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Process Voltage Input Modules with Voltage-Output, Bandwidth 100 Hz

SCM7B33 voltage input modules accept input signals in the + 1V to + 5V or 0 to + 5V ranges from the field and provide a high-level output to the process control system. As an alternative, the SCM7B33 can be used with an external 250 Ω resistor (Dataforth SCM7BXR1 or equivalent), to accept input signals in the 4-20 mA or 0-20 mA ranges. Using the external sense resistor allows the module to be removed without disrupting the current loop. All SCM7B33s are shipped with a SCM7BXR1 resistor.

These modules incorporate a five-pole filtering approach to maximize both time and frequency response by taking advantage of both Thomson (Bessel) and Butterworth characteristics. One pole of the filter is on the field side of the isolation barrier; four are on the process control system side.

After the initial field-side filtering (conversion-SCM7B32 only), the input signal is chopped by a proprietary chopper circuit and transferred across the trans-former isolation barrier, suppressing transmission of common mode spikes and surges. The signal is then reconstructed and filtered for process control system output.

Modules accept a wide 14 - 35 VDC power supply range (+ 24VDC nominal). Their compact packages (2.13"x1.705"x0.605" max) save space and are ideal for high channel density applications. They are designed for easy DIN rail mounting using any of the “-DIN” backpanels.

Circuit diagram Dataforth SCM7B33

Block Diagram SCM7B33

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2 Modules for Type SCM7B33:

SCM7B33-02 0 to +5 V SCM7B33 Isolated Process Voltage Input Module with Voltage-Output
SCM7B33-01 +1 to +5 V SCM7B33 Isolated Process Voltage Input Module with Voltage-Output


  • Input: V Signal
  • Output: 1 V … 5 V / 0 V … 5 V / 0 V … 10 V
  • Bandwidth 100 Hz
  • Isolation 1500 Vrms
  • Input protection 120 Vrms
  • Input Resistance 2 MOhm
  • Accuracy ± 0.03% (typ.), ± 0.1% (max.)
  • Linearity ± 0.01% (typ.), ± 0.02% (max.)
  • ANSI/IEEE C37.90.1 Input protection
  • CMR 105dB
  • True 2-way isolation
  • NMR: 80dB / Decade > 100 Hz
  • Power Supply 14 to 35 VDC
  • Operating Temperature Range -40°C … +85°C
  • Mix and Match Types on Backpanels possible
  • Dimensions 54.1 x 43.3 x 15.4 mm
  • Optional DIN Rail Mounting
  • CSA certified, CE and ATEX compliant
  • Wide range of accessories
  • Special Solutions on request