Omron NX-RS1201 NX Series 1‑Channel Load Cell Input Unit 24‑bit 125µs

Omron NX-RS1201 is a 1‑channel load cell input unit for the NX series I/O system. Converts analog signals from strain‑gauge load cells into digital weight/force values. Input range –5.0 to 5.0 mV/V, 24‑bit A/D converter, 125 µs conversion cycle. Supports 4‑wire and 6‑wire load cell connections. Free‑run, synchronous or task‑period‑prioritized I/O refreshing. Screwless push‑in terminal block, 12 mm width.

Applications:

• Industrial weighing and filling systems

• Process control and batch weighing

• Packaging machinery and checkweighers

• Material handling and force measurement

Core Specifications:

• Product type: Load cell input unit

• Number of channels: 1

• Input range: –5.0 to 5.0 mV/V

• Input conversion range: –5.5 to 5.5 mV/V

• Load cell excitation voltage: 5 V DC ±10%

• Max. excitation current: 60 mA

• A/D converter resolution: 24 bits

• Conversion cycle: 125 µs

• Nonlinearity: ±0.01% of full scale

• Zero drift: ±0.1 μV/°C RTI

• Gain drift: ±10 ppm/°C

• Warm‑up time: 30 minutes

Advanced Specifications:

• Zero point adjustment range: –5.0 to 5.0 mV/V

• Gain point adjustment range: –5.0 to 5.0 mV/V

• Isolation: Transformer + digital isolator between input and NX bus

• Dielectric strength: 510 V AC for 1 min (leakage current ≤ 5 mA)

• Insulation resistance: ≥ 20 MΩ at 100 V DC

• I/O refreshing methods: Free‑run, synchronous, task period prioritized

• Terminal block: Screwless push‑in (16 terminals, removable)

• NX unit power consumption: 1.70 W max.

• Mounting: DIN rail

• Protection rating: IP20

• Dimensions (W × H × D): 12 mm × 100 mm × 71 mm

• Weight: 70 g max.

• Ambient operating temperature: 0 °C … 55 °C

• Ambient operating humidity: 10% … 95% (non‑condensing)

Functions & Features:

• Digital filtering (low‑pass filter, moving average) for stable measurement

• Cable disconnection check via sensor disconnection test

• Digital tare subtraction (fixed tare, one‑touch tare)

• Zero calibration and span calibration procedures

• Data tracing for optimum digital filter design

System Integration:

• This unit belongs to the Omron NX series I/O system.

• Compatible with 4‑wire and 6‑wire strain‑gauge load cells (refer to applicable load cells in the user’s manual).

• Requires an NX series communication coupler unit (EtherCAT or EtherNet/IP) or an NX series CPU unit for operation.

• Configurable in Sysmac Studio via I/O allocation and calibration tools.

• Terminal block spare part: NX‑TBC162.

Related Products:

• NX‑ECC203 – EtherCAT Coupler Unit for NX I/O system (2 ports, 125 μs cycle time)

• NX‑EIC202 – EtherNet/IP Coupler Unit for NX I/O system (2 ports, 63 I/O units)

• NX‑PD1000 – Additional NX unit power supply (24 V DC, 10 W)

• NX‑PF0630 – Additional I/O power supply unit (4 A, 5‑24 V DC)

• NX‑TBC162 – Replacement terminal block (16‑pin, screwless push‑in)