Part of the Omron NX-Series Safety & I/O series — see the full model table, lifecycle status and replacement parts.
Omron NX-AD3603 — 4 Ch ±10 V Analog Input, NX Series
SKU: NX-AD3603USD 150.00
4-channel analog input module for NX-series PLC and EtherCAT coupler, -10 to +10 V single-ended voltage, 1/8000 resolution
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Product Overview
The Omron NX-AD3603 is a 4-channel voltage analog input unit for the NX-series I/O system. 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 plugs onto the right side of an NX102, NX1P2, or NJ501 CPU, or onto an NX-EIC202 / NX-ECC202 EtherCAT coupler, and exposes four -10 to +10 V single-ended inputs with 1/8000 (13-bit) resolution. It is the right pick when you need to read bipolar analog signals — a servo drive velocity command, a hydraulic valve positioner, a load-cell amplifier with a ±5 V output, or any sensor that swings both above and below zero — into the NX rack without adding external signal conditioning.
Absolute maximum input voltage is ±15 V — exceed this and you will damage the front end.
Key Features
- Input impedance 1 MΩ min, absolute maximum ±15 V
- 4 analog input channels, -10 to +10 V single-ended voltage
- 250 µs/point conversion time, full 4-channel scan in ~1 ms
- Free-Run I/O refresh, aligns naturally with 1–2 ms NX task periods
- SKU: NX-AD3603
- Series: NX (Analog I/O)
Best-Fit Applications
- Reading ±10 V servo drive velocity commands into an NX102 to log follower behaviour
- Monitoring load-cell amplifier output on a batching scale with ±5 V bipolar signal
- Reading analog reference signals on a lab test rig where multiple sensors share a common 0 V
Buying Checklist
- Pick NX-AD3203 when the field device is a current-loop sensor
- Pick NX-AD3603 for 4-point ±10 V single-ended; pick NX-AD3604 for differential, 1/30000 resolution, synchronous refresh
- Pick NX-AD2603 when you only need 2 channels and want to save the panel width
Technical Specifications
| Model | NX-AD3603 |
|---|---|
| Series | NX (Analog I/O) |
| Type | Analog Input Unit |
| Channels | 4 |
| Input Type | Voltage, single-ended |
| Input Range | -10 to +10 V |
| Input Conversion Range | -5 to 105 % of full scale |
| Absolute Max Rating | ±15 V |
| Input Impedance | 1 MΩ minimum |
| Resolution | 1/8000 (13-bit) |
| Terminal Type | Screwless push-in, 12 terminals, detachable (NX-TBA122) |
| Wire Range | 0.14 to 1.5 mm² (26–16 AWG) with ferrules |
| Dimensions (W x H x D) | 12 × 100 × 71 mm |
| Operating Temperature | 0 to +55 °C |
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-AD3603
What is the difference between NX-AD3603 and NX-AD3604?
NX-AD3603 is single-ended, 1/8000 resolution, 250 µs/point conversion, Free-Run refresh only. NX-AD3604 is differential, 1/30000 resolution, 10 µs/point conversion, supports selectable Synchronous I/O refresh. Single-ended is adequate for sensors that share a common 0 V near the panel; differential is required when sources are far apart, grounded at different potentials, or you need 1/30000 precision.
Is the NX-AD3603 isolated between input channels?
No. The four inputs share a common 0 V (terminals B1–B4 are linked internally on the single-ended module), and there is no channel-to-channel isolation. There is isolation between the input section and the NX bus (the digital side), but the four analog channels themselves are not isolated from each other. For per-channel isolation you would need external signal isolators or a different module.
What is the conversion time of the NX-AD3603?
250 µs per point, so approximately 1 ms to scan all four channels. This is well within the typical 1–2 ms EtherCAT task period of an NX102 or NJ501 controller. Free-Run refresh means the module samples independently and the most recent value is what the controller reads; if you need the sample aligned to the EtherCAT cycle (deterministic timing), use the differential NX-AD3604 instead.
Can the NX-AD3603 accept 4–20 mA current inputs?
No — the NX-AD3603 is voltage input only (-10 to +10 V). For 4–20 mA current inputs in the same 4-channel single-ended tier, pick the NX-AD3203. If your field device is 4–20 mA but you have no NX-AD3203 in stock, you can convert the current to voltage with an external 250 Ω precision resistor across the input terminals, but this is a workaround that adds components and reduces accuracy.
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