OMRON NX-TS3102 Temperature Input Unit

The OMRON NX-TS3102 is a versatile temperature input unit designed for the NX series I/O system. It provides two isolated input channels, each configurable for thermocouple (K, J, T, E, R, S, B, N) or RTD (PT100, PT1000, Ni, etc.) sensors, enabling precise temperature measurement in industrial processes. The unit offers high accuracy (up to ±0.1% of full scale) and includes advanced diagnostic functions such as sensor wire‑break detection, range checking, and burn‑out detection.

The NX-TS3102 features a compact design, fitting into the NX rack with simple snap‑in mounting. It communicates with the CPU via EtherCAT, providing fast, deterministic data exchange. The unit includes LED status indicators for power and channel errors. Its wide input range and configurability make it suitable for applications such as plastics extrusion, food processing, HVAC, and machine monitoring.

Technical Specifications

• Number of channels: 2 (isolated)

• Input types: Thermocouple (types K, J, T, E, R, S, B, N), RTD (PT100, PT1000, Ni100, Cu10)

• Resolution: 0.1°C (thermocouple), 0.01°C (RTD)

• Accuracy: ±0.1% of measured value + 0.5°C (thermocouple), ±0.05% of measured value + 0.1°C (RTD)

• Input impedance: ≥ 1 MΩ (thermocouple), ≤ 500 Ω (RTD)

• Sampling cycle: 50 ms (per channel, configurable)

• Diagnostics: Wire‑break (open/short), over/under range, cold junction compensation (for thermocouple)

• Filter: Digital moving average (configurable up to 128 samples)

• Power supply: 24 V DC (from NX bus)

• Dimensions: 12 x 100 x 85 mm (W x H x D)

• Operating temperature: 0°C to +55°C

• Certifications: CE, UL, RoHS

Functional Capabilities

• Cold junction compensation (CJC): Internal CJC sensor ensures accurate thermocouple readings without external reference, with compensation error < 0.5°C.

• Scaled output: The unit can directly output temperature values in °C, °F, or Kelvin, reducing PLC computation.

• Alarm function: Each channel can be configured with high/low limit alarms, triggering local outputs or bus notifications.

• Open sensor detection: The unit detects broken thermocouple or RTD lines and sets a diagnostic flag.

Typical Applications

• Injection molding: Monitoring barrel and nozzle temperatures for consistent melt quality.

• Food processing: Oven and sterilisation temperature monitoring.

• HVAC: Air and water temperature sensing for building automation.

• Environmental chambers: Temperature profiling and control.

Integration and Configuration

The NX-TS3102 is mounted on the NX bus and automatically recognised by the EtherCAT master (e.g., NJ/NX CPU). Configuration is performed in Sysmac Studio: select the sensor type, set the measurement range, configure filter and alarm parameters. The unit’s process data (temperature values and status) are mapped to the PLC’s memory. The built‑in diagnostics can be monitored via the Sysmac Studio’s device view.

Installation and Wiring

Snap the unit onto the NX rail. Connect the thermocouple or RTD wires to the spring‑clamp terminals (compensating cable for thermocouples, shielded twisted pair for RTDs). For thermocouples, observe polarity. The unit provides a dedicated CJC terminal for wiring compensation. Ensure the shield is grounded at one end to avoid ground loops. The unit can be powered from the NX bus; no external power is needed.

Compliance

The NX-TS3102 meets EN 61000‑6‑2 and EN 61000‑6‑4, carries CE and UL marks, and is RoHS compliant.

Conclusion

The OMRON NX-TS3102 temperature input unit offers high accuracy, flexible sensor support, and robust diagnostics, making it an excellent choice for temperature monitoring in NX‑based automation systems.