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Voltage Input Modules with Voltage-Output, Bandwidth 300 Hz

Each SCM7B21 voltage input module accepts one channel of analog voltage input which is filtered, isolated, amplified, and converted to a high-level analog voltage for output to the process control system.

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, the input signal is chopped by a proprietary chopper circuit and transferred across the transformer isolation barrier, sup-pressing 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 (+ 24 VDC 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 SCM7B21

Block Diagram SCM7B21

PDF Downloads:

1 Module for Type SCM7B21:

SCM7B21 -10 to +10 V SCM7B21 Isolated Analog Voltage Input Module with Voltage-Output


  • Input: V-Signal
  • Output: 0 V to + 10 V
  • Bandwidth 300 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 100dB
  • True 2-way isolation
  • NMR: 80dB / Decade > 300 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