Schneider TM3TI8T Modicon TM3 Analog Input Module 8 Temperature Inputs

Schneider Electric Modicon TM3TI8T is an analog input module with 8 configurable channels for thermocouple, thermistor (NTC/PTC), and resistance (ohmmeter) sensors. Provides 16‑bit resolution for precision temperature measurement. Screw terminal block for permanent field wiring. Part of the TM3 I/O expansion family for Modicon M221, M241, M251, and M262 controllers.

Applications:

• Thermocouple temperature monitoring (types K, J, R, S, B, E, T, N, C)

• NTC/PTC thermistor temperature sensing

• Resistance measurement (ohmmeter mode)

• Multi‑zone furnace and process temperature control

Core Specifications:

• Number of inputs: 8 analog inputs

• Supported sensor types: Thermocouple (K, J, R, S, B, E, T, N, C), NTC thermistor, PTC thermistor, ohmmeter (100 Ω…32 kΩ)

• Resolution: 16 bits (15 bits + sign)

• LSB value: 0.1 °C (thermocouple, NTC probe), 1 Ω (PTC/NTC probe)

• Input impedance: ≥ 1 MΩ (all signal types)

• Conversion time: 100 ms + 100 ms per channel + 1 controller cycle time

• Sampling duration: 100 ms per enabled channel

• Isolation: 1500 V AC between external power supply and inputs, 500 V AC between inputs and internal logic circuits

• Connection: Removable screw terminal block (3.81 mm pitch)

• Supply voltage: 24 V DC (range 20.4…28.8 V)

• Current consumption: 30 mA at 24 V DC (external supply), 30 mA at 5 V DC (bus connector, no load/full load)

• Protection rating: IP20

• Dimensions (W × H × D): approx. 31.3 × 90 × 70 mm

• Weight: approx. 0.11 kg (110 g)

• Operating temperature: -10…55 °C

Advanced Specifications:

• Thermocouple measurement ranges: K (−200…1300 °C), J (−200…1000 °C), R (0…1760 °C), S (0…1760 °C), B (0…1820 °C), E (−200…800 °C), T (−200…400 °C), N (−200…1300 °C), C (0…2315 °C)

• NTC range: 100 Ω…200 kΩ (calculated temperature −90…150 °C)

• PTC range: 100 Ω…10 kΩ

• Ohmmeter range: 100 Ω…32 kΩ

• Accuracy at 25 °C: ±0.2% of full scale (typical), ±6 °C for R/S (0…200 °C), ±0.4% of full scale below 0 °C for K/J/E/T/N

• Temperature drift: ±0.01% of full scale per °C

• Repeatability: ±0.5% of full scale

• Nonlinearity: ±0.2% of full scale

• Cross talk: ≤ 1 LSB

• Input filter: software configurable (0…10 s, per 0.01 s unit)

• Sampling period per channel: configurable (100 ms default)

• Cable type: twisted shielded pair, max 30 m

• Local signalling: 1 × green LED (PWR)

• Connector insertion/removal durability: 100 times minimum

System Integration:

• Belongs to Modicon TM3 series. TM3 expansion modules connect via the TM3 bus.

• Compatible with Modicon M221, M241, M251, M262 controllers.

• Configured in EcoStruxure Machine Expert (formerly SoMachine).

Related Products (upgrade path):

• Lower channel count → TM3TI4 (4 temperature inputs)

• Current model → TM3TI8T (8 temperature inputs, screw terminal)

• Alternative terminal type → TM3TI8TG (8 temperature inputs, spring terminal)

• Complementary analog input → TM3AI4 (4 analog inputs, voltage/current)