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SCM7B39

Process Current Output Modules, Bandwidth 100 Hz

The SCM7B39 process current modules accept high-level signals from the process control system and provide either 0 to 20 mA or 4 to 20 mA current to the field.

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, and the other four poles are on the field side.

After the initial process control system side filtering, the 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, filtered, and converted to a process current for output to the field.

Modules accept a wide 18 - 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 SCM7B39

Block Diagram SCM7B39



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4 Modules for Type SCM7B39:

ModuleInputDescription
SCM7B39-01 +1 to +5 V SCM7B39 Isolated Process Current Output Module with Voltage- or Current-Input
SCM7B39-02 0 to +10 V SCM7B39 Isolated Process Current Output Module with Voltage- or Current-Input
SCM7B39-03 0 to +10 V SCM7B39 Isolated Process Current Output Module with Voltage- or Current-Input
SCM7B39-04 4 to 20 mA SCM7B39 Isolated Process Current Output Module with Voltage- or Current-Input

Specifications

top
  • Input: mA- or V-Signal
  • Output: 0 … 20 mA / 4 … 20 mA
  • Bandwidth 100 Hz
  • Isolation 1500 Vrms
  • Input protection ± 35 Vpeak
  • Input Resistance 10 MOhm
  • Accuracy ± 0.03% (typ.), ± 0.1% (max.)
  • Linearity ± 0.01% (typ.), ± 0.02% (max.)
  • ANSI/IEEE C37.90.1 Input protection
  • CMR 110dB
  • True 2-way isolation
  • NMR: 80dB / Decade > 100 Hz
  • Power Supply 18 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