Schneider TM2ALM3LT 2-in-1 Analog Module | 12-Bit Thermocouple Input

TM2ALM3LT – Analog I/O Module (2 Inputs / 1 Output)

Brand: Schneider Electric | Series: Modicon M238 | Type: Analog Input/Output Module

2 thermocouple / temperature inputs + 1 analog output. 12-bit resolution, 24 V DC, screw terminals. For M238 logic controllers.

Key Features

• 2 analog inputs – for thermocouple (J/K/T) or Pt probe
• 1 analog output – 0…10 V or 4…20 mA
• 12-bit resolution – precise measurement
• Fast conversion – 20 ms + cycle time
• Photocoupler isolation – 500 V insulation
• Compact – 23.5 mm width

Technical Specifications

• Inputs
  • Number: 2
  • Type: Low-level analog
  • Supported sensors: Pt 3-wire (100…500 °C), TC J (0…1200 °C), TC K (0…1300 °C), TC T (0…400 °C)
  • Resolution: 12 bits
  • LSB: 0.1 °C (TC) / 0.15 °C (Pt)
  • Input impedance: ≥1 MΩ
  • Sampling: ≤20 ms (Pt) / ≤60 ms (TC)
  • Acquisition: 60…80 ms per channel
• Output
  • Number: 1
  • Type: Current (4…20 mA) or Voltage (0…10 V)
  • Resolution: 12 bits
  • LSB: 4.8 µA (current) / 2.5 mV (voltage)
  • Load: ≤300 Ω (current) / ≥2 kΩ (voltage)
  • Stabilization: 20 ms
• Accuracy & Performance
  • Measurement error: ±0.2% FS (typ.)
  • Repeat accuracy: ±0.5% FS
  • Non-linearity: ±0.2% FS
  • Total error: ±1% FS
  • Temp coefficient: ±0.006% FS/°C (TC/Pt) / ±0.015% FS/°C (I/V)
• Power & Environment
  • Supply: 24 V DC (19.2…30 V)
  • Current: 50 mA (external) + 50 mA (internal)
  • Isolation: 500 V (photocoupler)
  • Temp (operation): -5…60 °C
  • Width: 23.5 mm | Depth: 70 mm | Height: 90 mm
  • Weight: 0.085 kg

Installation & Commissioning

• Mounting: DIN rail, fits M238 controller rack.
• Wiring: One removable screw terminal block.
• Cable: Shielded cable recommended for inputs.
• Configuration: Auto-detected by SoMachine software.

Compatibility & Applications

• Controllers: Modicon M238, Twido, Advantys OTB.
• Loads: Valves, drives, indicators (output).
• Sensors: Thermocouples, Pt100 probes.
• Use cases: Temperature control, process monitoring, HVAC.

Certifications & Standards

• IEC 61131-2, UL, CSA, CE, EAC
• Dielectric strength: 500 V (channel-to-logic, channel-to-supply)

Package & Delivery

• Package: 1 unit, 23.5 x 90 x 70 mm.
• Warranty: 12 months.
• Shipping: FedEx, UPS, DHL – dispatched within 12-24 hours.

Expert Review

“Versatile analog module for M238. The 12-bit resolution gives good precision for temperature control. The combination of TC inputs and analog output saves space and cost.”

Manager’s Insight

“Perfect for small-scale process automation. The 4…20 mA output works with most drives. Use shielded cables to reduce noise – the module is sensitive but accurate.”

Application Scenarios

• Temperature monitoring with thermocouples or Pt100
• Closed-loop control (heater / cooler)
• Analog signal conversion for VFDs
• Data logging and process trending

Comparison with Similar Models

• TM2ALM3LT – 2 TC inputs + 1 analog output.
• TM2ALM4LT – 4 analog inputs (no output).
• TM2AMI2HT – 2 high-level analog inputs.
• TM2AMM3HT – Mixed I/O with different ranges.

FAQ

• What sensors are supported?
  Thermocouples J/K/T and 3-wire Pt100 probes.
• Can I use both inputs with different sensors?
  Yes, each input is independent.
• What is the output range?
  0…10 V or 4…20 mA (selectable).
• Is the module isolated?
  Yes, photocoupler isolation – 500 V.
• How long is the conversion time?
  20 ms + one controller cycle.
• Can I connect a 2-wire Pt100?
  No, only 3-wire probes are supported.
• What software is needed?
  SoMachine or TwidoSuite.
• How to choose between TM2ALM3LT and TM2ALM4LT?
  Choose 3LT if you need an output; choose 4LT if you only need inputs.

Selection Guide

• Need temperature + control output: TM2ALM3LT.
• Only temperature inputs: TM2ALM4LT.
• High-level signals (0…10V / 4…20mA): TM2AMI2HT.
• Mixed analog I/O: TM2AMM3HT.

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