Part of the Omron NX-Series Safety & I/O series — see the full model table, lifecycle status and replacement parts.
Omron NX-AD3208 — 4-Ch Analog Input, 4-20 mA, 1/30000
SKU: NX-AD3208USD 442.00
Omron NX-AD3208 NX-series 4-ch analog current input, 4-20 mA differential, 1/30000, 10 us. In stock, China shipping.
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Product Overview
The Omron NX-AD3208 is the NX-series 4-ch high-resolution current analog input unit, 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 4 differential current signals at 4 to 20 mA. Resolution 1/30000 full scale and 10 microseconds per point conversion time make it the right slice for high-speed process loops and synchronized motion feedback.
Selectable Synchronous or Free-Run refreshing in Sysmac Studio. Input impedance 250 Ohm, absolute maximum +/-30 mA, accuracy 0.1 percent at 25 C and 0.2 percent at 0 to 55 C. Transformer and digital isolator between input and NX bus; no isolation between inputs. 12 mm wide, 70 g, IP20. The lower-resolution sibling is NX-AD3204 (1/8000). The voltage-input sibling is NX-AD3608. The 8-ch current sibling is NX-AD4208.
Key Features
- NX-series 4-channel analog input unit, current type, 4 to 20 mA, differential input, input impedance 250 Ohm
- Resolution 1/30000 full scale; conversion time 10 microseconds per point; accuracy 0.1 percent at 25 C and 0.2 percent at 0 to 55 C
- Selectable Synchronous I/O refreshing or Free-Run refreshing in Sysmac Studio; input disconnection detection supported
- Screwless push-in 12-terminal connector, NX bus-powered, 12 (W) x 100 (H) x 71 (D) mm, 70 g, IP20
- SKU: NX-AD3208
- Series: NX-series Analog I/O Unit (NX-AD family) on NX I/O Bus
- I/O: 4 I/O
Best-Fit Applications
- High-speed press force monitoring where four strain-gauge amplifiers feed 4-20 mA signals sampled at 10 us per point into the NX1P2-1040DT
- Hydraulic cylinder position loop where four 4-20 mA pressure transducers feed the NX102-1200 motion controller at the EtherCAT cycle
- Spare replacement on a process skid where the original NX-AD3208 was lost and Sysmac Studio holds the I/O map and channel scaling
Buying Checklist
- Pick the NX-AD3208 when the cell needs 4 differential 4-20 mA inputs with 1/30000 resolution and 10 us conversion.
- Pick the NX-AD3204 instead when 4 differential 4-20 mA inputs at 1/8000 resolution and 250 us conversion are enough.
- Pick the NX-AD3608 instead when the field devices are -10 to +10 V voltage signals instead of 4-20 mA current loops.
Technical Specifications
| Manufacturer | Omron Corporation (Japan) |
|---|---|
| Series | NX-series Analog I/O Unit (NX-AD family) on NX I/O Bus |
| Model / SKU | NX-AD3208 |
| Number of Points | 4 differential analog inputs |
| Input Range | 4 to 20 mA (input conversion range -5 to 105 percent of full scale) |
| Resolution / Conversion | 1/30000 (full scale); 10 microseconds per point; synchronous I/O refreshing selectable |
| Accuracy | 25 C +/-0.1 percent full scale; 0 to 55 C +/-0.2 percent full scale |
| Input Impedance / Max | 250 Ohm; absolute maximum +/-30 mA |
| Refreshing | Selectable Synchronous I/O refreshing or Free-Run refreshing |
| Isolation | Transformer (power) + digital isolator (signal) between input and NX bus; no isolation between inputs; dielectric 510 VAC for 1 minute |
| Connection / Power | Screwless push-in 12-terminal connector; NX unit power 1.30 W max on CPU / 0.95 W max on Coupler |
| 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 |
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-AD3208
What is the Omron NX-AD3208 used for?
It is the NX-series 4-channel analog current input unit for 4 to 20 mA differential signals. Typical uses are high-speed press force monitoring, hydraulic cylinder position loops, and spare replacement on a process skid where Sysmac Studio holds the I/O map.
NX-AD3208 vs NX-AD3204 - what is the difference?
Both are NX-series 4-channel analog current input units at 4 to 20 mA differential. The AD3208 has 1/30000 resolution and 10 microsecond conversion with selectable Synchronous or Free-Run refreshing. The AD3204 has 1/8000 resolution and 250 microsecond conversion with Free-Run refreshing only. Pick the AD3208 for high-speed or high-resolution loops; pick the AD3204 for general-purpose current inputs.
Does the NX-AD3208 detect input disconnection?
Yes. The NX-AD3208 supports input disconnection detection per channel; the NX-AD3204 (1/8000, 250 us) does not. Use this feature to flag a broken transmitter wire before the loop goes below 4 mA and reads zero.
How is the NX-AD3208 wired to a 4-20 mA transmitter?
Connect the transmitter positive lead to the channel V+ terminal and the transmitter negative lead to the channel I- terminal on the screwless push-in 12-terminal connector. Provide 24 VDC loop power from a separate PSU or from the NX-PC0020 IOV power connection unit on the NX bus. No shield terminal on the slice; ground the cable shield at the panel ground bar.
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