What is the key difference between modules TM3TI4 and TM3TI4D

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The key difference is that Module TM3TI4D offers four (4) Temperature inputs for the usage of Thermocouples only (Types: K, J, R, S, B, E, T, N, C).
This module is similar to the TM3TI4 module, except that it is exclusive to thermocouple usage only; the difference is that it has differential channels to measure temperatures with better channel isolation.
Therefore, non-isolated thermocouples can be used. The module has 2 separate references: one with screw terminals (TM3TI4D) and one with spring terminals (TM3TI4DG).

Technical characteristics of TM3TI4 module:

TM3TI4 (screw) and TM3TI4G (spring) analog expansion modules:

4 channels 16 bits (Voltage, current, isolated thermocouple, 3-wire-RTD)

Removable screw or spring terminal block

Signal type	Voltage	Current	Thermocouple	3-wire-RTD
Input range	0…10 Vdc –10…+10 Vdc	0…20 mA 4…20 mA	Type K, J, R, S, B, E, T, N, C	PT100, PT1000, NI100, NI1000
Resolution max	16 bits, or 15 bits + sign (65536 points)

Technical characteristics of TM3TI4D module:

TM3TI4D (screw) and TM3TI4DG (spring) analog expansion modules:

4 channels 16 bits, electrically isolated or non-isolated thermocouple
Removable screw or spring terminal block

Signal type	Electrically isolated or non-isolated thermocouple
Input range	Type K, J, R, S, B, E, T, N, C
Resolution max	16 bits, or 15 bits + sign (65536 points)