Part of the Omron NX-Series Safety & I/O series — see the full model table, lifecycle status and replacement parts.
Omron NX-RS1201 — NX Load Cell Input, 24-bit
SKU: NX-RS1201USD 195.00
Omron NX-RS1201 NX-series load cell input unit, -5 to +5 mV/V, 24-bit, 125 us. In stock, China shipping.
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Product Overview
The Omron NX-RS1201 is the NX-series 1-channel load cell input unit, 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.
It reads a single load cell at -5.0 to +5.0 mV/V into a 24-bit A/D at 125 us conversion. The unit supplies 5 VDC excitation at 60 mA to power the load cell. Both 4-wire and 6-wire load-cell connections are supported. Accuracy is +/- 0.01 percent F.S. nonlinearity and +/- 0.1 uV/degree C zero drift.
NX Unit power is 2.05 W max on a CPU Unit or Communication Control Unit, 1.70 W max on a Communications Coupler Unit. No I/O power supply is consumed. Isolation is transformer (power) and digital isolator (signal) between input and NX bus. The 12 x 100 x 71 mm housing weighs 70 g. The unit supports Free-Run, synchronous or task period prioritized I/O refresh. For RTD or thermocouple input pick the NX-TS3101 or NX-TS3201.
Key Features
- NX-series 1-channel load cell input unit, -5.0 to 5.0 mV/V, 24-bit A/D, 125 us conversion cycle
- 5 VDC +/- 10 percent load cell excitation at 60 mA max, supports 4-wire and 6-wire load-cell wiring
- Nonlinearity +/- 0.01 percent F.S., zero drift +/- 0.1 uV/degree C RTI, gain drift +/- 10 ppm/degree C
- Transformer and digital isolator between input and NX bus, 12 mm wide, 70 g, IP20, no I/O power consumed
- SKU: NX-RS1201
- Series: NX-series machine automation I/O, load cell input family (NX-RS)
Best-Fit Applications
- Tank weighing on a batching skid where the NX-RS1201 reads one load cell at 125 us and the NJ501 closes the fill valve at weight
- Force measurement on a press-fit station where the NX-RS1201 captures peak force per cycle for SPC trending
- Spare replacement on an NX-ECC201 rack where the original load-cell slice was damaged and needs re-insertion on the same slot
Buying Checklist
- Pick the NX-RS1201 when a single load cell needs to be read into the NX bus at 24-bit resolution and 125 us conversion.
- Pick the NX-TS3101 instead when the panel needs 4 thermocouple inputs at 0.1 C for thermal profiling rather than load-cell weighing.
- Pick the NX-TS3201 instead when the panel needs 4 Pt100/Pt1000 RTD inputs rather than load-cell weighing.
Technical Specifications
| Manufacturer | Omron Corporation (Japan) |
|---|---|
| Series | NX-series machine automation I/O, load cell input family (NX-RS) |
| Model / SKU | NX-RS1201 |
| Number of Channels | 1 load cell input, differential |
| Input Range | -5.0 to 5.0 mV/V; input conversion range -5.5 to 5.5 mV/V; zero/gain adjustment -5.0 to 5.0 mV/V |
| Excitation | 5 VDC +/- 10 percent, output current 60 mA max |
| Resolution / Accuracy | 24-bit A/D; 125 us conversion; nonlinearity +/- 0.01 percent F.S.; zero drift +/- 0.1 uV/degree C RTI; gain drift +/- 10 ppm/degree C |
| I/O Refresh | Free-Run refreshing, synchronous I/O refreshing, or task period prioritized refreshing |
| Power | NX Unit power 2.05 W max on CPU, 1.70 W max on Communications Coupler Unit; no I/O power supply consumed |
| Isolation | Transformer (power) and digital isolator (signal) between input and NX bus; insulation 20 MOhm min at 100 VDC; dielectric 510 VAC for 1 minute at 5 mA max |
| Warm-up / Wiring | Warm-up 30 minutes; screwless clamping terminal block, 16 terminals; 6-wire and 4-wire load-cell wiring diagrams in user manual W565 |
| Environment / Wiring | 0 to 55 C operating, 10 to 95 percent humidity; 12 (W) x 100 (H) x 71 (D) mm; 70 g; DIN 35 mm rail mount; IP20; KC, RCM, NK, EN 61131-2, cULus, ANSI/ISA 12.12.01 approvals |
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-RS1201
What is the Omron NX-RS1201 used for?
It is the NX-series 1-channel load cell input unit. It reads a single load cell at -5.0 to 5.0 mV/V into a 24-bit A/D at 125 us conversion. Typical uses are tank weighing on batching skids, force measurement on press-fit stations, and spare replacement on a damaged NX-ECC201 rack slice.
Does the NX-RS1201 work with 4-wire and 6-wire load cells?
Yes. The NX-RS1201 supports both 4-wire and 6-wire load-cell wiring diagrams in the NX-series Load Cell Input Unit User's Manual (W565). 6-wire is preferred for long cable runs because it adds sense lines that compensate for cable resistance. The screwless 16-terminal block carries excitation plus, excitation minus, sense plus, sense minus, signal plus and signal minus.
What is the resolution of the NX-RS1201?
24-bit A/D converter. Conversion cycle is 125 us per Unit. Accuracy is specified as +/- 0.01 percent F.S. nonlinearity, +/- 0.1 uV/degree C RTI zero drift and +/- 10 ppm/degree C gain drift. Warm-up period is 30 minutes before the rated accuracy applies.
NX-RS1201 vs NX-TS3101 - what is the difference?
The NX-RS1201 is a 1-channel load cell input unit (-5 to 5 mV/V, 24-bit, 125 us). The NX-TS3101 is a 4-channel thermocouple temperature input unit (0.1 C resolution, 250 ms per Unit). Pick the NX-RS1201 for force or weight measurements from a load cell. Pick the NX-TS3101 when the panel needs 4 thermocouple inputs for thermal profiling.
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