The Omron NX-TS3101 serves as the primary NX-TS3101 Temperature Input Unit utilized to execute multi-channel thermocouple signal acquisition across NX I/O Bus platforms. Operating with a conversion time of 250 ms per unit via Free-Run refreshing, it accepts up to 4 direct thermocouple sensor inputs including types K, J, T, E, L, U, N, R, S, B, WRe5-26, and PLII. The unit provides signal insulation using internal transformers and photocouplers, maintaining measurement precision down to 0.1 deg C max resolution without drawing I/O loop power.

Part Number Code Structure

• NX: Omron modular I/O system series identifier.
• TS: Temperature Input Unit functional specification.
• 3: 4-point channel density rating.
• 1: Thermocouple input sensor interface category.
• 01: 250 ms/unit conversion timing option.

Technical Performance Metrics

Backplane Synchronization & Network Connectivity

The module interfaces directly with EtherCAT and Profinet / EtherNet/IP deterministic networks via the NX backplane bus coupler. Optimized backplane bus communication velocity enables consistent data exchange across high-density panel configurations. Dual photocoupler signal isolation and transformer power isolation prevent cross-channel electrical interference and protect central processing logic. Integrated firmware flash compatibility supports seamless field updates and automatic parameter verification during bus initialization.

Shipment Box Contents

• 1 x Omron NX-TS3101 Temperature Input Module
• 2 x 16-Pin Screwless Clamping Terminal Blocks
• 1 x Technical Installation Guide

Field Mounting & Terminal Setup

• DIN Rail Engagement: Align the rear locking bracket onto a standard 35 mm DIN rail and push firmly until the mounting latch clicks into place.
• Wire Insertion: Strip conductors or ferrules to 10 mm. Push the wire directly into the screwless clamping terminal hole without using tools.
• Wire Removal: Press down the release tool slot using a flat-head screwdriver while pulling the field wire straight out.
• Thermocouple Compensation: Connect compensating leads matching the specific thermocouple type directly to terminal points to avoid CJC errors.
• Warm-Up Standard: Keep the unit powered for a 30-minute warm-up period to reach full thermal stability and compensation accuracy.

Technical Questions & Answers

• What is the procedure for replacing an active NX-TS3101 module?

  Hot-swapping is not supported on the NX bus. Power off all CPU, coupler, and I/O bus supplies before removing or replacing the unit.

• How does the unit handle a disconnected or broken thermocouple cable?

  An open-circuit detection current of approx 0.1 uA flows continuously. If a break occurs, the module sets disconnection status flags for the CPU.

• Does the NX-TS3101 require an external 24 VDC auxiliary supply?

  No auxiliary power wiring is needed. Internal logic and measurement circuits run entirely on power supplied from the backplane NX bus.

• What causes the resolution to shift from 0.1 deg C to 0.2 deg C?

  Thermocouple types R, S, and W feature non-linear thermoelectric outputs at lower millivolt levels, limiting resolution to 0.2 deg C max.

• What is the function of Free-Run refreshing on this module?

  Free-Run refreshing updates internal input data asynchronously to the backplane communication cycle, refreshing values every 250 ms.

• What isolation voltage does the internal transformer and photocoupler offer?

  The isolated circuits withstand 510 VAC for 1 minute at 5 mA max leakage current, with insulation resistance exceeding 20 Mohm at 100 VDC.

• What signal range limit applies to raw voltage inputs?

  The hardware input rating is capped at an absolute maximum of +/-130 mV. Voltage levels beyond this threshold risk permanent hardware damage.

• Can channels be configured independently for different sensor types?

  Yes. Each of the 4 channels can be individually programmed for different thermocouple types via Sysmac Studio software settings.