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6-Channel RTD, Thermocouple & Strain Measurement I/O Module

The IO172 I/O module offers versatile support to measure temperature and strain using ungrounded thermocouples, resistive sensors such as resistance temperature detectors (RTD), thermistors, and strain gauges.

Its 6 channels can be configured individually for any sensor type, and predefined parameter sets are available for the most common sensor types.

The IO172 comes with a dedicated terminal board that allows individual wiring schemes to be implemented for each channel.

The module can perform cold junction compensation, measure cold junction temperatures and can be used for testing workflows in various industries.

For simplified wiring, an optional terminal box with an integrated SE95 thermal sensor for cold junction compensation can be purchased together with the I/O module.

Key Features

Thermocouples Resistance Temperature Detectors (RTD) Strain Gauges
Measure the following thermocouples: B, S, R, T, E, N, J, and K Measure the following detectors: NI1000, NI500, NI100, PT1000, PT500 and PT100 All strain gauge types supported
Cold junction compensation performed inside a dedicated terminal board Measurements are ratiometric and done using an onboard high- precision reference resistor Quarter, half or full bridge circuit configurations may be used. Quarter and half bridges must be completed outside of the I/O module
Thermocouple conversion time of 22 ms RTD conversion time of 22 ms Strain gauge conversion time of 74 ms
Form factor mPCIe
Power requirements 300 mA typical @ VPWR = +3.3 V DC
200 mA typical @ VPWR = +1.5 V DC
Connectors 2x 17-pin M12 connectors
Operating temperature -40°C to +85°C
Relative humidity 5 to 95%, non-condensing
Analog Input  
Number of channels 6 individually-configurable, analog thermo-/strain measurement channels
ADC resolution 24 bit
Conversion time Thermocouples: 22 ms
RTD: 22 ms
Strain gauges: 74 ms
All times are total times from setting the conversion trigger to the time when valid data is ready to be read from the Channel Data Register.
Supported thermocouple types B, S, R, T, E, N, J, and K
Supported resistive sensors (RTDs) NI1000, NI500, NI100, PT1000, PT500, and PT100
Supported strain gauges Quarter, half and full bridge
Analog Output  
Number of outputs 6 differential sensor excitation outputs
Current step size 200 uA
Excitation Source 0 – 2 mA (dependent on sensor type)
The excitation current is set up automatically for RTDs, and strain gauge and thermocouples do not need excitation current
RBIAS Reference Resistor Value 5.6 kΩ (RTD sensors must not exceed this value)
Mean time between failures (MTBF)* 1,020,000 hours
MTBF (Mean Time Between Failure) - MTBF values shown are based on calculation according to MIL-HDBK-217F and MIL-HDBK-217F Notice 2; Environment: GB 20°C. The MTBF calculation is based on component FIT rates provided by the component suppliers. If FIT rates are not available, MIL-HDBK-217F and MIL-HDBK-217F Notice 2 formulas are used for the FIT rate calculation.
Item ID Product Name Components
2A172X* IO172
  • 1x IO172 I/O module
  • 1x 17-pin male M12 to 17-pin female M12 cable, (3 ft/0.91 m)
  • 1x 2-way 17-pin M12 terminal board
  • Driver block library for Simulink Real-Time™
  • Comprehensive documentation and Simulink example models
  • Installation into the real-time target machine
Optional Accessories  
350072 Terminal Box IO172 34-pin terminal box with cold-junction compensation and dedicated output for excitation current

Key to X in Item ID
Please replace the X with the code number of the specific target machine into which this I/O module shall be installed:

  • 7 = Unit real-time target machine
  • 8 = Baseline real-time target machine

Pricing information
We don't publish pricing information on our website. Upon request by e-mail or phone we can provide a complete price list covering our entire product portfolio in various currencies. We recommend that you get in touch with us to discuss your specific needs. We can then quickly provide you with a tailored quotation including technical and pricing information.


Included in delivery

Common Applications

Supported target machines


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