SCMD-MIDC24: Isolated Miniature Digital Input Module

Isolated Miniature Digital Input Module

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SCMD digital input modules provide highly reliable and safe interfaces to harsh industrial measurement and control applications. With SCMD modules installed near individual field signals, a reliable isolation barrier is provided between the field wiring computer system. Other benefits include reduction of field wiring costs and establishment of a cost effective and manageable method for system expansion and repair.

The SCMD-MIAC digital input modules are used for sensing ON/OFF AC or DC voltage levels in the ranges of 18-36, 90-140 and 180-280VAC or VDC respectively. They are protected from damage due to high-voltage transients on the input signal.

The SCMD-MIDC digital input modules provide DC voltage sensing at the lower ranges of 3.3 to 32VDC and 10 to 60VDC.

High voltage, low voltage, fast switching, and low noise options are available, designated by suffixes "A", "E", "F", and "N" respectively.

Five backpanels are available for mounting SCMD-M digital input modules.


  • Plug into Backpanels for Miniature or Full-Sized Modules
  • AC Inputs for 24V, 120V, 240V
  • DC Inputs for 3.3 to 32V, 10 to 60V
  • UL Listed, CSA Certified, CE Compliant
  • 4kV Optical Isolation
  • Open-Collector Output
  • Industry-Standard Pinout and Footprint
  • Operating Temperature -30 to +80°C

Block Diagram


Frequently Asked Questions

Can SCM5B modules be hot swapped?
Not just SCM5B modules, but any signal conditioning module series and MAQ20 I/O modules can be hot swapped. A minimal amount of signal settling time may result, but there will be no damage to the device.

Can Dataforth provide calibration reports for modules I purchased?
Yes we can provide calibration reports for the modules that you purchased.

You can either
a) visit to search for Test Report Datasheets by Serial Number or
b) you can send us a list of model numbers and their serial numbers to

In the SCMD-MIDC5 manual, the maximum output voltage is 30V; if +Vcc is only 5V, how could output voltage be 30V and logic voltage 6V?
Nominal Logic Voltage (Vcc) is the module power supply voltage and is +5V. Maximum Logic Voltage is +6V. The output voltage is from an external power supply and there fore can be higher than the module Logic Voltage and is specified at a maximum of 30V.


How does the load resistance of a module affect the noise at the output?
Noise at the output of a module is independent of load resistance.

If the input range of my signal conditioner is -1V to +1V and the output range is 0 to 10V, does this mean that it ignores polarity?
A signal conditioner with these I/O ranges does not mean that the module ignores the polarity of your voltage input. The output of voltage input modules are scaled linearly, meaning an input of -1V would correspond to an output of 0V, an input of 0V would correspond to an output of 5V, an input of +1V would correspond to an output of 10V, and so on.

How do I convert an RMS voltage to its corresponding peak voltage?
To convert an RMS voltage to its corresponding peak voltage, you simply take the RMS voltage value and multiply it by the square root of 2, or roughly 1.414.

For example, 1500Vrms corresponds to a peak voltage of 1500 * 1.414 = 2121 Vp

Due to resource constraints on my computer, I'm unable to open the three dimensional CAD models provided on your website. Does Dataforth provide two demensional CAD models for download as well?
Two dimensional CAD models can be generated upon customer request. Please contact Customer Service for assistance.
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