Isolated Digital I/O Modules

SCMD Series

SCMD Series Product Family


Series Datasheet Description
Isolated Digital I/O Modules
Miniature Digital Input Modules
Miniature Digital Output Modules
Miniature Digital Relay Output Modules
Accessories, backpanels, and module dimensions
SCMD Module Dimensions

Backpanels & Accessories

Part Number Datasheet Description
8 Channel Backpanel, Miniature
16 Channel Backpanel, Miniature
24 Channel Backpanel, Miniature
Board Jumper, Miniature
8 Ch Backpanel, Miniature, DIN Mount
16 Ch Backpanel, Miniature, DIN Mount
16 Ch Backpanel, Miniature with Term Block Output, DIN Mount
24 Ch Backpanel, Miniature, DIN Mount
16 Ch Backpanel, Miniature with Term Block Output
4-Ch Backpanel, Full Size & Miniature
4-Ch Backpanel, Full Size & Miniature, DIN Rail Mount

Isolated SCMD Digital I/O Modules

Dataforth offers a broad line of digital input and output modules and accessories providing safe, reliable interfacing to industrial measurement and control applications. Installed near individual field loads, SCMD modules create a rugged protective isolation barrier, effective to 4kV, between the field and computer system.

Use of these modules can also reduce field wiring costs while establishing an economical, manageable approach for system expansion and repair.

The SCMD Series

SCMD miniature digital I/O modules are solid-state devices which send ON and OFF electrical signals to and from a computer.
  • Input modules convert AC or DC voltages to DC logic signals and send them to the computer system
  • Output modules work in the opposite direction, switching either AC or DC circuits on or off in response to logic-level voltage commands from the computer
SCMD modules are available in miniature versions of four basic types: AC input, DC input, AC output, and DC output.

SCMD-MIAC and -MIDC
  • Miniature input modules used for sensing ON and OFF AC or DC voltage levels in the ranges 10-60, 90-140, and 180-280VAC and 3.3-32 and 10-60VDC
  • Low noise, fast switching, and other special features are available
SCMD-MOAC and -MODC
  • Miniature output modules accept 5VDC or 24VDC inputs and provide several different output ranges, including 12/24 to 140/280VAC and 0/3/5 to 50/60/200VDC
  • Fast switching and other special options are available
SCMD-MORO and -MORC
  • Miniature relay output modules used for switching AC and DC loads up to 125Vrms or 100VDC at maximum 30WDC or 62.5VA

Applications

Input Modules
Interface to:
  • Proximity Switches
  • Limit Switches
  • Photoelectric Switches
  • TTL Devices
  • Pushbuttons
Output Modules
Switch AC and DC loads in:
  • Relays
  • Motor Starters
  • Solenoids
  • Indicator Lamps

Features

  • 4000Vrms Optical Isolation
  • Industry Standard Packaging
  • Input Modules Incorporate Input Filtering for Transient-Free Switching
  • Complete Selection of Backpanels and Accessories
  • Optional Low Noise, Fast Switching Models
  • UL Listed, CSA Certified, CE Compliant
  • Manufactured per RoHS Directive 2002/95/EC

Frequently Asked Questions


What is the function of backpanels for signals?
Think of the backpanel as a bidirectional signal transfer device whose direction is determined by the module in a particular channel.
For an input module, the signal is transferred from the field-side screw terminals to the system/power supply-side screw terminals or to a signal access ribbon cable header or D-sub connector.
For an output module it is just the reverse, the signal is transferred from the system/power supply-side screw terminals or from a signal access ribbon cable header or D-sub connector to the field-side screw terminals.

Keywords/Phrases: backpanel, 5B backpanel, 7B backpanel, 8B backpanel, SCMD backpanel

In DC Digital Output Modules, does Dataforth have any with Iout > 3A?
Yes, Dataforth has the SCMD-MODC5ML which can switch up to 5A DC from an off-state voltage up to 50VDC.

The basic data sheet can be found in the Dataforth Full-Line Catalog under SCMD–MOAC/MODC Miniature Digital Output Modules and at www.dataforth.com at the upper left, under Explore our product offerings:, click on Signal Conditioning. Then click on Isolated Digital I/O Modules. In the top center of the next page, click on the Adobe Acrobat symbol to the right of SCMD–MOAC/MODC. At the right edge of the page in a text box labeled Datasheet, click on SCMD Specifications for detailed specifications of all Digital I/O Modules.

Keywords/Phrases: SCMD, SCMD–MOAC/MODC, SCMD-MODC, -MODC, Digital Output Modules, current, high, 3A, 5A

For SCMD-PB Digital I/O Backpanels, does Dataforth sell edge card connectors?
Dataforth does not sell the edge card connectors for the Digital I/O Backpanels, SCMD-PBxxxx. We do offer information about the part numbers and manufacturers of the connectors in the following lines.

Part Number Manufacturer
66317-150 FCI-Berg
3415-0001 3M

This information can also be found in the Dataforth Full-Line Catalog under SCMD Accessories Digital I/O Module Backpanels and at www.dataforth.com at the upper left under Explore our product offerings:, click on Signal Conditioning. Then click on Isolated Digital I/O Modules. In the top center of the next page, click on the Adobe Acrobat symbol to the right of Accessories.

Keywords/Phrases: SCMD, SCMD-PB, -PB

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.

Keywords/Phrases: SCMD, MIDC, MIDC5, SCMD-MIDC, SCMD-MIDC5