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Voltage Input Modules with Voltage-Output, Bandwidth 400 Hz

SCM7B22 voltage output modules accept input signals in the ± 10 V range from the process control system. The signal is isolated, buffered, and filtered to provide a unity gain field voltage output.

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 process control system side of the isolation barrier; four are on the field side.

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

Modules accept a wide 19 - 29 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 SCM7B22

Block Diagram SCM7B22

PDF Downloads:

1 Module for Type SCM7B22:

SCM7B22 -10 to +10 V SCM7B22 Isolated Bipolar Voltage Output Module with Voltage-Input


  • Input: V-Signal
  • Output: -10 V to +10 V
  • Bandwidth 400 Hz
  • Isolation 1500 Vrms
  • Input protection ± 35 VDC
  • 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 > 400 Hz
  • Power Supply 19 to 29 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