 (1/8000) is swapped for the 1/30000 NX-AD2208 to read low-velocity dosing pumps more accurately
Buying Checklist
- Pick the NX-AD2208 for a 2-channel NX-series 4-20 mA differential input at 1/30000 resolution and 10 us/point conversion.
- Pick the NX-AD2204 instead when the cabinet only needs 1/8000 resolution at 250 us/point and Free-Run refreshing is enough.
- Pick the NX-AD2203 instead when the loops share a common ground and single-ended wiring is acceptable on the same 12 mm wide housing.
Technical Specifications
| Manufacturer | Omron Corporation (Japan) |
|---|---|
| Series | Omron NX-series I/O platform (NX-AD analog input family) |
| Model / SKU | NX-AD2208 |
| Number of Points | 2 analog inputs, differential input method, screwless push-in terminal block (8 terminals) |
| Input Range | 4 to 20 mA (input conversion range -5 to 105 percent of full scale, absolute maximum +/-30 mA) |
| Resolution | 1/30000 of full scale (15-bit effective), 250 ohm input impedance |
| Conversion Time | 10 us per point, selectable synchronous I/O refreshing or Free-Run refreshing |
| Overall Accuracy | +/-0.1 percent of full scale at 25 C, +/-0.2 percent of full scale at 0 to 55 C |
| Wire-Break Detection | Built-in on the 4-20 mA range; flag below 2 mA |
| Isolation | Between input and NX bus: power = transformer, signal = digital isolator; no isolation between the two input channels |
| Power Consumption | 1.25 W max from NX bus when connected to a CPU or Communication Control Unit, 0.90 W max via a Communications Coupler Unit |
| Dimensions / Weight | 12 (W) x 100 (H) x 71 (D) mm, 90 g, IP20, 0 to 55 C operating, cULus / CE / KC / RCM listed |
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-AD2208
What is the Omron NX-AD2208 used for?
It is the NX-series 2-channel differential 4-20 mA analog input unit. It mounts on an NX-series coupler (NX-ECC202 for EtherCAT, NX-EIC202 for EtherNet/IP) and reads two 4-20 mA loops at 1/30000 full-scale resolution and 10 us per point. Typical uses are strain-gauge / load-cell conditioning, flow and pressure transmitters, and any high-speed 4-20 mA loop where differential wiring is needed to reject common-mode noise.
NX-AD2208 vs NX-AD2204 - what is the difference?
Both share the same 2-channel 4-20 mA differential body, 12 mm wide housing, and screwless push-in terminal block. The -2208 is the 1/30000 resolution, 10 us/point, synchronous-or-Free-Run variant. The -2204 is the 1/8000 resolution, 250 us/point, Free-Run-only variant. Pick the -2208 when the loop needs 15-bit effective resolution or must move in step with the EtherCAT cycle; pick the -2204 for general-purpose 4-20 mA monitoring.
Does the NX-AD2208 support synchronous I/O refreshing?
Yes. The NX-AD2208 supports both synchronous I/O refreshing (matched to the EtherCAT cycle of the host NJ / NX CPU) and Free-Run refreshing (for stand-alone EtherNet/IP drops). Set the refreshing mode in the Sysmac Studio I/O Map for the unit. Synchronous is the typical choice when the analog sample must align with the servo cycle.
What NX coupler works with the NX-AD2208?
Any of the NX-series communication couplers. For EtherCAT, use the NX-ECC202 (standard) or NX-ECC203 (high-speed, lower cycle). For EtherNet/IP, use the NX-EIC202. The NX-AD2208 is compatible with Sysmac Studio 1.05 or later; older Sysmac Studio versions may need a unit-version update.
Does the NX-AD2208 need a separate 24 VDC supply?
No. The NX-AD2208 has no I/O power supply terminals and draws all operating power from the NX bus. The 4-20 mA loops must be powered from an external 24 VDC transmitter supply (typical 2-wire loop) or from a 4-wire active transmitter. Power consumption is 1.25 W max when connected to a CPU and 0.90 W max when connected via a coupler.
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