Novus DigiRail-2A

  • Power: 10-35 Vdc
  • Consumption: 50 mA
  • RS485 (2-wire) Modbus RTU communication
  • Sensor break detection for t/c and RTD
  • Analog input resolution: 17 bits
  • User defined linearization option for the analog inputs
  • Accuracy (@ 25 °C): ±0.25% FS ±1°C for thermocouples, ±0.15% FS for Pt100, mV, V and mA
  • Isolation: 1000 Vac/1 min from analog input to power or communications port



The Novus DigiRail-2A Analog Input Module

The DigiRail-2A Analog Input Module signal condition and digital transmitters with Modbus RTU communication interface provide a simple way for integrating analog signal to supervisory systems. Featuring two universal input analog signal channels it is the most economical way to deliver analog input to PLC’s and SCADA systems.

The input signals are isolated from power, protecting the electrical instruments by eliminating ground loop effects. This substantially reduces undesirable interferences and instabilities in sensor measurements.


DigiRail can be easily configured and calibrated via the digital interface by using the Windows-based DigiConfig software via the RS485 interface by using Modbus RTU commands.

The DigiConfig software allows for configuration of all DigiRail features as well as complete calibration and diagnosis. It automatically detects active devices in the Modbus network and permits configuration of all parameters.


  • Analog inputs: programmable for thermocouples (J, K, T, E, N, R, S, B), Pt100, mV, V, mA. Refer to table 1.
  • Cold junction compensation for thermocouples and compensation for Pt100 3-wire cables.
  • Open loop detection for thermocouples, Pt100 and mV.
  • Sampling rate for 1 analog input: 10Hz for mV, V and mA. 5Hz for T thermocouples and Pt100.
  • Analog input resolution: 17 bits.
  • Power: 10 to 35 Vdc, 50mA maximum current.
  • 2-wire RS485 communication with Modbus RTU protocol. Configurable address and baud rate (1,200 to 115,200bps).
  • LED indicators for communication and status. Key for resetting communication parameters to original factory default.
  • Accuracy (at 25°C): Pt100, mV, V and mA: ±0.15% of full scale. Thermocouples: ±0.25% of full scale.
  • Temperature effect: 0.003% of full scale/°
  • Cold junction compensation for thermocouples: ±1°C at 25°C. ±0.05 °C/°C
  • Isolation: 1000 Vac from inputs (analog or digital) and power or communication. Communication and power are not isolated from one another nor are the analog inputs from each other. Every two digital inputs are isolated from other pairs of same inputs.
  • Windows.based configurator software.
  • Dimensions: 72 x 78 x 19mm.
  • Mounting: 35mm DIN rail. Refer to drawing.
  • Working temperature: 0 to 70°C